mysql实例：在存储过程中创建临时表并储存数据

在mysql存储过程中创建临时表，并保存数据到该表，然后根据存储过程调用的例子。
是学习mysql存储过程的好例子，值得参考。

代码：

mysql>
mysql> CREATE TABLE Employee( //创建普通表
    ->     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 (0.01 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; //查询数据
+------+------------+-----------+------------+------------+---------+-----------+-------------+
| 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 $$
mysql>
mysql> CREATE PROCEDURE myProc(in_id INT) //创建存储过程，带参存储过程
    ->     MODIFIES SQL DATA
    -> BEGIN
    ->     DECLARE l_employee_id INT;
    ->     DECLARE l_salary      NUMERIC(8,2);
    ->     DECLARE l_new_salary  NUMERIC(8,2);
    ->     DECLARE done          INT DEFAULT 0;
    ->
    ->     DECLARE cur1 CURSOR FOR
    ->             SELECT id, salary
    ->               FROM employee
    ->              WHERE id=in_id;
    ->
    ->     DECLARE CONTINUE HANDLER FOR NOT FOUND SET done=1;
    ->
    ->     CREATE TEMPORARY TABLE IF NOT EXISTS emp_raises
    ->       (employee_id INT, new_salary NUMERIC(8,2));
    ->
    ->     OPEN cur1;
    ->     emp_loop: LOOP
    ->
    ->       FETCH cur1 INTO l_employee_id, l_salary;
    ->
    ->       IF done=1 THEN       /* No more rows*/
    ->          LEAVE emp_loop;
    ->       END IF;
    ->
    ->       set l_new_salary = 1233.12;
    ->
    ->       UPDATE employee
    ->             SET salary=l_new_salary
    ->           WHERE id=l_employee_id;
    ->          /* Keep track of changed salaries*/
    ->          INSERT INTO emp_raises (employee_id,new_salary) //插入数据
    ->           VALUES (l_employee_id,l_new_salary);
    ->
    ->
    ->     END LOOP emp_loop;
    ->     CLOSE cur1;
    ->     /* Print out the changed salaries*/
    ->
    ->     SELECT id,salary from employee;
    ->
    ->     SELECT employee_id,new_salary from emp_raises
    ->      ORDER BY employee_id;
    -> END $$
Query OK, 0 rows affected (0.00 sec)

mysql>
mysql> DELIMITER ;
mysql> call myProc(1); //调用存储过程
+------+---------+
| id   | salary  |
+------+---------+
|    1 | 1233.12 |
|    2 | 6661.78 |
|    3 | 6544.78 |
|    4 | 2344.78 |
|    5 | 2334.78 |
|    6 | 4322.78 |
|    7 | 7897.78 |
|    8 | 1232.78 |
+------+---------+
8 rows in set (0.01 sec)

+-------------+------------+
| employee_id | new_salary |
+-------------+------------+
|           1 |    1233.12 |
+-------------+------------+
1 row in set (0.01 sec)

Query OK, 0 rows affected, 1 warning (0.01 sec)

mysql> drop procedure myProc; //删除存储过程
Query OK, 0 rows affected (0.00 sec)

mysql>
mysql>
mysql>
mysql>
mysql>
mysql> drop table Employee; //删除表
Query OK, 0 rows affected (0.00 sec)