MySQL Tutorial/Procedure Function/Predefined Exceptions

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DECLARE CONTINUE HANDLER FOR command_denied

   <source lang="sql">

mysql> 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, 0 rows affected (0.03 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, 1 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, 1 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, 1 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, 1 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, 1 row affected (0.01 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, 1 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, 1 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, 1 row affected (0.00 sec) mysql> mysql> select * from Employee; +------+------------+-----------+------------+------------+---------+-----------+-------------+ | id | first_name | last_name | start_date | end_date | salary | city | description | +------+------------+-----------+------------+------------+---------+-----------+-------------+ | 1 | Jason | Martin | 1996-07-25 | 2006-07-25 | 1234.56 | Toronto | Programmer | | 2 | Alison | Mathews | 1976-03-21 | 1986-02-21 | 6661.78 | Vancouver | Tester | | 3 | James | Smith | 1978-12-12 | 1990-03-15 | 6544.78 | Vancouver | Tester | | 4 | Celia | Rice | 1982-10-24 | 1999-04-21 | 2344.78 | Vancouver | Manager | | 5 | Robert | Black | 1984-01-15 | 1998-08-08 | 2334.78 | Vancouver | Tester | | 6 | Linda | Green | 1987-07-30 | 1996-01-04 | 4322.78 | New York | Tester | | 7 | David | Larry | 1990-12-31 | 1998-02-12 | 7897.78 | New York | Manager | | 8 | James | Cat | 1996-09-17 | 2002-04-15 | 1232.78 | Vancouver | Tester | +------+------------+-----------+------------+------------+---------+-----------+-------------+ 8 rows in set (0.05 sec) mysql> mysql> mysql> mysql> mysql> delimiter $$ mysql> mysql> CREATE PROCEDURE myProc (in_id INT) 

   ->       SQL SECURITY INVOKER
   -> BEGIN
   ->       DECLARE denied INT DEFAULT 0;
   ->
   ->       DECLARE command_denied CONDITION FOR 1142;
   ->       DECLARE CONTINUE HANDLER FOR command_denied SET denied=1;
   ->
   ->       SELECT first_name, last_name
   ->         FROM employee
   ->        WHERE id=4;
   ->
   ->       IF denied =1 THEN
   ->             SELECT "You may not view customer data."
   ->                 AS "Permission Denied";
   ->       END IF;
   -> END$$

Query OK, 0 rows affected (0.00 sec) mysql> mysql> delimiter ; mysql> call myProc(1); +------------+-----------+ | first_name | last_name | +------------+-----------+ | Celia | Rice | +------------+-----------+ 1 row in set (0.00 sec) Query OK, 0 rows affected (0.00 sec) mysql> drop procedure myProc; Query OK, 0 rows affected (0.00 sec) mysql> mysql> mysql> mysql> mysql> drop table Employee; Query OK, 0 rows affected (0.00 sec) mysql> mysql></source>


DECLARE CONTINUE HANDLER FOR duplicate_key

   <source lang="sql">

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, 0 rows affected (0.00 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, 1 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, 1 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, 1 row affected (0.02 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, 1 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, 1 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, 1 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, 1 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, 1 row affected (0.00 sec) mysql> mysql> select * from Employee; +------+------------+-----------+------------+------------+---------+-----------+-------------+ | id | first_name | last_name | start_date | end_date | salary | city | description | +------+------------+-----------+------------+------------+---------+-----------+-------------+ | 1 | Jason | Martin | 1996-07-25 | 2006-07-25 | 1234.56 | Toronto | Programmer | | 2 | Alison | Mathews | 1976-03-21 | 1986-02-21 | 6661.78 | Vancouver | Tester | | 3 | James | Smith | 1978-12-12 | 1990-03-15 | 6544.78 | Vancouver | Tester | | 4 | Celia | Rice | 1982-10-24 | 1999-04-21 | 2344.78 | Vancouver | Manager | | 5 | Robert | Black | 1984-01-15 | 1998-08-08 | 2334.78 | Vancouver | Tester | | 6 | Linda | Green | 1987-07-30 | 1996-01-04 | 4322.78 | New York | Tester | | 7 | David | Larry | 1990-12-31 | 1998-02-12 | 7897.78 | New York | Manager | | 8 | James | Cat | 1996-09-17 | 2002-04-15 | 1232.78 | Vancouver | Tester | +------+------------+-----------+------------+------------+---------+-----------+-------------+ 8 rows in set (0.00 sec) mysql> mysql> mysql> mysql> delimiter $$ mysql> mysql> CREATE PROCEDURE myProc 

   ->     (p_first_name          VARCHAR(30),
   ->       p_last_name           VARCHAR(30),
   ->       p_city                VARCHAR(30),
   ->       p_description         VARCHAR(30),
   ->       OUT p_sqlcode         INT,
   ->       OUT p_status_message  VARCHAR(100))
   -> BEGIN
   ->
   -> /* START Declare Conditions */
   ->
   ->   DECLARE duplicate_key CONDITION FOR 1062;
   ->   DECLARE foreign_key_violated CONDITION FOR 1216;
   ->
   -> /* END Declare Conditions */
   ->
   -> /* START Declare variables and cursors */
   ->
   ->      DECLARE l_manager_id       INT;
   ->
   ->      DECLARE csr_mgr_id CURSOR FOR
   ->       SELECT id
   ->         FROM employee
   ->        WHERE first_name=p_first_name
   ->              AND last_name=p_last_name;
   ->
   -> /* END Declare variables and cursors */
   ->
   -> /* START Declare Exception Handlers */
   ->
   ->   DECLARE CONTINUE HANDLER FOR duplicate_key
   ->     BEGIN
   ->       SET p_sqlcode=1052;
   ->       SET p_status_message="Duplicate key error";
   ->     END;
   ->
   ->   DECLARE CONTINUE HANDLER FOR foreign_key_violated
   ->     BEGIN
   ->       SET p_sqlcode=1216;
   ->       SET p_status_message="Foreign key violated";
   ->     END;
   ->
   ->   DECLARE CONTINUE HANDLER FOR not FOUND
   ->     BEGIN
   ->       SET p_sqlcode=1329;
   ->       SET p_status_message="No record found";
   ->     END;
   ->
   -> /* END Declare Exception Handlers */
   ->
   -> /* START Execution */
   ->
   ->   SET p_sqlcode=0;
   ->   OPEN csr_mgr_id;
   ->   FETCH csr_mgr_id INTO l_manager_id;
   ->
   ->   IF p_sqlcode<>0 THEN           /* Failed to get manager id*/
   ->     SET p_status_message=CONCAT(p_status_message," when fetching manager id");
   ->   ELSE
   ->     INSERT INTO employee (first_name,id,city)
   ->     VALUES(p_first_name,l_manager_id,p_city);
   ->
   ->     IF p_sqlcode<>0 THEN     /* Failed to insert new department */
   ->       SET p_status_message=CONCAT(p_status_message,
   ->                            " when inserting new department");
   ->     END IF;
   ->   END IF;
   ->
   ->   CLOSE csr_mgr_id;
   ->
   -> /* END Execution */
   ->
   -> END$$

Query OK, 0 rows affected (0.02 sec) mysql> mysql> delimiter ; mysql> set @myCode = 0; Query OK, 0 rows affected (0.00 sec) mysql> set @myMessage = 0; Query OK, 0 rows affected (0.00 sec) mysql> mysql> call myProc("Jason","Martin","New City","New Description",@myCode,@myMessage); Query OK, 1 row affected (0.00 sec) mysql> mysql> select @myCode, @myMessage; +---------+------------+ | @myCode | @myMessage | +---------+------------+ | 0 | NULL | +---------+------------+ 1 row in set (0.00 sec) mysql> mysql> drop procedure myProc; Query OK, 0 rows affected (0.00 sec) mysql> mysql> select * from Employee; +------+------------+-----------+------------+------------+---------+-----------+-------------+ | id | first_name | last_name | start_date | end_date | salary | city | description | +------+------------+-----------+------------+------------+---------+-----------+-------------+ | 1 | Jason | Martin | 1996-07-25 | 2006-07-25 | 1234.56 | Toronto | Programmer | | 2 | Alison | Mathews | 1976-03-21 | 1986-02-21 | 6661.78 | Vancouver | Tester | | 3 | James | Smith | 1978-12-12 | 1990-03-15 | 6544.78 | Vancouver | Tester | | 4 | Celia | Rice | 1982-10-24 | 1999-04-21 | 2344.78 | Vancouver | Manager | | 5 | Robert | Black | 1984-01-15 | 1998-08-08 | 2334.78 | Vancouver | Tester | | 6 | Linda | Green | 1987-07-30 | 1996-01-04 | 4322.78 | New York | Tester | | 7 | David | Larry | 1990-12-31 | 1998-02-12 | 7897.78 | New York | Manager | | 8 | James | Cat | 1996-09-17 | 2002-04-15 | 1232.78 | Vancouver | Tester | | 1 | Jason | NULL | NULL | NULL | NULL | New City | NULL | +------+------------+-----------+------------+------------+---------+-----------+-------------+ 9 rows in set (0.00 sec) mysql> mysql> mysql> drop table Employee; Query OK, 0 rows affected (0.02 sec) mysql> mysql></source>


DECLARE CONTINUE HANDLER FOR foreign_key_violated

   <source lang="sql">

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, 0 rows affected (0.03 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, 1 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, 1 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, 1 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, 1 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, 1 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, 1 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, 1 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, 1 row affected (0.00 sec) mysql> mysql> select * from Employee; +------+------------+-----------+------------+------------+---------+-----------+-------------+ | id | first_name | last_name | start_date | end_date | salary | city | description | +------+------------+-----------+------------+------------+---------+-----------+-------------+ | 1 | Jason | Martin | 1996-07-25 | 2006-07-25 | 1234.56 | Toronto | Programmer | | 2 | Alison | Mathews | 1976-03-21 | 1986-02-21 | 6661.78 | Vancouver | Tester | | 3 | James | Smith | 1978-12-12 | 1990-03-15 | 6544.78 | Vancouver | Tester | | 4 | Celia | Rice | 1982-10-24 | 1999-04-21 | 2344.78 | Vancouver | Manager | | 5 | Robert | Black | 1984-01-15 | 1998-08-08 | 2334.78 | Vancouver | Tester | | 6 | Linda | Green | 1987-07-30 | 1996-01-04 | 4322.78 | New York | Tester | | 7 | David | Larry | 1990-12-31 | 1998-02-12 | 7897.78 | New York | Manager | | 8 | James | Cat | 1996-09-17 | 2002-04-15 | 1232.78 | Vancouver | Tester | +------+------------+-----------+------------+------------+---------+-----------+-------------+ 8 rows in set (0.00 sec) mysql> mysql> mysql> mysql> delimiter $$ mysql> mysql> CREATE PROCEDURE myProc 

   ->     (p_first_name          VARCHAR(30),
   ->       p_last_name           VARCHAR(30),
   ->       p_city                VARCHAR(30),
   ->       p_description         VARCHAR(30),
   ->       OUT p_sqlcode         INT,
   ->       OUT p_status_message  VARCHAR(100))
   -> BEGIN
   ->
   -> /* START Declare Conditions */
   ->
   ->   DECLARE duplicate_key CONDITION FOR 1062;
   ->   DECLARE foreign_key_violated CONDITION FOR 1216;
   ->
   -> /* END Declare Conditions */
   ->
   -> /* START Declare variables and cursors */
   ->
   ->      DECLARE l_manager_id       INT;
   ->
   ->      DECLARE csr_mgr_id CURSOR FOR
   ->       SELECT id
   ->         FROM employee
   ->        WHERE first_name=p_first_name
   ->              AND last_name=p_last_name;
   ->
   -> /* END Declare variables and cursors */
   ->
   -> /* START Declare Exception Handlers */
   ->
   ->   DECLARE CONTINUE HANDLER FOR duplicate_key
   ->     BEGIN
   ->       SET p_sqlcode=1052;
   ->       SET p_status_message="Duplicate key error";
   ->     END;
   ->
   ->   DECLARE CONTINUE HANDLER FOR foreign_key_violated
   ->     BEGIN
   ->       SET p_sqlcode=1216;
   ->       SET p_status_message="Foreign key violated";
   ->     END;
   ->
   ->   DECLARE CONTINUE HANDLER FOR not FOUND
   ->     BEGIN
   ->       SET p_sqlcode=1329;
   ->       SET p_status_message="No record found";
   ->     END;
   ->
   -> /* END Declare Exception Handlers */
   ->
   -> /* START Execution */
   ->
   ->   SET p_sqlcode=0;
   ->   OPEN csr_mgr_id;
   ->   FETCH csr_mgr_id INTO l_manager_id;
   ->
   ->   IF p_sqlcode<>0 THEN           /* Failed to get manager id*/
   ->     SET p_status_message=CONCAT(p_status_message," when fetching manager id");
   ->   ELSE
   ->     INSERT INTO employee (first_name,id,city)
   ->     VALUES(p_first_name,l_manager_id,p_city);
   ->
   ->     IF p_sqlcode<>0 THEN     /* Failed to insert new department */
   ->       SET p_status_message=CONCAT(p_status_message,
   ->                            " when inserting new department");
   ->     END IF;
   ->   END IF;
   ->
   ->   CLOSE csr_mgr_id;
   ->
   -> /* END Execution */
   ->
   -> END$$

Query OK, 0 rows affected (0.02 sec) mysql> mysql> delimiter ; mysql> set @myCode = 0; Query OK, 0 rows affected (0.00 sec) mysql> set @myMessage = 0; Query OK, 0 rows affected (0.00 sec) mysql> mysql> call myProc("Jason","Martin","New City","New Description",@myCode,@myMessage); Query OK, 1 row affected (0.01 sec) mysql> mysql> select @myCode, @myMessage; +---------+------------+ | @myCode | @myMessage | +---------+------------+ | 0 | NULL | +---------+------------+ 1 row in set (0.00 sec) mysql> mysql> drop procedure myProc; Query OK, 0 rows affected (0.00 sec) mysql> mysql> select * from Employee; +------+------------+-----------+------------+------------+---------+-----------+-------------+ | id | first_name | last_name | start_date | end_date | salary | city | description | +------+------------+-----------+------------+------------+---------+-----------+-------------+ | 1 | Jason | Martin | 1996-07-25 | 2006-07-25 | 1234.56 | Toronto | Programmer | | 2 | Alison | Mathews | 1976-03-21 | 1986-02-21 | 6661.78 | Vancouver | Tester | | 3 | James | Smith | 1978-12-12 | 1990-03-15 | 6544.78 | Vancouver | Tester | | 4 | Celia | Rice | 1982-10-24 | 1999-04-21 | 2344.78 | Vancouver | Manager | | 5 | Robert | Black | 1984-01-15 | 1998-08-08 | 2334.78 | Vancouver | Tester | | 6 | Linda | Green | 1987-07-30 | 1996-01-04 | 4322.78 | New York | Tester | | 7 | David | Larry | 1990-12-31 | 1998-02-12 | 7897.78 | New York | Manager | | 8 | James | Cat | 1996-09-17 | 2002-04-15 | 1232.78 | Vancouver | Tester | | 1 | Jason | NULL | NULL | NULL | NULL | New City | NULL | +------+------------+-----------+------------+------------+---------+-----------+-------------+ 9 rows in set (0.00 sec) mysql> mysql> mysql> drop table Employee; Query OK, 0 rows affected (0.02 sec) mysql> mysql></source>

Источник — «http://sqle.ru/index.php?title=MySQL_Tutorial/Procedure_Function/Predefined_Exceptions&oldid=765»