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📜  Python MySQL更新操作

📅  最后修改于: 2020-10-25 03:44:51             🧑  作者: Mango

更新操作

UPDATE-SET语句用于更新表中的任何列。以下SQL查询用于更新列。

>  update Employee set name = 'alex' where id = 110

考虑以下示例。

例

import mysql.connector

#Create the connection object 
myconn = mysql.connector.connect(host = "localhost", user = "root",passwd = "google",database = "PythonDB")

#creating the cursor object
cur = myconn.cursor()

try:
    #updating the name of the employee whose id is 110
    cur.execute("update Employee set name = 'alex' where id = 110")
    myconn.commit()
except:
    
    myconn.rollback()

myconn.close()

删除操作

DELETE FROM语句用于从表中删除特定记录。在这里，我们必须使用WHERE子句强加条件，否则将从表中删除所有记录。

以下SQL查询用于从表中删除ID为110的员工明细。

>  delete from Employee where id = 110

考虑以下示例。

例

import mysql.connector

#Create the connection object 
myconn = mysql.connector.connect(host = "localhost", user = "root",passwd = "google",database = "PythonDB")

#creating the cursor object
cur = myconn.cursor()

try:
    #Deleting the employee details whose id is 110
    cur.execute("delete from Employee where id = 110")
    myconn.commit()
except:
    
    myconn.rollback()

myconn.close()