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How to connect python to mysql

爱喝马黛茶的安东尼

Release： 2019-06-25 15:28:10

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How to connect python to mysql? Here is a detailed introduction to how to use MySQLdb:

(1) What is MySQLdb?

MySQLdb is an interface for Python to connect to the MySQL database. It implements the Python database API specification V2.0 and is based on the MySQL C API.

(2) Install MySQLdb from source code: https://pypi.python.org/pypi/MySQL-python

$ tar zxvf MySQL-python-*.tar.gz
$ cd MySQL-python-*
$ python setup.py build
$ python setup.py install

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(3) Use of MySQLdb:

#!/usr/bin/env python
# coding=utf-8
import MySQLdb
def connectdb():
    print(&#39;连接到mysql服务器...&#39;)
    # 打开数据库连接
    # 用户名:hp, 密码:Hp12345.,用户名和密码需要改成你自己的mysql用户名和密码，并且要创建数据库TESTDB，
    并在TESTDB数据库中创建好表Student
    db = MySQLdb.connect("localhost","hp","Hp12345.","TESTDB")
    print(&#39;连接上了!&#39;)
    return db
def createtable(db):
    # 使用cursor()方法获取操作游标 
    cursor = db.cursor()
    # 如果存在表Sutdent先删除
    cursor.execute("DROP TABLE IF EXISTS Student")
    sql = """CREATE TABLE Student (
            ID CHAR(10) NOT NULL,
            Name CHAR(8),
            Grade INT )"""
    # 创建Sutdent表
    cursor.execute(sql)
def insertdb(db):
    # 使用cursor()方法获取操作游标 
    cursor = db.cursor()
    # SQL 插入语句
    sql = """INSERT INTO Student
         VALUES (&#39;001&#39;, &#39;CZQ&#39;, 70),
                (&#39;002&#39;, &#39;LHQ&#39;, 80),
                (&#39;003&#39;, &#39;MQ&#39;, 90),
                (&#39;004&#39;, &#39;WH&#39;, 80),
                (&#39;005&#39;, &#39;HP&#39;, 70),
                (&#39;006&#39;, &#39;YF&#39;, 66),
                (&#39;007&#39;, &#39;TEST&#39;, 100)"""
    #sql = "INSERT INTO Student(ID, Name, Grade) \
    #    VALUES (&#39;%s&#39;, &#39;%s&#39;, &#39;%d&#39;)" % \
    #    (&#39;001&#39;, &#39;HP&#39;, 60)
    try:
        # 执行sql语句
        cursor.execute(sql)
        # 提交到数据库执行
        db.commit()
    except:
        # Rollback in case there is any error
        print &#39;插入数据失败!&#39;
        db.rollback()
def querydb(db):
    # 使用cursor()方法获取操作游标 
    cursor = db.cursor()
    # SQL 查询语句
    #sql = "SELECT * FROM Student \
    #    WHERE Grade > &#39;%d&#39;" % (80)
    sql = "SELECT * FROM Student"
    try:
        # 执行SQL语句
        cursor.execute(sql)
        # 获取所有记录列表
        results = cursor.fetchall()
        for row in results:
            ID = row[0]
            Name = row[1]
            Grade = row[2]
            # 打印结果
            print "ID: %s, Name: %s, Grade: %d" % \
                (ID, Name, Grade)
    except:
        print "Error: unable to fecth data"
def deletedb(db):
    # 使用cursor()方法获取操作游标 
    cursor = db.cursor()
    # SQL 删除语句
    sql = "DELETE FROM Student WHERE Grade = &#39;%d&#39;" % (100)
    try:
       # 执行SQL语句
       cursor.execute(sql)
       # 提交修改
       db.commit()
    except:
        print &#39;删除数据失败!&#39;
        # 发生错误时回滚
        db.rollback()
def updatedb(db):
    # 使用cursor()方法获取操作游标 
    cursor = db.cursor()
    # SQL 更新语句
    sql = "UPDATE Student SET Grade = Grade + 3 WHERE ID = &#39;%s&#39;" % (&#39;003&#39;)
    try:
        # 执行SQL语句
        cursor.execute(sql)
        # 提交到数据库执行
        db.commit()
    except:
        print &#39;更新数据失败!&#39;
        # 发生错误时回滚
        db.rollback()
def closedb(db):
    db.close()
def main():
    db = connectdb()    # 连接MySQL数据库
    createtable(db)     # 创建表
    insertdb(db)        # 插入数据
    print &#39;\n插入数据后:&#39;
    querydb(db) 
    deletedb(db)        # 删除数据
    print &#39;\n删除数据后:&#39;
    querydb(db)
    updatedb(db)        # 更新数据
    print &#39;\n更新数据后:&#39;
    querydb(db)
    closedb(db)         # 关闭数据库
if __name__ == &#39;__main__&#39;:
    main()

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