protected override IBuildContext BuildMethodCall(ExpressionBuilder builder, MethodCallExpression methodCall, BuildInfo buildInfo)
{
var sequence = builder.BuildSequence(new BuildInfo(buildInfo, methodCall.Arguments[0]));
var isSubQuery = sequence.SelectQuery.Select.IsDistinct;
if (isSubQuery)
{
sequence = new SubQueryContext(sequence);
}
if (!(sequence.Statement is SqlInsertStatement insertStatement))
{
insertStatement = new SqlInsertStatement(sequence.SelectQuery);
sequence.Statement = insertStatement;
}
var insertType = InsertContext.InsertType.Insert;
switch (methodCall.Method.Name)
{
case "Insert": insertType = InsertContext.InsertType.Insert; break;
case "InsertWithIdentity": insertType = InsertContext.InsertType.InsertWithIdentity; break;
case "InsertWithOutput": insertType = InsertContext.InsertType.InsertOutput; break;
case "InsertWithOutputInto": insertType = InsertContext.InsertType.InsertOutputInto; break;
}
var indexedParameters
= methodCall.Method.GetParameters().Select((p, i) => Tuple.Create(p, i)).ToDictionary(t => t.Item1.Name, t => t.Item2);
Expression GetArgumentByName(string name)
{
return(methodCall.Arguments[indexedParameters[name]]);
}
LambdaExpression GetOutputExpression(Type outputType)
{
if (!indexedParameters.TryGetValue("outputExpression", out var index))
{
var param = Expression.Parameter(outputType);
return(Expression.Lambda(param, param));
}
return((LambdaExpression)methodCall.Arguments[index].Unwrap());
}
IBuildContext? outputContext = null;
LambdaExpression?outputExpression = null;
if (methodCall.Arguments.Count > 0)
{
var argument = methodCall.Arguments[0];
if (typeof(IValueInsertable <>).IsSameOrParentOf(argument.Type) ||
typeof(ISelectInsertable <,>).IsSameOrParentOf(argument.Type))
{
// static int Insert<T> (this IValueInsertable<T> source)
// static int Insert<TSource,TTarget>(this ISelectInsertable<TSource,TTarget> source)
sequence.SelectQuery.Select.Columns.Clear();
foreach (var item in insertStatement.Insert.Items)
{
sequence.SelectQuery.Select.ExprNew(item.Expression !);
}
}
else if (methodCall.Arguments.Count > 1 &&
typeof(IQueryable <>).IsSameOrParentOf(argument.Type) &&
typeof(ITable <>).IsSameOrParentOf(methodCall.Arguments[1].Type))
{
// static int Insert<TSource,TTarget>(this IQueryable<TSource> source, Table<TTarget> target, Expression<Func<TSource,TTarget>> setter)
var into = builder.BuildSequence(new BuildInfo(buildInfo, methodCall.Arguments[1], new SelectQuery()));
var setter = (LambdaExpression)GetArgumentByName("setter").Unwrap();
UpdateBuilder.BuildSetter(
builder,
buildInfo,
setter,
into,
insertStatement.Insert.Items,
sequence);
sequence.SelectQuery.Select.Columns.Clear();
foreach (var item in insertStatement.Insert.Items)
{
sequence.SelectQuery.Select.Columns.Add(new SqlColumn(sequence.SelectQuery, item.Expression !));
}
insertStatement.Insert.Into = ((TableBuilder.TableContext)into).SqlTable;
}
else if (typeof(ITable <>).IsSameOrParentOf(argument.Type))
{
// static int Insert<T>(this Table<T> target, Expression<Func<T>> setter)
// static TTarget InsertWithOutput<TTarget>(this ITable<TTarget> target, Expression<Func<TTarget>> setter)
// static TTarget InsertWithOutput<TTarget>(this ITable<TTarget> target, Expression<Func<TTarget>> setter, Expression<Func<TTarget,TOutput>> outputExpression)
var argIndex = 1;
var arg = methodCall.Arguments[argIndex].Unwrap();
LambdaExpression?setter = null;
switch (arg)
{
case LambdaExpression lambda:
{
setter = lambda;
UpdateBuilder.BuildSetter(
builder,
buildInfo,
setter,
sequence,
insertStatement.Insert.Items,
sequence);
break;
}
default:
{
var objType = arg.Type;
var ed = builder.MappingSchema.GetEntityDescriptor(objType);
var into = sequence;
var ctx = new TableBuilder.TableContext(builder, buildInfo, objType);
var table = new SqlTable(objType);
foreach (ColumnDescriptor c in ed.Columns.Where(c => !c.SkipOnInsert))
{
if (!table.Fields.TryGetValue(c.ColumnName, out var field))
{
continue;
}
var pe = Expression.MakeMemberAccess(arg, c.MemberInfo);
var column = into.ConvertToSql(pe, 1, ConvertFlags.Field);
var parameter = builder.BuildParameterFromArgumentProperty(methodCall, argIndex, field.ColumnDescriptor);
insertStatement.Insert.Items.Add(new SqlSetExpression(column[0].Sql, parameter.SqlParameter));
}
var insertedTable = SqlTable.Inserted(methodCall.Method.GetGenericArguments()[0]);
break;
}
}
insertStatement.Insert.Into = ((TableBuilder.TableContext)sequence).SqlTable;
sequence.SelectQuery.From.Tables.Clear();
}
if (insertType == InsertContext.InsertType.InsertOutput || insertType == InsertContext.InsertType.InsertOutputInto)
{
outputExpression = GetOutputExpression(methodCall.Method.GetGenericArguments().Last());
insertStatement.Output = new SqlOutputClause();
var insertedTable = SqlTable.Inserted(outputExpression.Parameters[0].Type);
outputContext = new TableBuilder.TableContext(builder, new SelectQuery(), insertedTable);
insertStatement.Output.InsertedTable = insertedTable;
if (insertType == InsertContext.InsertType.InsertOutputInto)
{
var outputTable = GetArgumentByName("outputTable");
var destination = builder.BuildSequence(new BuildInfo(buildInfo, outputTable, new SelectQuery()));
UpdateBuilder.BuildSetter(
builder,
buildInfo,
outputExpression,
destination,
insertStatement.Output.OutputItems,
outputContext);
insertStatement.Output.OutputTable = ((TableBuilder.TableContext)destination).SqlTable;
}
}
}
var insert = insertStatement.Insert;
var q = insert.Into !.Fields.Values
.Except(insert.Items.Select(e => e.Column))
.OfType <SqlField>()
.Where(f => f.IsIdentity);
foreach (var field in q)
{
var expr = builder.DataContext.CreateSqlProvider().GetIdentityExpression(insert.Into);
if (expr != null)
{
insert.Items.Insert(0, new SqlSetExpression(field, expr));
if (methodCall.Arguments.Count == 3)
{
sequence.SelectQuery.Select.Columns.Insert(0, new SqlColumn(sequence.SelectQuery, insert.Items[0].Expression !));
}
}
}
insertStatement.Insert.WithIdentity = insertType == InsertContext.InsertType.InsertWithIdentity;
sequence.Statement = insertStatement;
if (insertType == InsertContext.InsertType.InsertOutput)
{
return(new InsertWithOutputContext(buildInfo.Parent, sequence, outputContext !, outputExpression !));
}
return(new InsertContext(buildInfo.Parent, sequence, insertType, outputExpression));
}
protected override IBuildContext BuildMethodCall(ExpressionBuilder builder, MethodCallExpression methodCall, BuildInfo buildInfo)
{
var mergeContext = (MergeContext)builder.BuildSequence(new BuildInfo(buildInfo, methodCall.Arguments[0]));
var kind = MergeKind.Merge;
if (methodCall.IsSameGenericMethod(MergeWithOutputInto))
{
kind = MergeKind.MergeWithOutputInto;
}
else if (methodCall.IsSameGenericMethod(MergeWithOutput))
{
kind = MergeKind.MergeWithOutput;
}
if (kind != MergeKind.Merge)
{
var objectType = methodCall.Method.GetGenericArguments()[0];
var actionField = SqlField.FakeField(new DbDataType(typeof(string)), "$action", false);
var insertedTable = SqlTable.Inserted(objectType);
var deletedTable = SqlTable.Deleted(objectType);
mergeContext.Merge.Output = new SqlOutputClause()
{
InsertedTable = insertedTable,
DeletedTable = deletedTable,
};
var selectQuery = new SelectQuery();
var actionFieldContext = new SingleExpressionContext(null, builder, actionField, selectQuery);
var deletedTableContext = new TableBuilder.TableContext(builder, selectQuery, deletedTable);
var insertedTableConext = new TableBuilder.TableContext(builder, selectQuery, insertedTable);
if (kind == MergeKind.MergeWithOutput)
{
var outputExpression = (LambdaExpression)methodCall.Arguments[1].Unwrap();
var outputContext = new MergeOutputContext(
buildInfo.Parent,
outputExpression,
mergeContext,
actionFieldContext,
deletedTableContext,
insertedTableConext
);
return(outputContext);
}
else
{
var outputExpression = (LambdaExpression)methodCall.Arguments[2].Unwrap();
var outputTable = methodCall.Arguments[1];
var destination = builder.BuildSequence(new BuildInfo(buildInfo, outputTable, new SelectQuery()));
UpdateBuilder.BuildSetterWithContext(
builder,
buildInfo,
outputExpression,
destination,
mergeContext.Merge.Output.OutputItems,
actionFieldContext,
deletedTableContext,
insertedTableConext
);
mergeContext.Merge.Output.OutputTable = ((TableBuilder.TableContext)destination).SqlTable;
}
}
return(mergeContext);
}
