Pymysql 連接 Mysql 數據庫及增刪改查操作

1.通過 pip 安裝 pymysql

pip install pymysql

 

 

 

2.測試連接

import pymysql  
#導入 pymysql ，如果編譯未出錯，即表示 pymysql 安裝成功

示例表結構

 

 

 

2.1查詢操作

import pymysql  #導入 pymysql
 
#打開數據庫連接
db= pymysql.connect(host="localhost",user="root",
     password="123456",db="test",port=3307)
 
# 使用cursor()方法獲取操作游標
cur = db.cursor()
 
#1.查詢操作
# 編寫sql 查詢語句  user 對應我的表名
sql = "select * from user"
try:
    cur.execute(sql)     #執行sql語句
 
    results = cur.fetchall()    #獲取查詢的所有記錄
    print("id","name","password")
    #遍歷結果
    for row in results :
        id = row[0]
        name = row[1]
        password = row[2]
        print(id,name,password)
except Exception as e:
    raise e
finally:
    db.close()    #關閉連接

 

2.2插入操作

import pymysql
#2.插入操作
db= pymysql.connect(host="localhost",user="root",
     password="123456",db="test",port=3307)
 
# 使用cursor()方法獲取操作游標
cur = db.cursor()
 
sql_insert ="""insert into user(id,username,password) values(4,'liu','1234')"""
 
try:
    cur.execute(sql_insert)
    #提交
    db.commit()
except Exception as e:
    #錯誤回滾
    db.rollback() 
finally:
    db.close()

 

2.3更新操作

import pymysql
#3.更新操作
db= pymysql.connect(host="localhost",user="root",
     password="123456",db="test",port=3307)
 
# 使用cursor()方法獲取操作游標
cur = db.cursor()
 
sql_update ="update user set username = '%s' where id = %d"
 
try:
    cur.execute(sql_update % ("xiongda",3))  #像sql語句傳遞參數
    #提交
    db.commit()
except Exception as e:
    #錯誤回滾
    db.rollback() 
finally:
    db.close()

 

2.4刪除操作

import pymysql
#4.刪除操作
db= pymysql.connect(host="localhost",user="root",
     password="123456",db="test",port=3307)
 
# 使用cursor()方法獲取操作游標
cur = db.cursor()
 
sql_delete ="delete from user where id = %d"
 
try:
    cur.execute(sql_delete % (3))  #像sql語句傳遞參數
    #提交
    db.commit()
except Exception as e:
    #錯誤回滾
    db.rollback() 
finally:
    db.close()