如何在大写的Mysql中更改表的所有列 [英] How Can I Alter All The Columns Of A Table In Mysql In Upper Case

问题描述

DELIMITER //



DROP PROCEDURE IF EXTSTS uppercasecol //



CREATE PROCEDURE uppercasecol（IN tblname VARCHAR（200））

BEGIN

DECLARE完成INT DEFAULT 0;

DECLARE oldname VARCHAR（200）;

DECLARE cur CURSOR FOR SELECT COLUMN_NAME FROM INFORMATION_SCHEMA.COLUMNS

WHERE TABLE_SCHEMA ='ADM01'和TABLE_NAME = tblname;

DECLARE CONTINUE HANDLER for NOT FOUND SET done = 1;

OPEN cur;

REPEAT

FETCH cur INTO oldname;

SET @newname = UPPER（oldname）;

#IF newname等于oldname，什么都不做;

#select'a'<> '一个'; - > 0

#select'a'<> BINARY'A'; - > 1

SET @isNotSame = @newname<> BINARY oldname;

如果没有完成&& @ isNotSame那么

SET @SQL = CONCAT（'ALTER TABLE`'，tblname，'`CHANGE COLUMN`'，oldname，'`@newname ）;

PREPARE tmpstmt FROM @SQL;

EXECUTE tmpstmt;

DEALLOCATE PREPARE tmpstmt;

END IF;

UNTIL完成END REPEAT;

CLOSE cur;

结束//

DELIMITER;

CALL uppercasecol（'USER_MODULE'）;



我使用上面的代码将列名转换为大写但代码在CONCAT中给出错误1604（42000）（'ALTER TABLE`'，tblname，'`CHANGE COLUMN`'，oldname，'`@新名字'）。任何人都可以帮我解决这个问题...



提前预计

解决方案

有一些错误。

这应该有效。

  BEGIN  
  DECLARE  done  INT   DEFAULT   0 ; 
  DECLARE  oldname  VARCHAR （ 200 ）; 
  DECLARE 数据类型 VARCHAR （ 200 ）; 
  DECLARE  cur  CURSOR   FOR   SELECT  COLUMN_NAME，COLUMN_TYPE  FROM  INFORMATION_SCHEMA.COLUMNS 
  WHERE  TABLE_SCHEMA = '  ADM01'  AND  TABLE_NAME = tblname; 
 
  DECLARE   CONTINUE  HANDLER  FOR   NOT  FOUND  SET  done =  1 ; 
  OPEN  cur; 
 
 REPEAT 
  FETCH  cur  INTO  oldname，datatype; 
  SET   @ newname  = UPPER（oldname）; 
  SET   @ isNotSame  =  @ newname <>  BINARY  oldname; 
 
  IF   NOT  done&&  @ isNotSame   THEN  
 
  SET   @ SQL  = CONCAT（'  ALTER TABLE `'，tblname，' `CHANGE COLUMN`'，oldname，' ``'， @ newname ，' `'，datatype）; 
 
 PREPARE tmpstmt  FROM   @ SQL ; 
  EXECUTE  tmpstmt; 
  DEALLOCATE  PREPARE tmpstmt; 
 
  END   IF ; 
 
 UNTIL完成 END  REPEAT; 
 
  CLOSE  cur; 
 
  SELECT  '  OK'   FROM  DUAL; 
 
  END  

最后一行< pre lang =SQL> SELECT ' OK' FROM DUAL

会显示程序是否正确结束。



比较concat函数以找到你的错误。



当你在程序中出现错误并且你无法调试时，尝试删除代码行并重新执行它找到有问题的行/ s，或用常量替换变量来查看是否所有工作都按预期工作。



为了找到你的错误我做了程序返回也concat的结果：

  SELECT  
 CONCAT（'  ALTER TABLE`'，tblname，' `CHANGE COLUMN`'，oldname，' ``'， @ newname ，' `'，datatype）
  FROM  DUAL 

所以我发现你动态执行的声明不正确。



F.

DELIMITER //

DROP PROCEDURE IF EXISTS uppercasecol //

CREATE PROCEDURE uppercasecol(IN tblname VARCHAR(200))
BEGIN
DECLARE done INT DEFAULT 0;
DECLARE oldname VARCHAR(200);
DECLARE cur CURSOR FOR SELECT COLUMN_NAME FROM INFORMATION_SCHEMA.COLUMNS
WHERE TABLE_SCHEMA='ADM01' AND TABLE_NAME=tblname;
DECLARE CONTINUE HANDLER FOR NOT FOUND SET done = 1;
OPEN cur;
REPEAT
FETCH cur INTO oldname;
SET @newname = UPPER(oldname);
#IF newname equals to oldname, do nothing;
#select 'a' <> 'A'; -> 0
#select 'a' <> BINARY 'A'; -> 1
SET @isNotSame = @newname <> BINARY oldname;
IF NOT done && @isNotSame THEN
SET @SQL = CONCAT('ALTER TABLE `',tblname,'` CHANGE COLUMN `',oldname,'` @newname');
PREPARE tmpstmt FROM @SQL;
EXECUTE tmpstmt;
DEALLOCATE PREPARE tmpstmt;
END IF;
UNTIL done END REPEAT;
CLOSE cur;
END //
DELIMITER ;
CALL uppercasecol('USER_MODULE');

I am using the above code to convert the column names to upper case but the code is giving error 1604(42000) in CONCAT('ALTER TABLE `',tblname,'` CHANGE COLUMN `',oldname,'` @newname'). Can anyone help me out in this...

thanx in advance

解决方案

There was some errors.
this should work.

BEGIN 
 DECLARE done INT DEFAULT 0; 
 DECLARE oldname VARCHAR(200); 
 DECLARE datatype VARCHAR(200); 
 DECLARE cur CURSOR FOR SELECT COLUMN_NAME, COLUMN_TYPE FROM INFORMATION_SCHEMA.COLUMNS 
 WHERE TABLE_SCHEMA='ADM01' AND TABLE_NAME=tblname;

 DECLARE CONTINUE HANDLER FOR NOT FOUND SET done = 1; 
 OPEN cur; 
 
 REPEAT 
   FETCH cur INTO oldname, datatype; 
   SET @newname = UPPER(oldname); 
   SET @isNotSame = @newname <> BINARY oldname; 

   IF NOT done && @isNotSame THEN 

     SET @SQL = CONCAT('ALTER TABLE `', tblname, '` CHANGE COLUMN `', oldname, '` `', @newname, '`', datatype); 
 
     PREPARE tmpstmt FROM @SQL; 
     EXECUTE tmpstmt; 
     DEALLOCATE PREPARE tmpstmt; 

   END IF;

 UNTIL done END REPEAT; 

 CLOSE cur; 

 SELECT 'OK' FROM DUAL;
 
END

The last line

SELECT 'OK' FROM DUAL 

will show you if the procedure will end correctly.

Compare the concat function to find your error.

When you have an error in procedure and you can't debug, try to remove lines of code and re execute it to find the offending line/s, or substitute the variable with constant to see if all works as expected.

To find your error I made the procedure return also the result of concat:

SELECT
CONCAT('ALTER TABLE `', tblname, '` CHANGE COLUMN `', oldname, '` `', @newname, '`', datatype)
FROM DUAL

So I found, also, that the statement you dynamically execute was incorrect.

F.

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