Checking Exit flag : Condition HANDLER « Procedure Function « SQL / MySQL

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SQL / MySQL » Procedure Function » Condition HANDLER 
Checking Exit flag
 
mysql>
mysql>
mysql> CREATE TABLE Employee(
    ->     id            int,
    ->     first_name    VARCHAR(15),
    ->     last_name     VARCHAR(15),
    ->     start_date    DATE,
    ->     end_date      DATE,
    ->     salary        FLOAT(8,2),
    ->     city          VARCHAR(10),
    ->     description   VARCHAR(15)
    -> );
Query OK, rows affected (0.08 sec)

mysql>
mysql>
mysql> insert into Employee(id,first_name, last_name, start_date, end_Date,   salary,  City,       Description)
    ->              values (1,'Jason',    'Martin',  '19960725',  '20060725', 1234.56'Toronto',  'Programmer');
Query OK, row affected (0.00 sec)

mysql>
mysql> insert into Employee(id,first_name, last_name, start_date, end_Date,   salary,  City,       Description)
    ->               values(2,'Alison',   'Mathews',  '19760321', '19860221', 6661.78'Vancouver','Tester');
Query OK, row affected (0.00 sec)

mysql>
mysql> insert into Employee(id,first_name, last_name, start_date, end_Date,   salary,  City,       Description)
    ->               values(3,'James',    'Smith',    '19781212', '19900315', 6544.78'Vancouver','Tester');
Query OK, row affected (0.00 sec)

mysql>
mysql> insert into Employee(id,first_name, last_name, start_date, end_Date,   salary,  City,       Description)
    ->               values(4,'Celia',    'Rice',     '19821024', '19990421', 2344.78'Vancouver','Manager');
Query OK, row affected (0.00 sec)

mysql>
mysql> insert into Employee(id,first_name, last_name, start_date, end_Date,   salary,  City,       Description)
    ->               values(5,'Robert',   'Black',    '19840115', '19980808', 2334.78'Vancouver','Tester');
Query OK, row affected (0.00 sec)

mysql>
mysql> insert into Employee(id,first_name, last_name, start_date, end_Date,   salary,  City,       Description)
    ->               values(6,'Linda',    'Green',    '19870730', '19960104', 4322.78,'New York',  'Tester');
Query OK, row affected (0.00 sec)

mysql>
mysql> insert into Employee(id,first_name, last_name, start_date, end_Date,   salary,  City,       Description)
    ->               values(7,'David',    'Larry',    '19901231', '19980212', 7897.78,'New York',  'Manager');
Query OK, row affected (0.00 sec)

mysql>
mysql> insert into Employee(id,first_name, last_name, start_date, end_Date,   salary,  City,       Description)
    ->               values(8,'James',    'Cat',     '19960917',  '20020415', 1232.78,'Vancouver', 'Tester');
Query OK, row affected (0.02 sec)

mysql>
mysql> select from Employee;
+------+------------+-----------+------------+------------+---------+-----------+-------------+
| id   | first_name | last_name | start_date | end_date   | salary  | city      | description |
+------+------------+-----------+------------+------------+---------+-----------+-------------+
|    | Jason      | Martin    | 1996-07-25 2006-07-25 1234.56 | Toronto   | Programmer  |
|    | Alison     | Mathews   | 1976-03-21 1986-02-21 6661.78 | Vancouver | Tester      |
|    | James      | Smith     | 1978-12-12 1990-03-15 6544.78 | Vancouver | Tester      |
|    | Celia      | Rice      | 1982-10-24 1999-04-21 2344.78 | Vancouver | Manager     |
|    | Robert     | Black     | 1984-01-15 1998-08-08 2334.78 | Vancouver | Tester      |
|    | Linda      | Green     | 1987-07-30 1996-01-04 4322.78 | New York  | Tester      |
|    | David      | Larry     | 1990-12-31 1998-02-12 7897.78 | New York  | Manager     |
|    | James      | Cat       | 1996-09-17 2002-04-15 1232.78 | Vancouver | Tester      |
+------+------------+-----------+------------+------------+---------+-----------+-------------+
rows in set (0.00 sec)

mysql>
mysql>
mysql>
mysql> delimiter $$
mysql>
mysql> CREATE PROCEDURE myProc
    ->       (in_first_name VARCHAR(30),
    ->        in_city       VARCHAR(30),
    ->        in_id         INT)
    ->     MODIFIES SQL DATA
    -> BEGIN
    ->     DECLARE duplicate_key INT DEFAULT 0;
    ->     BEGIN
    ->           DECLARE EXIT HANDLER FOR 1062 /* Duplicate key*/ SET duplicate_key=1;
    ->
    ->           INSERT INTO employee (first_name,city,id)
    ->            VALUES(in_first_name,in_city,in_id);
    ->
    ->           SELECT CONCAT('Employee ',in_first_name,' created') as "Result";
    ->      END;
    ->
    ->      IF duplicate_key=THEN
    ->           SELECT CONCAT('Failed to insert ',in_first_name,
    ->                        ': duplicate key') as "Result";
    ->      END IF;
    -> END$$
Query OK, rows affected (0.00 sec)

mysql>
mysql> delimiter ;
mysql> call myProc('new FirstName','New City',999 );
+--------------------------------+
| Result                         |
+--------------------------------+
| Employee new FirstName created |
+--------------------------------+
row in set (0.00 sec)

Query OK, rows affected (0.00 sec)

mysql> drop procedure myProc;
Query OK, rows affected (0.00 sec)

mysql>
mysql>
mysql> select from Employee;
+------+---------------+-----------+------------+------------+---------+-----------+-------------+
| id   | first_name    | last_name | start_date | end_date   | salary  | city      | description |
+------+---------------+-----------+------------+------------+---------+-----------+-------------+
|    | Jason         | Martin    | 1996-07-25 2006-07-25 1234.56 | Toronto   | Programmer  |
|    | Alison        | Mathews   | 1976-03-21 1986-02-21 6661.78 | Vancouver | Tester      |
|    | James         | Smith     | 1978-12-12 1990-03-15 6544.78 | Vancouver | Tester      |
|    | Celia         | Rice      | 1982-10-24 1999-04-21 2344.78 | Vancouver | Manager     |
|    | Robert        | Black     | 1984-01-15 1998-08-08 2334.78 | Vancouver | Tester      |
|    | Linda         | Green     | 1987-07-30 1996-01-04 4322.78 | New York  | Tester      |
|    | David         | Larry     | 1990-12-31 1998-02-12 7897.78 | New York  | Manager     |
|    | James         | Cat       | 1996-09-17 2002-04-15 1232.78 | Vancouver | Tester      |
|  999 new FirstName | NULL      | NULL       | NULL       |    NULL | New City  | NULL        |
+------+---------------+-----------+------------+------------+---------+-----------+-------------+
rows in set (0.00 sec)

mysql>
mysql>
mysql> drop table Employee;
Query OK, rows affected (0.01 sec)

mysql>

        
Related examples in the same category
1.Declaring a Condition and Handler
2.Declaring a Condition and Handler in action
3.DECLARE CONTINUE HANDLER FOR NOT FOUND SET
4.Checking flag
5.Using while to check the condition
6.DECLARE EXIT HANDLER FOR
7.Using the IF statement to verify 'CONTINUE HANDLER'
8.The example associates a handler with SQLSTATE 23000, which occurs for a duplicate-key error
9.To ignore a condition
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