Python3-pymysql模块-数据库操作之MySQL

博客转载

　　http://www.cnblogs.com/alex3714/articles/5950372.html

代码示例

import pymysql

conn = None
cursor = None
try:
    # 连接数据库
    conn = pymysql.connect(host='13.13.13.123', port=3306, user='root', passwd='******', db='db_name')
    # 获取游标对象
    cursor = conn.cursor()
    # 执行insert语句
    sql = "insert into tab_student(name,age,sex) values(%s,%s,%s)"
    sql_args = ("Joey1", 47, 1)
    row_count = cursor.execute(sql, sql_args)
    print(row_count)    # 受影响的行数
    # 执行多个insert语句
    sql = "insert into tab_student(name,age,sex) values(%s,%s,%s)"
    sql_args = [("Joey2", 47, 1),
                ("Joey3", 47, 1),
                ("Joey4", 47, 1),
                ("Joey5", 47, 1),
                ]
    row_count = cursor.executemany(sql, sql_args)
    print(row_count)    # 受影响的行数
    # 提交事务
    conn.commit()
except Exception as ex:
    conn.rollback()
finally:
    # 关闭游标与数据库连接
    cursor.close()
    conn.close()

增-INSERT

---

import pymysql

conn = None
cursor = None
try:
    # 连接数据库
    conn = pymysql.connect(host='13.13.13.123', port=3306, user='username', passwd='password', db='db_name')
    # 获取游标对象
    cursor = conn.cursor()
    # 执行delete语句
    sql = "delete from tab_student where name = %s and age = %s "
    sql_args = ("Joey", 47,)
    row_count = cursor.execute(sql, sql_args)
    print(row_count)    # 受影响的行数
    # 提交事务
    conn.commit()
except Exception as ex:
    conn.rollback()
finally:
    # 关闭游标与数据库连接
    cursor.close()
    conn.close()

删-DELETE

---

import pymysql
conn = None
cursor = None
try:
    # 连接数据库
    conn = pymysql.connect(host='13.13.13.123', port=3306, user='username', passwd='password', db='db_name')
    # 获取游标对象
    cursor = conn.cursor()
    # 执行update语句
    sql = "update tab_student set name = %s where name like %s "
    sql_args = ("Jet", "J%",)
    row_count = cursor.execute(sql, sql_args)
    print(row_count)    # 受影响的行数
    # 提交事务
    conn.commit()
except Exception as ex:
    conn.rollback()
finally:
    # 关闭游标与数据库连接
    cursor.close()
    conn.close()

改-UPDATE

---

import pymysql

conn = None
cursor = None
try:
    # 连接数据库
    conn = pymysql.connect(host='13.13.13.123', port=3306, user='username', passwd='password', db='db_name')
    # 获取游标对象
    cursor = conn.cursor()
    # 执行update语句
    sql = "select * from tab_student where name = %s "
    sql_args = ("Jet", )
    row_count = cursor.execute(sql, sql_args)
    print(row_count)    # 查询结果的行数
    # 获取查询结果
    result = cursor.fetchone()    # 提取一行查询结果
    # result = cursor.fetchall()    # 提取全部查询结果
    # result = cursor.fetchmany(3)    # 提取指定行的查询结果
    print(result)
except Exception as ex:
    conn.rollback()
finally:
    # 关闭游标与数据库连接
    cursor.close()
    conn.close()

查-SELECT

---