Sql Server使用正则表达式

近日因项目需求，需要在sql server中用到正则表达式，因Sql Server本身并不支持正则表达式，需要用到Clr函数。

在此记录一下步骤，与大家共享，虽然写的是原创，但有参考网上的文章。

1.使用 VS2010创建一个新的项目，选择【Visual C#  SQL CLR数据库项目】，输入项目名称，我这里为：SqlClrFunctions

注意：因我的是sql server 2008 R2，所以选择.Net Framework 3.5（这一点很重要）

2.给项目添加一个类，我取名为：SqlClrFunctions.cs

3.在弹出的对话框输入类开：SqlClrFunctions.cs

4.输入以下C#代码：

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Data.SqlTypes;
using System.Text.RegularExpressions;

namespace ClrFunctions
{
    public static class SqlClrFunctions
    {
        static SqlClrFunctions() { }
              
        [Microsoft.SqlServer.Server.SqlFunction(IsDeterministic = true, IsPrecise = true)]
        public static SqlBoolean RegexLike(SqlString input, SqlString pattern, SqlInt32 options)
        {
            if (input.IsNull || pattern.IsNull)
            {
                return new SqlBoolean(false);
            }
            bool result = Regex.IsMatch(input.Value, pattern.Value, (RegexOptions)options.Value);
            return new SqlBoolean(result);
        }

        [Microsoft.SqlServer.Server.SqlFunction(IsDeterministic = true, IsPrecise = true)]
        public static SqlString RegexReplace(SqlString input, SqlString pattern, SqlString replacement, SqlInt32 options)
        {
            if (input.IsNull || pattern.IsNull || replacement.IsNull)
            {
                return input;
            }
            string s = Regex.Replace(input.Value, pattern.Value, replacement.Value, (RegexOptions)options.Value);
            return new SqlString(s);
        }

        //    RegexOptions.None, 0;
        //    RegexOptions.IgnoreCase, 1;
        //    RegexOptions.Multiline, 2;
        //    RegexOptions.ExplicitCapture, 4;
        //    RegexOptions.Compiled, 8;
        //    RegexOptions.Singleline, 16;
        //    RegexOptions.IgnorePatternWhitespace, 32;
        //    RegexOptions.RightToLeft, 64;
        //    RegexOptions.ECMAScript, 256;
        //    RegexOptions.CultureInvariant, 512;
        //    (RegexOptions.IgnoreCase | RegexOptions.Multiline), 3;
    }
}

5.点击生成，或者直接按快捷键Ctrl+Shift+B

6.执行以下sql脚本，允许执行clr函数

sp_configure 'show advanced options', 1;
GO
RECONFIGURE WITH OVERRIDE;
GO

sp_configure 'clr enabled',1 ;
GO
RECONFIGURE WITH OVERRIDE;
GO

7.执行sql脚本，此处的dll为实际dll的完整路径

CREATE ASSEMBLY [SqlClrFunctions]
Authorization [dbo]
FROM 'D:\users\mark\documents\visual studio 2010\Projects\SqlClrFunctions\SqlClrFunctions\bin\Debug\SqlClrFunctions.dll'
WITH PERMISSION_SET = SAFE

8.执行sql脚本创建函数：

CREATE FUNCTION dbo.fn_RegexReplace(
@input nvarchar(4000),
@pattern nvarchar(1000),
@replacement nvarchar(1000),
@options INT
 ) RETURNS nvarchar(4000)
AS EXTERNAL NAME SqlClrFunctions.[ClrFunctions.SqlClrFunctions].RegexReplace; 

9.执行sql测试：

SELECT dbo.fn_RegexReplace('ABC)DEF.ABCDEF (ABCD GGGG ABC 900 ABC','(?i)(?<=^|[\s()])ABC(?=[\W]|$)','123',0);

10.看看结果：

续：

如果我们要发布脚本的时候，直接用DLL可能就不太方便，有没有更好的方法呢？当然有，请看：

1.在SSMS（sql server管理器）里面依次展开数据库名-->可编程性-->程序集-->第7步的程序集名称

2.这里我们就可以看到以下sql脚本：

USE [Test]
GO

/****** Object:  SqlAssembly [SqlClrFunctions]    Script Date: 08/18/2013 22:50:06 ******/
CREATE ASSEMBLY [SqlClrFunctions]
AUTHORIZATION [dbo]
FROM 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WITH PERMISSION_SET = SAFE

GO

3.这样我们就可以直接用sql脚本，不需要dll了。