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Implement Conditional MySQL Query in a stored procedure?
For conditional MySQL query, you can use IF ELSE concept in stored procedure. Let us first create a table −
mysql> create table DemoTable1 ( Id int ); Query OK, 0 rows affected (0.62 sec)
Insert some records in the table using insert command −
mysql> insert into DemoTable1 values(10); Query OK, 1 row affected (0.19 sec) mysql> insert into DemoTable1 values(20); Query OK, 1 row affected (0.12 sec) mysql> insert into DemoTable1 values(30); Query OK, 1 row affected (0.12 sec)
Display all records from the table using select statement −
mysql> select *from DemoTable1;
This will produce the following output −
+------+ | Id | +------+ | 10 | | 20 | | 30 | +------+ 3 rows in set (0.00 sec)
Following is the query to create second table.
mysql> create table DemoTable2 ( Id int ); Query OK, 0 rows affected (1.07 sec)
Insert some records in the table using insert command −
mysql> insert into DemoTable2 values(40); Query OK, 1 row affected (0.13 sec) mysql> insert into DemoTable2 values(50); Query OK, 1 row affected (0.17 sec) mysql> insert into DemoTable2 values(60); Query OK, 1 row affected (0.11 sec)
Display all records from the table using select statement −
mysql> select *from DemoTable2;
This will produce the following output −
+------+ | Id | +------+ | 40 | | 50 | | 60 | +------+ 3 rows in set (0.00 sec)
Following is the query to create a stored procedure for conditional MySQL query.
mysql> DELIMITER //
mysql> CREATE PROCEDURE Conditional_Query(id int)
BEGIN
IF id >=40 THEN
Select * from DemoTable2;
ELSE
Select * from DemoTable1;
END IF;
END
//
Query OK, 0 rows affected (0.21 sec)
mysql> DELIMITER ;Now you can call the stored procedure with the help of CALL command −
mysql> call Conditional_Query(100);
This will produce the following output −
+------+ | Id | +------+ | 40 | | 50 | | 60 | +------+ 3 rows in set (0.00 sec) Query OK, 0 rows affected (0.03 sec)
Call again and pass a different value −
mysql> call Conditional_Query(13);
This will produce the following output −
+------+ | Id | +------+ | 10 | | 20 | | 30 | +------+ 3 rows in set (0.00 sec) Query OK, 0 rows affected (0.02 sec)
Updated on: 30-Jul-2019
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