Python操做MySQL（一） PyMysql篇

pymsql是Python中操做MySQL的模塊，其使用方法和MySQLdb幾乎相同，可是mysqldb不支持Python3

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下載安裝

pip3 install pymysql

使用操做

1. 執行sql

#!/usr/bin/env python
# -*- coding:utf-8 -*-
import pymysql

# 建立鏈接
conn = pymysql.connect(host='127.0.0.1', port=3306, user='root', passwd='123456', db='test',charset='utf8')
# 建立遊標
cursor = conn.cursor()

# 執行SQL，並返回收影響行數
effect_row = cursor.execute("update hosts set host = '1.1.1.2'")

# 執行帶條件SQL，並返回受影響行數
#effect_row = cursor.execute("update hosts set host = '1.1.1.2' where nid > %s", (1,))

# 執行SQL，並返回受影響行數
#effect_row = cursor.executemany("insert into hosts(host,color_id)values(%s,%s)", [("1.1.1.11",1),("1.1.1.11",2)])

# 提交，否則沒法保存新建或者修改的數據
conn.commit()

 # 獲取最新自增ID
new_id = cursor.lastrowid

# 關閉遊標
cursor.close()

# 關閉鏈接
conn.close()

2.獲取查詢數據

#!/usr/bin/env python
# -*- coding:utf-8 -*-
import pymysql

conn = pymysql.connect(host='127.0.0.1', port=3306, user='root', passwd='123', db='t1')
cursor = conn.cursor()
cursor.execute("select * from hosts")

# 獲取第一行數據
row_1 = cursor.fetchone()
print(row_1)

# 獲取前n行數據
# row_2 = cursor.fetchmany(3)

# 獲取全部數據
row_3 = cursor.fetchall()

cursor.close()
conn.close()

3.fetch數據類型

關於默認獲取的數據是元祖類型，若是想要或者字典類型的數據，使用設置遊標爲字典類型：

#!/usr/bin/env python
# -*- coding:utf-8 -*-
import pymysql

conn = pymysql.connect(host='127.0.0.1', port=3306, user='root', passwd='123', db='t1')

# 遊標設置爲字典類型
cursor = conn.cursor(cursor=pymysql.cursors.DictCursor)
r = cursor.execute("select * from hosts")

result = cursor.fetchone()
for k, v in result.items():
    print(k,v)

cursor.close()
conn.close()