基于Mysql的通用分页存储过程

基于Mysql的通用分页存储过程 2008-04-16 14:08:56
标签：数据库

mysql
存储过程
原创作品，允许转载，转载时请务必以超链接形式标明文章
原始出处 、作者信息和本声明。否则将追究法律责任。/article/7315286.html

　　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！