錯誤的程序

Question

DELIMITER $$ 

CREATE PROCEDURE `SearchUserX`(IN columnName VARCHAR(28) , IN search INT) 
BEGIN 
     DECLARE finished INT DEFAULT FALSE ; 
     DECLARE tableName VARCHAR (28) ; 
     DECLARE stmtFields TEXT ; 

    DECLARE tableNames CURSOR FOR 
       SELECT DISTINCT`TABLE_NAME` FROM `information_schema`.`COLUMNS` 
       WHERE `COLUMN_NAME` = columnName AND TABLE_SCHEMA = 'comments' ORDER BY `ORDINAL_POSITION` ; 
     DECLARE CONTINUE HANDLER FOR NOT FOUND SET finished = TRUE; 
     SET stmtFields = '' ; 
     OPEN tableNames; 
     readTables: LOOP 
       FETCH tableNames INTO tableName ; 
       IF finished THEN 
        LEAVE readTables ; 
       END IF; 
       SET stmtFields = CONCAT(
        stmtFields , IF (LENGTH(stmtFields) > 0 , ' AND' , '' ) , 
        ' `', tableName ,'`.`' , columnName , '`= ' , search ,'') ; 
     END LOOP; 
     SET @stmtQuery=CONCAT('SELECT * FROM `' , tableName , '` WHERE ' , stmtFields) ; 
     PREPARE stmt FROM @stmtQuery ; 
     EXECUTE stmt ; 
     CLOSE tableNames ; 
END 

我有錯誤可以有人幫助我：

0 11:42:47 call SearchUserX('UserId',2) Error Code: 1054. Unknown column 'TabExample.UserId' in 'where clause' 

或我有在clausure語法問題stmtFields

Answer 1

的錯誤說：

未知列'Where子句'中的'TabExample.UserId'

您需要在表TabExample中添加第UserId列。