Question

我需要帮助了解以下情况。我想调用存储的mysql过程并将输出存储在变量中，然后访问内容以检查是否存在某些文本。我是python的新手，很难理解我应该怎么做。我绝对需要调用该过程，而不是执行mysql查询show slave status;。但基本上该函数执行该查询。

Python 3.3.2+ (default, Feb 28 2014, 00:52:16) 
[GCC 4.8.1] on linux
Type "help", "copyright", "credits" or "license" for more information.
>>> import mysql.connector
>>> conn = mysql.connector.connect(host = "xxxx", port = xxxx, user = "xxxx", password = "xxxx", database = "xxxx")
>>> cursor = conn.cursor()
>>> cursor.callproc('show_slave_status')
()
>>> for result in cursor.stored_results():
...     print(result.fetchall())
... 
[]

如果我尝试运行查询而不是使用cursor.callproc，则会出现以下错误：

>>> cursor.execute("call show_slave_status")
Traceback (most recent call last):
  File "/usr/local/lib/python3.3/dist-packages/mysql/connector/cursor.py", line 508, in execute
    self._handle_result(self._connection.cmd_query(stmt))
  File "/usr/local/lib/python3.3/dist-packages/mysql/connector/connection.py", line 640, in cmd_query
    'Use cmd_query_iter for statements with multiple queries.')
mysql.connector.errors.InterfaceError: Use cmd_query_iter for statements with multiple queries.

During handling of the above exception, another exception occurred:

Traceback (most recent call last):
  File "<stdin>", line 1, in <module>
  File "/usr/local/lib/python3.3/dist-packages/mysql/connector/cursor.py", line 512, in execute
    "Use multi=True when executing multiple statements")
mysql.connector.errors.InterfaceError: Use multi=True when executing multiple statements

如果我设置multi=True，它就不会变得更好。

这里的函数输出是我在mysql控制台中运行查询

mysql> call show_slave_status;
+----------------------------------+-------------+-------------+-------------+---------------+------------------+---------------------+------------------+---------------+-----------------------+------------------+-------------------+-----------------+---------------------+--------------------+------------------------+-------------------------+-----------------------------+------------+------------+--------------+---------------------+-----------------+-----------------+----------------+---------------+--------------------+--------------------+--------------------+-----------------+-------------------+----------------+-----------------------+-------------------------------+---------------+---------------+----------------+----------------+-----------------------------+------------------+
| Slave_IO_State                   | Master_Host | Master_User | Master_Port | Connect_Retry | Master_Log_File  | Read_Master_Log_Pos | Relay_Log_File   | Relay_Log_Pos | Relay_Master_Log_File | Slave_IO_Running | Slave_SQL_Running | Replicate_Do_DB | Replicate_Ignore_DB | Replicate_Do_Table | Replicate_Ignore_Table | Replicate_Wild_Do_Table | Replicate_Wild_Ignore_Table | Last_Errno | Last_Error | Skip_Counter | Exec_Master_Log_Pos | Relay_Log_Space | Until_Condition | Until_Log_File | Until_Log_Pos | Master_SSL_Allowed | Master_SSL_CA_File | Master_SSL_CA_Path | Master_SSL_Cert | Master_SSL_Cipher | Master_SSL_Key | Seconds_Behind_Master | Master_SSL_Verify_Server_Cert | Last_IO_Errno | Last_IO_Error | Last_SQL_Errno | Last_SQL_Error | Replicate_Ignore_Server_Ids | Master_Server_Id |
+----------------------------------+-------------+-------------+-------------+---------------+------------------+---------------------+------------------+---------------+-----------------------+------------------+-------------------+-----------------+---------------------+--------------------+------------------------+-------------------------+-----------------------------+------------+------------+--------------+---------------------+-----------------+-----------------+----------------+---------------+--------------------+--------------------+--------------------+-----------------+-------------------+----------------+-----------------------+-------------------------------+---------------+---------------+----------------+----------------+-----------------------------+------------------+
| Waiting for master to send event | localhost   | xxxx        |        xxxx |            60 | mysql-bin.000025 |             5782876 | relay-bin.000075 |       5782979 | mysql-bin.000025      | Yes              | Yes               |                 |                     |                    |                        |                         | xxxx%.%\_NUM\_MEM          |          0 |            |            0 |             5782876 |         5783275 | None            |                |             0 | No                 |                    |                    |                 |                   |                |                     0 | No                            |             0 |               |              0 |                |                             |             xxxx |
+----------------------------------+-------------+-------------+-------------+---------------+------------------+---------------------+------------------+---------------+-----------------------+------------------+-------------------+-----------------+---------------------+--------------------+------------------------+-------------------------+-----------------------------+------------+------------+--------------+---------------------+-----------------+-----------------+----------------+---------------+--------------------+--------------------+--------------------+-----------------+-------------------+----------------+-----------------------+-------------------------------+---------------+---------------+----------------+----------------+-----------------------------+------------------+
1 row in set (0.10 sec)

这是程序定义

mysql>  SHOW CREATE PROCEDURE show_slave_status\G
*************************** 1. row ***************************
           Procedure: show_slave_status
            sql_mode: 
    Create Procedure: CREATE DEFINER=`xxxx`@`localhost` PROCEDURE `show_slave_status`()
BEGIN show slave status; END
character_set_client: latin1
collation_connection: latin1_swedish_ci
  Database Collation: latin1_swedish_ci
1 row in set (0.27 sec)

Answer 1

您正在使用stored_results()方法正确执行此操作。没有必要（或明智地）使用多个语句。虽然我们支持它，但最好一个一个地做。

看到结果为空，看起来您正在连接到主服务器或没有从服务器状态的MySQL。

I have blogged about getting results after calling a procedure.我们可能需要更好地记录这一点。

Python 3.X访问cursor.callproc的结果

1 个答案: