Prepared SQL Statement Syntax

Posted 2020-08-25 rsapaper

 

http://dev.mysql.com/doc/refman/5.7/en/sql-syntax-prepared-statements.html

 

1 CREATE TABLE t1 (a INT NOT NULL);
2 INSERT INTO t1 VALUES (4), (8), (11), (32), (80);
3 SET @table = ‘t1‘;
4 SET @s = CONCAT(‘SELECT * FROM ‘, @table);
5 PREPARE stmt3 FROM @s;
6 EXECUTE stmt3;

 

 

1 SET @s = ‘SELECT SQRT(POW(?,2) + POW(?,2)) AS hypotenuse‘;
2 PREPARE stmt2 FROM @s;
3 SET @a = 6;
4 SET @b = 8;
5 EXECUTE stmt2 USING @a, @b;

 

 

1 PREPARE stmt1 FROM ‘SELECT SQRT(POW(?,2) + POW(?,2)) AS hypotenuse‘;
2 SET @a = 3;
3 SET @b = 4;
4 EXECUTE stmt1 USING @a, @b;
5 SHOW VARIABLES LIKE ‘%a%‘;