/// <summary>
/// 创建语句生成上下文。
/// </summary>
/// <param name="operate">操作对象。</param>
/// <param name="generator">值生成对象。</param>
public GenerateContext(DbOperateBase operate, SqlGeneratorBase generator)
{
var operateContext = operate.Executor;
var dataContext = operateContext.Context;
Generator = generator;
_FragmentWriter = generator.FragmentWriter;
var configure = dataContext.Configuration;
Metadata = configure.Metadata;
_Translator = configure.Translator;
Feature = dataContext.Database.Feature;
switch (operate.Type)
{
case EOperateType.InsertObjects:
case EOperateType.InsertPropertys:
Data = new GenerateDataForInsert(this, operate as DbObjectsOperateBase);
break;
case EOperateType.UpdateObjects:
case EOperateType.UpdatePropertys:
Data = new GenerateDataForUpdate(this, operate as DbObjectsOperateBase);
break;
case EOperateType.DeleteObjects:
Data = new GenerateDataForDelete(this, operate as DbObjectsOperateBase);
break;
case EOperateType.AddRelation:
case EOperateType.RemoveRelation:
Data = new GenerateDataForRelation(this, operate as DbRelationOperateBase);
break;
case EOperateType.InsertStatement:
case EOperateType.UpdateStatement:
case EOperateType.DeleteStatement:
Data = new GenerateDataForStatement(this, operate as DbStatementOperateBase);
break;
default:
Data = new GenerateData(this, operate);
break;
}
}
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);
}