人工智能之Python18 用python3连接mysql数据库

任何一种编程语言都有数据库交互能力，python也不例外。

Python3 使用 PyMySQL 连接数据库，并实现简单的增删改查。

关于PyMysql

PyMySQL 是在 Python3.x 版本中用于连接 MySQL 服务器的一个库，Python2中则使用mysqldb。

安装PyMysql

PyMysql的安装有多种方式，我这里用的ide时pycharm，解释器是anacanda，所以直接界面点击安装

如下图：

连接数据库并建表

新建create_table.py

import pymysql

db_connect = pymysql.connect("192.168.216.129","root","root@mariadb","ai")
cursor = db_connect.cursor()
cursor.execute("DROP TABLE IF EXISTS t_ai_test")

print(cursor.rowcount)

sql_create_table = """CREATE TABLE t_ai_test (
         FIRST_NAME  CHAR(20) NOT NULL,
         LAST_NAME  CHAR(20),
         AGE INT,  
         SEX CHAR(1),
         INCOME FLOAT )"""

cursor.execute(sql_create_table)
db_connect.commit()
print(cursor.rowcount)

cursor.close()
db_connect.close()

# 执行完之后发现数据库多了一张表

插入一条数据

insert.py

import pymysql

db_connect = pymysql.connect("192.168.216.129","root","root@mariadb","ai")
cursor = db_connect.cursor()

sql_insert_table = """insert into t_ai_test
                (FIRST_NAME,LAST_NAME,AGE,SEX,INCOME) 
         values ('he','shiyuan',18,'1',20000)"""
try:
    cursor.execute(sql_insert_table)
    db_connect.commit()
    print(cursor.rowcount)
except Exception as e:
    db_connect.rollback()
    print("insert sql捕获到异常")
    raise e

cursor.close()
db_connect.close()

# 查询数据库发现数据已经插入成功

修改

update.py

import pymysql

db_connect = pymysql.connect("192.168.216.129","root","root@mariadb","ai")
cursor = db_connect.cursor()

sql_insert_table = """update t_ai_test
                set INCOME = 30000 where FIRST_NAME = 'he' and LAST_NAME = 'shiyuan'"""
try:
    cursor.execute(sql_insert_table)
    db_connect.commit()
    print(cursor.rowcount)
except Exception as e:
    db_connect.rollback()
    print("insert sql捕获到异常")
    raise e

cursor.close()
db_connect.close()

查询

select.py

import pymysql

db_connect = pymysql.connect("192.168.216.129","root","root@mariadb","ai")
cursor = db_connect.cursor()

sql_select_table = """select * from t_ai_test where FIRST_NAME = 'he' and LAST_NAME = 'shiyuan'"""
try:
    cursor.execute(sql_select_table)
    data = cursor.fetchall()
    db_connect.commit()
    if(len(data) > 0):
        print(data)
    else:
        print("no data")
except Exception as e:
    db_connect.rollback()
    print("insert sql捕获到异常")
    raise e

cursor.close()
db_connect.close()

删除

delete.py

import pymysql

db_connect = pymysql.connect("192.168.216.129","root","root@mariadb","ai")
cursor = db_connect.cursor()

sql_delete_table = """delete from t_ai_test where FIRST_NAME = 'he' and LAST_NAME = 'shiyuan'"""
try:
    cursor.execute(sql_delete_table)
    data = cursor.fetchall()
    db_connect.commit()
    print(cursor.rowcount)
except Exception as e:
    db_connect.rollback()
    print("delete sql捕获到异常")
    raise e

cursor.close()
db_connect.close()

总结

以上便是python3操作mysql数据库的增删改查操作。后续完善更新

源码

python整合mysql