Python插入操作

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添加数据

INSERT INTO 语句用于将记录添加到表中。在python中，无涯教程可以使用格式说明符(％s)代替值。

在游标的execute()方法中以元组形式提供实际值。

import mysql.connector
#创建连接对象
myconn = mysql.connector.connect(host = "localhost", user = "root",passwd = "Learnfk",database = "PythonDB")
#创建光标对象
cur = myconn.cursor()
sql = "insert into Employee(name, id, salary, dept_id, branch_name) values (%s, %s, %s, %s, %s)"

#行值以元组的形式提供
val = ("John", 110, 25000.00, 201, "Newyork")

try:
    #将值插入表中
    cur.execute(sql,val)

    #提交事务
    myconn.commit()
    
except:
    myconn.rollback()

print(cur.rowcount,"record inserted!")
myconn.close()

输出:

1 record inserted!

插入多条

无涯教程还可以使用python脚本一次插入多行。提及多行作为各种元组的列表。

在线运行复制代码

import mysql.connector
    
#创建连接对象
myconn = mysql.connector.connect(host = "localhost", user = "root",passwd = "Learnfk",database = "PythonDB")

#创建光标对象
cur = myconn.cursor()
sql = "insert into Employee(name, id, salary, dept_id, branch_name) values (%s, %s, %s, %s, %s)"
val = [("John", 102, 25000.00, 201, "Newyork"),("David",103,25000.00,202,"Port of spain"),("Nick",104,90000.00,201,"Newyork")]
    
try:
    #将值插入表中
    cur.executemany(sql,val)

    #提交事务
    myconn.commit()
    print(cur.rowcount,"records inserted!")
    
except:
    myconn.rollback()

myconn.close()

输出:

3 records inserted!

行编号

在SQL中，特定行由插入ID(称为行ID)表示。无涯教程可以使用游标对象的属性lastrowid来获取最后插入的行ID。

在线运行复制代码

import mysql.connector
#创建连接对象 
myconn = mysql.connector.connect(host = "localhost", user = "root",passwd = "Learnfk",database = "PythonDB")
#创建光标对象
cur = myconn.cursor()
    
sql = "insert into Employee(name, id, salary, dept_id, branch_name) values (%s, %s, %s, %s, %s)"
    
val = ("Mike",105,28000,202,"Guyana")
    
try:
    #将值插入表中
    cur.execute(sql,val)

    #提交事务
    myconn.commit()
    
    #获取 rowid
    print(cur.rowcount,"record inserted! id:",cur.lastrowid)

except:
    myconn.rollback()

myconn.close()