SQL SERVER 2008R2 CLR 正则表达式替换

希望能在看到一个存储过程中引用了哪些表，但又不希望看到在存储过程中已经被注释的那些。 由于SQL Server 对正则表达式的处理能力有限。我也尝试了一些方法，没找到合适的。

http://bbs.csdn.net/topics/390728045

所以只好使用CLR试试，效果不错。

代码如下。

第一步，创建CLR 的DLL 文件。 这个过程大家可以参考这个文章

C#代码如下。注意事项是，由于我的数据库是SQL SERVER 2008 R2，所以创建项目时，要指定项目的framework 是.net 3.5 不然后面会有一些兼容错误。

//assembly should be created in .net 3.5 for SQL SERVER 2008R2//c#CODE AS BELOWusing System.Text;   using Microsoft.SqlServer.Server;   using System.Data.SqlTypes;   using System.Text.RegularExpressions;      public partial class SQLReg   {           [SqlFunction(IsDeterministic = true, DataAccess = DataAccessKind.None)]       public static SqlString fn_RegexReplace(           SqlString input, SqlString pattern, SqlString replacement)       {           return (SqlString)Regex.Replace(               input.Value, pattern.Value, replacement.Value);       }   }   

要在数据库中使用CLR，得在相应的数据库上设置如下选项。

EXEC sp_configure 'clr enable', 1;RECONFIGURE;GO

设置好之后，创建assembly，DLL是由上面的步骤获得的。

CREATE ASSEMBLY SQLRegFROM 'C:\Temp\SQLRegexReplace.dll';GO

创建成功后，在SQL SERVER 数据库的Programmability下的Assemblies可以看到SQLReg。 我们可以把Assembly 以脚本的形式导出，这样就可以在其他数据库运行这个脚本，来使用Assembly中的函数，当然这个数据库得设置了‘clr enable’。

本文的Assembly代码如下：

/****** Object: SqlAssembly [SQLReg] Script Date: 04/16/2014 21:12:57 ******/IF EXISTS (SELECT * FROM sys.assemblies asms WHERE asms.name = N'SQLReg' and is_user_defined = 1)DROP ASSEMBLY [SQLReg]GO/****** Object: SqlAssembly [SQLReg] Script Date: 04/16/2014 21:12:57 ******/--CREATE ASSEMBLY [SQLReg]AUTHORIZATION [dbo]FROM 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PERMISSION_SET = SAFEGO

下面我们创建一个自定义函数来使用Assembly中的函数。代码如下

--SQLReg assembly name--SQLRegReplace class name--gf_sys_Regex_Replace function in class--CREATE FUNCTION global.gf_sys_REGEX_REPLACE(  @input AS NVARCHAR(MAX),  @pattern AS NVARCHAR(MAX),  @replacement AS NVARCHAR(MAX))RETURNS NVARCHAR(MAX)WITH RETURNS NULL ON NULL INPUTEXTERNAL NAME SQLReg.SQLRegReplace.gf_sys_Regex_Replace;GO

--测试代码select global.gf_sys_REGEX_REPLACE('<div>aaaa</div>','<[^>]+>','')

下面的代码就是将存储过程定义语句，进行消去注释 的处理，注意的是，如果存储过程的定义进行了加密处理，那么这里是无法处理这类存储过程。

我将存储过程定义按行存储到一个表中，这样方便后面和另一个表做连接，来确定这个存储过程中引用了哪些数据表。

代码如下

SET NOCOUNT ON    DROP TABLE TEMP_TABLE;    CREATE TABLE TEMP_TABLE    (       SPNAME  NVARCHAR(200),       ROWSDEF NVARCHAR(MAX)    )    DECLARE @vSP_Name          NVARCHAR(200)=N'',          @vSP_Definition    NVARCHAR(max)=N'',          @vSP_DefinitionTmp NVARCHAR(max)=N''  --extract all the store procedure's definition.DECLARE curStoreProcedureDefinition CURSOR FOR    SELECT OBJECT_NAME(SM.OBJECT_ID) AS SP_Name,           --replace(DEFINITION, '''', '''''') AS SP_Definition,           DEFINITION                AS SP_Definition    FROM   SYS.SQL_MODULES SM    JOIN   SYS.OBJECTS SO      ON SO.OBJECT_ID = SM.OBJECT_ID    WHERE  SO.TYPE = 'P' AND OBJECT_NAME(SM.OBJECT_ID) LIKE '%service_health%'    OPEN curStoreProcedureDefinition;    FETCH NEXT FROM curStoreProcedureDefinition INTO @vSP_Name, @vSP_Definition    WHILE @@FETCH_STATUS = 0    BEGIN        DECLARE @flag INT=1        DECLARE @flag3 INT=1              --PRINT @vSP_Name        --PRINT  @vSP_Definition        SET @vSP_DefinitionTmp=@vSP_Definition    --here still need to be improved to handle the nested comments      SET @vSP_DefinitionTmp=global.gf_sys_REGEX_REPLACE (@vSP_DefinitionTmp,'\/\*((?!(\/\*|\*\/))[\s\S])*?\*\/|--.*\n','')                --SET @vSP_DefinitionTmp=global.gf_sys_REGEX_REPLACE (@vSP_DefinitionTmp,'\-\-([^\''\r\n]{0,}(\''[^\''\r\n]{0,}\''){0,1}[^\''\r\n]{0,}){0,}$','')                  PRINT @vSP_DefinitionTmp              --PRINT @vSP_DefinitionTmp          --set @vSP_DefinitionTmp=@vSP_Definition        WHILE @flag3 > 0          BEGIN              SET @flag3=charindex(char(10), @vSP_DefinitionTmp)                --print @flag3              IF len(ltriM(rtrim(LEFT(@vSP_DefinitionTmp, charindex(char(10), @vSP_DefinitionTmp))))) >= 5                INSERT INTO TEMP_TABLE                VALUES      (@vSP_Name,                             LTRIM(RTRIM(LEFT(@vSP_DefinitionTmp, charindex(char(10), @vSP_DefinitionTmp)))))                IF len(@vSP_DefinitionTmp) - charindex(char(10), @vSP_DefinitionTmp) > 0                SET @vSP_DefinitionTmp= RIGHT(@vSP_DefinitionTmp, len(@vSP_DefinitionTmp) - charindex(char(10), @vSP_DefinitionTmp))              ELSE                SET @vSP_DefinitionTmp=''          --print @vSP_Definition          END          FETCH NEXT FROM curStoreProcedureDefinition INTO @vSP_Name, @vSP_Definition    END    CLOSE curStoreProcedureDefinition;    DEALLOCATE curStoreProcedureDefinition;    SELECT *  FROM   TEMP_TABLE