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Change DATEDIFF to DATEDIFF_BIG for Sql Server v13+ #198

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Merged
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Dec 15, 2021
Merged

Change DATEDIFF to DATEDIFF_BIG for Sql Server v13+ #198

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acc83e0
Change DATEDIFF to DATEDIFF_BIG for Sql Server v13+
alex-kulakov Dec 1, 2021
17b0099
Revert accessors change
alex-kulakov Dec 3, 2021
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41 changes: 38 additions & 3 deletions Orm/Xtensive.Orm.SqlServer/Sql.Drivers.SqlServer/v13/Compiler.cs
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Original file line number Diff line number Diff line change
@@ -1,13 +1,48 @@
// Copyright (C) 2018 Xtensive LLC.
// All rights reserved.
// For conditions of distribution and use, see license.
// Copyright (C) 2018-2021 Xtensive LLC.
// This code is distributed under MIT license terms.
// See the License.txt file in the project root for more information.
// Created by: Alexey Kulakov
// Created: 2018.09.21

using Xtensive.Sql.Dml;

namespace Xtensive.Sql.Drivers.SqlServer.v13
{
internal class Compiler : v12.Compiler
{
protected const string DayPart = "DAY";
protected const string MillisecondPart = "MS";
protected const string NanosecondPart = "NS";
protected const string ZeroTime = "'00:00:00.0000000'";

/// <inheritdoc/>
public override void Visit(SqlFunctionCall node)
{
if (node.FunctionType == SqlFunctionType.DateTimeOffsetTimeOfDay) {
DateTimeOffsetTimeOfDay(node.Arguments[0]).AcceptVisitor(this);
}
else {
base.Visit(node);
}
}

protected override SqlExpression DateTimeSubtractDateTime(SqlExpression date1, SqlExpression date2)
{
return DateDiffBigNanosecond(date2, date1);
}

#region Static Helpers

protected static SqlUserFunctionCall DateDiffBigNanosecond(SqlExpression date1, SqlExpression date2) =>
SqlDml.FunctionCall("DATEDIFF_BIG", SqlDml.Native(NanosecondPart), date1, date2);

private static SqlExpression DateTimeOffsetTimeOfDay(SqlExpression dateTimeOffset) =>
DateDiffBigNanosecond(
SqlDml.Native(ZeroTime),
SqlDml.Cast(dateTimeOffset, new SqlValueType("time")));

#endregion

public Compiler(SqlDriver driver)
: base(driver)
{
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