基于Mysql的通用分页存储过程
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前面“结合JSTL用配置来完成基于存储过程的分页显示”文章中使用的是SQL Server 2000数据库,而由于Web开发可能不仅仅使用一种数据库,比如还可能用到Mysql等,因此为了在Mysql下方便的使用分页,笔者将分页存储过程P_viewPage在Mysql下进行了改写,通用性不变,功能也基本一样,读者可以按照自己的需求自行调用该存储过程实现分页,也可以按照前面文章中那个项目模板实现分页显示,这里不得不为自己赞一下,由于前面文章中介绍的项目模板移植性好,你除了某些必要的工作如在Mysql下重新构建数据库,重写分页存储过程和加载Mysql驱动外,仅仅针对项目的变化就是重写连接池配置文件Proxool.xml,使其适应Mysql配置,而项目其它任何地方均勿需做改动,是不是特别方便。而且我们完全可以实现项目中两种不同数据库的无缝结合,同时访问两种不同的数据库而不对项目做任何代码的改写,你要做的工作也仅仅是在连接池配置文件Proxool.xml中添加一个新的连接池而已!Perfect!下面看看我们在Mysql下重写的分页存储过程P_viewPage.
CREATE PROCEDURE `P_viewPage`( $TableName VARCHAR(200), $FieldList VARCHAR(2000), $PrimaryKey VARCHAR(100), $Where VARCHAR(1000), $Order VARCHAR(1000), $SortType INT, $RecorderCount INT, $PageSize INT, $PageIndex INT, OUT $TotalCount INTEGER, OUT $TotalPageCount INTEGER ) BEGIN IF !(($TableName is null OR $TableName='') OR ($FieldList is null OR $FieldList='') OR ($PrimaryKey is null OR $PrimaryKey='') OR $SortType < 1 OR $SortType >3 OR $RecorderCount < 0 OR $PageSize < 0 OR $PageIndex < 0) THEN IF ($where is null OR $where='') THEN SET @new_where1 = ' ' ; SET @new_where2 = ' WHERE ' ; ELSE SET @new_where1 =concat(' WHERE ',$where); SET @new_where2 =concat(' WHERE ',$where,' AND '); END IF; IF $order='' OR $SortType = 1 OR $SortType = 2 THEN IF $SortType = 1 THEN SET @new_order =concat(' ORDER BY ',$PrimaryKey,' ASC' ); END IF; IF $SortType = 2 THEN SET @new_order =concat(' ORDER BY ',$PrimaryKey,' DESC'); END IF; ELSE SET @new_order =concat(' ORDER BY ',$Order); END IF; SET @SqlCount = concat('SELECT COUNT(*) into @TotalCount FROM ',$TableName,@new_where1); SET @SqlCount1 = concat('SELECT CEILING((COUNT(*)+0.0)/',$PageSize,') into @TotalPageCount FROM ',$TableName,@new_where1); IF $RecorderCount = 0 THEN PREPARE stmt1 FROM @SqlCount; EXECUTE stmt1; set $TotalCount=@TotalCount; PREPARE stmt1 FROM @SqlCount1; EXECUTE stmt1; set $TotalPageCount=@TotalPageCount; ELSE set $TotalCount = $RecorderCount; END IF; IF $PageIndex > CEILING(($TotalCount+0.0)/$PageSize) THEN SET $PageIndex = CEILING(($TotalCount+0.0)/$PageSize); END IF; IF $PageIndex = 0 or $PageIndex = 1 THEN SET @Sql=concat('SELECT ',$FieldList,' FROM ',$TableName,@new_where1,@new_order,' limit ',$PageSize); ELSE IF $SortType = 1 THEN SET @Sql=concat('SELECT ',$FieldList,' FROM ',$TableName,@new_where2,$PrimaryKey,' > (SELECT max(',$PrimaryKey,') FROM (SELECT ',$PrimaryKey,' FROM ',$TableName,@new_where1,@new_order,' limit ',$PageSize*($PageIndex-1),' ) AS TMP) ',@new_order,' limit ',$PageSize); END IF; IF $SortType = 2 THEN SET @Sql=concat('SELECT ',$FieldList,' FROM ',$TableName,@new_where2,$PrimaryKey,' < (SELECT MIN(',$PrimaryKey,') FROM (SELECT ',$PrimaryKey,' FROM ',$TableName,@new_where1,@new_order,' limit ',$PageSize*($PageIndex-1),' ) AS TMP) ',@new_order,' limit ',$PageSize); END IF; IF $SortType = 3 THEN IF INSTR($Order,',') > 0 THEN SET @Sql=concat('SELECT ',$FieldList,' FROM ',$TableName,@new_where2,$PrimaryKey,' NOT IN (SELECT ',$PrimaryKey,' FROM (SELECT ',$PrimaryKey,' FROM ',$TableName,@new_where1,@new_order,' limit ',$PageSize*($PageIndex-1),' ) a)',@new_order,' limit ',$PageSize); ELSE SET @new_order =concat(' ORDER BY ',$PrimaryKey,' ASC' ); SET @Sql=concat('SELECT ',$FieldList,' FROM ',$TableName,@new_where2,$PrimaryKey,' > (SELECT max(',$PrimaryKey,') FROM (SELECT ',$PrimaryKey,' FROM ',$TableName,@new_where1,@new_order,' limit ',$PageSize*($PageIndex-1),' ) AS TMP) ',@new_order,' limit ',$PageSize); END IF; END IF; END IF; Prepare stmt2 from @Sql; execute stmt2; END IF; END ; Job Done!
本文出自 “君临天下” 博客,请务必保留此出处http://wenlujun.blog.51cto.com/336737/71819 本文出自 51CTO.COM技术博客 |


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