MySql分页存储过程1

MySql测试版本：5.0.41-community-nt

/*****************************************************
MySQL分页存储过程
吴剑 2009-07-02
*****************************************************/
DROP PROCEDURE IF EXISTS pr_pager;
CREATE PROCEDURE pr_pager(

IN p_table_nameVARCHAR(1024),/*表名*/
IN p_fieldsVARCHAR(1024),/*查询字段*/
IN p_page_sizeINT,/*每页记录数*/
IN p_page_nowINT,/*当前页*/
IN p_order_stringVARCHAR(128),/*排序条件(包含ORDER关键字,可为空)*/
IN p_where_stringVARCHAR(1024),/*WHERE条件(包含WHERE关键字,可为空)*/
OUT p_out_rowsINT/*输出记录总数*/

)
NOT DETERMINISTIC
SQL SECURITY DEFINER
COMMENT '分页存储过程'

BEGIN

/*定义变量*/
DECLARE m_begin_row INT DEFAULT 0;
DECLARE m_limit_string CHAR(64);

/*构造语句*/
SET m_begin_row = (p_page_now - 1) * p_page_size;
SET m_limit_string = CONCAT(' LIMIT ', m_begin_row, ', ', p_page_size);

SET @COUNT_STRING = CONCAT('SELECT COUNT(*) INTO @ROWS_TOTAL FROM ', p_table_name, ' ', p_where_string);
SET @MAIN_STRING = CONCAT('SELECT ', p_fields, ' FROM ', p_table_name, ' ', p_where_string, ' ', p_order_string, m_limit_string);

/*预处理*/
PREPARE count_stmt FROM @COUNT_STRING;
EXECUTE count_stmt;
DEALLOCATE PREPARE count_stmt;
SET p_out_rows = @ROWS_TOTAL;

PREPARE main_stmt FROM @MAIN_STRING;
EXECUTE main_stmt;
DEALLOCATE PREPARE main_stmt;

END;

调用

mysql> call pr_pager("t","var",3,3, "","",@result);

mysql> call pr_pager("t","var",3,2, "","",@result);