Python中pymysql基本使用

 

Python中pymysql模塊經過獲取mysql數據庫命令行遊標執行數據庫命令來進行數據庫操做

　　優勢：操做數據庫語句所見即所得，執行了什麼數據庫語句都很清楚

　　缺點：操做繁瑣，代碼量多

 

 

1. pymysql的基本使用

# -*- coding:utf-8 -*-
# Author:Wong Du

import pymysql

# 建立連接，至關於創建一個socket
conn = pymysql.Connection(host='10.0.0.100', port=3306, user='root', passwd='123456', db='testdb')

# 創建遊標，至關於進入 mysql> 命令操做界面
cursor = conn.cursor()

# 建表，和mysql命令行操做同樣
try:
    create_table = cursor.execute('''create table student(
                                  id int not null primary key auto_increment,
                                  name char(32) not null,
                                  register_date date not null DEFAULT "2018-05-09" );
                                  ''')
except pymysql.err.InternalError as e:
    # print(type(e))
    print("\033[31;1m%s; Do nothing...\033[0m" %e)

# 插入數據
insert = cursor.execute('insert into student (name,register_date) values("junry", "2017-03-14");')
insert2 = cursor.execute('insert into student (name,register_date) values("hongfa", "2015-03-14");')
insert3 = cursor.execute('insert into student (name,register_date) values("jinglin", "2016-03-14");')

# 查看錶數據
select = cursor.execute('select * from student;')
for line in cursor.fetchall():
    print(line)

# 修改表數據
update = cursor.execute('update student set name="junwei" where id=1')
select2 = cursor.execute('select * from student;')
print(cursor.fetchone())

# 刪除表數據
delete = cursor.execute('delete from student;')
select3 = cursor.execute('select * from student;')
if cursor.fetchall():
    print(cursor.fetchall())
else:
    print("This is a empty table...")

# 提交
conn.commit()

cursor.close()  # 關閉遊標
conn.close()    # 關閉鏈接


# 等等 等等。。。

 

循環插入數據

# -*- coding:utf-8 -*-
# Author:Wong Du

import pymysql

# 創建鏈接
conn = pymysql.Connect(host='10.0.0.100', port=3306, user='root', passwd='123456', db='testdb')

# 建立遊標
cursor = conn.cursor()

# 循環插入列表
many_list = [
    ('zhangsan', '2011-11-11'),
    ('lisi', '2012-11-11'),
    ('wangwu', '2022-10-09'),
]

# 循環插入（插入多條內容）
cursor.executemany("insert into student (name, register_date) VALUE(%s, %s);", many_list)

# 修改遊標位置
cursor.scroll(1, mode='relative')   # 相對移動，默認爲relative
cursor.scroll(1, mode='absolute')   # 絕對移動

# fetchone()獲取一行數據、fetchmany(num)獲取指定行數據、fetchall()獲取全部行數據
cursor.execute("select * from student;")
for line in cursor.fetchall():
    print(line)

# 清楚student表的數據
cursor.execute("delete from student;")


# 提交
conn.commit()

cursor.close()  # 關閉遊標
conn.close()    # 關閉鏈接