Creating Procedures with INOUT Parameters

<< MySQL - JBDC CallableStatement

<< JDBC Tutorials - Herong's Tutorial Notes

This section describes how to create a procedure with INOUT parameters.

To do more tests on CallableStatement objects, I created another stored procedure with INOUT parameters:

C:\>\local\mysql\bin\mysql -u Herong -pTopSecret

mysql> USE HerongDB;
Database changed

mysql> -- Changing the command delimiter to '$'
mysql> DELIMITER '$';

mysql> -- Creating the procedure
mysql> CREATE PROCEDURE C2F(INOUT C REAL, INOUT F REAL)
    -> BEGIN
    ->   IF C IS NOT NULL THEN
    ->     SET F = 1.8*C + 32.0;
    ->   ELSEIF F IS NOT NULL THEN
    ->     SET C = (F-32.0)/1.8;
    ->   ELSE
    ->     SET C = 0.0;
    ->     SET F = 32.0;
    ->   END IF;
    ->   SELECT C, F;
    -> END$
Query OK, 0 rows affected (0.00 sec)

mysql> -- Testing the procedure
mysql> SET @C = 20$
Query OK, 0 rows affected (0.00 sec)

mysql> CALL C2F(@C,@F)$
+------+------+
| C    | F    |
+------+------+
|   20 |   68 |
+------+------+
1 row in set (0.00 sec)

Query OK, 0 rows affected (0.00 sec)

mysql> -- Checking output parameters
mysql> SELECT @C, @F$
+------+------+
| @C   | @F   |
+------+------+
| 20   | 68   |
+------+------+
1 row in set (0.00 sec)

Sections in This Chapter

Overview of CallableStatement Objects

"CREATE PROCEDURE" - Creating a Simple Procedure

Creating Procedures with IN and OUT Parameters

Creating Procedures with INOUT Parameters

Creating Procedures with Multiple Queries

Creating CallableStatement Objects with prepareCall()

Capturing ResultSet with executeQuery()

Creating CallableStatement Objects with Parameters

Common Errors with CallableStatement Parameters

Creating CallableStatement Objects with INOUT Parameters

Retrieving Multiple ResultSet Objects

Executing Stored Procedures without Permission

getProcedures() - Listing Stored Procedures