Question

I need to get all names of tables that match with the regex and for that value given do an update query, to do this I created the following MySQL procedure but MySQL tells me that I have an error at line 3

I have the following MySql procedure:

CREATE PROCEDURE example()
BEGIN
    DECLARE bdone INT;
    DECLARE var1 VARCHAR(250);
    DECLARE curs CURSOR FOR  SHOW tables like '%contenidos_extra%';
    DECLARE CONTINUE HANDLER FOR NOT FOUND SET bDone = 1;
    OPEN curs;
    SET bdone = 0;
    REPEAT
        FETCH curs INTO var1,, b;
        UPDATE var1 SET `valor`='modified' WHERE nombre = 'prueba';
    UNTIL bdone END REPEAT;
    CLOSE curs;
END

mysql tells me that error:

#1064 - You have an error in your SQL syntax; check the manual that corresponds to your MySQL server version for the right syntax to use near '' at line 3

Answer 1

You need to change the delimiter before writing the procedure:

delimiter //

CREATE PROCEDURE example()
BEGIN
    DECLARE bdone INT;
    DECLARE var1 VARCHAR(250);
    DECLARE curs CURSOR FOR  select table_name from information_schema.tables where table_name like '%contenidos_extra%';
    DECLARE CONTINUE HANDLER FOR NOT FOUND SET bDone = 1;
    OPEN curs;
    SET bdone = 0;
    REPEAT
        FETCH curs INTO var1;
        UPDATE var1 SET `valor`='modified' WHERE nombre = 'prueba';
    UNTIL bdone END REPEAT;
    CLOSE curs;
END
//

delimiter ;

Note you can't use SHOW tables in a procedure.

See here: http://dev.mysql.com/doc/refman/5.7/en/stored-programs-defining.html

I've just re-read this code and realised you have another problem. You will need to perform the updates using dynamic SQL as you can't specify a table name in a variable. You must use dynamic SQL statements for this:

How To have Dynamic SQL in MySQL Stored Procedure

MySQL procedure not working (correction)

1 个答案: