MySQL 中的存储过程用 space 空值替换零值

Question

这是我在数据库 MySql 版本 8.0.17

上的存储过程

CREATE DEFINER=`root`@`%` PROCEDURE `SP`(IN tun CHAR(100), 
tmonth int(2), 
tparag LONGTEXT, 
tid int(11))
BEGIN

declare 2tun char(100);
declare 2tmonth int(2);
declare 2tyear int(4);
DECLARE 2tparag LONGTEXT;
DECLARE 2tid INT(11);

SET 2tun = tun;
SET 2tmonth = tmonth;
SET 2tyear = YEAR(CURDATE());
SET 2tparag = tparag;
SET 2tid = tid;

SET @s = CONCAT('UPDATE t_contents_', 2tun, '_', 2tmonth, '_', 2tyear, ' 
                 SET contents = \'',2tparag,'\'
                 WHERE sID = \'',2tid,'\';');
                                 
PREPARE stmt FROM @s;
EXECUTE stmt;
DEALLOCATE PREPARE stmt;                             

END

这段代码工作正常。

但是如果尝试使用其他版本的 SP，我将 2tparag 变量值上的新行 ('\r' OR '\n' OR '\r\n') 替换为 space

CREATE DEFINER=`root`@`%` PROCEDURE `SP`(IN tun CHAR(100), 
tmonth int(2), 
tparag LONGTEXT, 
tid int(11))
BEGIN

declare 2tun char(100);
declare 2tmonth int(2);
declare 2tyear int(4);
DECLARE 2tparag LONGTEXT;
DECLARE 2tid INT(11);

SET 2tun = tun;
SET 2tmonth = tmonth;
SET 2tyear = YEAR(CURDATE());
SET 2tparag = tparag;
SET 2tid = tid;

SET @s = CONCAT('UPDATE t_contents_', 2tun, '_', 2tmonth, '_', 2tyear, ' 
                 SET contents = \'',REPLACE(2tparag,'\r' OR '\n' OR '\r\n', ' '),'\' 
                 WHERE sID = \'',2tid,'\';');
                                 
PREPARE stmt FROM @s;
EXECUTE stmt;
DEALLOCATE PREPARE stmt;
                                 
END

当我在数据库的 2tparag 变量上写入 2021 时，它用 2 21 值更新的字段...

如何解决这个问题？

例子

起始字符串是

Neque porro quisquam est qui dolorem ipsum

通过添加当前年份更新此字符串

Neque porro quisquam est qui dolorem ipsum 2021

在数据库中存储

Neque porro quisquam est qui dolorem ipsum 2 21

Answer 1

您的查询没有问题

您的 REPALCE 不会像您预期的那样工作，Mysql 只会替换一个字符，所以只有 [= 的 pmne 17=]、\r或\n\r

修复您需要使用的所有事件

REPLACE(REPLACE(REPLACE('test\na\rb','\r' , ' '),'\n' , ' '),'\r\n', ' ')

CREATE TABLE t_contents_123_2_2021(sID int, contents LONGTEXT)

INSERT INTO t_contents_123_2_2021 VALUEs(1,'test')

CREATE PROCEDURE `SP`(IN tun CHAR(100), 
tmonth int(2), 
tparag LONGTEXT, 
tid int(11))
BEGIN

declare 2tun char(100);
declare 2tmonth int(2);
declare 2tyear int(4);
DECLARE 2tparag LONGTEXT;
DECLARE 2tid INT(11);

SET 2tun = tun;
SET 2tmonth = tmonth;
SET 2tyear = YEAR(CURDATE());
SET 2tparag = tparag;
SET 2tid = tid;

SET @s = CONCAT('UPDATE t_contents_', 2tun, '_', 2tmonth, '_', 2tyear, ' 
                 SET contents = \'',REPLACE(2tparag,'\r' OR '\n' OR '\r\n', ' '),'\' 
                 WHERE sID = \'',2tid,'\';');
                                 
PREPARE stmt FROM @s;
EXECUTE stmt;
DEALLOCATE PREPARE stmt;
 
END

✓

CALL SP ('123','02', 'Neque porro quisquam est qui dolorem ipsum',1)

SELECT * FROM t_contents_123_2_2021

sID | contents                                  
--: | :-----------------------------------------
  1 | Neque porro quisquam est qui dolorem ipsum

db<>fiddle here

MySQL 中的存储过程用 space 空值替换零值

Stored procedure in MySQL replace zero value with an space empty

mysql

stored-procedures