MySQL存储过程详解：实现分页查询

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_name        VARCHAR(1024),        /*表名*/
    IN    p_fields            VARCHAR(1024),        /*查询字段*/
    IN    p_page_size            INT,                /*每页记录数*/
    IN    p_page_now            INT,                /*当前页*/
    IN    p_order_string        VARCHAR(128),        /*排序条件(包含ORDER关键字,可为空)*/
    IN    p_where_string        VARCHAR(1024),        /*WHERE条件(包含WHERE关键字,可为空)*/
    OUT    p_out_rows            INT                    /*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);