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lbehm/STRING_AGG.cs

Forked from FilipDeVos/Aggregate_Concatenate.sql
Last active May 16, 2023 14:16
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SQL Server Aggregate to concatenate strings - shim for STRING_AGG
Raw
Aggregate_Concatenate.sql
-- This script deploys the dbo.Concatenate() aggregate function on SQL Server. This is compiled from the code Concatenate.cs below.
CREATE ASSEMBLY [concat]
FROM 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WITH PERMISSION_SET = SAFE
GO
CREATE AGGREGATE [dbo].[Concatenate] (@value [nvarchar](max))
RETURNS [nvarchar](max)
EXTERNAL NAME [concat].[Concatenate]
GO
Raw
Concatenate.cs
using System;
using System.Data.SqlTypes;
using System.IO;
using System.Text;
using Microsoft.SqlServer.Server;
[Serializable]
[SqlUserDefinedAggregate(Format.UserDefined, IsInvariantToNulls = true, IsInvariantToDuplicates = false, IsInvariantToOrder = false, MaxByteSize = 8000, Name = "Concatenate")]
public class Concatenate : IBinarySerialize
{
private StringBuilder _intermediateResult;
internal string IntermediateResult {
get
{
return _intermediateResult.ToString();
}
}
public void Init()
{
_intermediateResult = new StringBuilder();
}
public void Accumulate(SqlString value)
{
if (value.IsNull) return;
_intermediateResult.Append(value.Value);
}
public void Merge(Concatenate other)
{
if (null == other)
return;
_intermediateResult.Append(other._intermediateResult);
}
public SqlString Terminate()
{
var output = string.Empty;
if (_intermediateResult != null && _intermediateResult.Length > 0)
output = _intermediateResult.ToString(0, _intermediateResult.Length - 1);
return new SqlString(output);
}
public void Read(BinaryReader reader)
{
if (reader == null)
throw new ArgumentNullException("reader");
_intermediateResult = new StringBuilder(reader.ReadString());
}
public void Write(BinaryWriter writer)
{
if (writer == null)
throw new ArgumentNullException("writer");
writer.Write(_intermediateResult.ToString());
}
}
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