/// <summary>
/// 使用重复生成的方式，生成删除多个复合关系对象的语句。
/// </summary>
/// <param name="context">生成上下文。</param>
/// <returns>语句片段。</returns>
protected virtual SqlFragment GenerateForRelationDeleteRepeat(GenerateContext context)
{
var data = (RelationContent)context.Data;
var repeat = new RepeatBlockFragment(context, data.Items, data.CommitObject.Loader);
repeat.Block.Add(GenerateForRelationDelete(context));
return(repeat);
}
/// <summary>
/// 使用重复生成的方式，生成更新多个对象的语句
/// </summary>
/// <param name="context">生成上下文。</param>
/// <param name="content">更新表达式。</param>
/// <returns>语句片段。</returns>
protected virtual SqlFragment GenerateForUpdateRepeat(GenerateContext context, DbExpression content)
{
var data = (GenerateDataForUpdate)context.Data;
var block = (BlockFragment)GenerateForUpdateSingle(context, content);
var repeat = new RepeatBlockFragment(context, data.Items, data.CommitObject.Loader, block);
return(repeat);
}
private SqlFragment GenerateForInsertIdentityMultipleRepeat(GenerateContext context, CommitIdentityUnit mainunit, ColumnMetadata rowindex,
TemporaryTableFragment temporaryTable, RowIndexFragment rowindexfragment, GenerateDataForInsert data, out TableFragment whileTarget)
{
var repeatfragment = new RepeatBlockFragment(context, data.Items);
var block = repeatfragment.Block;
var whileInsert = context.Insert(temporaryTable, mainunit.Table,
mainunit.Members.Where(a => a.ValueType != ECommitValueType.Database).Select(a => a.Metadata));
var whileSelect = (QueryBaseFragment)whileInsert.Query;
whileSelect.Where = context.Equal(temporaryTable.GetMember(rowindex), new RowIndexFragment(context));
block.Add(whileInsert);
var whileUpdate = new UpdateFragment(context, temporaryTable);
var getidentity = whileUpdate.CreateExpression(
context.Translate(Expression.Call(null, SupportMembers.DbFunctions.GetIdentity)));
whileUpdate.SetValue(mainunit.Identity.Metadata, getidentity);
whileUpdate.Where = context.Equal(temporaryTable.GetMember(rowindex), new RowIndexFragment(context));
block.Add(whileUpdate);
whileTarget = (TableFragment)whileInsert.Target;
return(repeatfragment);
}
