1.没有安装PyMysql,进行安装
pip3 install PyMysql
2.连接数据库
#! /usr/bin/python
# -*-coding:UTF-8-*-
import pymysql
def db_connect():
try:
# 打开数据库连接
db = pymysql.connect("localhost", "root", "123456", "test")
print('Database connection success')
# 关闭数据库连接
db.close()
except Exception as e:
print("Database connection failure.error：%s"% e)
def main():
db_connect()
if __name__ == "__main__":
main()
3.创建表
#! /usr/bin/python
# -*-coding:UTF-8-*-
import pymysql
def create_table():
# 打开数据库连接
db = pymysql.connect(host="localhost", port=3306, user="root", passwd="123456", db="test", charset='utf8')
# 使用cursor()方法创建一个游标对象cursor
cursor = db.cursor()
# 使用execute()方法执行SQL查询
cursor.execute("DROP TABLE IF EXISTS member")
# 使用预处理语句创建表
sql = """CREATE TABLE member(
`id` int(11) unsigned NOT NULL AUTO_INCREMENT COMMENT 'id',
`nickname` char(20) NOT NULL COMMENT '昵称',
`realname` char(20) NOT NULL COMMENT '真实姓名',
`birth` datetime DEFAULT NULL COMMENT '出生年月日',
`hobby` varchar(255) NOT NULL COMMENT '爱好',
`create_time` timestamp NOT NULL DEFAULT CURRENT_TIMESTAMP COMMENT '创建时间',
`edit_time` datetime DEFAULT NULL COMMENT '编辑时间',
PRIMARY KEY(`id`),
KEY `nickname` (`nickname`),
KEY `realname` (`realname`)) ENGINE=InnoDB AUTO_INCREMENT=1 DEFAULT CHARSET=utf8 COMMENT='会员表'"""
try:
cursor.execute(sql)
print("CREATE TABLE SUCCESS.")
except Exception as e:
print("CREATE TABLE FAILED,CASE:%S",e)
finally:
# 关闭数据库
db.close()
def main():
create_table()
4.批量插入数据
#! /usr/bin/python
# -*-coding:UTF-8-*-
import pymysql
def insert():
# 打开数据库连接
db = pymysql.connect(host="localhost", port=3306, user="root", passwd="123456", db="test", charset='utf8')
# 使用cursor()方法创建一个游标对象cursor
cursor = db.cursor()
data = [
['二哥', '王力宏', '1992-01-01 08:00:00','吉他'],
['春哥', '陈小春', '1990-01-01 08:00:00', '古惑仔'],
['颖宝' ,'赵丽颖', '1995-01-01 08:00:00', '武侠剧']
]
# SQL 插入语句
sql = """INSERT INTO member(`nickname`,`realname`, `birth`, `hobby`) VALUES(%s, %s, %s, %s)"""
try:
# 批量插入数据，比循环插入快
cursor.executemany(sql,data)
# 数据提交
db.commit()
print("INSERT DATA SUCCESS.")
except Exception as e:
print("INSERT DATA FAILED,CASE:%S",e)
# 数据回滚
db.rollback()
finally:
# 关闭数据库
db.close()
def main():
insert()
if __name__ == "__main__":
main()
5.数据查询
#! /usr/bin/python
# -*-coding:UTF-8-*-
import pymysql
def select():
# 打开数据库连接
db = pymysql.connect(host="localhost", port=3306, user="root", passwd="123456", db="test", charset='utf8')
# 使用cursor()方法创建一个游标对象cursor
cursor = db.cursor()
# SQL 查询语句
sql = """SELECT * FROM member WHERE birth > %s"""
try:
# 执行SQL语句
cursor.execute(sql,('1990-01-01 08:00:00'))
# 获取所有记录列表
results = cursor.fetchall()
print( results )
return
for index, value in enumerate(results):
print("昵称：%s 真实姓名：%s 生日：%s \r\n" % ( value[1], value[2], value[3] ))
except Exception as e:
print("SELECT DATA FAILED,ERROR:%S",e)
finally:
# 关闭数据库
db.close()
def main():
select()
if __name__ == "__main__":
main()
6.数据更改
#! /usr/bin/python
# -*-coding:UTF-8-*-
import pymysql
import datetime
def update():
# 打开数据库连接
db = pymysql.connect(host="localhost", port=3306, user="root", passwd="123456", db="test", charset='utf8')
# 使用cursor()方法创建一个游标对象cursor
cursor = db.cursor()
# SQL 查询语句
sql = """UPDATE member SET realname = %s , edit_time = %s WHERE id = %s"""
try:
# 执行SQL语句
result = cursor.execute(sql,("王小宏", datetime.datetime.now(), 1))
if result == 1:
# 数据提交
db.commit()
print("UPDATE DATA SUCCESS")
else:
# 抛出异常
raise NameError('ValueError')
except Exception as e:
# 数据回滚
db.rollback()
print("UPDATE DATA FAILED,ERROR:%S",e)
finally:
# 关闭数据库
db.close()
def main():
update()
if __name__ == "__main__":
main()
7.删除数据
#! /usr/bin/python
# -*-coding:UTF-8-*-
import pymysql
import datetime
def update():
# 打开数据库连接
db = pymysql.connect(host="localhost", port=3306, user="root", passwd="123456", db="test", charset='utf8')
# 使用cursor()方法创建一个游标对象cursor
cursor = db.cursor()
# SQL 查询语句
sql = """DELETE FROM member WHERE id = %s"""
try:
# 执行SQL语句
result = cursor.execute(sql,(1))
if result == 1:
# 数据提交
db.commit()
print("DELETE DATA SUCCESS")
else:
# 抛出异常
raise NameError('ValueError')
except Exception as e:
# 数据回滚
db.rollback()
print("DELETE DATA FAILED,ERROR:%S",e)
finally:
# 关闭数据库
db.close()
def main():
update()
if __name__ == "__main__":
main()
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