protected override void VisitTwoPropertiesComparison(TwoPropertiesConstraint node)
{
var leftTable = Query.From.FindTable(node.LeftPropertyOwner ?? node.LeftProperty.OwnerType);
var rightTable = Query.From.FindTable(node.RightPropertyOwner ?? node.RightProperty.OwnerType);
_whereResult = f.Constraint(
leftTable.Column(node.LeftProperty),
ConvertOperator(node.Operator),
rightTable.Column(node.RightProperty)
);
}
protected override void VisitTwoPropertiesComparison(TwoPropertiesConstraint node)
{
var leftTable = Query.From.FindTable(node.LeftPropertyOwner ?? node.LeftProperty.OwnerType);
var rightTable = Query.From.FindTable(node.RightPropertyOwner ?? node.RightProperty.OwnerType);
_whereResult = f.Constraint(
leftTable.Column(node.LeftProperty),
ConvertOperator(node.Operator),
rightTable.Column(node.RightProperty)
);
}
private void AddConstraint(PropertyCompareOperator op, IManagedProperty property, Type propertyOwner = null)
{
if (_pending == null)
{
throw new InvalidOperationException("查询构造出错：你必须先调用方法 Constrain。");
}
//如果没有指定属性对应的实体类型，则使用当前仓库对应的实体来作为属性的拥有者。
var leftPropertyOwner = _pendingOwner;
if (leftPropertyOwner == null)
{
leftPropertyOwner = _pending.OwnerType;
if (_repo.EntityType.IsSubclassOf(leftPropertyOwner))
{
leftPropertyOwner = _repo.EntityType;
}
}
var constraint = new TwoPropertiesConstraint
{
Context = this,
LeftProperty = _pending,
LeftPropertyOwner = leftPropertyOwner,
Operator = op,
RightProperty = property,
RightPropertyOwner = propertyOwner
};
this.AddConstraint(constraint);
_pending = null;
_pendingOwner = null;
}
protected virtual void VisitTwoPropertiesComparison(TwoPropertiesConstraint node)
{
}
protected virtual void VisitTwoPropertiesComparison(TwoPropertiesConstraint node)
{
}
