Question

我正在尝试使用这样的分隔符在MySQL中创建存储过程：

use am;

DELIMITER $$

CREATE PROCEDURE addfields()
BEGIN
  DECLARE done INT DEFAULT FALSE;
  DECLARE acc INT(16);
  DECLARE validId INT DEFAULT 0;

END $$

DELIMITER ;

它给了我一个错误：

#1304 - PROCEDURE addfields already exists

使用分隔符创建存储过程的正确语法是什么，如果它首先存在则删除它？

Answer 1

MySQL中的存储过程语法入门：

优秀的程序员使用终端，GUI让你在中间变得柔软。当你习惯它并记住命令时，它比任何GUI快5倍。生产力=成功。

<强> 1。打开终端并登录mysql，如下所示：

el@apollo:~$ mysql -u root -p
Enter password: 
Welcome to the MySQL monitor.  Commands end with ; or \g.
mysql>

<强> 2。看看你是否有任何程序：

mysql> show procedure status;
+-----------+---------------+-----------+---------+---------------------+---------------------+---------------+---------+----------------------+----------------------+--------------------+
| Db        | Name          | Type      | Definer | Modified            | Created             | Security_type | Comment | character_set_client | collation_connection | Database Collation |
+-----------+---------------+-----------+---------+---------------------+---------------------+---------------+---------+----------------------+----------------------+--------------------+
|   yourdb  | sp_user_login | PROCEDURE | root@%  | 2013-12-06 14:10:25 | 2013-12-06 14:10:25 | DEFINER       |         | utf8                 | utf8_general_ci      | latin1_swedish_ci  |
+-----------+---------------+-----------+---------+---------------------+---------------------+---------------+---------+----------------------+----------------------+--------------------+
1 row in set (0.01 sec)

我有一个定义，你可能没有开始。

第3。切换到数据库，删除它。

mysql> use yourdb;
Database changed

mysql> drop procedure if exists sp_user_login;
Query OK, 0 rows affected (0.01 sec)

mysql> show procedure status;
Empty set (0.00 sec)

<强> 4。好的，现在我没有定义存储过程。做最简单的一个：

mysql> delimiter //
mysql> create procedure foobar()
    -> begin select 'hello'; end//
Query OK, 0 rows affected (0.00 sec)

当您输入存储过程的命令时，//将与终端通信。存储过程名称为foobar。它不需要参数，应该返回“你好”。

<强> 5。看看它是否在那里，记得放回你的分隔符！：

 mysql> show procedure status;
 -> 
 ->

疑难杂症！为什么这不起作用？您将分隔符设置为//还记得吗？将其重新设置为;

<强> 6。重新设置分隔符并查看过程：

mysql> delimiter ;
mysql> show procedure status;
+-----------+--------+-----------+----------------+---------------------+---------------------+---------------+---------+----------------------+----------------------+--------------------+
| Db        | Name   | Type      | Definer        | Modified            | Created             | Security_type | Comment | character_set_client | collation_connection | Database Collation |
+-----------+--------+-----------+----------------+---------------------+---------------------+---------------+---------+----------------------+----------------------+--------------------+
| yourdb    | foobar | PROCEDURE | root@localhost | 2013-12-06 14:27:23 | 2013-12-06 14:27:23 | DEFINER       |         | utf8                 | utf8_general_ci      | latin1_swedish_ci  |
+-----------+--------+-----------+----------------+---------------------+---------------------+---------------+---------+----------------------+----------------------+--------------------+
1 row in set (0.00 sec)

<强> 7。运行它：

mysql> call foobar();
+-------+
| hello |
+-------+
| hello |
+-------+
1 row in set (0.00 sec)
Query OK, 0 rows affected (0.00 sec)

Hello world complete，让我们用更好的东西覆盖它。

<强> 8。删除foobar，重新定义它以接受参数，然后重新运行它：

mysql> drop procedure foobar;
Query OK, 0 rows affected (0.00 sec)

mysql> show procedure status;
Empty set (0.00 sec)

mysql> delimiter //
mysql> create procedure foobar (in var1 int)
    -> begin select var1 + 2 as result;
    -> end//
Query OK, 0 rows affected (0.00 sec)

mysql> delimiter ;
mysql> call foobar(5);
+--------+
| result |
+--------+
|      7 |
+--------+
1 row in set (0.00 sec)
Query OK, 0 rows affected (0.00 sec)

尼斯！我们制作了一个接受输入，修改它并输出的过程。现在让我们做一个变量。

<强> 9。删除foobar，创建一个变量，运行它：

mysql> delimiter ;
mysql> drop procedure foobar;
Query OK, 0 rows affected (0.00 sec)

mysql> delimiter //
mysql> create procedure foobar(out var1 varchar(100))
    -> begin set var1="kowalski, what's the status of the nuclear reactor?";
    -> end//
Query OK, 0 rows affected (0.00 sec)


mysql> delimiter ;
mysql> call foobar(@kowalski_status);
Query OK, 0 rows affected (0.00 sec)

mysql> select @kowalski_status;
+-----------------------------------------------------+
| @kowalski_status                                    |
+-----------------------------------------------------+
| kowalski, what's the status of the nuclear reactor? |
+-----------------------------------------------------+
1 row in set (0.00 sec)

<强> 10。在MySQL中使用INOUT的示例：

mysql> select 'ricksays' into @msg;
Query OK, 1 row affected (0.00 sec)


mysql> delimiter //
mysql> create procedure foobar (inout msg varchar(100))
-> begin
-> set msg = concat(@msg, " never gonna let you down");
-> end//


mysql> delimiter ;


mysql> call foobar(@msg);
Query OK, 0 rows affected (0.00 sec)


mysql> select @msg;
+-----------------------------------+
| @msg                              |
+-----------------------------------+
| ricksays never gonna let you down |
+-----------------------------------+
1 row in set (0.00 sec)

好的，它有效，它加在一起。因此，您定义了一个变量msg，将该变量传递给名为foobar的存储过程，并且@msg由foobar写入。

现在您知道如何使用分隔符创建存储过程。继续本教程，从存储过程中的变量开始：http://net.tutsplus.com/tutorials/an-introduction-to-stored-procedures/

Answer 2

以下是带有分隔符的示例 MYSQL存储过程以及如何调用..

DELIMITER $$

DROP PROCEDURE IF EXISTS `sp_user_login` $$
CREATE DEFINER=`root`@`%` PROCEDURE `sp_user_login`(
  IN loc_username VARCHAR(255),
  IN loc_password VARCHAR(255)
)
BEGIN

  SELECT user_id,
         user_name,
         user_emailid,
         user_profileimage,
         last_update
    FROM tbl_user
   WHERE user_name = loc_username
     AND password = loc_password
     AND status = 1;

END $$

DELIMITER ;

并通过mysql_connection规范和

调用

$loginCheck="call sp_user_login('".$username."','".$password."');";

它将返回程序的结果。

Answer 3

我创建了一个简单的MySQL过程，如下所示：

DELIMITER //
CREATE PROCEDURE GetAllListings()
 BEGIN
 SELECT nid, type, title  FROM node where type = 'lms_listing' order by nid desc;
END //
DELIMITER;

请遵循此步骤。创建过程之后，您可以看到相同的过程并执行它。

Answer 4

我的SQL存储过程创建

import wx

class Main1(wx.Frame):
    def __init__(self, parent):
        wx.Frame.__init__(self, parent=parent)
        self.bSizer1 = wx.BoxSizer(wx.VERTICAL)
        self.Btn1 = wx.Button(self, wx.ID_ANY, "Btn1", wx.DefaultPosition, wx.DefaultSize, 0)
        self.bSizer1.Add(self.Btn1, 1, wx.ALL|wx.EXPAND, 5)
        self.SetSizer(self.bSizer1)
        self.Btn1.Bind(wx.EVT_BUTTON, self.btn1_f)


    def btn1_f(self, event):
        print("here 1")
        self.x = 12
        self.y = 30

        a = Other_a([self.x, self.y])
        a.Show()
        b = Other_b(self.x)
        b.Show()


class Other_a(wx.Frame):
    def __init__(self, foo):
        self.foo = foo
        wx.Frame.__init__(self, None)
        self.bSizer2 = wx.BoxSizer(wx.VERTICAL)
        self.Btn2 = wx.Button(self, wx.ID_ANY, "Btn 2a", wx.DefaultPosition, wx.DefaultSize, 0)
        self.bSizer2.Add(self.Btn2, 0, wx.ALL|wx.EXPAND, 5)
        self.SetSizer(self.bSizer2)
        self.Btn2.Bind(wx.EVT_BUTTON, self.btn2_f)

        print("here 2")
        print(self.foo[0])

    def btn2_f(self, event):
        print("here 3")
        print(self.foo[1])

class Other_b(wx.Frame):
    def __init__(self, x):
        self.x = x
        wx.Frame.__init__(self, None)
        self.bSizer3 = wx.BoxSizer(wx.VERTICAL)
        self.Btn3 = wx.Button(self, wx.ID_ANY, "Btn 2b", wx.DefaultPosition, wx.DefaultSize, 0)
        self.bSizer3.Add(self.Btn3, 0, wx.ALL|wx.EXPAND, 5)
        self.SetSizer(self.bSizer3)
        self.Btn3.Bind(wx.EVT_BUTTON, self.btn3_f)
        print("here 4")

    def btn3_f(self, event):
        print("here 5")
        print(self.x)


if __name__ == "__main__":
    app = wx.App(False)
    frame = Main1(None)
    frame.Show(True)
    app.MainLoop()

Answer 5

在mysql中创建过程语法： -

DELIMITER //

CREATE  PROCEDURE `user_rank`(IN group_id int)

 BEGIN
    SET @total_like:=0, @rank:=0,@rnk :=0;
    select * from (select IF(@total_like = total_like, @rank:=@rank, @rank:=@rank + 1) rank, @rnk:=@rnk + 1 as rank_offset, @total_like:=total_like as total_likes, user_id, user_name, thumb from (SELECT like_count as total_like, like_counts.user_id,  user_name, thumb from like_counts inner join class_grades ON (class_grades.user_id = like_counts.user_id) inner join class_groups ON (class_groups.class_id = user_grades.grade_id and class_groups.class_group_id = group_id ) where role_id = '8' and like_counts.status = '1' and country_code ='+91' group by like_counts.user_id order by total_like desc LIMIT 10 OFFSET 0) r) t, (SELECT @total_like:=0, @rank:=0, @rnk:=0) s;

  END //
 DELIMITER ;

MySQL使用分隔符创建存储过程语法

5 个答案:

MySQL中的存储过程语法入门：

我的SQL存储过程创建