// 创建 UPDATE 命令
protected override Command ParseUpdateCommand <T>(DbQueryableInfo_Update <T> uQueryInfo, ParserToken token)
{
ISqlBuilder builder = this.CreateSqlBuilder(token);
var typeRuntime = TypeRuntimeInfoCache.GetRuntimeInfo <T>();
builder.Append("UPDATE t0 SET");
builder.AppendNewLine();
if (uQueryInfo.Entity != null)
{
object entity = uQueryInfo.Entity;
ISqlBuilder whereBuilder = this.CreateSqlBuilder(token);
bool useKey = false;
int length = 0;
foreach (var kv in typeRuntime.Invokers)
{
MemberInvokerBase invoker = kv.Value;
var column = invoker.Column;
if (column != null && column.IsIdentity)
{
goto gotoLabel; // fix issue# 自增列同时又是主键
}
if (column != null && column.NoMapped)
{
continue;
}
if (invoker.Column != null && column.DbType is SqlDbType && (SqlDbType)column.DbType == SqlDbType.Timestamp)
{
continue; // 行版本号
}
if (invoker.ForeignKey != null)
{
continue;
}
if (invoker.Member.MemberType == System.Reflection.MemberTypes.Method)
{
continue;
}
builder.AppendMember("t0", invoker.Member.Name);
builder.Append(" = ");
gotoLabel:
var value = invoker.Invoke(entity);
var seg = builder.GetSqlValueWidthDefault(value, column);
if (column == null || !column.IsIdentity)
{
builder.Append(seg);
length = builder.Length;
builder.Append(',');
builder.AppendNewLine();
}
if (column != null && column.IsKey)
{
useKey = true;
whereBuilder.AppendMember("t0", invoker.Member.Name);
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("FROM ");
builder.AppendMember(typeRuntime.TableName, !typeRuntime.IsTemporary);
builder.Append(" t0");
builder.AppendNewLine();
builder.Append("WHERE ");
builder.Append(whereBuilder);
}
else if (uQueryInfo.Expression != null)
{
TableAliasCache aliases = this.PrepareAlias <T>(uQueryInfo.SelectInfo, token);
ExpressionVisitorBase visitor = null;
visitor = new UpdateExpressionVisitor(this, aliases, uQueryInfo.Expression);
visitor.Write(builder);
builder.AppendNewLine();
builder.Append("FROM ");
builder.AppendMember(typeRuntime.TableName, !typeRuntime.IsTemporary);
builder.AppendAs("t0");
var cmd2 = new SelectCommand(this, aliases, token)
{
HasManyNavigation = uQueryInfo.SelectInfo.HasManyNavigation
};
visitor = new JoinExpressionVisitor(this, aliases, uQueryInfo.SelectInfo.Joins);
visitor.Write(cmd2.JoinFragment);
visitor = new WhereExpressionVisitor(this, aliases, uQueryInfo.SelectInfo.WhereExpression);
visitor.Write(cmd2.WhereFragment);
cmd2.AddNavMembers(visitor.NavMembers);
builder.Append(cmd2.CommandText);
}
return(new Command(builder.ToString(), builder.Token != null ? builder.Token.Parameters : null, System.Data.CommandType.Text));
}
// 创建 DELETE 命令
protected override Command ParseDeleteCommand <T>(DbQueryableInfo_Delete <T> dQueryInfo, ParserToken token)
{
TypeRuntimeInfo typeRuntime = TypeRuntimeInfoCache.GetRuntimeInfo <T>();
ISqlBuilder builder = this.CreateSqlBuilder(token);
bool useKey = false;
builder.Append("DELETE t0 FROM ");
builder.AppendMember(typeRuntime.TableName, !typeRuntime.IsTemporary);
builder.Append(" t0 ");
if (dQueryInfo.Entity != null)
{
object entity = dQueryInfo.Entity;
builder.AppendNewLine();
builder.Append("WHERE ");
foreach (var kv in typeRuntime.Invokers)
{
MemberInvokerBase invoker = kv.Value;
var column = invoker.Column;
if (column != null && column.IsKey)
{
useKey = true;
var value = invoker.Invoke(entity);
var seg = builder.GetSqlValue(value, column);
builder.AppendMember("t0", invoker.Member.Name);
builder.Append(" = ");
builder.Append(seg);
builder.Append(" AND ");
}
;
}
builder.Length -= 5;
if (!useKey)
{
throw new XFrameworkException("Delete<T>(T value) require T must have key column.");
}
}
else if (dQueryInfo.SelectInfo != null)
{
IDbQueryable dbQueryable = dQueryInfo.SourceQuery;
TableAliasCache aliases = this.PrepareAlias <T>(dQueryInfo.SelectInfo, token);
var cmd2 = new SelectCommand(this, aliases, token)
{
HasManyNavigation = dQueryInfo.SelectInfo.HasManyNavigation
};
ExpressionVisitorBase visitor = new JoinExpressionVisitor(this, aliases, dQueryInfo.SelectInfo.Joins);
visitor.Write(cmd2.JoinFragment);
visitor = new WhereExpressionVisitor(this, aliases, dQueryInfo.SelectInfo.WhereExpression);
visitor.Write(cmd2.WhereFragment);
cmd2.AddNavMembers(visitor.NavMembers);
builder.Append(cmd2.CommandText);
}
return(new Command(builder.ToString(), builder.Token != null ? builder.Token.Parameters : null, System.Data.CommandType.Text));
}
// 创建 SELECT 命令
protected override Command ParseSelectCommand <T>(DbQueryableInfo_Select <T> sQueryInfo, int indent, bool isOuter, ParserToken token)
{
// 说明：
// 1.OFFSET 前必须要有 'ORDER BY'，即 'Skip' 子句前必须使用 'OrderBy' 子句
// 2.在有统计函数的<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,
DbQueryableInfo_Select <T> subQuery = sQueryInfo.SubQueryInfo as DbQueryableInfo_Select <T>;
if (sQueryInfo.HasManyNavigation && subQuery != null && subQuery.StatisExpression != null)
{
sQueryInfo = subQuery;
}
bool useStatis = sQueryInfo.StatisExpression != null;
bool useNesting = sQueryInfo.HaveDistinct || sQueryInfo.GroupByExpression != null || sQueryInfo.Skip > 0 || sQueryInfo.Take > 0;
string alias0 = token != null && !string.IsNullOrEmpty(token.TableAliasName) ? (token.TableAliasName + "0") : "t0";
// 没有统计函数或者使用 '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
bool useOrderBy = (!useStatis || sQueryInfo.Skip > 0) && !sQueryInfo.HaveAny && (!sQueryInfo.ResultByManyNavigation || (sQueryInfo.Skip > 0 || sQueryInfo.Take > 0));
IDbQueryable dbQueryable = sQueryInfo.SourceQuery;
TableAliasCache aliases = this.PrepareAlias <T>(sQueryInfo, token);
SelectCommand cmd = new SelectCommand(this, aliases, token)
{
HasManyNavigation = sQueryInfo.HasManyNavigation
};
ISqlBuilder jf = cmd.JoinFragment;
ISqlBuilder wf = cmd.WhereFragment;
(jf as OracleSqlBuilder).IsOuter = isOuter;
jf.Indent = indent;
#region 嵌套查询
if (useStatis && useNesting)
{
// SELECT
jf.Append("SELECT ");
jf.AppendNewLine();
// SELECT COUNT(1)
var visitor2 = new StatisExpressionVisitor(this, aliases, sQueryInfo.StatisExpression, sQueryInfo.GroupByExpression, alias0);
visitor2.Write(jf);
cmd.AddNavMembers(visitor2.NavMembers);
// SELECT COUNT(1) FROM
jf.AppendNewLine();
jf.Append("FROM ( ");
indent += 1;
jf.Indent = indent;
(jf as OracleSqlBuilder).IsOuter = false;
}
#endregion
#region 择子句
// SELECT 子句
if (jf.Indent > 0)
{
jf.AppendNewLine();
}
jf.Append("SELECT ");
if (sQueryInfo.HaveAny)
{
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 (useStatis && !useNesting)
{
// 如果有统计函数，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 visitor2 = new StatisExpressionVisitor(this, aliases, sQueryInfo.StatisExpression, sQueryInfo.GroupByExpression);
visitor2.Write(jf);
cmd.AddNavMembers(visitor2.NavMembers);
}
else
{
// DISTINCT 子句
if (sQueryInfo.HaveDistinct)
{
jf.Append("DISTINCT ");
}
#region 择字段
if (!sQueryInfo.HaveAny)
{
// SELECT 范围
ISqlBuilder sf = this.CreateSqlBuilder(token);
sf.Indent = jf.Indent + ((sQueryInfo.Skip > 0 || sQueryInfo.Take > 0) ? 2 : 0);
(sf as OracleSqlBuilder).IsOuter = (sQueryInfo.Skip > 0 || sQueryInfo.Take > 0) ? false : (jf as OracleSqlBuilder).IsOuter;
var visitor2 = new ColumnExpressionVisitor(this, aliases, sQueryInfo);
visitor2.Write(sf);
cmd.Columns = visitor2.Columns;
cmd.Navigations = visitor2.Navigations;
cmd.AddNavMembers(visitor2.NavMembers);
// 分页，产生两层嵌套
if (sQueryInfo.Skip > 0 || sQueryInfo.Take > 0)
{
// 第一层嵌套
int index = 0;
jf.AppendNewLine();
foreach (var entry in cmd.Columns)
{
jf.AppendMember(alias0, entry.Key);
jf.AppendAs(entry.Key);
index += 1;
if (index < cmd.Columns.Count)
{
jf.Append(',');
jf.AppendNewLine();
}
}
jf.AppendNewLine();
jf.Append("FROM(");
// 第二层嵌套
indent += 1;
isOuter = false;
jf.Indent = indent;
(jf as OracleSqlBuilder).IsOuter = isOuter;
jf.AppendNewLine();
jf.Append("SELECT");
jf.AppendNewLine();
foreach (var entry in cmd.Columns)
{
jf.AppendMember(alias0, entry.Key);
jf.AppendAs(entry.Key);
jf.Append(',');
jf.AppendNewLine();
}
jf.Append("ROWNUM AS 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 (sQueryInfo.SubQueryInfo != null)
{
// 子查询
jf.Append('(');
Command cmd2 = this.ParseSelectCommand <T>(sQueryInfo.SubQueryInfo as DbQueryableInfo_Select <T>, indent + 1, false, token);
jf.Append(cmd2.CommandText);
jf.AppendNewLine();
jf.Append(") ");
jf.Append(alias0);
jf.Append(' ');
}
else
{
var typeRuntime = TypeRuntimeInfoCache.GetRuntimeInfo(sQueryInfo.FromType);
jf.AppendMember(typeRuntime.TableName, !typeRuntime.IsTemporary);
jf.Append(' ');
jf.Append(alias0);
jf.Append(' ');
}
// LEFT<INNER> JOIN 子句
ExpressionVisitorBase visitor = new JoinExpressionVisitor(this, aliases, sQueryInfo.Joins);
visitor.Write(jf);
wf.Indent = jf.Indent;
// WHERE 子句
visitor = new WhereExpressionVisitor(this, aliases, sQueryInfo.WhereExpression);
visitor.Write(wf);
cmd.AddNavMembers(visitor.NavMembers);
// GROUP BY 子句
visitor = new GroupByExpressionVisitor(this, aliases, sQueryInfo.GroupByExpression);
visitor.Write(wf);
cmd.AddNavMembers(visitor.NavMembers);
// HAVING 子句
visitor = new HavingExpressionVisitor(this, aliases, sQueryInfo.HavingExpression, sQueryInfo.GroupByExpression);
visitor.Write(wf);
cmd.AddNavMembers(visitor.NavMembers);
// ORDER 子句
if (sQueryInfo.OrderBys.Count > 0 && useOrderBy)
{
visitor = new OrderByExpressionVisitor(this, aliases, sQueryInfo.OrderBys, sQueryInfo.GroupByExpression);
visitor.Write(wf);
cmd.AddNavMembers(visitor.NavMembers);
}
#endregion
#region 嵌套查询
if (useStatis && useNesting)
{
cmd.Convergence();
indent -= 1;
jf.Indent = indent;
jf.AppendNewLine();
jf.Append(") ");
jf.Append(alias0);
}
#endregion
#region 嵌套导航
// TODO Include 从表，没分页，OrderBy 报错
if (sQueryInfo.HasManyNavigation && subQuery != null && subQuery.OrderBys.Count > 0 && subQuery.StatisExpression == null && !(subQuery.Skip > 0 || subQuery.Take > 0))
{
// OrderBy("a.CloudServer.CloudServerName");
cmd.Convergence();
visitor = new OrderByExpressionVisitor(this, aliases, subQuery.OrderBys);//, null, "t0");
visitor.Write(jf);
}
#endregion
#region 并集查询
// UNION 子句
if (sQueryInfo.Unions != null && sQueryInfo.Unions.Count > 0)
{
cmd.Convergence();
for (int index = 0; index < sQueryInfo.Unions.Count; index++)
{
jf.AppendNewLine();
jf.Append("UNION ALL");
if (indent == 0)
{
jf.AppendNewLine();
}
Command cmd2 = this.ParseSelectCommand <T>(sQueryInfo.Unions[index] as DbQueryableInfo_Select <T>, indent, isOuter, token);
jf.Append(cmd2.CommandText);
}
}
#endregion
#region 分页查询
if (sQueryInfo.Take > 0 || sQueryInfo.Skip > 0)
{
// 合并 WHERE
cmd.Convergence();
indent -= 1;
jf.Indent = indent;
jf.AppendNewLine();
jf.Append(") ");
jf.Append(alias0);
indent -= 1;
jf.Indent = indent;
jf.AppendNewLine();
jf.Append(") ");
jf.Append(alias0);
jf.AppendNewLine();
jf.Append("WHERE ");
if (sQueryInfo.Skip > 0)
{
jf.AppendMember(alias0, "Row_Number0");
jf.Append(" > ");
jf.Append(jf.GetSqlValue(sQueryInfo.Skip));
}
if (sQueryInfo.Take > 0)
{
if (sQueryInfo.Skip > 0)
{
jf.Append(" AND ");
}
jf.AppendMember(alias0, "Row_Number0");
jf.Append(" <= ");
jf.Append(jf.GetSqlValue((sQueryInfo.Skip + sQueryInfo.Take)));
}
}
#endregion
#region Any 子句
// 'Any' 子句
if (sQueryInfo.HaveAny)
{
// 产生 WHERE 子句
cmd.Convergence();
// 如果没有分页，则显式指定只查一笔记录
if (sQueryInfo.Take == 0 && sQueryInfo.Skip == 0)
{
if (sQueryInfo.WhereExpression != null && sQueryInfo.WhereExpression.Expressions != null)
{
jf.Append(" AND ROWNUM <= 1");
}
else
{
jf.AppendNewLine();
jf.Append("WHERE ROWNUM <= 1");
}
}
indent -= 1;
jf.Indent = indent;
jf.AppendNewLine();
jf.Append(") ");
jf.Append(alias0);
}
#endregion
return(cmd);
}
// 创建 SELECT 命令
protected override Command ParseSelectCommand <T>(DbQueryableInfo_Select <T> sQueryInfo, int indent, bool isOuter, ParserToken token)
{
// 说明：
// 1.OFFSET 前必须要有 'ORDER BY'，即 'Skip' 子句前必须使用 'OrderBy' 子句
// 2.在有统计函数的<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 subQueryInfo = sQueryInfo.SubQueryInfo as DbQueryableInfo_Select <T>;
if (sQueryInfo.HasManyNavigation && subQueryInfo != null && subQueryInfo.StatisExpression != null)
{
sQueryInfo = subQueryInfo;
}
bool useStatis = sQueryInfo.StatisExpression != null;
// 没有统计函数或者使用 '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
string alias0 = token != null && !string.IsNullOrEmpty(token.TableAliasName) ? (token.TableAliasName + "0") : "t0";
bool useSubQuery = sQueryInfo.HaveDistinct || sQueryInfo.GroupByExpression != null || sQueryInfo.Skip > 0 || sQueryInfo.Take > 0;
bool useOrderBy = (!useStatis || sQueryInfo.Skip > 0) && !sQueryInfo.HaveAny && (!sQueryInfo.ResultByManyNavigation || (sQueryInfo.Skip > 0 || sQueryInfo.Take > 0));
IDbQueryable dbQueryable = sQueryInfo.SourceQuery;
TableAliasCache aliases = this.PrepareAlias <T>(sQueryInfo, token);
SelectCommand cmd = new SelectCommand(this, aliases, token)
{
HasManyNavigation = sQueryInfo.HasManyNavigation
};
ISqlBuilder jf = cmd.JoinFragment;
ISqlBuilder wf = cmd.WhereFragment;
jf.Indent = indent;
#region 嵌套查询
if (useStatis && useSubQuery)
{
// SELECT
jf.Append("SELECT ");
jf.AppendNewLine();
// SELECT COUNT(1)
var visitor2 = new StatisExpressionVisitor(this, aliases, sQueryInfo.StatisExpression, sQueryInfo.GroupByExpression, alias0);
visitor2.Write(jf);
cmd.AddNavMembers(visitor2.NavMembers);
// SELECT COUNT(1) FROM
jf.AppendNewLine();
jf.Append("FROM ( ");
indent += 1;
jf.Indent = indent;
}
#endregion
#region 择子句
// SELECT 子句
if (jf.Indent > 0)
{
jf.AppendNewLine();
}
if (sQueryInfo.HaveAny)
{
jf.Append("IF EXISTS(");
indent += 1;
jf.Indent = indent;
jf.AppendNewLine();
}
jf.Append("SELECT ");
if (useStatis && !useSubQuery)
{
// 如果有统计函数，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 visitor2 = new StatisExpressionVisitor(this, aliases, sQueryInfo.StatisExpression, sQueryInfo.GroupByExpression);
visitor2.Write(jf);
cmd.AddNavMembers(visitor2.NavMembers);
}
else
{
// DISTINCT 子句
if (sQueryInfo.HaveDistinct)
{
jf.Append("DISTINCT ");
}
// TOP 子句
if (sQueryInfo.Take > 0 && sQueryInfo.Skip == 0)
{
jf.AppendFormat("TOP({0})", jf.GetSqlValue(sQueryInfo.Take));
}
// Any
if (sQueryInfo.HaveAny)
{
jf.Append("TOP 1 1");
}
#region 字段
if (!sQueryInfo.HaveAny)
{
// SELECT 范围
var visitor2 = new ColumnExpressionVisitor(this, aliases, sQueryInfo);
visitor2.Write(jf);
cmd.Columns = visitor2.Columns;
cmd.Navigations = visitor2.Navigations;
cmd.AddNavMembers(visitor2.NavMembers);
}
#endregion
}
#endregion
#region 顺序解析
// FROM 子句
jf.AppendNewLine();
jf.Append("FROM ");
if (sQueryInfo.SubQueryInfo != null)
{
// 子查询
jf.Append('(');
Command cmd2 = this.ParseSelectCommand <T>(sQueryInfo.SubQueryInfo as DbQueryableInfo_Select <T>, indent + 1, false, token);
jf.Append(cmd2.CommandText);
jf.AppendNewLine();
jf.Append(") ");
jf.Append(alias0);
jf.Append(' ');
}
else
{
var typeRuntime = TypeRuntimeInfoCache.GetRuntimeInfo(sQueryInfo.FromType);
jf.AppendMember(typeRuntime.TableName, !typeRuntime.IsTemporary);
jf.Append(' ');
jf.Append(alias0);
jf.Append(' ');
SqlDbContext context = (SqlDbContext)dbQueryable.DbContext;
if (context.NoLock && !string.IsNullOrEmpty(this._widthNoLock))
{
jf.Append(this._widthNoLock);
}
}
// LEFT<INNER> JOIN 子句
ExpressionVisitorBase visitor = new JoinExpressionVisitor(this, aliases, sQueryInfo.Joins);
visitor.Write(jf);
wf.Indent = jf.Indent;
// WHERE 子句
visitor = new WhereExpressionVisitor(this, aliases, sQueryInfo.WhereExpression);
visitor.Write(wf);
cmd.AddNavMembers(visitor.NavMembers);
// GROUP BY 子句
visitor = new GroupByExpressionVisitor(this, aliases, sQueryInfo.GroupByExpression);
visitor.Write(wf);
cmd.AddNavMembers(visitor.NavMembers);
// HAVING 子句
visitor = new HavingExpressionVisitor(this, aliases, sQueryInfo.HavingExpression, sQueryInfo.GroupByExpression);
visitor.Write(wf);
cmd.AddNavMembers(visitor.NavMembers);
// ORDER 子句
if (sQueryInfo.OrderBys.Count > 0 && useOrderBy)
{
visitor = new OrderByExpressionVisitor(this, aliases, sQueryInfo.OrderBys, sQueryInfo.GroupByExpression);
visitor.Write(wf);
cmd.AddNavMembers(visitor.NavMembers);
}
#endregion
#region 分页查询
if (sQueryInfo.Skip > 0)
{
if (sQueryInfo.OrderBys.Count == 0)
{
throw new XFrameworkException("The method 'OrderBy' must be called before 'Skip'.");
}
wf.AppendNewLine();
wf.Append("OFFSET ");
wf.Append(wf.GetSqlValue(sQueryInfo.Skip));
wf.Append(" ROWS");
if (sQueryInfo.Take > 0)
{
wf.Append(" FETCH NEXT ");
wf.Append(wf.GetSqlValue(sQueryInfo.Take));
wf.Append(" ROWS ONLY ");
}
}
#endregion
#region 嵌套查询
if (useStatis && useSubQuery)
{
cmd.Convergence();
indent -= 1;
jf.Indent = indent;
jf.AppendNewLine();
jf.Append(") ");
jf.Append(alias0);
jf.Append(' ');
}
#endregion
#region 嵌套导航
if (sQueryInfo.HasManyNavigation && subQueryInfo.StatisExpression == null && subQueryInfo != null && subQueryInfo.OrderBys.Count > 0 && !(subQueryInfo.Skip > 0 || subQueryInfo.Take > 0))
{
// TODO Include 从表，没分页，OrderBy 报错
cmd.Convergence();
visitor = new OrderByExpressionVisitor(this, aliases, subQueryInfo.OrderBys);
visitor.Write(jf);
}
#endregion
#region 并集查询
// UNION 子句
if (sQueryInfo.Unions != null && sQueryInfo.Unions.Count > 0)
{
cmd.Convergence();
for (int index = 0; index < sQueryInfo.Unions.Count; index++)
{
jf.AppendNewLine();
jf.Append("UNION ALL");
if (indent == 0)
{
jf.AppendNewLine();
}
Command cmd2 = this.ParseSelectCommand <T>(sQueryInfo.Unions[index] as DbQueryableInfo_Select <T>, indent, isOuter, token);
jf.Append(cmd2.CommandText);
}
}
#endregion
#region Any 子句
// 'Any' 子句
if (sQueryInfo.HaveAny)
{
cmd.Convergence();
indent -= 1;
jf.Indent = indent;
jf.AppendNewLine();
jf.Append(") SELECT 1 ELSE SELECT 0");
}
#endregion
return(cmd);
}
// 创建 SELECT 命令
Command ParseSelectCommandImpl <T>(DbQueryableInfo_Select <T> sQueryInfo, int indent, bool isOuter, ParserToken token)
{
// 说明：
// 1.OFFSET 前必须要有 'ORDER BY'，即 'Skip' 子句前必须使用 'OrderBy' 子句
// 2.在有统计函数的<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,
DbQueryableInfo_Select <T> subQuery = sQueryInfo.SubQueryInfo as DbQueryableInfo_Select <T>;
if (sQueryInfo.HasManyNavigation && subQuery != null && subQuery.StatisExpression != null)
{
sQueryInfo = subQuery;
}
bool useStatis = sQueryInfo.StatisExpression != null;
// 没有统计函数或者使用 '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
string alias0 = token != null && !string.IsNullOrEmpty(token.TableAliasName) ? (token.TableAliasName + "0") : "t0";
bool useSubQuery = sQueryInfo.HaveDistinct || sQueryInfo.GroupByExpression != null || sQueryInfo.Skip > 0 || sQueryInfo.Take > 0;
bool useOrderBy = (!useStatis || sQueryInfo.Skip > 0) && !sQueryInfo.HaveAny && (!sQueryInfo.ResultByManyNavigation || (sQueryInfo.Skip > 0 || sQueryInfo.Take > 0));
IDbQueryable dbQueryable = sQueryInfo.SourceQuery;
TableAliasCache aliases = this.PrepareAlias <T>(sQueryInfo, token);
SelectCommand cmd = new SelectCommand(this, aliases, token)
{
HasManyNavigation = sQueryInfo.HasManyNavigation
};
ISqlBuilder jf = cmd.JoinFragment;
ISqlBuilder wf = cmd.WhereFragment;
ISqlBuilder sf = null;
jf.Indent = indent;
#region 嵌套查询
if (useStatis && useSubQuery)
{
// SELECT
jf.Append("SELECT ");
jf.AppendNewLine();
// SELECT COUNT(1)
var visitor2 = new StatisExpressionVisitor(this, aliases, sQueryInfo.StatisExpression, sQueryInfo.GroupByExpression, alias0);
visitor2.Write(jf);
cmd.AddNavMembers(visitor2.NavMembers);
// SELECT COUNT(1) FROM
jf.AppendNewLine();
jf.Append("FROM ( ");
indent += 1;
jf.Indent = indent;
}
#endregion
#region 择子句
// SELECT 子句
if (jf.Indent > 0)
{
jf.AppendNewLine();
}
jf.Append("SELECT ");
if (sQueryInfo.HaveAny)
{
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 (useStatis && !useSubQuery)
{
// 如果有统计函数，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 visitor2 = new StatisExpressionVisitor(this, aliases, sQueryInfo.StatisExpression, sQueryInfo.GroupByExpression);
visitor2.Write(jf);
cmd.AddNavMembers(visitor2.NavMembers);
}
else
{
// DISTINCT 子句
if (sQueryInfo.HaveDistinct)
{
jf.Append("DISTINCT ");
}
#region 择字段
if (!sQueryInfo.HaveAny)
{
// SELECT 范围
var visitor2 = new ColumnExpressionVisitor(this, aliases, sQueryInfo);
if (sQueryInfo.Skip > 0 && sQueryInfo.Take == 0)
{
sf = this.CreateSqlBuilder(token);
sf.Indent = jf.Indent + 1;
visitor2.Write(sf);
}
else
{
visitor2.Write(jf);
}
cmd.Columns = visitor2.Columns;
cmd.Navigations = visitor2.Navigations;
cmd.AddNavMembers(visitor2.NavMembers);
if (sf != null)
{
// 第一层嵌套
int index = 0;
jf.AppendNewLine();
foreach (var entry in cmd.Columns)
{
jf.AppendMember(alias0, entry.Key);
jf.AppendAs(entry.Key);
index += 1;
if (index < cmd.Columns.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 (sQueryInfo.OrderBys.Count == 0)
{
throw new XFrameworkException("The method 'OrderBy' must be called before 'Skip'.");
}
jf.Append("ROW_NUMBER() OVER(");
var visitor3 = new OrderByExpressionVisitor(this, aliases, sQueryInfo.OrderBys, sQueryInfo.GroupByExpression);
visitor3.Write(jf, false);
cmd.AddNavMembers(visitor3.NavMembers);
jf.Append(") Row_Number0");
}
}
#endregion
}
#endregion
#region 顺序解析
// FROM 子句
jf.AppendNewLine();
jf.Append("FROM ");
if (sQueryInfo.SubQueryInfo != null)
{
// 子查询
jf.Append("(");
var cmd2 = this.ParseSelectCommandImpl <T>(sQueryInfo.SubQueryInfo as DbQueryableInfo_Select <T>, indent + 1, false, token);
jf.Append(cmd2.CommandText);
jf.AppendNewLine();
jf.Append(") ");
jf.Append(alias0);
jf.Append(' ');
}
else
{
var typeRuntime = TypeRuntimeInfoCache.GetRuntimeInfo(sQueryInfo.FromType);
jf.AppendMember(typeRuntime.TableName, !typeRuntime.IsTemporary);
jf.Append(' ');
jf.Append(alias0);
jf.Append(' ');
}
// LEFT<INNER> JOIN 子句
ExpressionVisitorBase visitor = new JoinExpressionVisitor(this, aliases, sQueryInfo.Joins);
visitor.Write(jf);
wf.Indent = jf.Indent;
// WHERE 子句
visitor = new WhereExpressionVisitor(this, aliases, sQueryInfo.WhereExpression);
visitor.Write(wf);
cmd.AddNavMembers(visitor.NavMembers);
// GROUP BY 子句
visitor = new GroupByExpressionVisitor(this, aliases, sQueryInfo.GroupByExpression);
visitor.Write(wf);
cmd.AddNavMembers(visitor.NavMembers);
// HAVING 子句
visitor = new HavingExpressionVisitor(this, aliases, sQueryInfo.HavingExpression, sQueryInfo.GroupByExpression);
visitor.Write(wf);
cmd.AddNavMembers(visitor.NavMembers);
// ORDER 子句
if (sQueryInfo.OrderBys.Count > 0 && useOrderBy)// && !groupByPaging)
{
visitor = new OrderByExpressionVisitor(this, aliases, sQueryInfo.OrderBys, sQueryInfo.GroupByExpression);
visitor.Write(wf);
cmd.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 (sQueryInfo.Take > 0)
{
wf.AppendNewLine().AppendFormat("LIMIT {0}", wf.GetSqlValue(sQueryInfo.Take));
wf.AppendFormat(" OFFSET {0}", wf.GetSqlValue(sQueryInfo.Skip));
}
#endregion
#region 嵌套查询
if (useStatis && useSubQuery)
{
cmd.Convergence();
indent -= 1;
jf.Indent = indent;
jf.AppendNewLine();
jf.Append(") ");
jf.Append(alias0);
}
#endregion
#region 嵌套导航
// TODO Include 从表，没分页，OrderBy 报错
if (sQueryInfo.HasManyNavigation && subQuery != null && subQuery.OrderBys.Count > 0 && subQuery.StatisExpression == null && !(subQuery.Skip > 0 || subQuery.Take > 0))
{
cmd.Convergence();
visitor = new OrderByExpressionVisitor(this, aliases, subQuery.OrderBys);//, null, "t0");
visitor.Write(jf);
}
#endregion
#region 并集查询
// UNION 子句
if (sQueryInfo.Unions != null && sQueryInfo.Unions.Count > 0)
{
cmd.Convergence();
for (int index = 0; index < sQueryInfo.Unions.Count; index++)
{
jf.AppendNewLine();
jf.Append("UNION ALL");
if (indent == 0)
{
jf.AppendNewLine();
}
Command cmd2 = this.ParseSelectCommandImpl <T>(sQueryInfo.Unions[index] as DbQueryableInfo_Select <T>, indent, isOuter, token);
jf.Append(cmd2.CommandText);
}
}
#endregion
#region 分页查询
if (sf != null)
{
// 合并 WHERE
cmd.Convergence();
indent -= 1;
jf.Indent = indent;
jf.AppendNewLine();
jf.Append(") ");
jf.Append(alias0);
jf.AppendNewLine();
jf.Append("WHERE ");
if (sQueryInfo.Skip > 0)
{
jf.AppendMember(alias0, "Row_Number0");
jf.Append(" > ");
jf.Append(jf.GetSqlValue(sQueryInfo.Skip));
}
}
#endregion
#region Any 子句
// 'Any' 子句
if (sQueryInfo.HaveAny)
{
// 产生 WHERE 子句
cmd.Convergence();
// 如果没有分页，则显式指定只查一笔记录
if (sQueryInfo.Take == 0 && sQueryInfo.Skip == 0)
{
jf.AppendNewLine();
jf.Append("LIMIT 0,1");
}
indent -= 1;
jf.Indent = indent;
jf.AppendNewLine();
jf.Append(") ");
jf.Append(alias0);
}
#endregion
return(cmd);
}
