Nested blocks : Variable Scope « Procedure Function « SQL / MySQL

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SQL / MySQL » Procedure Function » Variable Scope 
Nested blocks
 
mysql>
mysql> delimiter $$
mysql>
mysql> CREATE PROCEDURE myProc()
    -> BEGIN
    ->         DECLARE my_variable VARCHAR(20);
    ->         SET my_variable='This value was set in the outer block';
    ->         BEGIN
    ->                 DECLARE my_variable VARCHAR(20);
    ->                 SET my_variable='This value was set in the inner block';
    ->         END;
    ->         SELECT my_variable, 'Can''t see changes made in the inner block';
    -> END$$
Query OK, rows affected (0.02 sec)

mysql> delimiter ;
mysql>
mysql> call myProc();
+----------------------+-------------------------------------------+
| my_variable          | Can't see changes made in the inner block |
+----------------------+-------------------------------------------+
| This value was set i | Can't see changes made in the inner block |
+----------------------+-------------------------------------------+
row in set (0.00 sec)

Query OK, rows affected, warnings (0.00 sec)

mysql> drop procedure myProc;
Query OK, rows affected (0.02 sec)

mysql>
mysql>

        
Related examples in the same category
1. LOCAL, SESSION, AND GLOBAL VARIABLES IN MYSQL
2. Variable scope
3. Inner variable shadows the outter variable
4. Using Declare statement to declare the local variable
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