python3 之pymysql 连接mysql数据库

pymsql是Python中操作MySQL的模块并且只有在Python3.0版本中才存在，其使用方法和MySQLdb几乎相同。

下载安装pymsql模块

pip3 install pymysql

操作前准备

#1.创建数据库
mysql> create database mydb;
mysql> use mydb;

#2.创建表
create table students
    (
        id int  not null auto_increment primary key,
        name char(8) not null,
        sex char(4) not null,
        age tinyint unsigned not null,
        tel char(13) null default "-"
    );

#3.插入两条数据
mysql> insert  into students values(1,"jack","M",20,"stu");
mysql> insert  into students values(2,"xander","M",20,"stu");

1.执行SQL

import pymysql

# 创建mysql连接（socket），client --> server
"""
host = "Server端IP"
port = "Server端口"
user = "Server端用户"
passwd = "Server端密码"
db = "Server端数据库名"
"""
conn = pymysql.connect(host="10.0.0.51",port=3306,user="root",passwd="123456",db="mydb")

#创建游标(光标位置)，相当于是socket上的实例
cursor = conn.cursor()

# 执行SQL语句，并返回受影响的行数
"""
cursor.execute("需要执行的sql语句")
"""
effect_row = cursor.execute("select * from students")
print(cursor.fetchone())    # 获取第一条数据
print(cursor.fetchone())    # 获取第二条数据
print("------")
print(cursor.fetchall())    # 获取所有数据(从未被获取的数据中读出来)

# 提交SQL语句执行结果，不然无法保存新建或者修改的数据
conn.commit()

# 关闭游标
cursor.close()

# 关闭MySQL连接
conn.close()

2.插入数据

import pymysql

# 创建mysql连接（socket），client --> server
conn = pymysql.connect(host="10.0.0.51",port=3306,user="root",passwd="123456",db="mydb")

#创建游标(光标位置)，相当于是socket上的实例
cursor = conn.cursor()

# 定义需要插入的数据
data = [
    ("Daniel","M","21","stu"),
    ("Noah","M","25","stu"),
    ("David", "M", "25", "stu")
]

# 执行插入SQL语句
cursor.executemany("insert into students(name,sex,age,tel) values(%s,%s,%s,%s)" ,data)

# 提交SQL语句执行结果，不然无法保存新建或者修改的数据
conn.commit()

# 关闭游标
cursor.close()

# 关闭MySQL连接
conn.close()