Check input parameter : Parameters : Procedure Function SQL / MySQL


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Check input parameter


 
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 (0.02 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 (0.00 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 (0.02 sec)

mysql>
mysql>
mysql>
mysql> delimiter $$
mysql>
mysql> CREATE PROCEDURE sp_customer_search_dyn
    ->     (in_Description VARCHAR(30),
    ->      in_contact_surname VARCHAR(30),
    ->      in_contact_firstname VARCHAR(30),
    ->      in_city VARCHAR(10))
    ->
    -> BEGIN
    ->   DECLARE l_where_clause VARCHAR(1000DEFAULT 'WHERE';
    ->
    ->   IF in_Description IS NOT NULL THEN
    ->       SET l_where_clause=CONCAT(l_where_clause,
    ->          ' description="',in_Description,'"');
    ->   END IF;
    ->   select l_where_clause;
    ->   IF in_contact_surname IS NOT NULL THEN
    ->      IF l_where_clause<>'WHERE' THEN
    ->         SET l_where_clause=CONCAT(l_where_clause,' AND ');
    ->      END IF;
    ->      SET l_where_clause=CONCAT(l_where_clause,
    ->          ' last_name="',in_contact_surname,'"');
    ->   END IF;
    ->   select l_where_clause;
    ->
    ->   IF in_contact_firstname IS NOT NULL THEN
    ->      IF l_where_clause<>'WHERE' THEN
    ->         SET l_where_clause=CONCAT(l_where_clause,' AND ');
    ->      END IF;
    ->      SET l_where_clause=CONCAT(l_where_clause,
    ->          ' first_name="',in_contact_firstname,'"');
    ->   END IF;
    ->   select l_where_clause;
    ->
    ->   IF in_city IS NOT NULL THEN
    ->      IF l_where_clause<>'WHERE' THEN
    ->         SET l_where_clause=CONCAT(l_where_clause,' AND ');
    ->      END IF;
    ->      SET l_where_clause=CONCAT(l_where_clause,
    ->          ' city="',in_city,'"');
    ->   END IF;
    ->   select l_where_clause;
    ->
    ->   SET @sql=CONCAT('SELECT * FROM employee ', l_where_clause);
    ->
    ->   select @sql;
    ->
    ->   PREPARE s1 FROM @sql;
    ->   EXECUTE s1;
    ->   DEALLOCATE PREPARE s1;
    ->
    -> END$$
Query OK, rows affected (0.00 sec)

mysql>
mysql> delimiter ;
mysql> call sp_customer_search_dyn('Tester','Martin','Jason','Toronto');
+----------------------------+
| l_where_clause             |
+----------------------------+
WHERE description="Tester" |
+----------------------------+
row in set (0.02 sec)

+----------------------------------------------------+
| l_where_clause                                     |
+----------------------------------------------------+
WHERE description="Tester" AND  last_name="Martin" |
+----------------------------------------------------+
row in set (0.02 sec)

+----------------------------------------------------------------------------+
| l_where_clause                                                             |
+----------------------------------------------------------------------------+
WHERE description="Tester" AND  last_name="Martin" AND  first_name="Jason" |
+----------------------------------------------------------------------------+
row in set (0.02 sec)

+------------------------------------------------------------------------------------------------+
| l_where_clause                                                                                 |
+------------------------------------------------------------------------------------------------+
WHERE description="Tester" AND  last_name="Martin" AND  first_name="Jason" AND  city="Toronto" |
+------------------------------------------------------------------------------------------------+
row in set (0.24 sec)

+-----------------------------------------------------------------------------------------------------------------------+
| @sql                                                                                                                  |
+-----------------------------------------------------------------------------------------------------------------------+
SELECT FROM employee WHERE description="Tester" AND  last_name="Martin" AND  first_name="Jason" AND  city="Toronto" |
+-----------------------------------------------------------------------------------------------------------------------+
row in set (0.24 sec)

Empty set (0.24 sec)

Query OK, rows affected (0.24 sec)

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

mysql>
mysql>
mysql>
mysql>
mysql>
mysql> drop table Employee;
Query OK, rows affected (0.00 sec)

        



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