MySQL中关于行转列的存储过程的写法(使用游标)

代码如下：

-- ------------------------------ Procedure structure for `sp_pro_rm_cs`-- ----------------------------DROP PROCEDURE IF EXISTS `sp_pro_rm_cs`;DELIMITER ;;CREATE DEFINER=`root`@`localhost` PROCEDURE `sp_pro_rm_cs`(in p_bookno varchar(64))BEGINDECLARE v_sql VARCHAR(8000);DECLARE v_rmname VARCHAR(20);DECLARE v_rmcode VARCHAR(20);DECLARE v_row INT(11);DECLARE v_done INT(11);DECLARE v_i INT(11);DECLARE csr_rm CURSOR FORSELECT DISTINCT pr_rmname, pr_rmcode FROM v_pro_rm_cs_info WHERE pr_bookno = p_bookno;DECLARE CONTINUE HANDLER FOR NOT FOUND SET v_done = 1;DROP TABLE IF EXISTS v_pro_rm_cs_info;CREATE TEMPORARY TABLE v_pro_rm_cs_info (pr_bookno varchar(20) DEFAULT NULL,pr_rmname varchar(20) DEFAULT NULL,pr_rmcode varchar(20) DEFAULT NULL,pr_pname varchar(20) DEFAULT NULL,pr_rmloss decimal(10,3) DEFAULT NULL,pr_rmrate decimal(10,3) DEFAULT NULL);INSERT INTO v_pro_rm_cs_info (pr_bookno, pr_rmname, pr_rmcode, pr_pname, pr_rmloss, pr_rmrate)SELECT t1.rb_book_no AS pr_bookno, t1.rb_rm_name AS pr_rmname, t1.rb_rm_code AS pr_rmcode, t2.cs_pname AS pr_pname, t2.cs_loss AS pr_rmloss, t2.cs_rate AS pr_rmrateFROM t_rm_backup t1 LEFT JOIN m_consumption t2 ON t1.rb_rm_name = t2.cs_rmname AND t1.rb_rm_code = t2.cs_rmcode;SET v_done = 0;SET v_sql = 'select distinct t1.pr_pname, t2.pl_pwgt_sum AS pr_pwgt_s';SET v_i = 1;OPEN csr_rm;csr_loop:loopFETCH csr_rm INTO v_rmname, v_rmcode;IF v_done THENLEAVE csr_loop;END IF;SET v_sql = concat(v_sql, ', sum(case when t1.pr_rmname = "', v_rmname, '" and t1.pr_rmcode = "', v_rmcode,'" then t1.pr_rmloss else null end) "', 'pr_', v_i, 'l"');SET v_sql = concat(v_sql, ', sum(case when t1.pr_rmname = "', v_rmname, '" and t1.pr_rmcode = "', v_rmcode,'" then t1.pr_rmrate else null end) "', 'pr_', v_i, 'r"');SET v_sql = concat(v_sql, ', sum(case when t1.pr_rmname = "', v_rmname, '" and t1.pr_rmcode = "', v_rmcode,'" then Round(t2.pl_pwgt_sum * t1.pr_rmloss, 2) else null end) "', 'pr_', v_i, 'rl"');SET v_sql = concat(v_sql, ', sum(case when t1.pr_rmname = "', v_rmname, '" and t1.pr_rmcode = "', v_rmcode,'" then Round((t2.pl_pwgt_sum * t1.pr_rmloss * t1.pr_rmrate) / (1 - t1.pr_rmrate), 2) else null end) "', 'pr_', v_i, 'rr"');SET v_i = v_i + 1;END LOOP;CLOSE csr_rm;SET v_sql = concat(v_sql, ' from v_pro_rm_cs_info t1 ');SET v_sql = concat(v_sql, ' left join ( ');SET v_sql = concat(v_sql, ' select distinct t3.pl_pname, SUM(t3.pl_pwgt_sum) as pl_pwgt_sum, t4.mb_bookno ');SET v_sql = concat(v_sql, ' from t_packlist t3 inner join t_manual_book t4 ');SET v_sql = concat(v_sql, ' on t3.pl_ex_date >= t4.mb_wo_stt and t3.pl_ex_date <= t4.mb_wo_end ');SET v_sql = concat(v_sql, ' group by pl_pname ');SET v_sql = concat(v_sql, ' ) t2 on t1.pr_bookno = t2.mb_bookno and t1.pr_pname = t2.pl_pname ');SET v_sql = concat(v_sql, ' group by t1.pr_pname ');SET @sql = v_sql; PREPARE sl FROM @sql; EXECUTE sl; DEALLOCATE PREPARE sl;/*SELECT @sql;*/END;;DELIMITER ;

 

关于MySQL存储过程的相关资料：

http://www.cnblogs.com/xnxylf/archive/2009/09/21/1571195.html

http://www.cublog.cn/u/14321/showart_153404.html

http://www.cnblogs.com/hsqzzzl/archive/2008/02/21/1076646.html

http://www.ccvita.com/100.html

http://www.php100.com/html/webkaifa/database/Mysql/2009/0418/1185.html