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Analysis of common operations of MySQL under cmd and python

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Release： 2018-01-17 09:49:07

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This article mainly brings you a brief discussion of the common operations of MySQL under cmd and python. The editor thinks it’s pretty good, so I’ll share it with you now and give it as a reference. Let’s follow the editor to take a look, I hope it can help everyone.

Environment configuration 1: Install mysql, add the bin directory of mysql to the environment variable

Environment configuration 2: python install MySQL-Python

Please download and install according to your own operating system, otherwise C++ compile 9.0, import _mysql and other errors will be reported

windows10 64-bit operating system can go to http://www.lfd.uci.edu/~gohlke/pythonlibs/ to download and install the MySQL-Python package. As for For the installation method of whl and tar.gz under Windows and Linux, please see my previous article

1. Operation under cmd command:

Connect to mysql: mysql -u root -p

View all databases: show databases;

Create test database: create database test;

Delete database: drop database test;

Use (switch to )test database: use test;

View the tables under the current database: show tables;

Create UserInfo table: create table UserInfo(id int(5) NOT NULL auto_increment,username varchar(10) ),password varchar(20) NOT NULL,PRIMARY KEY(id));

Delete table: drop table UserInfo;

Judge whether the data exists: select * from UserInfo where name like 'elijahxb ';

Increase data: insert into UserInfo(username,password) value('eljiahxb','123456');

Check data: select * from UserInfo; select id from UserInfo; select username from UserInfo;

Change data: update UserInfo set username = 'Zus' where id=1; update UserInfo set username='Zus';

Delete data: delete from UserInfo; delete from UserInfo where id=1;

Disconnect: quit

2. Operation under python:

# -*- coding: utf-8 -*-
#!/usr/bin/env python

# @Time  : 2017/6/4 18:11
# @Author : Elijah
# @Site  : 
# @File  : sql_helper.py
# @Software: PyCharm Community Edition
import MySQLdb

class MySqlHelper(object):
  def __init__(self,**args):
    self.ip = args.get("IP")
    self.user = args.get("User")
    self.password = args.get("Password")
    self.tablename = args.get("Table")
    self.port = 3306
    self.conn = self.conn = MySQLdb.Connect(host=self.ip,user=self.user,passwd=self.password,port=self.port,connect_timeout=5,autocommit=True)
    self.cursor = self.conn.cursor()

  def Close(self):
    self.cursor.close()
    self.conn.close()
  def execute(self,sqlcmd):
    return self.cursor.execute(sqlcmd)
  def SetDatabase(self,database):
    return self.cursor.execute("use %s;"%database)
  def GetDatabasesCount(self):
    return self.cursor.execute("show databases;")
  def GetTablesCount(self):
    return self.cursor.execute("show tables;")
  def GetFetchone(self, table = None):
    if not table:
      table = self.tablename
    self.cursor.execute("select * from %s;"%table)
    return self.cursor.fetchone()
  def GetFetchmany(self,table=None,size=0):
    if not table:
      table = self.tablename
    count = self.cursor.execute("select * from %s;"%table)
    return self.cursor.fetchmany(size)
  def GetFetchall(self,table=None):
    '''
    :param table: 列表
    :return:
    '''
    if not table:
      table = self.tablename
    self.cursor.execute("select * from %s;"%table)
    return self.cursor.fetchall()
  def SetInsertdata(self,table=None,keyinfo=None,value=None):
    """
    :param table:
    :param keyinfo:可以不传此参数，但此时value每一条数据的字段数必须与数据库中的字段数一致。
            传此参数时，则表示只穿指定字段的字段值。
    :param value:类型必须为只有一组信息的元组，或者包含多条信息的元组组成的列表
    :return:
    """
    if not table:
      table = self.tablename
    slist = []
    if type(value)==tuple:
      valuelen = value
      execmany = False
    else:
      valuelen = value[0]
      execmany = True
    for each in range(len(valuelen)):
      slist.append("%s")
    valuecenter = ",".join(slist)
    if not keyinfo:
      sqlcmd = "insert into %s values(%s);"%(table,valuecenter)
    else:
      sqlcmd = "insert into %s%s values(%s);" % (table,keyinfo,valuecenter)
    print(sqlcmd)
    print(value)
    if execmany:
      return self.cursor.executemany(sqlcmd,value)
    else:
      return self.cursor.execute(sqlcmd, value)

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