Question

我是存储过程的新手，下面是我的要求，我需要提出存储过程来为我的表（例如下面）填充过去4个月的数据，其中包含不同的T_KEY，A_KEY，M_KEY和G_KEY值。

mysql> select * from R_A_METRICS;  
+---------------------+------------+-----------------+-------+------------+  
| TIMESTAMP           |  T_KEY      | A_KEY           | M_KEY | G_KEY         

| 2017-06-30 00:00:00 |    a        | b               | c     | d                         
| 2017-06-30 00:15:00 |   a1        | b1              | c1    | d1

以下是填充4个月数据的示例程序，

PROCEDURE `POPULATE_A_METRICS`()  
BEGIN  
DECLARE START_DAY TIMESTAMP;  
DECLARE END_DAY TIMESTAMP;  
SET START_DAY = CURDATE() - INTERVAL 4 MONTH;  
SET END_DAY = CURDATE();  
WHILE (START_DAY <= END_DAY) DO  
insert into R_A_METRICS values(START_DAY,T_KEY,A_KEY,M_KEY,G_KEY);  
SET START_DAY = START_DAY + INTERVAL 15 MINUTE;  
END WHILE;  
END

我想将值设置为@ T_KEY = a，a1，a2并将其以循环方式插入到表中。对其他列的类似要求，如A_KEY，M_KEY，G_KEY

关于如何通过存储过程实现这一点的任何想法？

TIA

Answer 1

要创建一系列插入的值，如a，a1，a2，您必须具有临时值并存储要存储的当前序列：

delimiter $$
DROP PROCEDURE  IF EXISTS `POPULATE_A_METRICS`$$
CREATE PROCEDURE `POPULATE_A_METRICS`()  
BEGIN  
    DECLARE START_DAY TIMESTAMP;  
    DECLARE END_DAY TIMESTAMP;  

    SET START_DAY = CURDATE() - INTERVAL 4 MONTH;  
    SET END_DAY = CURDATE();  

    set @counter = '';  /*a counter, blank at first*/
    set @T_KEY = 'a';
    set @A_KEY = 'b';
    set @M_KEY = 'c';
    set @G_KEY = 'd';

    WHILE (START_DAY <= END_DAY) DO  

        insert into R_A_METRICS (`TIMESTAMP`,T_KEY,A_KEY,M_KEY,G_KEY)
        values (START_DAY,@T_KEY,@A_KEY,@M_KEY,@G_KEY); 

        SET START_DAY = START_DAY + INTERVAL 15 MINUTE;  

        set @counter = @counter + 1 ; /*increase counter and concatenate bellow: */
        set @T_KEY = concat('a',@counter);
        set @A_KEY = concat('b',@counter);
        set @M_KEY = concat('c',@counter);
        set @G_KEY = concat('d',@counter);

    END WHILE;  
END$$

执行后你会得到：

mysql> SELECT `TIMESTAMP`,T_KEY,A_KEY,M_KEY,G_KEY FROM R_A_METRICS;
+---------------------+-------+-------+-------+-------+
| TIMESTAMP           | T_KEY | A_KEY | M_KEY | G_KEY |
+---------------------+-------+-------+-------+-------+
| 2017-11-02 20:00:00 | a     | b     | c     | d     |
| 2017-11-02 20:15:00 | a1    | b1    | c1    | d1    |
| 2017-11-02 20:30:00 | a2    | b2    | c2    | d2    |
| 2017-11-02 20:45:00 | a3    | b3    | c3    | d3    |
| 2017-11-02 21:00:00 | a4    | b4    | c4    | d4    |
| 2017-11-02 21:15:00 | a5    | b5    | c5    | d5    |
| 2017-11-02 21:30:00 | a6    | b6    | c6    | d6    |
| 2017-11-02 21:45:00 | a7    | b7    | c7    | d7    |
| 2017-11-02 22:00:00 | a8    | b8    | c8    | d8    |
| 2017-11-02 22:15:00 | a9    | b9    | c9    | d9    |

使用存储过程插入mutilpe值

1 个答案: