我创建了一个CLR 聚合函数这需要一个varchar
列并返回以逗号分隔的所有值。换句话说,它将多个字符串连接到一个以逗号分隔的列表中。我确信它的性能比任何 T-Sql 技巧都要好.
与任何聚合函数一样,它可以与group by
。例如:
SELECT id, name, desc, JoinStrings(CONVERT(VARCHAR(20), category_id))
FROM product p
INNER JOIN category_products c ON p.category_id = c.category_id
GROUP BY id, name, desc
以下是将 CLR 程序集创建到 Sql Server 2008 中的 C# 代码:
using System;
using System.Data;
using System.Data.SqlClient;
using System.Data.SqlTypes;
using Microsoft.SqlServer.Server;
[Serializable]
[Microsoft.SqlServer.Server.SqlUserDefinedAggregate(Format.UserDefined, IsInvariantToDuplicates=false, IsInvariantToOrder=false, IsInvariantToNulls=true, MaxByteSize=-1)]
public struct JoinStrings : IBinarySerialize
{
private char[] sb;
private int pos;
public void Init()
{
sb = new char[512000];
pos = 0;
}
public void Accumulate(SqlString Value)
{
if (Value.IsNull) return;
char[] src = Value.ToString().ToCharArray();
Array.Copy(src, 0, sb, pos, src.Length);
pos += src.Length;
sb[pos] = ',';
pos++;
}
public void Merge(JoinStrings Group)
{
Accumulate(Group.Terminate());
}
public SqlString Terminate()
{
if (pos <= 0)
return new SqlString();
else
return new SqlString(new String(sb, 0, pos-1));
}
public void Read(System.IO.BinaryReader r)
{
this.Init();
pos = r.ReadInt32();
r.Read(sb, 0, pos);
}
public void Write(System.IO.BinaryWriter w)
{
w.Write(pos);
w.Write(sb, 0, pos);
}
}
以下是创建该函数的代码(尽管从 Visual Studio 部署应该会自动完成):
CREATE AGGREGATE [dbo].[JoinStrings]
(@s [nvarchar](4000))
RETURNS[nvarchar](max)
EXTERNAL NAME [YouAssemblyName].[JoinStrings]