/// <summary>
/// 构造一个属性与指定值"相等"的约束条件节点。
/// </summary>
/// <param name="column">要对比的属性。</param>
/// <param name="value">要对比的值。</param>
/// <returns></returns>
public IConstraint Constraint(
IColumnNode column,
object value
)
{
return(Constraint(column, PropertyOperator.Equal, value));
}
/// <summary>
/// 构造一个两个属性"相等"的约束条件节点。
/// </summary>
/// <param name="leftColumn">第一个需要对比的列。</param>
/// <param name="rightColumn">第二个需要对比的列。</param>
/// <returns></returns>
public IConstraint Constraint(
IColumnNode leftColumn,
IColumnNode rightColumn
)
{
return(Constraint(leftColumn, PropertyOperator.Equal, rightColumn));
}
public static IConstraint NotIn(this IColumnNode column, object value)
{
var parameters = value as IList;
IConstraint res = null;
//处理大数目NotIn 条件
var maxItemsCount = SqlGenerator.CampatibleMaxItemsInInClause;
if (parameters != null && parameters.Count > maxItemsCount)
{
var start = 0;
while (start < parameters.Count)
{
var paramSection = new List <object>(maxItemsCount);
var end = Math.Min(start + maxItemsCount - 1, parameters.Count - 1);
for (int i = start; i <= end; i++)
{
paramSection.Add(parameters[i]);
}
var sectionConstraint = QueryFactory.Instance.Constraint(column, PropertyOperator.NotIn, paramSection);
res = QueryFactory.Instance.And(res, sectionConstraint);
start += paramSection.Count;
}
}
else
{
res = QueryFactory.Instance.Constraint(column, PropertyOperator.NotIn, value);
}
return(res);
}
/// <summary>
/// 添加列节点
/// </summary>
/// <param name="columnNode">列节点</param>
public void Add(IColumnNode columnNode)
{
if (_columnNodes.Count(n => n.ColumnName.Equals(columnNode.ColumnName)) == 0)
{
_columnNodes.Add(columnNode);
}
}
/// <summary>
/// 构造一个排序节点并添加到当前集合中。。
/// </summary>
/// <param name="orderByList">实例.</param>
/// <param name="property">使用这个属性进行排序。</param>
/// <param name="direction">使用这个方向进行排序。</param>
/// <returns></returns>
public static IOrderBy Add(this ICollection <IOrderBy> orderByList, IColumnNode property, OrderDirection direction = OrderDirection.Ascending)
{
var item = QueryFactory.Instance.OrderBy(property, direction);
orderByList.Add(item);
return(item);
}
public void Parse(string filter, IQuery query)
{
_query = query;
_mainTable = query.MainTable;
_column = null;
_comparison = null;
_concat = null;
_current = null;
_f = QueryFactory.Instance;
_bracketStack = new Stack <StackItem>();
_filter = filter;
_filterIndex = 0;
while (true)
{
var part = this.ReadPart();
if (part == string.Empty)
{
break;
}
this.DealPart(part);
}
query.Where = _current;
}
/// <summary>
/// 构造一个属性的约束条件节点。
/// </summary>
/// <param name="column">要对比的属性。</param>
/// <param name="op">对比操作符</param>
/// <param name="value">要对比的值。</param>
/// <returns></returns>
public IConstraint Constraint(
IColumnNode column,
PropertyOperator op,
object value
)
{
IColumnConstraint res = new Impl.ColumnConstraint();
res.Column = column;
res.Operator = op;
res.Value = value;
return(res);
}
/// <summary>
/// 构造一个排序节点。
/// </summary>
/// <param name="property">使用这个属性进行排序。</param>
/// <param name="direction">使用这个方向进行排序。</param>
/// <returns></returns>
/// <exception cref="System.ArgumentNullException">property</exception>
public IOrderBy OrderBy(IColumnNode property, OrderDirection direction = OrderDirection.Ascending)
{
if (property == null)
{
throw new ArgumentNullException("property");
}
IOrderBy res = new Impl.OrderBy();
res.Column = property;
res.Direction = direction;
return(res);
}
IColumnNode ISubQuery.Column(IColumnNode rawProperty)
{
var raw = rawProperty as ColumnNode;
var property = new ColumnNode
{
ColumnName = raw.ColumnName,
Property = raw.Property,
Table = this,
};
return(property);
}
private void VisitValueProperty(IManagedProperty mp, ITableSource mpOwnerTable)
{
//如果已经记录了条件的属性，那么当前的 mp 就是用于对比的第二个属性。（A.Code = A.Name 中的 Name）
if (_propertyResult != null)
{
_rightPropertyResult = mpOwnerTable.Column(mp);
}
//如果还没有记录属性，说明当前条件要比较的属性就是 mp；(A.Code = 1 中的 Code）
else
{
_propertyResult = mpOwnerTable.Column(mp);
}
}
IColumnNode ISubQuery.Column(IColumnNode rawProperty)
{
var raw = rawProperty as ColumnNode;
var property = new ColumnNode
{
ColumnName = raw.ColumnName,
Property = raw.Property,
Table = this,
};
return property;
}
/// <summary>
/// 通过目前已经收集到的属性、操作符、值，来生成一个属性条件结果。
/// 并清空已经收集的信息。
/// </summary>
private void MakeConstraint()
{
if (_propertyResult != null && _operator.HasValue)
{
if (_hasValueResult)
{
_query.Where = f.Constraint(_propertyResult, _operator.Value, _valueResult);
_hasValueResult = false;
}
else
{
_query.Where = f.Constraint(_propertyResult, _operator.Value, _rightPropertyResult);
_rightPropertyResult = null;
}
_propertyResult = null;
_operator = null;
}
}
private void VisitValueProperty(IManagedProperty mp, ITableSource mpOwnerTable)
{
//接下来，是一般属性的处理
if (_visitRefProperties)
{
throw OperationNotSupported(string.Format("不支持使用属性：{0}。这是因为它的拥有者是一个值属性，值属性只支持直接对比。", mp.Name));
}
//如果已经记录了条件的属性，那么当前的 mp 就是用于对比的第二个属性。（A.Code = A.Name 中的 Name）
if (_propertyResult != null)
{
_rightPropertyResult = mpOwnerTable.Column(mp);
}
//如果还没有记录属性，说明当前条件要比较的属性就是 mp；(A.Code = 1 中的 Code）
else
{
_propertyResult = mpOwnerTable.Column(mp);
}
}
/// <summary>
/// 通过目前已经收集到的属性、操作符、值，来生成一个属性条件结果。
/// 并清空已经收集的信息。
/// </summary>
private bool MakeConstraint()
{
if (_propertyResult != null && _operator.HasValue)
{
var op = _operator.Value;
if (_reverseWhere)
{
op = PropertyOperatorHelper.Reverse(op);
}
if (_hasValueResult)
{
_constraintResult = f.Constraint(_propertyResult, op, _valueResult);
_valueResult = null;
_hasValueResult = false;
}
else
{
_constraintResult = f.Constraint(_propertyResult, op, _rightPropertyResult);
_rightPropertyResult = null;
}
_propertyResult = null;
_operator = null;
}
if (_constraintResult != null)
{
if (_nullableRefConstraint != null)
{
var concat = _reverseWhere ? BinaryOperator.Or : BinaryOperator.And;
_constraintResult = f.Binary(_nullableRefConstraint, concat, _constraintResult);
_nullableRefConstraint = null;
}
_query.Where = _constraintResult;
_constraintResult = null;
return(true);
}
return(false);
}
/// <summary>
/// 拼接列
/// </summary>
/// <param name="commandText">待拼接的sql</param>
/// <param name="columnNode">列</param>
protected virtual void AppendColumn(StringBuilder commandText, IColumnNode columnNode)
{
//拼接列名
this.AppendColumnName(commandText, columnNode.ColumnName);
//拼接数据类型
commandText.AppendFormat("\t{0}", _columnNodeHelper.GetSqlType(columnNode.DataType));
//拼接数据类型长度及小数点位数
if (columnNode.Length != null && columnNode.Decimals != null)
{
commandText.AppendFormat("({0}, {1})", columnNode.Length, columnNode.Decimals);
}
else if (columnNode.Length != null)
{
commandText.AppendFormat("({0})", columnNode.Length);
}
//拼接默认值
if (columnNode.IsDefault)
{
string defaultValue = _columnNodeHelper.GetDefaultValue(columnNode.DataType);
if (!string.IsNullOrEmpty(defaultValue))
{
commandText.AppendFormat("\tDEFAULT {0}", defaultValue);
}
}
//拼接主键
if (columnNode.IsPrimary)
{
commandText.Append("\tPRIMARY KEY");
}
//拼接自增列
if (columnNode.IsIdentity)
{
commandText.AppendFormat("\t{0}", _columnNodeHelper.GetIdentity());
}
//拼接是否为空(非主键列才可以定义NULL 或 NOT NULL)
if (!columnNode.IsPrimary)
{
commandText.AppendFormat("\t{0}", columnNode.IsNull ? "NULL" : "NOT NULL");
}
}
/// <summary>
/// 构造一个两个属性进行对比的约束条件节点。
/// </summary>
/// <param name="leftColumn">第一个需要对比的列。</param>
/// <param name="op">对比条件。</param>
/// <param name="rightColumn">第二个需要对比的列。</param>
/// <returns></returns>
/// <exception cref="System.ArgumentNullException">
/// leftProperty
/// or
/// rightProperty
/// </exception>
public IConstraint Constraint(
IColumnNode leftColumn,
PropertyOperator op,
IColumnNode rightColumn
)
{
if (leftColumn == null)
{
throw new ArgumentNullException("leftProperty");
}
if (rightColumn == null)
{
throw new ArgumentNullException("rightProperty");
}
IColumnsComparison res = new Impl.ColumnsComparison();
res.LeftColumn = leftColumn;
res.RightColumn = rightColumn;
res.Operator = op;
return(res);
}
public void Parse(string filter, IQuery query)
{
_query = query;
_mainTable = query.MainTable;
_column = null;
_comparison = null;
_concat = null;
_current = null;
_f = QueryFactory.Instance;
_bracketStack = new Stack<StackItem>();
using (_reader = new StringReader(filter))
{
while (true)
{
var part = this.ReadPart();
if (part == string.Empty) break;
this.DealPart(part);
}
}
query.Where = _current;
}
/// <summary>
/// Copies all properties from <paramref name="columnDefinition"/> to appropriate <see cref="IAstNodeProperty"/>
/// objects and adds them to <paramref name="columnNode"/>.
/// </summary>
/// <param name="columnDefinition"></param>
/// <param name="columnNode"></param>
public static void CopyProperties(IColumnDefinition columnDefinition, IColumnNode columnNode)
{
if(columnDefinition.Type != null)
AddProperty(columnNode, MdlSyntax.Type, columnDefinition.Type.Value.ToString());
if(columnDefinition.Nullable.HasValue)
AddProperty(columnNode, MdlSyntax.Nullable, columnDefinition.Nullable.Value.ToString().ToLower());
if(columnDefinition.Length.HasValue)
AddProperty(columnNode, MdlSyntax.Length, columnDefinition.Length.Value);
if(columnDefinition.Precision.HasValue)
AddProperty(columnNode, MdlSyntax.Precision, columnDefinition.Precision.Value);
if(columnDefinition.Scale.HasValue)
AddProperty(columnNode, MdlSyntax.Scale, columnDefinition.Scale.Value);
if(columnDefinition.PrimaryKey.GetValueOrDefault(false))
AddProperty(columnNode, MdlSyntax.PrimaryKey, "true");
if(columnDefinition.Identity.GetValueOrDefault(false))
AddProperty(columnNode, MdlSyntax.Identity, "true");
}
public static IConstraint EndWith(this IColumnNode column, IColumnNode rightColumn)
{
return(QueryFactory.Instance.Constraint(column, PropertyOperator.EndsWith, rightColumn));
}
public static IConstraint LessEqual(this IColumnNode column, IColumnNode rightColumn)
{
return(QueryFactory.Instance.Constraint(column, PropertyOperator.LessEqual, rightColumn));
}
public static IConstraint Greater(this IColumnNode column, IColumnNode rightColumn)
{
return QueryFactory.Instance.Constraint(column, PropertyOperator.Greater, rightColumn);
}
public static IConstraint NotEndWith(this IColumnNode column, object value)
{
return(QueryFactory.Instance.Constraint(column, PropertyOperator.NotEndsWith, value));
}
public static IConstraint Contains(this IColumnNode column, object value)
{
return(QueryFactory.Instance.Constraint(column, PropertyOperator.Contains, value));
}
public static IConstraint LessEqual(this IColumnNode column, object value)
{
return(QueryFactory.Instance.Constraint(column, PropertyOperator.LessEqual, value));
}
private void VisitValueProperty(IManagedProperty mp, ITableSource mpOwnerTable)
{
//如果已经记录了条件的属性，那么当前的 mp 就是用于对比的第二个属性。（A.Code = A.Name 中的 Name）
if (_propertyResult != null)
{
_rightPropertyResult = mpOwnerTable.Column(mp);
}
//如果还没有记录属性，说明当前条件要比较的属性就是 mp；(A.Code = 1 中的 Code）
else
{
_propertyResult = mpOwnerTable.Column(mp);
}
}
private bool VisitMethod_Queryable(MethodCallExpression exp)
{
var args = exp.Arguments;
if (args.Count == 2)
{
this.Visit(args[0]);//visit queryable
var lambda = StripQuotes(args[1]) as LambdaExpression;
var previousWhere = _query.Where;
this.Visit(lambda.Body);
switch (exp.Method.Name)
{
case LinqConsts.QueryableMethod_Where:
//如果现在不是第一次调用 Where 方法，那么需要把本次的约束和之前的约束进行 And 合并。
this.MakeBooleanConstraintIfNoValue();
if (_query.Where != null && previousWhere != null)
{
_query.Where = f.And(previousWhere, _query.Where);
}
break;
case LinqConsts.QueryableMethod_OrderBy:
case LinqConsts.QueryableMethod_ThenBy:
if (_propertyResult != null)
{
(_query as TableQuery).OrderBy.Add(f.OrderBy(_propertyResult) as OrderBy);
_propertyResult = null;
}
break;
case LinqConsts.QueryableMethod_OrderByDescending:
case LinqConsts.QueryableMethod_ThenByDescending:
if (_propertyResult != null)
{
(_query as TableQuery).OrderBy.Add(f.OrderBy(_propertyResult, OrderDirection.Descending) as OrderBy);
_propertyResult = null;
}
break;
default:
break;
}
return true;
}
return false;
}
private void DealConstraintWord(string part)
{
//part 表示列名
if (_column == null)
{
//可能使用了引用属性，例如表达式：User.Name eq 'huqf'
var properties = part.Split(new char[] { '.' }, StringSplitOptions.RemoveEmptyEntries);
if (properties.Length > 1)
{
ITableSource lastTable = _mainTable;
for (int i = 0; i < properties.Length; i++)
{
var property = properties[i];
var mp = lastTable.EntityRepository.EntityMeta.ManagedProperties.GetCompiledProperties().Find(property);
if (mp == null) throw new InvalidProgramException(string.Format("查询条件解析出错，没有找到名称为 {0} 的属性。", property));
var refProperty = mp as IRefEntityProperty;
if (refProperty != null)
{
lastTable = _f.FindOrCreateJoinTable(_query, lastTable, refProperty);
}
else
{
_column = lastTable.Column(mp);
}
}
if (_column == null) { throw new InvalidProgramException(string.Format("{0} 查询条件出错：属性表达式不能以引用实体属性结尾。", part)); }
}
else
{
var mp = _properties.Find(part, true);
if (mp == null) throw new InvalidProgramException(string.Format("查询条件解析出错，没有找到名称为 {0} 的属性。", part));
_column = _mainTable.Column(mp);
}
}
//part 表示操作符
else if (_comparison == null)
{
_comparison = part;
}
//part 表示值
else
{
var propertyConstraint = CreateColumnConstraint(_comparison, part);
if (_concat.HasValue && _current != null)
{
_current = _f.Binary(_current, _concat.Value, propertyConstraint);
_concat = null;
}
else
{
_current = propertyConstraint;
}
_column = null;
_comparison = null;
}
}
public static IConstraint NotIn(this IColumnNode column, IColumnNode rightColumn)
{
return(QueryFactory.Instance.Constraint(column, PropertyOperator.NotIn, rightColumn));
}
public static IConstraint LessEqual(this IColumnNode column, IColumnNode rightColumn)
{
return QueryFactory.Instance.Constraint(column, PropertyOperator.LessEqual, rightColumn);
}
public static IConstraint NotLike(this IColumnNode column, IColumnNode rightColumn)
{
return QueryFactory.Instance.Constraint(column, PropertyOperator.NotLike, rightColumn);
}
public static IConstraint StartWith(this IColumnNode column, IColumnNode rightColumn)
{
return QueryFactory.Instance.Constraint(column, PropertyOperator.StartsWith, rightColumn);
}
protected virtual IColumnNode VisitProperty(IColumnNode node)
{
return node;
}
private void DealConstraintWord(string part)
{
//part 表示列名
if (_column == null)
{
//可能使用了引用属性，例如表达式：User.Name eq 'huqf'
var properties = part.Split(new char[] { '.' }, StringSplitOptions.RemoveEmptyEntries);
if (properties.Length > 1)
{
ITableSource lastTable = _mainTable;
for (int i = 0; i < properties.Length; i++)
{
var property = properties[i];
var mp = lastTable.EntityRepository.EntityMeta.ManagedProperties.GetCompiledProperties().Find(property);
if (mp == null)
{
throw new InvalidProgramException(string.Format("查询条件解析出错，没有找到名称为 {0} 的属性。", property));
}
var refProperty = mp as IRefEntityProperty;
if (refProperty != null)
{
lastTable = _f.FindOrCreateJoinTable(_query, lastTable, refProperty);
}
else
{
_column = lastTable.Column(mp);
}
}
if (_column == null)
{
throw new InvalidProgramException(string.Format("{0} 查询条件出错：属性表达式不能以引用实体属性结尾。", part));
}
}
else
{
var mp = _properties.Find(part, true);
if (mp == null)
{
throw new InvalidProgramException(string.Format("查询条件解析出错，没有找到名称为 {0} 的属性。", part));
}
_column = _mainTable.Column(mp);
}
}
//part 表示操作符
else if (_comparison == null)
{
_comparison = part;
}
//part 表示值
else
{
var propertyConstraint = CreateColumnConstraint(_comparison, part);
if (_concat.HasValue && _current != null)
{
_current = _f.Binary(_current, _concat.Value, propertyConstraint);
_concat = null;
}
else
{
_current = propertyConstraint;
}
_column = null;
_comparison = null;
}
}
protected virtual IColumnNode VisitProperty(IColumnNode node)
{
return(node);
}
IColumnNode ISubQuery.Column(IColumnNode rawProperty, string alias)
{
var raw = rawProperty as ColumnNode;
var property = new ColumnNode
{
ColumnName = raw.ColumnName,
Property = raw.Property,
Table = this,
Alias = alias
};
return property;
}
/// <summary>
/// 通过目前已经收集到的属性、操作符、值，来生成一个属性条件结果。
/// 并清空已经收集的信息。
/// </summary>
private bool MakeConstraint()
{
if (_propertyResult != null && _operator.HasValue)
{
var op = _operator.Value;
if (_reverseWhere) op = PropertyOperatorHelper.Reverse(op);
if (_hasValueResult)
{
_constraintResult = f.Constraint(_propertyResult, op, _valueResult);
_valueResult = null;
_hasValueResult = false;
}
else
{
_constraintResult = f.Constraint(_propertyResult, op, _rightPropertyResult);
_rightPropertyResult = null;
}
_propertyResult = null;
_operator = null;
}
if (_constraintResult != null)
{
if (_nullableRefConstraint != null)
{
var concat = _reverseWhere ? BinaryOperator.Or : BinaryOperator.And;
_constraintResult = f.Binary(_nullableRefConstraint, concat, _constraintResult);
_nullableRefConstraint = null;
}
_query.Where = _constraintResult;
_constraintResult = null;
return true;
}
return false;
}
private static void BindColumnProperties(IColumnNode columnNode, IColumnDefinition columnDefinition)
{
if(columnNode.Properties[MdlSyntax.PrimaryKey] != null)
columnNode.PrimaryKey = columnDefinition.PrimaryKey =
columnNode.Properties.AsBoolean(MdlSyntax.PrimaryKey);
if (columnNode.Properties[MdlSyntax.Nullable] != null)
columnNode.Nullable = columnDefinition.Nullable =
columnNode.Properties.AsBoolean(MdlSyntax.Nullable);
if (columnNode.Properties[MdlSyntax.Length] != null)
columnNode.Length = columnDefinition.Length =
AstNodePropertyUtil.AsInteger(columnNode.Properties, MdlSyntax.Length);
//
// Type aliases have already been resolved, so we can freely parse textual type representation.
if(columnNode.Properties[MdlSyntax.Type] != null)
{
string textualType = AstNodePropertyUtil.AsString(columnNode.Properties, MdlSyntax.Type);
try
{
columnNode.Type = columnDefinition.Type =
(DbType)Enum.Parse(typeof(DbType), textualType, true);
} // try
catch(ArgumentException e)
{
throw new MdlCompilerException(string.Format(MdlCompilerResources.UnknownType, textualType), e);
} // catch
} // if
if(columnNode.Properties[MdlSyntax.Scale] != null)
columnNode.Scale = columnDefinition.Scale =
AstNodePropertyUtil.AsInteger(columnNode.Properties, MdlSyntax.Scale);
if(columnNode.Properties[MdlSyntax.Precision] != null)
columnNode.Precision = columnDefinition.Precision =
AstNodePropertyUtil.AsInteger(columnNode.Properties, MdlSyntax.Precision);
if(columnNode.Properties[MdlSyntax.Identity] != null)
columnNode.Identity = columnDefinition.Identity =
Convert.ToBoolean(AstNodePropertyUtil.AsString(columnNode.Properties, MdlSyntax.Identity));
if(columnNode.Properties[MdlSyntax.Table] != null)
columnNode.Table = columnDefinition.Table =
AstNodePropertyUtil.AsString(columnNode.Properties, MdlSyntax.Table);
}
