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How to use an OUT parameter / read data with SELECT from table in a MySQL procedure?
For this, you can use SELECT INTO. Let us first create a table −
mysql> create table DemoTable1860 ( Amount int ); Query OK, 0 rows affected (0.00 sec)
Insert some records in the table using insert command −
mysql> insert into DemoTable1860 values(1590); Query OK, 1 row affected (0.00 sec) mysql> insert into DemoTable1860 values(410); Query OK, 1 row affected (0.00 sec) mysql> insert into DemoTable1860 values(3000); Query OK, 1 row affected (0.00 sec)
Display all records from the table using select statement −
Mysql> select * from DemoTable1860;
This will produce the following output −
+--------+ | Amount | +--------+ | 1590 | | 410 | | 3000 | +--------+ 3 rows in set (0.00 sec)
Following is the query to create a stored procedure and use the OUT parameter −
mysql> delimiter // mysql> create procedure use_of_out_parameter(out TotalAmount int) begin select sum(Amount) into TotalAmount from DemoTable1860; end // Query OK, 0 rows affected (0.00 sec) mysql> delimiter ;
Call a stored procedure using call command −
mysql> call use_of_out_parameter(@TotalAmount); Query OK, 1 row affected (0.00 sec)
Now you can use the parameter variable −
mysql> select @TotalAmount;
This will produce the following output −
+--------------+ | @TotalAmount | +--------------+ | 5000 | +--------------+ 1 row in set (0.00 sec)
Updated on: 26-Dec-2019
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