/// <summary>
/// 构造左连接SQL
/// </summary>
/// <param name="sql">Select语句</param>
/// <param name="association">关联</param>
private void BuildLeftJoin(SelectSqlStatement sql, InternalAssociation association, SqlBuildingContext context)
{
LeftJoinItem leftJoin = new LeftJoinItem();
leftJoin.LeftJoinTable = association.LocatedTable;
foreach (var item in association.Association.Items)
{
SqlTable srcElelemtTable = association.LocatedTable;
var srcElement = association.LocatedNode.Elements.FirstOrDefault(i => i.ID == item.SourceElementID);
var targetElement = association.AssociatedCoNode.Elements.FirstOrDefault(i => i.ID == item.TargetElementID);
var leftCol = association.LocatedDataObject.Columns.FirstOrDefault(i => i.ID == srcElement.DataColumnID);
var rightCol = association.AssociatedDataObject.Columns.FirstOrDefault(i => i.ID == targetElement.DataColumnID);
JoinConditionItem joinItem = new JoinConditionItem();
joinItem.LeftField.Table = srcElelemtTable;
joinItem.LeftField.FieldName = leftCol.ColumnName;
joinItem.LeftField.IsUseFieldPrefix = true;
joinItem.RightField.Table = association.AssociatedTable;
joinItem.RightField.FieldName = rightCol.ColumnName;
joinItem.RightField.IsUseFieldPrefix = true;
leftJoin.ChildCollection.Add(joinItem);
}
//关联上的条件
leftJoin.AdditionalCondition = this.ParseCondition(association);
sql.MainFromItem.ChildCollection.Add(leftJoin);
}
public override void ToXml(SqlElement sqlElement, XmlElement xmlParent)
{
base.ToXml(sqlElement, xmlParent);
LeftJoinItem leftJoinItem = sqlElement as LeftJoinItem;
XmlElement xmlLeftJoinTable = SerializerUtil.AddElement(xmlParent, LEFTJOINTABLE);
leftJoinItem.LeftJoinTable.ToXml(leftJoinItem.LeftJoinTable, xmlLeftJoinTable);
XmlElement xmlAddtionalCondition = SerializerUtil.AddElement(xmlParent, ADDITIONALCONDITION, leftJoinItem.AdditionalCondition);
}
public override void FromXml(SqlElement sqlElement, XmlElement xmlParent, XmlNamespaceManager xnm)
{
base.FromXml(sqlElement, xmlParent, xnm);
LeftJoinItem leftJoinItem = sqlElement as LeftJoinItem;
ParserUtil util = new ParserUtil(xnm);
XmlElement xmlLeftJoinTable = util.Child(xmlParent, LEFTJOINTABLE);
leftJoinItem.LeftJoinTable.FromXml(leftJoinItem.LeftJoinTable, xmlLeftJoinTable, xnm);
XmlElement xmlAddtionalCondition = util.Child(xmlParent, ADDITIONALCONDITION);
leftJoinItem.AdditionalCondition = xmlAddtionalCondition.InnerText;
}
