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Create a procedure in MySQL with parameters?
You can create a parameter using IN and OUT. IN is used to take input parameter and OUT can be used for output.
The syntax is as follows
DELIMITER // CREATE PROCEDURE yourProcedureName(IN yourParameterName dataType,OUT yourParameterName dataType ) BEGIN yourStatement1; yourStatement2; . . N END; // DELIMITER ;
First, we will create a table. The query to create a table is as follows
mysql> create table SumOfAll -> ( -> Amount int -> ); Query OK, 0 rows affected (0.78 sec)
Insert some records in the table using insert command. The query is as follows
mysql> insert into SumOfAll values(100); Query OK, 1 row affected (0.18 sec) mysql> insert into SumOfAll values(330); Query OK, 1 row affected (0.24 sec) mysql> insert into SumOfAll values(450); Query OK, 1 row affected (0.10 sec) mysql> insert into SumOfAll values(400); Query OK, 1 row affected (0.20 sec)
Display all records from the table using select statement. The query is as follows
mysql> select *from SumOfAll;
The following is the output
+--------+ | Amount | +--------+ | 100 | | 330 | | 450 | | 400 | +--------+ 4 rows in set (0.00 sec)
Now, we will create a stored procedure that will check the value is present in the table or not. If the given value is not present in the table then you will get a NULL value.
The stored procedure is as follows
mysql> DELIMITER // mysql> create procedure sp_ChechValue(IN value1 int,OUT value2 int) -> begin -> set value2=(select Amount from SumOfAll where Amount=value1); -> end; -> // Query OK, 0 rows affected (0.20 sec) mysql> delimiter ;
Let us call the stored procedure with some value and store the output in a session variable.
Case 1: When the value is not present in the table.
mysql> call sp_ChechValue(300,@isPresent); Query OK, 0 rows affected (0.00 sec)
Now check the value in a variable @isPresent using the select statement. The query is as follows
mysql> select @isPresent;
The following is the output
+------------+ | @isPresent | +------------+ | NULL | +------------+ 1 row in set (0.00 sec)
Case 2: When the value is present.
The query is as follows. Let us call the stored procedure
mysql> call sp_ChechValue(330,@isPresent); Query OK, 0 rows affected (0.00 sec)
Check the value of a session variable @isPresent. The query is as follows
mysql> select @isPresent;
The following is the output
+------------+ | @isPresent | +------------+ | 330 | +------------+ 1 row in set (0.00 sec)
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