// Cross Join
private void AppendCrossJoin(ISqlBuilder jf, DbExpression dbExpression)
{
if (!usedKeyword)
{
jf.AppendNewLine();
jf.Append(_keywordName);
usedKeyword = true;
}
else
{
jf.Append(',');
jf.AppendNewLine();
jf.Append(_pad);
}
LambdaExpression lambda = dbExpression.Expressions[1] as LambdaExpression;
Type type = lambda.Parameters[1].Type;
var typeRuntime = TypeRuntimeInfoCache.GetRuntimeInfo(type);
jf.AppendTable(typeRuntime.TableSchema, typeRuntime.TableName, typeRuntime.IsTemporary);
string alias = _ag.GetTableAlias(lambda.Parameters[1]);
jf.Append(' ');
jf.Append(alias);
}
/// <summary>
/// 创建 DELETE 命令
/// </summary>
/// <param name="tree">查询语义</param>
/// <param name="context">解析SQL命令上下文</param>
/// <returns></returns>
protected override DbRawCommand TranslateDeleteCommand <T>(DbQueryDeleteTree tree, ITranslateContext context)
{
ISqlBuilder builder = this.CreateSqlBuilder(context);
var typeRuntime = TypeRuntimeInfoCache.GetRuntimeInfo <T>();
builder.Append("DELETE FROM ");
builder.AppendTable(typeRuntime.TableSchema, typeRuntime.TableName, typeRuntime.IsTemporary);
builder.Append(" t0 ");
if (tree.Entity != null)
{
if (typeRuntime.KeyMembers == null || typeRuntime.KeyMembers.Count == 0)
{
throw new XFrameworkException("Delete<T>(T value) require entity must have key column.");
}
object entity = tree.Entity;
builder.AppendNewLine();
builder.Append("WHERE ");
foreach (FieldAccessorBase m in typeRuntime.KeyMembers)
{
var value = m.Invoke(entity);
var sqlExpression = this.Constor.GetSqlValue(value, context, m.Column);
builder.AppendMember("t0", m.Member, typeRuntime.Type);
builder.Append(" = ");
builder.Append(sqlExpression);
builder.Append(" AND ");
}
builder.Length -= 5;
}
else if (tree.Select != null)
{
AliasGenerator ag = this.PrepareTableAlias(tree.Select, context.AliasPrefix);
var cmd = new NpgDbSelectCommand(context, ag, DbExpressionType.Delete, tree.Select.SelectHasMany);
if (tree.Select.Joins != null)
{
var visitor = new NpgJoinExpressionVisitor(ag, cmd.JoinFragment, DbExpressionType.Delete, cmd);
visitor.Visit(tree.Select.Joins);
}
if (tree.Select.Wheres != null)
{
var visitor = new NpgWhereExpressionVisitor(ag, cmd.WhereFragment);
visitor.Visit(tree.Select.Wheres);
cmd.AddNavMembers(visitor.NavMembers);
}
builder.Append(cmd.CommandText);
}
builder.Append(';');
return(new DbRawCommand(builder.ToString(), builder.TranslateContext != null ? builder.TranslateContext.Parameters : null, System.Data.CommandType.Text));
}
/// <summary>
/// 访问 IDbQueryable.Contains 方法
/// </summary>
/// <param name="m">字段或属性表达式</param>
protected override Expression VisitQueryableContains(MethodCallExpression m)
{
ITranslateContext context = _builder.TranslateContext;
DbQueryable subquery = m.Arguments[0].Evaluate().Value as DbQueryable;
subquery.Parameterized = _builder.Parameterized;
// 可能会有几级嵌套，这里用 Builder.Ident 标记是第几层级
string[] subs = new[] { "p", "u", "v", "w", "x" };
var newContext = context != null?TranslateContext.Copy(context, subs[_builder.Indent]) : null;
bool isDelete = context != null && ((SQLiteTranslateContext)context).IsDelete;
var cmd = subquery.Translate(_builder.Indent + 1, false, newContext) as DbSelectCommand;
if (this.NotOperands != null && this.NotOperands.Contains(m))
{
_builder.Append("NOT ");
}
_builder.Append("EXISTS(");
_builder.Append(cmd.CommandText);
if (((DbSelectCommand)cmd).WhereFragment.Length > 0)
{
_builder.Append(" AND ");
}
else
{
_builder.Append("WHERE ");
}
_builder.Append(cmd.SelectedColumnText);
_builder.Append(" = ");
// exists 不能用别名
if (isDelete)
{
var typeRuntime = TypeRuntimeInfoCache.GetRuntimeInfo(((MemberExpression)m.Arguments[1]).Expression.Type);
_builder.AppendTable(typeRuntime.TableSchema, typeRuntime.TableName, typeRuntime.IsTemporary);
_builder.Append('.');
}
_visitor.Visit(m.Arguments[1]);
_builder.Append(")");
return(m);
}
/// <summary>
/// 访问参数列表
/// </summary>
/// <param name="expression">将访问的表达式</param>
/// <param name="isFilter">是否过滤条件</param>
internal void VisitArgument(Expression expression, bool isFilter = false)
{
ITranslateContext context = _builder.TranslateContext;
_tree.Select.Select = new DbExpression(DbExpressionType.Select, expression);
// 可能会有几级嵌套，这里用 Builder.Ident 标记是第几层级
string[] subs = new[] { "p", "u", "v", "w", "x" };
var newContext = context != null?TranslateContext.Copy(context, subs[_builder.Indent]) : null;
var cmd = Translator.Invoke(_tree.Select, _builder.Indent + 1, false, newContext) as DbSelectCommand;
_builder.Append('(');
_builder.Append(cmd.CommandText.Trim());
if (((DbSelectCommand)cmd).WhereFragment.Length > 0)
{
_builder.Append(" AND ");
}
else
{
_builder.Append("WHERE ");
}
var typeRuntime = TypeRuntimeInfoCache.GetRuntimeInfo(_tree.Entity != null ? _tree.Entity.GetType() : _tree.Select.From);
foreach (var m in typeRuntime.KeyMembers)
{
_builder.AppendMember(string.Format("{0}0", subs[_builder.Indent]), m.Member, typeRuntime.Type);
_builder.Append(" = ");
_builder.AppendTable(typeRuntime.TableSchema, typeRuntime.TableName, typeRuntime.IsTemporary);
_builder.Append('.');
_builder.AppendMember(null, m.Member, typeRuntime.Type);
_builder.Append(" AND ");
}
_builder.Length -= 5;
_builder.Append(')');
}
/// <summary>
/// 创建 INSERT 命令
/// </summary>
/// <param name="tree">查询语义</param>
/// <param name="context">解析SQL命令上下文</param>
/// <returns></returns>
protected override DbRawCommand TranslateInsertCommand <T>(DbQueryInsertTree tree, ITranslateContext context)
{
ISqlBuilder builder = this.CreateSqlBuilder(context);
var typeRuntime = TypeRuntimeInfoCache.GetRuntimeInfo <T>();
if (tree.Entity != null)
{
object entity = tree.Entity;
ISqlBuilder columnsBuilder = this.CreateSqlBuilder(context);
ISqlBuilder valuesBuilder = this.CreateSqlBuilder(context);
// 指定插入列
var members = typeRuntime.Members;
if (tree.EntityColumns != null && tree.EntityColumns.Count > 0)
{
members = new MemberAccessorCollection();
for (int i = 0; i < tree.EntityColumns.Count; i++)
{
Expression curExpr = tree.EntityColumns[i];
if (curExpr.NodeType == ExpressionType.Lambda)
{
curExpr = (curExpr as LambdaExpression).Body.ReduceUnary();
}
if (curExpr.NodeType != ExpressionType.MemberAccess)
{
throw new XFrameworkException("Can't read field name from expression {0}", tree.EntityColumns[i]);
}
MemberExpression member = curExpr as MemberExpression;
string name = member.Member.Name;
members[name] = typeRuntime.Members[name];
}
}
foreach (var item in members)
{
var m = item as FieldAccessorBase;
if (m == null || !m.IsDbField)
{
continue;
}
if (m != typeRuntime.Identity)
{
columnsBuilder.AppendMember(null, m.Member, typeRuntime.Type);
columnsBuilder.Append(',');
var value = m.Invoke(entity);
string sqlExpression = this.Constor.GetSqlValueWidthDefault(value, context, m.Column);
valuesBuilder.Append(sqlExpression);
valuesBuilder.Append(',');
}
}
columnsBuilder.Length -= 1;
valuesBuilder.Length -= 1;
if (tree.Bulk == null || !tree.Bulk.OnlyValue)
{
builder.Append("INSERT INTO ");
builder.AppendTable(typeRuntime.TableSchema, typeRuntime.TableName, typeRuntime.IsTemporary);
builder.Append('(');
builder.Append(columnsBuilder);
builder.Append(')');
builder.AppendNewLine();
builder.AppendTab();
builder.Append("VALUES");
}
builder.Append('(');
builder.Append(valuesBuilder);
builder.Append(')');
if (tree.Bulk != null && !tree.Bulk.IsEndPos)
{
builder.Append(",");
}
if (tree.Bulk == null && typeRuntime.Identity != null)
{
builder.Append(';');
builder.AppendNewLine();
builder.Append("SELECT LAST_INSERT_ID()");
builder.AppendAs(AppConst.AUTO_INCREMENT_NAME);
}
}
else if (tree.Select != null)
{
builder.Append("INSERT INTO ");
builder.AppendTable(typeRuntime.TableSchema, typeRuntime.TableName, typeRuntime.IsTemporary);
builder.Append('(');
var srcExpressionType = context.CurrentExpressionType;
var srcIsOutermost = context.CurrentIsOutermost;
context.CurrentExpressionType = DbExpressionType.Insert;
context.CurrentIsOutermost = true;
var cmd = this.TranslateSelectCommandImpl(tree.Select, 0, true, context) as DbSelectCommand;
context.CurrentExpressionType = srcExpressionType;
context.CurrentIsOutermost = srcIsOutermost;
int index = 0;
foreach (var column in cmd.SelectedColumns)
{
builder.AppendMember(column.NewName);
if (index < cmd.SelectedColumns.Count - 1)
{
builder.Append(',');
}
index++;
}
builder.Append(')');
builder.AppendNewLine();
builder.Append(cmd.CommandText);
}
if (tree.Bulk == null || tree.Bulk.IsEndPos)
{
builder.Append(';');
}
return(new DbRawCommand(builder.ToString(), builder.TranslateContext != null ? builder.TranslateContext.Parameters : null, System.Data.CommandType.Text));
}
// 解译 SELECT 语句
private DbRawCommand TranslateSelectCommandImpl(DbQuerySelectTree tree, int indent, bool isOutermost, ITranslateContext context)
{
// 说明：
// 1.OFFSET 前必须要有 'ORDER BY'，即 'Skip' 子句前必须使用 'OrderBy' 子句
// 2.在有聚合函数的<MAX,MIN...>情况下，如果有 'Distinct' 'GroupBy' 'Skip' 'Take' 子句，则需要使用嵌套查询
// 3.'Any' 子句将翻译成 IF EXISTS...
// 4.分组再分页时需要使用嵌套查询，此时子查询不需要 'OrderBy' 子句，但最外层则需要
// 5.'Skip' 'Take' 子句视为语义结束符，在其之后的子句将使用嵌套查询
// 6.导航属性中有 1:n 关系的，需要使用嵌套查询，否则分页查询会有问题
// 8.如果只有 Skip 没有 Take，则使用 Row_Number() Over()分页语法，其它使用 LIMIT ## OFFSET 语法
// 导航属性中有1:n关系，只统计主表
// 例：AccountList = a.Client.AccountList,
var subquery = tree.Subquery as DbQuerySelectTree;
if (tree.SelectHasMany && subquery != null && subquery.Aggregate != null)
{
tree = subquery;
}
var srcDbExpressionType = context.CurrentExpressionType;
var srcIsOutmost = context.CurrentIsOutermost;
if (srcDbExpressionType == null)
{
context.CurrentExpressionType = DbExpressionType.Select;
}
if (srcIsOutmost == null || !isOutermost)
{
context.CurrentIsOutermost = isOutermost;
}
bool useAggregate = tree.Aggregate != null;
// 没有聚合函数或者使用 'Skip' 子句，则解析OrderBy
// 导航属性如果使用嵌套，除非有 TOP 或者 OFFSET 子句，否则不能用ORDER BY
// 第一层的表别名
string alias = context != null && !string.IsNullOrEmpty(context.AliasPrefix) ? (context.AliasPrefix + "0") : "t0";
bool useSubquery = tree.HasDistinct || tree.GroupBy != null || tree.Skip > 0 || tree.Take > 0;
bool useOrderBy = (!useAggregate || tree.Skip > 0) && !tree.HasAny && (!tree.SelectHasMany || (tree.Skip > 0 || tree.Take > 0));
AliasGenerator ag = this.PrepareTableAlias(tree, context != null ? context.AliasPrefix : null);
var result = new DbSelectCommand(context, ag, tree.SelectHasMany);
ISqlBuilder jf = result.JoinFragment;
ISqlBuilder wf = result.WhereFragment;
ISqlBuilder sf = null;
jf.Indent = indent;
#region 嵌套查询
if (useAggregate && useSubquery)
{
// SELECT
jf.Append("SELECT ");
jf.AppendNewLine();
// SELECT COUNT(1)
var visitor = new AggregateExpressionVisitor(ag, jf, tree.GroupBy, alias);
visitor.Visit(tree.Aggregate);
result.AddNavMembers(visitor.NavMembers);
// SELECT COUNT(1) FROM
jf.AppendNewLine();
jf.Append("FROM ( ");
indent += 1;
jf.Indent = indent;
context.CurrentIsOutermost = false;
}
#endregion
#region 择子句
// SELECT 子句
if (jf.Indent > 0)
{
jf.AppendNewLine();
}
jf.Append("SELECT ");
if (tree.HasAny)
{
jf.Append("CASE WHEN COUNT(1) = 1 THEN 1 ELSE 0 END FROM (");
indent += 1;
jf.Indent = indent;
jf.AppendNewLine();
jf.Append("SELECT 1 ");
}
if (useAggregate && !useSubquery)
{
// 如果有聚合函数，并且不是嵌套的话，则直接使用SELECT <MAX,MIN...>，不需要解析选择的字段
jf.AppendNewLine();
var visitor_ = new AggregateExpressionVisitor(ag, jf, tree.GroupBy, null);
visitor_.Visit(tree.Aggregate);
result.AddNavMembers(visitor_.NavMembers);
}
else
{
// DISTINCT 子句
if (tree.HasDistinct)
{
jf.Append("DISTINCT ");
}
#region 择字段
if (!tree.HasAny)
{
// SELECT 范围
ColumnExpressionVisitor visitor = null;
if (tree.Skip > 0 && tree.Take == 0)
{
sf = this.CreateSqlBuilder(context);
sf.Indent = jf.Indent + 1;
visitor = new ColumnExpressionVisitor(ag, sf, tree);
visitor.Visit(tree.Select);
}
else
{
visitor = new ColumnExpressionVisitor(ag, jf, tree);
visitor.Visit(tree.Select);
}
result.SelectedColumns = visitor.SelectedColumns;
result.SelectedColumnText = visitor.SelectedColumnText;
result.SelectedNavs = visitor.SelectedNavDescriptors;
result.AddNavMembers(visitor.NavMembers);
if (sf != null)
{
// 第一层嵌套
int index = 0;
jf.AppendNewLine();
foreach (var column in result.SelectedColumns)
{
jf.AppendMember(alias, column.Name);
jf.AppendAs(column.NewName);
index += 1;
if (index < result.SelectedColumns.Count)
{
jf.Append(',');
jf.AppendNewLine();
}
}
jf.AppendNewLine();
jf.Append("FROM(");
// 第二层嵌套
indent += 1;
jf.Indent = indent;
jf.AppendNewLine();
jf.Append("SELECT");
jf.Append(sf);
jf.Append(',');
jf.AppendNewLine();
if (tree.OrderBys == null || tree.OrderBys.Count == 0)
{
throw new XFrameworkException("The method 'OrderBy' must be called before 'Skip'.");
}
jf.Append("ROW_NUMBER() OVER(");
var visitor3 = new OrderByExpressionVisitor(ag, jf, tree.GroupBy, null);
visitor3.Visit(tree.OrderBys, false);
result.AddNavMembers(visitor3.NavMembers);
jf.Append(") Row_Number0");
}
}
#endregion
}
#endregion
#region 顺序解析
// FROM 子句
jf.AppendNewLine();
jf.Append("FROM ");
if (tree.Subquery != null)
{
// 子查询
jf.Append("(");
var cmd = this.TranslateSelectCommandImpl(tree.Subquery, indent + 1, false, context);
jf.Append(cmd.CommandText);
jf.AppendNewLine();
jf.Append(") ");
jf.Append(alias);
jf.Append(' ');
}
else if (tree.FromSql != null)
{
if (tree.FromSql.DbContext == null)
{
tree.FromSql.DbContext = context.DbContext;
}
DbRawSql rawSql = tree.FromSql;
// 解析参数
object[] args = null;
if (rawSql.Parameters != null)
{
args = rawSql.Parameters.Select(x => this.Constor.GetSqlValue(x, context)).ToArray();
}
string sql = rawSql.CommandText;
if (args != null && args.Length > 0)
{
sql = string.Format(sql, args);
}
// 子查询
jf.Append('(');
var cmd = new DbRawCommand(sql, context.Parameters, CommandType.Text);
jf.Append(cmd.CommandText);
jf.AppendNewLine();
jf.Append(") ");
jf.Append(alias);
jf.Append(' ');
}
else
{
var typeRuntime = TypeRuntimeInfoCache.GetRuntimeInfo(tree.From);
jf.AppendTable(typeRuntime.TableSchema, typeRuntime.TableName, typeRuntime.IsTemporary);
jf.Append(' ');
jf.Append(alias);
jf.Append(' ');
}
// LEFT<INNER> JOIN 子句
if (tree.Joins != null)
{
var visitor = new JoinExpressionVisitor(ag, jf);
visitor.Visit(tree.Joins);
}
wf.Indent = jf.Indent;
// WHERE 子句
if (tree.Wheres != null)
{
var visitor = new WhereExpressionVisitor(ag, wf);
visitor.Visit(tree.Wheres);
result.AddNavMembers(visitor.NavMembers);
}
// GROUP BY 子句
if (tree.GroupBy != null)
{
var visitor = new GroupByExpressionVisitor(ag, wf);
visitor.Visit(tree.GroupBy);
result.AddNavMembers(visitor.NavMembers);
}
// HAVING 子句
if (tree.Havings != null)
{
var visitor = new HavingExpressionVisitor(ag, wf, tree.GroupBy);
visitor.Visit(tree.Havings);
result.AddNavMembers(visitor.NavMembers);
}
// ORDER 子句
if (tree.OrderBys != null && tree.OrderBys.Count > 0 && useOrderBy)// && !groupByPaging)
{
var visitor = new OrderByExpressionVisitor(ag, wf, tree.GroupBy, null);
visitor.Visit(tree.OrderBys);
result.AddNavMembers(visitor.NavMembers);
}
#endregion
#region 分页查询
// LIMIT 子句可以被用于强制 SELECT 语句返回指定的记录数。
// LIMIT 接受一个或两个数字参数。参数必须是一个整数常量。如果给定两个参数，第一个参数指定第一个返回记录行的偏移量，第二个参数指定返回记录行的最大数目。
// 初始记录行的偏移量是 0(而不是 1)： 为了与 PostgreSQL 兼容，MySQL 也支持句法： LIMIT # OFFSET #。
// Limit n,-1 语法不支持，使用ROW_Number()语法代替
if (tree.Take > 0)
{
wf.AppendNewLine().AppendFormat("LIMIT {0}", this.Constor.GetSqlValue(tree.Take, context));
wf.AppendFormat(" OFFSET {0}", this.Constor.GetSqlValue(tree.Skip, context));
}
#endregion
#region 嵌套查询
if (useAggregate && useSubquery)
{
result.CombineFragments();
indent -= 1;
jf.Indent = indent;
jf.AppendNewLine();
jf.Append(") ");
jf.Append(alias);
}
#endregion
#region 嵌套导航
// TODO Include 从表，没分页，OrderBy 报错
//if (tree.HasMany && subquery != null && subquery.OrderBys.Count > 0 && subquery.Aggregate == null && !(subquery.Skip > 0 || subquery.Take > 0))
if (tree.SelectHasMany && subquery.Aggregate == null &&
subquery != null && subquery.OrderBys != null && subquery.OrderBys.Count > 0 && !(subquery.Skip > 0 || subquery.Take > 0))
{
result.CombineFragments();
var visitor = new OrderByExpressionVisitor(ag, jf, null, null);
visitor.Visit(subquery.OrderBys);
}
#endregion
#region 并集查询
// UNION 子句
if (tree.Unions != null && tree.Unions.Count > 0)
{
result.CombineFragments();
for (int index = 0; index < tree.Unions.Count; index++)
{
jf.AppendNewLine();
jf.Append("UNION ALL");
if (indent == 0)
{
jf.AppendNewLine();
}
DbRawCommand cmd = this.TranslateSelectCommandImpl(tree.Unions[index], indent, isOutermost, context);
jf.Append(cmd.CommandText);
}
}
#endregion
#region 分页查询
if (sf != null)
{
// 合并 WHERE
result.CombineFragments();
indent -= 1;
jf.Indent = indent;
jf.AppendNewLine();
jf.Append(") ");
jf.Append(alias);
jf.AppendNewLine();
jf.Append("WHERE ");
if (tree.Skip > 0)
{
jf.AppendMember(alias, "Row_Number0");
jf.Append(" > ");
jf.Append(this.Constor.GetSqlValue(tree.Skip, context));
}
}
#endregion
#region Any 子句
// 'Any' 子句
if (tree.HasAny)
{
// 产生 WHERE 子句
result.CombineFragments();
// 如果没有分页，则显式指定只查一笔记录
if (tree.Take == 0 && tree.Skip == 0)
{
jf.AppendNewLine();
jf.Append("LIMIT 0,1");
}
indent -= 1;
jf.Indent = indent;
jf.AppendNewLine();
jf.Append(") ");
jf.Append(alias);
}
#endregion
#region 还原状态
context.CurrentExpressionType = srcDbExpressionType;
context.CurrentIsOutermost = srcIsOutmost;
#endregion
return(result);
}
/// <summary>
/// 添加导航属性关联
/// </summary>
protected override void TanslateNavMember()
{
if (base.NavMembers == null || base.NavMembers.Count == 0)
{
return;
}
// 如果有一对多的导航属性，肯定会产生嵌套查询。那么内层查询别名肯定是t0，所以需要清掉
if (this.HasMany)
{
_ag = new AliasGenerator(_ag.ReserveQty);
}
//开始产生LEFT JOIN 子句
ISqlBuilder builder = this.JoinFragment;
foreach (var nav in base.NavMembers)
{
string key = nav.Key;
MemberExpression m = nav.Expression;
TypeRuntimeInfo typeRuntime = TypeRuntimeInfoCache.GetRuntimeInfo(m.Expression.Type);
ForeignKeyAttribute attribute = typeRuntime.GetMemberAttribute <ForeignKeyAttribute>(m.Member.Name);
string innerKey = string.Empty;
string outerKey = key;
string innerAlias = string.Empty;
if (!m.Expression.Visitable())
{
innerKey = m.Expression.NodeType == ExpressionType.Parameter
? (m.Expression as ParameterExpression).Name
: (m.Expression as MemberExpression).Member.Name;
}
else
{
MemberExpression mLeft = null;
if (m.Expression.NodeType == ExpressionType.MemberAccess)
{
mLeft = m.Expression as MemberExpression;
}
else if (m.Expression.NodeType == ExpressionType.Call)
{
mLeft = (m.Expression as MethodCallExpression).Object as MemberExpression;
}
string name = TypeRuntimeInfoCache.GetRuntimeInfo(mLeft.Type).TableFullName;
innerAlias = _ag.GetJoinTableAlias(name);
if (string.IsNullOrEmpty(innerAlias))
{
string keyLeft = mLeft.GetKeyWidthoutAnonymous();
if (base.NavMembers.Contains(keyLeft))
{
innerKey = keyLeft;
}
innerAlias = _ag.GetNavTableAlias(innerKey);
}
}
string alias1 = !string.IsNullOrEmpty(innerAlias) ? innerAlias : _ag.GetTableAlias(innerKey);
string alias2 = _ag.GetNavTableAlias(outerKey);
builder.AppendNewLine();
builder.Append("LEFT JOIN ");
Type type = m.Type;
if (type.IsGenericType)
{
type = type.GetGenericArguments()[0];
}
var typeRuntime2 = TypeRuntimeInfoCache.GetRuntimeInfo(type);
builder.AppendTable(typeRuntime2.TableSchema, typeRuntime2.TableFullName, typeRuntime2.IsTemporary);
builder.Append(" ");
builder.Append(alias2);
bool withNoLock = !typeRuntime2.IsTemporary && _isNoLock && !string.IsNullOrEmpty(_withNoLock);
if (withNoLock)
{
builder.Append(' ');
builder.Append(_withNoLock);
}
builder.Append(" ON ");
for (int i = 0; i < attribute.InnerKeys.Length; i++)
{
if (attribute.InnerKeys[i].StartsWith(AppConst.CONSTANT_FOREIGNKEY, StringComparison.Ordinal))
{
builder.Append(attribute.InnerKeys[i].Substring(7));
}
else
{
builder.Append(alias1);
builder.Append('.');
builder.AppendMember(attribute.InnerKeys[i]);
}
builder.Append(" = ");
if (attribute.OuterKeys[i].StartsWith(AppConst.CONSTANT_FOREIGNKEY, StringComparison.Ordinal))
{
builder.Append(attribute.OuterKeys[i].Substring(7));
}
else
{
builder.Append(alias2);
builder.Append('.');
builder.AppendMember(attribute.OuterKeys[i]);
}
if (i < attribute.InnerKeys.Length - 1)
{
builder.Append(" AND ");
}
}
if (nav.Predicate != null)
{
string alias = _ag.GetNavTableAlias(nav.Key);
var visitor = new NavPredicateExpressionVisitor(_ag, builder, alias);
visitor.Visit(nav.Predicate);
}
}
}
/// <summary>
/// 解析左关联
/// </summary>
protected virtual void AppendLfInJoin(DbExpression dbExpression)
{
_builder.Append(' ');
DbQueryable dbQueryable = (DbQueryable)((dbExpression.Expressions[0] as ConstantExpression).Value);
dbQueryable.Parameterized = _builder.Parameterized;
if (dbQueryable.DbExpressions.Count == 1 && dbQueryable.DbExpressions[0].DbExpressionType == DbExpressionType.GetTable)
{
// 区别 GetTable 有三个重载
var expressions = dbQueryable.DbExpressions[0].Expressions;
if (expressions.Length == 2 && ((expressions[0] as ConstantExpression).Value as string) != null)
{
string text = (expressions[0] as ConstantExpression).Value as string;
object[] @params = (expressions[1] as ConstantExpression).Value as object[];
var provider = ((DbQueryProvider)_builder.Provider);
var context = _builder.TranslateContext;
// 解析参数
object[] args = null;
if (@params != null)
{
args = @params.Select(x => provider.Constor.GetSqlValue(x, context)).ToArray();
}
string sql = text;
if (args != null && args.Length > 0)
{
sql = string.Format(sql, args);
}
var cmd = new DbRawCommand(sql, context.Parameters, CommandType.Text);
_builder.Append("(");
_builder.Append(cmd.CommandText);
_builder.AppendNewLine();
_builder.Append(')');
}
else
{
Type type = dbExpression.Expressions[0].Type.GetGenericArguments()[0];
var typeRuntime = TypeRuntimeInfoCache.GetRuntimeInfo(type);
_builder.AppendTable(typeRuntime.TableSchema, typeRuntime.TableName, typeRuntime.IsTemporary);
}
}
else
{
// 嵌套
var cmd = dbQueryable.Translate(_builder.Indent + 1, false, _builder.TranslateContext);
_builder.Append("(");
_builder.Append(cmd.CommandText);
_builder.AppendNewLine();
_builder.Append(')');
}
var left = dbExpression.Expressions[1] as LambdaExpression;
var right = dbExpression.Expressions[2] as LambdaExpression;
// t0(t1)
string alias = !(left.Body.NodeType == ExpressionType.New || left.Body.NodeType == ExpressionType.MemberInit)
? _ag.GetTableAlias(dbExpression.Expressions[2])
: _ag.GetTableAlias(right.Parameters[0]);
_builder.Append(' ');
_builder.Append(alias);
_builder.Append(' ');
// ON a.Name = b.Name AND a.Id = b.Id
_builder.Append("ON ");
if (left.Body.NodeType == ExpressionType.New)
{
var body1 = left.Body as NewExpression;
var body2 = right.Body as NewExpression;
for (int index = 0; index < body1.Arguments.Count; ++index)
{
base.Visit(body1.Arguments[index]);
_builder.Append(" = ");
base.Visit(body2.Arguments[index]);
if (index < body1.Arguments.Count - 1)
{
_builder.Append(" AND ");
}
}
}
else if (left.Body.NodeType == ExpressionType.MemberInit)
{
var body1 = left.Body as MemberInitExpression;
var body2 = right.Body as MemberInitExpression;
for (int index = 0; index < body1.Bindings.Count; ++index)
{
base.Visit((body1.Bindings[index] as MemberAssignment).Expression);
_builder.Append(" = ");
base.Visit((body2.Bindings[index] as MemberAssignment).Expression);
if (index < body1.Bindings.Count - 1)
{
_builder.Append(" AND ");
}
}
}
else
{
base.Visit(left.Body.ReduceUnary());
_builder.Append(" = ");
base.Visit(right.Body.ReduceUnary());
}
}
/// <summary>
/// 创建 UPDATE 命令
/// </summary>
/// <param name="tree">查询语义</param>
/// <param name="context">解析SQL命令上下文</param>
/// <returns></returns>
protected override DbRawCommand TranslateUpdateCommand <T>(DbQueryUpdateTree tree, ITranslateContext context)
{
ISqlBuilder builder = this.CreateSqlBuilder(context);
var typeRuntime = TypeRuntimeInfoCache.GetRuntimeInfo <T>();
builder.Append("UPDATE ");
builder.AppendTable(typeRuntime.TableSchema, typeRuntime.TableName, typeRuntime.IsTemporary);
builder.Append(" t0 SET");
builder.AppendNewLine();
if (tree.Entity != null)
{
object entity = tree.Entity;
ISqlBuilder whereBuilder = this.CreateSqlBuilder(context);
bool useKey = false;
int length = 0;
foreach (var item in typeRuntime.Members)
{
var m = item as FieldAccessorBase;
if (m == null || !m.IsDbField)
{
continue;
}
if (m.Column != null && m.Column.IsIdentity)
{
goto LABEL; // Fix issue# 自增列同时又是主键
}
builder.AppendMember(null, m.Member, typeRuntime.Type);
builder.Append(" = ");
LABEL:
if (m.Column == null || !m.Column.IsIdentity)
{
var value = m.Invoke(entity);
var sqlExpression = this.Constor.GetSqlValueWidthDefault(value, context, m.Column);
builder.Append(sqlExpression);
length = builder.Length;
builder.Append(',');
builder.AppendNewLine();
}
if (m.Column != null && m.Column.IsKey)
{
useKey = true;
}
}
if (!useKey)
{
throw new XFrameworkException("Update<T>(T value) require T must have key column.");
}
// ORACLE 需要注意参数顺序问题
int index = -1;
foreach (FieldAccessorBase m in typeRuntime.KeyMembers)
{
var column = m.Column;
var value = m.Invoke(entity);
var seg = this.Constor.GetSqlValueWidthDefault(value, context, column);
index += 1;
whereBuilder.AppendMember(null, m.Member, typeRuntime.Type);
whereBuilder.Append(" = ");
whereBuilder.Append(seg);
if (index < typeRuntime.KeyMembers.Count - 1)
{
whereBuilder.Append(" AND ");
}
}
builder.Length = length;
builder.AppendNewLine();
builder.Append("WHERE ");
builder.Append(whereBuilder);
}
else if (tree.Expression != null)
{
// SELECT 表达式
LambdaExpression lambda = tree.Expression as LambdaExpression;
var body = lambda.Body;
Expression expression = null;
if (body.NodeType == ExpressionType.MemberInit)
{
var initExpression = body as MemberInitExpression;
var bindings = new List <MemberBinding>(initExpression.Bindings);
foreach (var m in typeRuntime.KeyMembers)
{
var member = Expression.MakeMemberAccess(lambda.Parameters[0], m.Member);
var binding = Expression.Bind(m.Member, member);
if (!bindings.Any(x => x.Member == m.Member))
{
bindings.Add(binding);
}
}
expression = Expression.MemberInit(initExpression.NewExpression, bindings);
}
else if (body.NodeType == ExpressionType.New)
{
var newExpression = body as NewExpression;
var bindings = new List <MemberBinding>();
for (int index = 0; index < newExpression.Members.Count; index++)
{
var m = (FieldAccessorBase)typeRuntime.Members.FirstOrDefault(a => a is FieldAccessorBase && (
a.Name == newExpression.Members[index].Name ||
((FieldAccessorBase)a).Column != null && ((FieldAccessorBase)a).Column.Name == newExpression.Members[index].Name));
if (m == null)
{
throw new XFrameworkException("Member {0}.{1} not found.", typeRuntime.Type.Name, newExpression.Members[index].Name);
}
var binding = Expression.Bind(m.Member, newExpression.Arguments[index].Type != m.CLRType
? Expression.Convert(newExpression.Arguments[index], m.CLRType)
: newExpression.Arguments[index]);
bindings.Add(binding);
}
foreach (var m in typeRuntime.KeyMembers)
{
var member = Expression.MakeMemberAccess(lambda.Parameters[0], m.Member);
var binding = Expression.Bind(m.Member, member);
if (!bindings.Any(x => x.Member == m.Member))
{
bindings.Add(binding);
}
}
var newExpression2 = Expression.New(typeRuntime.Constructor.Member);
expression = Expression.MemberInit(newExpression2, bindings);
}
// 解析查询以确定是否需要嵌套
tree.Select.Select = new DbExpression(DbExpressionType.Select, expression);
var cmd = (DbSelectCommand)this.TranslateSelectCommand(tree.Select, 0, false, this.CreateTranslateContext(context.DbContext));
if ((cmd.NavMembers != null && cmd.NavMembers.Count > 0) || (tree.Select.Joins != null && tree.Select.Joins.Count > 0))
{
// 无法使用 DISTINCT, GROUP BY 等子句从视图中选择 ROWID 或采样。UPDATE 不能用rowid
// 有导航属性或者关联查询，使用 MERGE INTO 语法。要求必须有主键
if (typeRuntime.KeyMembers == null || typeRuntime.KeyMembers.Count == 0)
{
throw new XFrameworkException("Update<T>(Expression<Func<T, object>> updateExpression) require entity must have key column.");
}
builder.Length = 0;
builder.Append("MERGE INTO ");
builder.AppendTable(typeRuntime.TableSchema, typeRuntime.TableName, typeRuntime.IsTemporary);
builder.AppendNewLine(" t0");
builder.Append("USING (");
cmd = (DbSelectCommand)this.TranslateSelectCommand(tree.Select, 1, false, context);
builder.AppendNewLine(cmd.CommandText);
builder.Append(") t1 ON (");
foreach (var m in typeRuntime.KeyMembers)
{
builder.AppendMember("t0", m.Member, typeRuntime.Type);
builder.Append(" = ");
builder.AppendMember("t1", m.Member, typeRuntime.Type);
builder.Append(" AND ");
}
builder.Length -= 5;
builder.Append(')');
// UPDATE
builder.AppendNewLine();
builder.AppendNewLine("WHEN MATCHED THEN UPDATE SET ");
// SET 字段
var visitor = new OracleUpdateExpressionVisitor(null, builder);
visitor.Visit(tree.Expression);
}
else
{
// 直接 SQL 的 UPDATE 语法
DbExpressionVisitor visitor = null;
AliasGenerator ag = this.PrepareTableAlias(tree.Select, context.AliasPrefix);
visitor = new UpdateExpressionVisitor(ag, builder);
visitor.Visit(tree.Expression);
if (tree.Select.Wheres != null)
{
visitor = new WhereExpressionVisitor(ag, builder);
visitor.Visit(tree.Select.Wheres);
}
}
}
builder.Append(';');
return(new DbRawCommand(builder.ToString(), builder.TranslateContext != null ? builder.TranslateContext.Parameters : null, System.Data.CommandType.Text));
}
/// <summary>
/// 创建 DELETE 命令
/// </summary>
/// <param name="tree">查询语义</param>
/// <param name="context">解析SQL命令上下文</param>
/// <returns></returns>
protected override DbRawCommand TranslateDeleteCommand <T>(DbQueryDeleteTree tree, ITranslateContext context)
{
ISqlBuilder builder = this.CreateSqlBuilder(context);
var typeRuntime = TypeRuntimeInfoCache.GetRuntimeInfo <T>();
builder.Append("DELETE FROM ");
builder.AppendTable(typeRuntime.TableSchema, typeRuntime.TableName, typeRuntime.IsTemporary);
builder.Append(" t0 ");
if (tree.Entity != null)
{
if (typeRuntime.KeyMembers == null || typeRuntime.KeyMembers.Count == 0)
{
throw new XFrameworkException("Delete<T>(T value) require entity must have key column.");
}
object entity = tree.Entity;
builder.AppendNewLine();
builder.Append("WHERE ");
foreach (FieldAccessorBase m in typeRuntime.KeyMembers)
{
var value = m.Invoke(entity);
var sqlExpression = this.Constor.GetSqlValue(value, context, m.Column);
builder.AppendMember("t0", m.Member, typeRuntime.Type);
builder.Append(" = ");
builder.Append(sqlExpression);
builder.Append(" AND ");
}
builder.Length -= 5;
}
else if (tree.Select != null)
{
// 解析查询用来确定是否需要嵌套
var cmd = this.TranslateSelectCommand(tree.Select, 0, false, this.CreateTranslateContext(context.DbContext)) as DbSelectCommand;
if ((cmd.NavMembers != null && cmd.NavMembers.Count > 0) || (tree.Select.Joins != null && tree.Select.Joins.Count > 0))
{
// 最外层仅选择 RowID 列
var outQuery = tree.Select;
outQuery.Select = new DbExpression(DbExpressionType.Select, Expression.Constant("t0.RowId", typeof(string)));
var iterator = outQuery;
while (iterator.Subquery != null)
{
var subquery = new OracleDbQuerySelectTree(iterator.Subquery);
iterator.Subquery = subquery;
iterator = subquery;
}
// 解析成 RowId IN 结构
cmd = (DbSelectCommand)this.TranslateSelectCommand(tree.Select, 1, false, context);
builder.Append("WHERE t0.RowId IN(");
builder.AppendNewLine(cmd.CommandText);
builder.Append(')');
}
else
{
AliasGenerator ag = this.PrepareTableAlias(tree.Select, context.AliasPrefix);
if (tree.Select.Joins != null)
{
var visitor = new JoinExpressionVisitor(ag, builder);
visitor.Visit(tree.Select.Joins);
}
if (tree.Select.Wheres != null)
{
var visitor = new WhereExpressionVisitor(ag, builder);
visitor.Visit(tree.Select.Wheres);
}
}
}
builder.Append(';');
return(new DbRawCommand(builder.ToString(), builder.TranslateContext != null ? builder.TranslateContext.Parameters : null, System.Data.CommandType.Text));
}
/// <summary>
/// 解析 SELECT 命令
/// </summary>
/// <param name="tree">查询语义</param>
/// <param name="indent">缩进</param>
/// <param name="isOutermost">是否外层查询，内层查询不需要结束符(;)</param>
/// <param name="context">解析上下文</param>
/// <returns></returns>
protected override DbRawCommand TranslateSelectCommand(DbQuerySelectTree tree, int indent, bool isOutermost, ITranslateContext context)
{
// 说明：
// 1.OFFSET 前必须要有 'ORDER BY'，即 'Skip' 子句前必须使用 'OrderBy' 子句
// 2.在有聚合函数的<MAX,MIN...>情况下，如果有 'Distinct' 'GroupBy' 'Skip' 'Take' 子句，则需要使用嵌套查询
// 3.'Any' 子句将翻译成 IF EXISTS...
// 4.分组再分页时需要使用嵌套查询，此时子查询不需要 'OrderBy' 子句，但最外层则需要
// 5.'Skip' 'Take' 子句视为语义结束符，在其之后的子句将使用嵌套查询
// 6.导航属性中有 1:n 关系的，需要使用嵌套查询，否则分页查询会有问题
// 导航属性中有1:n关系，只统计主表
// 例：AccountList = a.Client.AccountList,
var subquery = tree.Subquery as DbQuerySelectTree;
if (tree.SelectHasMany && subquery != null && subquery.Aggregate != null)
{
tree = subquery;
}
var srcDbExpressionType = context.CurrentExpressionType;
var srcIsOutermost = context.CurrentIsOutermost;
if (srcDbExpressionType == null)
{
context.CurrentExpressionType = DbExpressionType.Select;
}
if (srcIsOutermost == null || !isOutermost)
{
context.CurrentIsOutermost = isOutermost;
}
bool useAggregate = tree.Aggregate != null;
// 没有聚合函数或者使用 'Skip' 子句，则解析OrderBy
// 导航属性如果使用嵌套，除非有 TOP 或者 OFFSET 子句，否则不能用ORDER BY
// 第一层的表别名
string alias = context != null && !string.IsNullOrEmpty(context.AliasPrefix) ? (context.AliasPrefix + "0") : "t0";
bool useSubquery = tree.HasDistinct || tree.GroupBy != null || tree.Skip > 0 || tree.Take > 0;
bool useOrderBy = (!useAggregate || tree.Skip > 0) && !tree.HasAny && (!tree.SelectHasMany || (tree.Skip > 0 || tree.Take > 0));
AliasGenerator ag = this.PrepareTableAlias(tree, context != null ? context.AliasPrefix : null);
var result = new SqlServerDbSelectCommand(context, ag, tree.SelectHasMany);
ISqlBuilder jf = result.JoinFragment;
ISqlBuilder wf = result.WhereFragment;
jf.Indent = indent;
#region 嵌套查询
if (useAggregate && useSubquery)
{
// SELECT
jf.Append("SELECT ");
jf.AppendNewLine();
// SELECT COUNT(1)
var visitor = new AggregateExpressionVisitor(ag, jf, tree.GroupBy, alias);
visitor.Visit(tree.Aggregate);
result.AddNavMembers(visitor.NavMembers);
// SELECT COUNT(1) FROM
jf.AppendNewLine();
jf.Append("FROM ( ");
indent += 1;
jf.Indent = indent;
context.CurrentIsOutermost = false;
}
#endregion 嵌套查询
#region 择子句
// SELECT 子句
if (jf.Indent > 0)
{
jf.AppendNewLine();
}
if (tree.HasAny)
{
jf.Append("IF EXISTS(");
indent += 1;
jf.Indent = indent;
jf.AppendNewLine();
}
jf.Append("SELECT ");
if (useAggregate && !useSubquery)
{
// 如果有聚合函数，并且不是嵌套的话，则直接使用SELECT <MAX,MIN...>，不需要解析选择的字段
jf.AppendNewLine();
var visitor = new AggregateExpressionVisitor(ag, jf, tree.GroupBy, null);
visitor.Visit(tree.Aggregate);
result.AddNavMembers(visitor.NavMembers);
}
else
{
// DISTINCT 子句
if (tree.HasDistinct)
{
jf.Append("DISTINCT ");
}
// TOP 子句
if (tree.Take > 0 && tree.Skip == 0)
{
jf.AppendFormat("TOP({0})", this.Constor.GetSqlValue(tree.Take, context));
}
// Any
if (tree.HasAny)
{
jf.Append("TOP 1 1");
}
#region 字段
if (!tree.HasAny)
{
// SELECT 范围
var visitor = new ColumnExpressionVisitor(ag, jf, tree);
visitor.Visit(tree.Select);
result.SelectedColumns = visitor.SelectedColumns;
result.SelectedColumnText = visitor.SelectedColumnText;
result.SelectedNavs = visitor.SelectedNavDescriptors;
result.AddNavMembers(visitor.NavMembers);
}
#endregion 字段
}
#endregion 择子句
#region 顺序解析
// FROM 子句
jf.AppendNewLine();
jf.Append("FROM ");
if (tree.Subquery != null)
{
// 子查询
jf.Append('(');
DbRawCommand cmd = this.TranslateSelectCommand(tree.Subquery, indent + 1, false, context);
jf.Append(cmd.CommandText);
jf.AppendNewLine();
jf.Append(") ");
jf.Append(alias);
jf.Append(' ');
}
else if (tree.FromSql != null)
{
if (tree.FromSql.DbContext == null)
{
tree.FromSql.DbContext = context.DbContext;
}
DbRawSql rawSql = tree.FromSql;
// 解析参数
object[] args = null;
if (rawSql.Parameters != null)
{
args = rawSql.Parameters.Select(x => this.Constor.GetSqlValue(x, context)).ToArray();
}
string sql = rawSql.CommandText;
if (args != null && args.Length > 0)
{
sql = string.Format(sql, args);
}
// 子查询
jf.Append('(');
var cmd = new DbRawCommand(sql, context.Parameters, CommandType.Text);
jf.Append(cmd.CommandText);
jf.AppendNewLine();
jf.Append(") ");
jf.Append(alias);
jf.Append(' ');
}
else
{
var typeRuntime = TypeRuntimeInfoCache.GetRuntimeInfo(tree.From);
jf.AppendTable(typeRuntime.TableSchema, typeRuntime.TableName, typeRuntime.IsTemporary);
jf.Append(' ');
jf.Append(alias);
jf.Append(' ');
bool isNoLock = ((SqlServerDbContext)context.DbContext).NoLock;
if (isNoLock && !string.IsNullOrEmpty(this._widthNoLock) && !typeRuntime.IsTemporary)
{
jf.Append(this._widthNoLock);
}
}
// LEFT<INNER> JOIN 子句
if (tree.Joins != null)
{
var visitor = new SqlServerJoinExpressionVisitor(ag, jf);
visitor.Visit(tree.Joins);
}
wf.Indent = jf.Indent;
// WHERE 子句
if (tree.Wheres != null)
{
var visitor = new WhereExpressionVisitor(ag, wf);
visitor.Visit(tree.Wheres);
result.AddNavMembers(visitor.NavMembers);
}
// GROUP BY 子句
if (tree.GroupBy != null)
{
var visitor = new GroupByExpressionVisitor(ag, wf);
visitor.Visit(tree.GroupBy);
result.AddNavMembers(visitor.NavMembers);
}
// HAVING 子句
if (tree.Havings != null)
{
var visitor = new HavingExpressionVisitor(ag, wf, tree.GroupBy);
visitor.Visit(tree.Havings);
result.AddNavMembers(visitor.NavMembers);
}
// ORDER 子句
if (tree.OrderBys != null && tree.OrderBys.Count > 0 && useOrderBy)
{
var visitor = new OrderByExpressionVisitor(ag, wf, tree.GroupBy, null);
visitor.Visit(tree.OrderBys);
result.AddNavMembers(visitor.NavMembers);
}
#endregion
#region 分页查询
if (tree.Skip > 0)
{
if (tree.OrderBys == null || tree.OrderBys.Count == 0)
{
throw new XFrameworkException("The method 'OrderBy' must be called before 'Skip'.");
}
wf.AppendNewLine();
wf.Append("OFFSET ");
wf.Append(this.Constor.GetSqlValue(tree.Skip, context));
wf.Append(" ROWS");
if (tree.Take > 0)
{
wf.Append(" FETCH NEXT ");
wf.Append(this.Constor.GetSqlValue(tree.Take, context));
wf.Append(" ROWS ONLY ");
}
}
#endregion 分页查询
#region 嵌套查询
if (useAggregate && useSubquery)
{
result.CombineFragments();
indent -= 1;
jf.Indent = indent;
jf.AppendNewLine();
jf.Append(") ");
jf.Append(alias);
jf.Append(' ');
}
#endregion 嵌套查询
#region 嵌套导航
if (tree.SelectHasMany && subquery.Aggregate == null &&
subquery != null && subquery.OrderBys != null && subquery.OrderBys.Count > 0 && !(subquery.Skip > 0 || subquery.Take > 0))
{
// TODO Include 从表，没分页，OrderBy 报错
result.CombineFragments();
var visitor = new OrderByExpressionVisitor(ag, jf, null, null);
visitor.Visit(subquery.OrderBys);
}
#endregion 嵌套导航
#region 并集查询
// UNION 子句
if (tree.Unions != null && tree.Unions.Count > 0)
{
result.CombineFragments();
for (int index = 0; index < tree.Unions.Count; index++)
{
jf.AppendNewLine();
jf.Append("UNION ALL");
if (indent == 0)
{
jf.AppendNewLine();
}
DbRawCommand cmd = this.TranslateSelectCommand(tree.Unions[index], indent, isOutermost, context);
jf.Append(cmd.CommandText);
}
}
#endregion 并集查询
#region Any 子句
// 'Any' 子句
if (tree.HasAny)
{
result.CombineFragments();
indent -= 1;
jf.Indent = indent;
jf.AppendNewLine();
jf.Append(") SELECT 1 ELSE SELECT 0");
}
#endregion Any 子句
#region 还原状态
context.CurrentExpressionType = srcDbExpressionType;
context.CurrentIsOutermost = srcIsOutermost;
#endregion
return(result);
}
/// <summary>
/// 解析 SELECT 命令
/// </summary>
/// <param name="tree">查询语义</param>
/// <param name="indent">缩进</param>
/// <param name="isOutermost">是否是最外层查询</param>
/// <param name="context">解析SQL命令上下文</param>
/// <returns></returns>
protected override DbRawCommand TranslateSelectCommand(DbQuerySelectTree tree, int indent, bool isOutermost, ITranslateContext context)
{
// 说明：
// 1.OFFSET 前必须要有 'ORDER BY'，即 'Skip' 子句前必须使用 'OrderBy' 子句
// 2.在有聚合函数的<MAX,MIN...>情况下，如果有 'Distinct' 'GroupBy' 'Skip' 'Take' 子句，则需要使用嵌套查询
// 3.'Any' 子句将翻译成 IF EXISTS...
// 4.分组再分页时需要使用嵌套查询，此时子查询不需要 'OrderBy' 子句，但最外层则需要
// 5.'Skip' 'Take' 子句视为语义结束符，在其之后的子句将使用嵌套查询
// 6.导航属性中有 1:n 关系的，需要使用嵌套查询，否则分页查询会有问题
// 8.如果有分页，则使用嵌套
// 9.如果有分页还有OrderBy，则使用嵌套的嵌套
// 导航属性中有1:n关系，只统计主表
// 例：AccountList = a.Client.AccountList,
var subquery = tree.Subquery as DbQuerySelectTree;
if (tree.SelectHasMany && subquery != null && subquery.Aggregate != null)
{
tree = subquery;
}
var srcDbExpressionType = context.CurrentExpressionType;
var srcIsOutmost = context.CurrentIsOutermost;
if (srcDbExpressionType == null)
{
context.CurrentExpressionType = DbExpressionType.Select;
}
if (srcIsOutmost == null || !isOutermost)
{
context.CurrentIsOutermost = isOutermost;
}
bool useAggregate = tree.Aggregate != null;
// 没有聚合函数或者使用 'Skip' 子句，则解析OrderBy
// 导航属性如果使用嵌套，除非有 TOP 或者 OFFSET 子句，否则不能用ORDER BY
// 第一层的表别名
string alias = context != null && !string.IsNullOrEmpty(context.AliasPrefix) ? (context.AliasPrefix + "0") : "t0";
bool useSubquery = tree.HasDistinct || tree.GroupBy != null || tree.Skip > 0 || tree.Take > 0;
bool useOrderBy = (!useAggregate || tree.Skip > 0) && !tree.HasAny && (!tree.SelectHasMany || (tree.Skip > 0 || tree.Take > 0));
AliasGenerator ag = this.PrepareTableAlias(tree, context != null ? context.AliasPrefix : null);
var result = new DbSelectCommand(context, ag, tree.SelectHasMany);
ISqlBuilder jf = result.JoinFragment;
ISqlBuilder wf = result.WhereFragment;
(jf as OracleSqlBuilder).UseQuote = isOutermost;
jf.Indent = indent;
#region 嵌套查询
if (useAggregate && useSubquery)
{
// SELECT
jf.Append("SELECT ");
jf.AppendNewLine();
// SELECT COUNT(1)
var visitor = new AggregateExpressionVisitor(ag, jf, tree.GroupBy, alias);
visitor.Visit(tree.Aggregate);
result.AddNavMembers(visitor.NavMembers);
// SELECT COUNT(1) FROM
jf.AppendNewLine();
jf.Append("FROM ( ");
indent += 1;
jf.Indent = indent;
(jf as OracleSqlBuilder).UseQuote = false;
context.CurrentIsOutermost = false;
}
#endregion
#region 择子句
// SELECT 子句
if (jf.Indent > 0)
{
jf.AppendNewLine();
}
jf.Append("SELECT ");
if (tree.HasAny)
{
jf.Append("CASE WHEN COUNT(1) = 1 THEN 1 ELSE 0 END FROM (");
indent += 1;
jf.Indent = indent;
jf.AppendNewLine();
jf.Append("SELECT 1 ");
}
if (useAggregate && !useSubquery)
{
// 如果有聚合函数，并且不是嵌套的话，则直接使用SELECT <MAX,MIN...>，不需要解析选择的字段
jf.AppendNewLine();
var visitor = new AggregateExpressionVisitor(ag, jf, tree.GroupBy, null);
visitor.Visit(tree.Aggregate);
result.AddNavMembers(visitor.NavMembers);
}
else
{
// DISTINCT 子句
if (tree.HasDistinct)
{
jf.Append("DISTINCT ");
}
#region 择字段
if (!tree.HasAny)
{
// SELECT 范围
ISqlBuilder sf = this.CreateSqlBuilder(context);
sf.Indent = jf.Indent + ((tree.Skip > 0 || tree.Take > 0) ? 2 : 0);
(sf as OracleSqlBuilder).UseQuote = (tree.Skip > 0 || tree.Take > 0) ? false : (jf as OracleSqlBuilder).UseQuote;
var visitor = new OracleColumnExpressionVisitor(ag, sf, tree);
visitor.Visit(tree.Select);
result.SelectedColumns = visitor.SelectedColumns;
result.SelectedColumnText = visitor.SelectedColumnText;
result.SelectedNavs = visitor.SelectedNavDescriptors;
result.AddNavMembers(visitor.NavMembers);
// 分页，产生两层嵌套
if (tree.Skip > 0 || tree.Take > 0)
{
// 第一层嵌套
int index = 0;
jf.AppendNewLine();
foreach (var column in result.SelectedColumns)
{
jf.AppendMember(alias, column.Name);
jf.AppendAs(column.NewName);
index += 1;
if (index < result.SelectedColumns.Count)
{
jf.Append(',');
jf.AppendNewLine();
}
}
jf.AppendNewLine();
jf.Append("FROM(");
// 第二层嵌套
indent += 1;
isOutermost = false;
jf.Indent = indent;
(jf as OracleSqlBuilder).UseQuote = isOutermost;
jf.AppendNewLine();
jf.Append("SELECT");
jf.AppendNewLine();
foreach (var column in result.SelectedColumns)
{
jf.AppendMember(alias, column.NewName);
jf.AppendAs(column.NewName);
jf.Append(',');
jf.AppendNewLine();
}
jf.Append("ROWNUM");
jf.AppendAs("Row_Number0");
jf.AppendNewLine();
jf.Append("FROM(");
// 第三层嵌套
indent += 1;
jf.Indent = indent;
jf.AppendNewLine();
jf.Append("SELECT");
}
jf.Append(sf);
}
#endregion
}
#endregion
#region 顺序解析
// FROM 子句
jf.AppendNewLine();
jf.Append("FROM ");
if (tree.Subquery != null)
{
// 子查询
jf.Append('(');
DbRawCommand cmd = this.TranslateSelectCommand(tree.Subquery, indent + 1, false, context);
jf.Append(cmd.CommandText);
jf.AppendNewLine();
jf.Append(") ");
jf.Append(alias);
jf.Append(' ');
}
else if (tree.FromSql != null)
{
if (tree.FromSql.DbContext == null)
{
tree.FromSql.DbContext = context.DbContext;
}
DbRawSql rawSql = tree.FromSql;
// 解析参数
object[] args = null;
if (rawSql.Parameters != null)
{
args = rawSql.Parameters.Select(x => this.Constor.GetSqlValue(x, context)).ToArray();
}
string sql = rawSql.CommandText;
if (args != null && args.Length > 0)
{
sql = string.Format(sql, args);
}
// 子查询
jf.Append('(');
var cmd = new DbRawCommand(sql, context.Parameters, CommandType.Text);
jf.Append(cmd.CommandText);
jf.AppendNewLine();
jf.Append(") ");
jf.Append(alias);
jf.Append(' ');
}
else
{
var typeRuntime = TypeRuntimeInfoCache.GetRuntimeInfo(tree.From);
jf.AppendTable(typeRuntime.TableSchema, typeRuntime.TableName, typeRuntime.IsTemporary);
jf.Append(' ');
jf.Append(alias);
jf.Append(' ');
}
// LEFT<INNER> JOIN 子句
if (tree.Joins != null)
{
var visitor = new JoinExpressionVisitor(ag, jf);
visitor.Visit(tree.Joins);
}
wf.Indent = jf.Indent;
// WHERE 子句
if (tree.Wheres != null)
{
var visitor = new WhereExpressionVisitor(ag, wf);
visitor.Visit(tree.Wheres);
result.AddNavMembers(visitor.NavMembers);
}
// GROUP BY 子句
if (tree.GroupBy != null)
{
var visitor = new GroupByExpressionVisitor(ag, wf);
visitor.Visit(tree.GroupBy);
result.AddNavMembers(visitor.NavMembers);
}
// HAVING 子句
if (tree.Havings != null)
{
var visitor = new HavingExpressionVisitor(ag, wf, tree.GroupBy);
visitor.Visit(tree.Havings);
result.AddNavMembers(visitor.NavMembers);
}
// ORDER 子句
if (tree.OrderBys != null && tree.OrderBys.Count > 0 && useOrderBy)
{
var visitor = new OrderByExpressionVisitor(ag, wf, tree.GroupBy, null);
visitor.Visit(tree.OrderBys);
result.AddNavMembers(visitor.NavMembers);
}
#endregion
#region 嵌套查询
if (useAggregate && useSubquery)
{
result.CombineFragments();
indent -= 1;
jf.Indent = indent;
jf.AppendNewLine();
jf.Append(") ");
jf.Append(alias);
}
#endregion
#region 嵌套导航
// TODO Include 从表，没分页，OrderBy 报错
if (tree.SelectHasMany && subquery.Aggregate == null &&
subquery != null && subquery.OrderBys != null && subquery.OrderBys.Count > 0 && !(subquery.Skip > 0 || subquery.Take > 0))
{
// OrderBy("a.CloudServer.CloudServerName");
result.CombineFragments();
var visitor = new OrderByExpressionVisitor(ag, jf, null, null);
visitor.Visit(subquery.OrderBys);
}
#endregion
#region 并集查询
// UNION 子句
if (tree.Unions != null && tree.Unions.Count > 0)
{
result.CombineFragments();
for (int index = 0; index < tree.Unions.Count; index++)
{
jf.AppendNewLine();
jf.Append("UNION ALL");
if (indent == 0)
{
jf.AppendNewLine();
}
DbRawCommand cmd2 = this.TranslateSelectCommand(tree.Unions[index], indent, isOutermost, context);
jf.Append(cmd2.CommandText);
}
}
#endregion
#region 分页查询
if (tree.Take > 0 || tree.Skip > 0)
{
// 合并 WHERE
result.CombineFragments();
indent -= 1;
jf.Indent = indent;
jf.AppendNewLine();
jf.Append(") ");
jf.Append(alias);
indent -= 1;
jf.Indent = indent;
jf.AppendNewLine();
jf.Append(") ");
jf.Append(alias);
jf.AppendNewLine();
jf.Append("WHERE ");
if (tree.Skip > 0)
{
jf.AppendMember(alias, "Row_Number0");
jf.Append(" > ");
jf.Append(this.Constor.GetSqlValue(tree.Skip, context));
}
if (tree.Take > 0)
{
if (tree.Skip > 0)
{
jf.Append(" AND ");
}
jf.AppendMember(alias, "Row_Number0");
jf.Append(" <= ");
jf.Append(this.Constor.GetSqlValue((tree.Skip + tree.Take), context));
}
}
#endregion
#region Any子句
// 'Any' 子句
if (tree.HasAny)
{
// 产生 WHERE 子句
result.CombineFragments();
// 如果没有分页，则显式指定只查一笔记录
if (tree.Take == 0 && tree.Skip == 0)
{
if (tree.Wheres != null && tree.Wheres.Count > 0)
{
jf.Append(" AND ROWNUM <= 1");
}
else
{
jf.AppendNewLine();
jf.Append("WHERE ROWNUM <= 1");
}
}
indent -= 1;
jf.Indent = indent;
jf.AppendNewLine();
jf.Append(") ");
jf.Append(alias);
}
#endregion
#region 还原状态
context.CurrentExpressionType = srcDbExpressionType;
context.CurrentIsOutermost = srcIsOutmost;
#endregion
return(result);
}
// LEFT OR INNER JOIN
private void AppendLfInJoin(ISqlBuilder jf, ISqlBuilder on, DbExpression dbExpression)
{
DbQueryable dbQueryable = (DbQueryable)((dbExpression.Expressions[0] as ConstantExpression).Value);
dbQueryable.Parameterized = jf.Parameterized;
if (!usedKeyword)
{
jf.AppendNewLine();
jf.Append(_keywordName);
usedKeyword = true;
}
else
{
jf.Append(',');
jf.AppendNewLine();
jf.Append(_pad);
}
if (dbQueryable.DbExpressions.Count == 1 && dbQueryable.DbExpressions[0].DbExpressionType == DbExpressionType.GetTable)
{
// 区别 GetTable 有三个重载
var expressions = dbQueryable.DbExpressions[0].Expressions;
if (expressions.Length == 2 && ((expressions[0] as ConstantExpression).Value as string) != null)
{
string text = (expressions[0] as ConstantExpression).Value as string;
object[] @params = (expressions[1] as ConstantExpression).Value as object[];
var provider = ((DbQueryProvider)jf.Provider);
var context = jf.TranslateContext;
// 解析参数
object[] args = null;
if (@params != null)
{
args = @params.Select(x => provider.Constor.GetSqlValue(x, context)).ToArray();
}
string sql = text;
if (args != null && args.Length > 0)
{
sql = string.Format(sql, args);
}
var cmd = new DbRawCommand(sql, context.Parameters, CommandType.Text);
jf.Append("( ");
jf.Append(_dbExpressionType == DbExpressionType.Delete ? cmd.CommandText.TrimStart() : cmd.CommandText);
jf.Append(')');
}
else
{
Type type = dbExpression.Expressions[0].Type.GetGenericArguments()[0];
var typeRuntime = TypeRuntimeInfoCache.GetRuntimeInfo(type);
jf.AppendTable(typeRuntime.TableSchema, typeRuntime.TableName, typeRuntime.IsTemporary);
}
}
else
{
// 嵌套
var cmd = dbQueryable.Translate(jf.Indent + _dbExpressionType == DbExpressionType.Delete ? 2 : 1, false, jf.TranslateContext);
jf.Append("( ");
jf.Append(_dbExpressionType == DbExpressionType.Delete ? cmd.CommandText.TrimStart() : cmd.CommandText);
jf.Append(')');
}
LambdaExpression left = dbExpression.Expressions[1] as LambdaExpression;
LambdaExpression right = dbExpression.Expressions[2] as LambdaExpression;
// t0(t1)
string alias = !(left.Body.NodeType == ExpressionType.New || left.Body.NodeType == ExpressionType.MemberInit)
? _ag.GetTableAlias(dbExpression.Expressions[2])
: _ag.GetTableAlias(right.Parameters[0]);
jf.Append(' ');
jf.Append(alias);
if (on.Length > 0)
{
on.Append(" AND ");
}
if (left.Body.NodeType == ExpressionType.New)
{
NewExpression body1 = left.Body as NewExpression;
NewExpression body2 = right.Body as NewExpression;
for (int index = 0; index < body1.Arguments.Count; ++index)
{
on.AppendMember(_ag, body1.Arguments[index]);
on.Append(" = ");
on.AppendMember(_ag, body2.Arguments[index]);
if (index < body1.Arguments.Count - 1)
{
on.Append(" AND ");
}
}
}
else if (left.Body.NodeType == ExpressionType.MemberInit)
{
MemberInitExpression body1 = left.Body as MemberInitExpression;
MemberInitExpression body2 = right.Body as MemberInitExpression;
for (int index = 0; index < body1.Bindings.Count; ++index)
{
on.AppendMember(_ag, (body1.Bindings[index] as MemberAssignment).Expression);
on.Append(" = ");
on.AppendMember(_ag, (body2.Bindings[index] as MemberAssignment).Expression);
if (index < body1.Bindings.Count - 1)
{
on.Append(" AND ");
}
}
}
else
{
on.AppendMember(_ag, left.Body.ReduceUnary());
on.Append(" = ");
on.AppendMember(_ag, right.Body.ReduceUnary());
}
}
/// <summary>
/// 创建 UPDATE 命令
/// </summary>
/// <param name="tree">查询语义</param>
/// <param name="context">解析SQL命令上下文</param>
/// <returns></returns>
protected override DbRawCommand TranslateUpdateCommand <T>(DbQueryUpdateTree tree, ITranslateContext context)
{
ISqlBuilder builder = this.CreateSqlBuilder(context);
var typeRuntime = TypeRuntimeInfoCache.GetRuntimeInfo <T>();
builder.Append("UPDATE ");
builder.AppendTable(typeRuntime.TableSchema, typeRuntime.TableName, typeRuntime.IsTemporary);
builder.Append(" t0");
if (tree.Entity != null)
{
object entity = tree.Entity;
ISqlBuilder whereBuilder = this.CreateSqlBuilder(context);
bool useKey = false;
int length = 0;
builder.AppendNewLine(" SET");
foreach (var item in typeRuntime.Members)
{
var m = item as FieldAccessorBase;
if (m == null || !m.IsDbField)
{
continue;
}
if (m.Column != null && m.Column.IsIdentity)
{
goto LABEL; // Fix issue# 自增列同时又是主键
}
builder.AppendMember("t0", m.Member, typeRuntime.Type);
builder.Append(" = ");
LABEL:
var value = m.Invoke(entity);
var seg = this.Constor.GetSqlValueWidthDefault(value, context, m.Column);
if (m.Column == null || !m.Column.IsIdentity)
{
builder.Append(seg);
length = builder.Length;
builder.Append(',');
builder.AppendNewLine();
}
if (m.Column != null && m.Column.IsKey)
{
useKey = true;
whereBuilder.AppendMember("t0", m.Member, typeRuntime.Type);
whereBuilder.Append(" = ");
whereBuilder.Append(seg);
whereBuilder.Append(" AND ");
}
}
if (!useKey)
{
throw new XFrameworkException("Update<T>(T value) require T must have key column.");
}
builder.Length = length;
whereBuilder.Length -= 5;
builder.AppendNewLine();
builder.Append("WHERE ");
builder.Append(whereBuilder);
}
else if (tree.Expression != null)
{
AliasGenerator ag = this.PrepareTableAlias(tree.Select, context.AliasPrefix);
DbExpressionVisitor visitor = null;
var cmd = new DbSelectCommand(context, ag, tree.Select.SelectHasMany);
if (tree.Select.Joins != null)
{
visitor = new JoinExpressionVisitor(ag, cmd.JoinFragment);
visitor.Visit(tree.Select.Joins);
}
cmd.WhereFragment.AppendNewLine();
cmd.WhereFragment.AppendNewLine("SET");
visitor = new UpdateExpressionVisitor(ag, cmd.WhereFragment);
visitor.Visit(tree.Expression);
if (tree.Select.Wheres != null)
{
visitor = new WhereExpressionVisitor(ag, cmd.WhereFragment);
visitor.Visit(tree.Select.Wheres);
cmd.AddNavMembers(visitor.NavMembers);
}
builder.Append(cmd.CommandText);
}
builder.Append(';');
return(new DbRawCommand(builder.ToString(), builder.TranslateContext != null ? builder.TranslateContext.Parameters : null, System.Data.CommandType.Text));
}
/// <summary>
/// 创建 INSRT 命令
/// </summary>
/// <param name="tree">查询语义</param>
/// <param name="context">解析SQL命令上下文</param>
/// <returns></returns>
protected override DbRawCommand TranslateInsertCommand <T>(DbQueryInsertTree tree, ITranslateContext context)
{
ISqlBuilder builder = this.CreateSqlBuilder(context);;
var typeRuntime = TypeRuntimeInfoCache.GetRuntimeInfo <T>();
if (tree.Entity != null)
{
// 如果没有Sequence列，使用 INSERT ALL INTO 语法，否则就一条一条逐行写入~~
// 批量 INSERT，自增列不会自动赋值
object entity = tree.Entity;
ISqlBuilder columnsBuilder = this.CreateSqlBuilder(context);
ISqlBuilder valuesBuilder = this.CreateSqlBuilder(context);
// 指定插入列
var members = typeRuntime.Members;
if (tree.EntityColumns != null && tree.EntityColumns.Count > 0)
{
members = new MemberAccessorCollection();
for (int i = 0; i < tree.EntityColumns.Count; i++)
{
Expression curExpr = tree.EntityColumns[i];
if (curExpr.NodeType == ExpressionType.Lambda)
{
curExpr = (curExpr as LambdaExpression).Body.ReduceUnary();
}
if (curExpr.NodeType != ExpressionType.MemberAccess)
{
throw new XFrameworkException("Can't read field name from expression {0}", tree.EntityColumns[i]);
}
MemberExpression member = curExpr as MemberExpression;
string name = member.Member.Name;
members[name] = typeRuntime.Members[name];
}
}
// 自增列参数
IDbDataParameter seqParameter = null;
// 自增列标记
ColumnAttribute seqColumn = null;
foreach (var item in members)
{
var m = item as FieldAccessorBase;
if (m == null || !m.IsDbField)
{
continue;
}
columnsBuilder.AppendMember(null, m.Member, typeRuntime.Type);
columnsBuilder.Append(',');
if (m == typeRuntime.Identity)
{
seqColumn = m.Column;
if (tree.Bulk == null)
{
// 非批量INSERT，产生一个 OUTPUT 类型的参数
string parameterName = string.Format("{0}{1}{2}", this.ParameterPrefix, AppConst.PARAMETER_NAME_PRIFIX, context.Parameters.Count);
seqParameter = this.DbProvider.CreateParameter(parameterName, -1, direction: ParameterDirection.Output);
context.Parameters.Add(seqParameter);
valuesBuilder.Append(seqParameter.ParameterName);
valuesBuilder.Append(',');
}
else
{
valuesBuilder.AppendMember(((OracleColumnAttribute)m.Column).SEQName);
valuesBuilder.Append(".NEXTVAL");
valuesBuilder.Append(',');
}
}
else
{
var value = m.Invoke(entity);
string sqlExpression = this.Constor.GetSqlValueWidthDefault(value, context, m.Column);
valuesBuilder.Append(sqlExpression);
valuesBuilder.Append(',');
}
}
columnsBuilder.Length -= 1;
valuesBuilder.Length -= 1;
if (tree.Bulk == null)
{
// 非批量INSERT，产生一个 OUTPUT 类型的参数
if (seqParameter != null)
{
seqParameter.Direction = ParameterDirection.Output;
seqParameter.DbType = DbType.Int64;
builder.Append("SELECT ");
builder.AppendMember(((OracleColumnAttribute)seqColumn).SEQName);
builder.Append(".NEXTVAL INTO ");
builder.Append(seqParameter.ParameterName);
builder.Append(" FROM DUAL;");
builder.AppendNewLine();
//useSEQ = true;
}
builder.Append("INSERT ");
}
else
{
// 批量 INSERT
if (!tree.Bulk.OnlyValue || seqColumn != null)
{
builder.Append("INSERT ");
}
// 如果有自增列则不使用 INSERT ALL INTO 语法
if (!tree.Bulk.OnlyValue && seqColumn == null)
{
builder.Append("ALL ");
}
}
builder.Append("INTO ");
builder.AppendTable(typeRuntime.TableSchema, typeRuntime.TableName, typeRuntime.IsTemporary);
builder.Append('(');
builder.Append(columnsBuilder);
builder.Append(')');
builder.AppendNewLine();
builder.AppendTab();
builder.Append("VALUES");
builder.Append('(');
builder.Append(valuesBuilder);
builder.Append(')');
if (tree.Bulk == null)
{
builder.Append(';');
}
else
{
if (seqColumn != null)
{
if (tree.Bulk.IsEndPos)
{
builder.Append(";");
}
else
{
builder.AppendNewLine(";");
}
}
else
{
builder.AppendNewLine();
if (tree.Bulk.IsEndPos)
{
builder.Append("SELECT 1 FROM DUAL;");
}
}
}
}
else if (tree.Select != null)
{
builder.Append("INSERT INTO ");
builder.AppendTable(typeRuntime.TableSchema, typeRuntime.TableName, typeRuntime.IsTemporary);
builder.Append('(');
var srcExpressionType = context.CurrentExpressionType;
var srcIsOutermost = context.CurrentIsOutermost;
context.CurrentExpressionType = DbExpressionType.Insert;
context.CurrentIsOutermost = false;
var cmd = this.TranslateSelectCommand(tree.Select, 0, false, context) as DbSelectCommand;
context.CurrentExpressionType = srcExpressionType;
context.CurrentIsOutermost = srcIsOutermost;
int index = 0;
foreach (var column in cmd.SelectedColumns)
{
builder.AppendMember(column.Name);
if (index < cmd.SelectedColumns.Count - 1)
{
builder.Append(',');
}
index++;
}
builder.Append(')');
builder.AppendNewLine();
builder.Append(cmd.CommandText);
builder.Append(';');
}
var result = new DbRawCommand(builder.ToString(), builder.TranslateContext != null ? builder.TranslateContext.Parameters : null, System.Data.CommandType.Text);
return(result);
}
/// <summary>
/// 添加导航属性关联
/// </summary>
protected override void TanslateNavMember()
{
if (this.NavMembers == null || this.NavMembers.Count == 0)
{
return;
}
// 如果有一对多的导航属性，肯定会产生嵌套查询。那么内层查询别名肯定是t0，所以需要清掉
if (this.HasMany)
{
_aliasGenerator = new AliasGenerator(_aliasGenerator.ReserveQty);
}
//开始产生 USING 子句
ISqlBuilder jf = this.JoinFragment;
int index = -1;
// 未生成USING子句
if (_aliasGenerator.ReserveQty <= 1)
{
jf.AppendNewLine();
jf.Append(_keywordName);
}
else
{
jf.Append(',');
jf.AppendNewLine();
}
foreach (var nav in this.NavMembers)
{
index++;
string key = nav.Key;
MemberExpression m = nav.Expression;
TypeRuntimeInfo typeRuntime = TypeRuntimeInfoCache.GetRuntimeInfo(m.Expression.Type);
ForeignKeyAttribute attribute = typeRuntime.GetMemberAttribute <ForeignKeyAttribute>(m.Member.Name);
string innerKey = string.Empty;
string outerKey = key;
string innerAlias = string.Empty;
if (!m.Expression.Visitable())
{
innerKey = m.Expression.NodeType == ExpressionType.Parameter
? (m.Expression as ParameterExpression).Name
: (m.Expression as MemberExpression).Member.Name;
}
else
{
MemberExpression mLeft = null;
if (m.Expression.NodeType == ExpressionType.MemberAccess)
{
mLeft = m.Expression as MemberExpression;
}
else if (m.Expression.NodeType == ExpressionType.Call)
{
mLeft = (m.Expression as MethodCallExpression).Object as MemberExpression;
}
string name = TypeRuntimeInfoCache.GetRuntimeInfo(mLeft.Type).TableFullName;
innerAlias = _aliasGenerator.GetJoinTableAlias(name);
if (string.IsNullOrEmpty(innerAlias))
{
string keyLeft = mLeft.GetKeyWidthoutAnonymous();
if (this.NavMembers.Contains(keyLeft))
{
innerKey = keyLeft;
}
innerAlias = _aliasGenerator.GetNavTableAlias(innerKey);
}
}
string alias1 = !string.IsNullOrEmpty(innerAlias) ? innerAlias : _aliasGenerator.GetTableAlias(innerKey);
string alias2 = _aliasGenerator.GetNavTableAlias(outerKey);
// 补充与USING字符串同等间距的空白
if (_aliasGenerator.ReserveQty > 1 || index > 0)
{
jf.Append(_pad);
}
Type type = m.Type;
var typeRumtime2 = TypeRuntimeInfoCache.GetRuntimeInfo(type);
if (type.IsGenericType)
{
type = type.GetGenericArguments()[0];
}
jf.AppendTable(typeRumtime2.TableSchema, typeRumtime2.TableName, typeRumtime2.IsTemporary);
jf.Append(' ');
jf.Append(alias2);
if (_onPhrase.Length > 0)
{
_onPhrase.Append(" AND ");
}
for (int i = 0; i < attribute.InnerKeys.Length; i++)
{
if (attribute.InnerKeys[i].StartsWith(AppConst.CONSTANT_FOREIGNKEY, StringComparison.Ordinal))
{
_onPhrase.Append(attribute.InnerKeys[i].Substring(7));
}
else
{
_onPhrase.Append(alias1);
_onPhrase.Append('.');
_onPhrase.AppendMember(attribute.InnerKeys[i]);
}
_onPhrase.Append(" = ");
if (attribute.OuterKeys[i].StartsWith(AppConst.CONSTANT_FOREIGNKEY, StringComparison.Ordinal))
{
_onPhrase.Append(attribute.OuterKeys[i].Substring(7));
}
else
{
_onPhrase.Append(alias2);
_onPhrase.Append('.');
_onPhrase.AppendMember(attribute.OuterKeys[i]);
}
}
if (nav.Predicate != null)
{
string alias = _aliasGenerator.GetNavTableAlias(nav.Key);
var visitor = new NavPredicateExpressionVisitor(_aliasGenerator, _onPhrase, alias);
visitor.Visit(nav.Predicate);
}
if (index < this.NavMembers.Count - 1)
{
jf.Append(',');
jf.AppendNewLine();
}
}
}
/// <summary>
/// 创建 INSRT 命令
/// </summary>
/// <param name="tree">查询语义</param>
/// <param name="context">解析上下文</param>
/// <returns></returns>
protected override DbRawCommand TranslateInsertCommand <T>(DbQueryInsertTree tree, ITranslateContext context)
{
// 增删改不用 NOLOCK
bool noLock = ((SqlServerDbContext)context.DbContext).NoLock;
((SqlServerDbContext)context.DbContext).NoLock = false;
ISqlBuilder builder = this.CreateSqlBuilder(context);
var typeRuntime = TypeRuntimeInfoCache.GetRuntimeInfo <T>();
if (tree.Entity != null)
{
object entity = tree.Entity;
ISqlBuilder columnsBuilder = this.CreateSqlBuilder(context);
ISqlBuilder valuesBuilder = this.CreateSqlBuilder(context);
// 指定插入列
var members = typeRuntime.Members;
if (tree.EntityColumns != null && tree.EntityColumns.Count > 0)
{
members = new MemberAccessorCollection();
for (int i = 0; i < tree.EntityColumns.Count; i++)
{
Expression expression = tree.EntityColumns[i];
if (expression.NodeType == ExpressionType.Lambda)
{
expression = (expression as LambdaExpression).Body.ReduceUnary();
}
if (expression.NodeType != ExpressionType.MemberAccess)
{
throw new XFrameworkException("ERR {0}: Only support MemberAccess expression.", tree.EntityColumns[i]);
}
var member = expression as MemberExpression;
string name = member.Member.Name;
members[name] = typeRuntime.Members[name];
}
}
foreach (var item in members)
{
var m = item as FieldAccessorBase;
if (m == null || !m.IsDbField)
{
continue;
}
// 忽略行版本号列
if (m.Column != null && m.Column.DbType is SqlDbType && (SqlDbType)m.Column.DbType == SqlDbType.Timestamp)
{
continue;
}
if (item != typeRuntime.Identity)
{
columnsBuilder.AppendMember(null, item.Member, typeRuntime.Type);
columnsBuilder.Append(',');
var value = item.Invoke(entity);
string sqlExpression = this.Constor.GetSqlValueWidthDefault(value, context, m.Column);
valuesBuilder.Append(sqlExpression);
valuesBuilder.Append(',');
}
}
columnsBuilder.Length -= 1;
valuesBuilder.Length -= 1;
if (tree.Bulk == null || !tree.Bulk.OnlyValue)
{
builder.Append("INSERT INTO ");
builder.AppendTable(typeRuntime.TableSchema, typeRuntime.TableName, typeRuntime.IsTemporary);
builder.Append('(');
builder.Append(columnsBuilder);
builder.Append(')');
if (tree.Bulk != null && typeRuntime.Identity != null)
{
builder.AppendNewLine();
builder.Append("OUTPUT INSERTED.");
string memberName = TypeUtils.GetFieldName(typeRuntime.Identity.Member, typeRuntime.Type);
builder.AppendMember(memberName);
builder.AppendAs(AppConst.AUTO_INCREMENT_NAME);
}
builder.AppendNewLine();
builder.AppendTab();
builder.Append("VALUES");
}
builder.Append('(');
builder.Append(valuesBuilder);
builder.Append(')');
if (tree.Bulk != null && !tree.Bulk.IsEndPos)
{
builder.Append(",");
}
if (tree.Bulk == null && typeRuntime.Identity != null)
{
builder.AppendNewLine();
builder.Append("SELECT SCOPE_IDENTITY()");
builder.AppendAs(AppConst.AUTO_INCREMENT_NAME);
}
}
else if (tree.Select != null)
{
builder.Append("INSERT INTO ");
builder.AppendTable(typeRuntime.TableSchema, typeRuntime.TableName, typeRuntime.IsTemporary);
builder.Append('(');
var srcDbExpressionType = context.CurrentExpressionType;
var srcIsOutermost = context.CurrentIsOutermost;
context.CurrentExpressionType = DbExpressionType.Insert;
context.CurrentIsOutermost = true;
var cmd = this.TranslateSelectCommand(tree.Select, 0, true, context) as DbSelectCommand;
context.CurrentExpressionType = srcDbExpressionType;
context.CurrentIsOutermost = srcIsOutermost;
int index = 0;
foreach (ColumnDescriptor column in cmd.SelectedColumns)
{
builder.AppendMember(column.NewName);
if (index < cmd.SelectedColumns.Count - 1)
{
builder.Append(',');
}
index++;
}
builder.Append(')');
builder.AppendNewLine();
builder.Append(cmd.CommandText);
}
((SqlServerDbContext)context.DbContext).NoLock = noLock;
return(new DbRawCommand(builder.ToString(), builder.TranslateContext != null ? builder.TranslateContext.Parameters : null, System.Data.CommandType.Text));
}
