围绕连接MySQL数据库表的问题

时间：2018-01-19 06:12:23

标签： python

我有一些代码试图连接到mySQL数据库并检索查询。

连接代码位于名为connection的模块中，如下所示：

#!/usr/bin/env python3
import pandas as pd
import pymysql
from sqlalchemy import create_engine

COMPANY_SERVER = create_engine(
    'mysql+pymysql://view_user:connectiondetails')

def read_sql(query):
    return pd.read_sql_query(query, COMPANY_SERVER)

我省略了安全性的连接细节。但这种联系在过去一直有效。

我正在尝试连接和查询数据库表（使用变量名table拉入）并尝试以下列方式返回表的DESCRIBE：

#!/usr/bin/env python3
import datetime as dt
import numpy as np
import pandas as pd
from copy import copy
import pymysql
from sql.connection import read_sql  


class DBSnapData(object):
    def __init__(self,
                 start_dt,
                 end_dt,
                 start_point,
                 end_point,
                 variables,
                 table,
                 stock_id  
                 ):
        self.start_dt = start_dt
        self.end_dt = end_dt
        self.start_point = start_point
        self.end_point = end_point
        self.variables = variables
        self.table = table
        self.stock_id = stock_id  
        self.schema = self.load_schema()

    def load_schema(self):
        return run_schema_sql_query(self.table)

    def run_schema_sql_query(table):
        return read_sql('DESCRIBE %s' % table)

我收到以下错误输出：

2018-01-17 22:34:02,717 (pymysql.err.OperationalError) (1142, "SELECT command denied to user 'view_user'@'192.168.9.132' for table 'TBL_MKTDATA_SNAPS_AUS'") [SQL: 'DESCRIBE TBL_MKTDATA_SNAPS_AUS']
Traceback (most recent call last):
  File "/usr/local/lib64/python3.5/site-packages/sqlalchemy/engine/base.py", line 1182, in _execute_context
    context)
  File "/usr/local/lib64/python3.5/site-packages/sqlalchemy/engine/default.py", line 470, in do_execute
    cursor.execute(statement, parameters)
  File "/usr/local/lib/python3.5/site-packages/pymysql/cursors.py", line 166, in execute
    result = self._query(query)
  File "/usr/local/lib/python3.5/site-packages/pymysql/cursors.py", line 322, in _query
    conn.query(q)
  File "/usr/local/lib/python3.5/site-packages/pymysql/connections.py", line 856, in query
    self._affected_rows = self._read_query_result(unbuffered=unbuffered)
  File "/usr/local/lib/python3.5/site-packages/pymysql/connections.py", line 1057, in _read_query_result
    result.read()
  File "/usr/local/lib/python3.5/site-packages/pymysql/connections.py", line 1340, in read
    first_packet = self.connection._read_packet()
  File "/usr/local/lib/python3.5/site-packages/pymysql/connections.py", line 1014, in _read_packet
    packet.check_error()
  File "/usr/local/lib/python3.5/site-packages/pymysql/connections.py", line 393, in check_error
    err.raise_mysql_exception(self._data)
  File "/usr/local/lib/python3.5/site-packages/pymysql/err.py", line 107, in raise_mysql_exception
    raise errorclass(errno, errval)
pymysql.err.OperationalError: (1142, "SELECT command denied to user 'view_user'@'192.168.9.132' for table 'TBL_MKTDATA_SNAPS_AUS'")

The above exception was the direct cause of the following exception:

Traceback (most recent call last):
  File "/home/scoleman/bin/export_mkt_data", line 405, in main
    extract_by_id(sc_id, bbg_ticker, bb_id, lot_size_changes)
  File "/home/scoleman/bin/export_mkt_data", line 346, in extract_by_id
    stock_id)
  File "/home/scoleman/git/sql_data/sx_data_adhoc.py", line 100, in __init__
    self.schema = self.load_schema()
  File "/home/scoleman/git/sql_data/sx_data_adhoc.py", line 106, in load_schema
    return run_schema_sql_query(self.table)
  File "/home/scoleman/git/sql_data/sx_data_adhoc.py", line 19, in run_schema_sql_query
    return read_sql('DESCRIBE %s' % table)  
  File "/home/scoleman/git/sql_data/sql/connection.py", line 17, in read_sql
    return pd.read_sql_query(query, COMPANY_SERVER)
  File "/usr/local/lib64/python3.5/site-packages/pandas/io/sql.py", line 331, in read_sql_query
    parse_dates=parse_dates, chunksize=chunksize)
  File "/usr/local/lib64/python3.5/site-packages/pandas/io/sql.py", line 1084, in read_query
    result = self.execute(*args)
  File "/usr/local/lib64/python3.5/site-packages/pandas/io/sql.py", line 975, in execute
    return self.connectable.execute(*args, **kwargs)
  File "/usr/local/lib64/python3.5/site-packages/sqlalchemy/engine/base.py", line 2064, in execute
    return connection.execute(statement, *multiparams, **params)
  File "/usr/local/lib64/python3.5/site-packages/sqlalchemy/engine/base.py", line 939, in execute
    return self._execute_text(object, multiparams, params)
  File "/usr/local/lib64/python3.5/site-packages/sqlalchemy/engine/base.py", line 1097, in _execute_text
    statement, parameters
  File "/usr/local/lib64/python3.5/site-packages/sqlalchemy/engine/base.py", line 1189, in _execute_context
    context)
  File "/usr/local/lib64/python3.5/site-packages/sqlalchemy/engine/base.py", line 1402, in _handle_dbapi_exception
    exc_info
  File "/usr/local/lib64/python3.5/site-packages/sqlalchemy/util/compat.py", line 203, in raise_from_cause
    reraise(type(exception), exception, tb=exc_tb, cause=cause)
  File "/usr/local/lib64/python3.5/site-packages/sqlalchemy/util/compat.py", line 186, in reraise
    raise value.with_traceback(tb)
  File "/usr/local/lib64/python3.5/site-packages/sqlalchemy/engine/base.py", line 1182, in _execute_context
    context)
  File "/usr/local/lib64/python3.5/site-packages/sqlalchemy/engine/default.py", line 470, in do_execute
    cursor.execute(statement, parameters)
  File "/usr/local/lib/python3.5/site-packages/pymysql/cursors.py", line 166, in execute
    result = self._query(query)
  File "/usr/local/lib/python3.5/site-packages/pymysql/cursors.py", line 322, in _query
    conn.query(q)
  File "/usr/local/lib/python3.5/site-packages/pymysql/connections.py", line 856, in query
    self._affected_rows = self._read_query_result(unbuffered=unbuffered)
  File "/usr/local/lib/python3.5/site-packages/pymysql/connections.py", line 1057, in _read_query_result
    result.read()
  File "/usr/local/lib/python3.5/site-packages/pymysql/connections.py", line 1340, in read
    first_packet = self.connection._read_packet()
  File "/usr/local/lib/python3.5/site-packages/pymysql/connections.py", line 1014, in _read_packet
    packet.check_error()
  File "/usr/local/lib/python3.5/site-packages/pymysql/connections.py", line 393, in check_error
    err.raise_mysql_exception(self._data)
  File "/usr/local/lib/python3.5/sit

如果有人能给我一个关于解决方案的指针，我将不胜感激。我认为问题可能出在pymysql连接中，但实际上我不确定。

由于

1 个答案:

答案 0 :(得分：0)

您的错误显示view_user无权查询192.168.9.132此服务器上的数据。

你必须这样做 GRANT SELECT ON *.* TO 'view_user'@'host_or_wildcard' IDENTIFIED BY 'password';允许您的user在指定的服务器上进行查询。

或

GRANT ALL PRIVILEGES ON *.* TO 'view_user'@'192.168.9.132';授予所有特权。

P.S。要做到以上，您必须是root用户。使用mysql -u root -p命令连接到mysql服务器。

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