python 操作数据库1--连接执行sql语句

Posted 2020-10-15 考鸡蛋

#!/usr/bin/env python
# -*- coding:utf-8 -*-
# @Time   : 2017/11/20 16:03
# @Author : lijunjiang
# @File   : demo.py

import MySQLdb

# 连接数据库
# host 数据库IP
# port 数据库监听端口
# user 数据库用户
# passwd 用户密码
# db 数据库名
# charset 字符集  默认uft-8

# MySQLdb.Connect 方法
#comn=MySQLdb.Connect(host="11.11.11.11",user="python",passwd="python",db="python",charset="utf8",port=3306)

# 函数型式
def connect_mysql():
    db_config = dict(host="11.11.11.11", port=3306, db="python", charset="utf8", user="python", passwd="python")
    try:
        cnx = MySQLdb.connect(**db_config)
    except Exception as err:
        raise err
    return cnx

if __name__ == "__main__":
    sql = "create table test(id int not null);"
    cnx = connect_mysql()  # 连接mysql
    cns = cnx.cursor()     # 创建一个游标对象
    # print(dir(cnx))

    try:
        cns.execute(sql)    # 执行 sql execute执行一条语句
        cns.close()         # 关闭游标
        cnx.commit()        # 提交操作
    except Exception as err:
        raise err
    finally:
        cnx.close()         # 关闭连接

# 执行多条语
    sql_many = ‘insert into test(id) value (%s);‘
    param = []
    for i in xrange(90,101):
        param.append([str(i)])
    # print(param)

    cnx = connect_mysql()  
    cus = cnx.cursor()

    try:
        cus.executemany(sql_many,param)   # executemany（）接收一个sql语句，一个列表
        # print(dir(cus))
        cus.close()
    except Exception as err:
        raise err
    finally:
        cnx.close()

# 获取执行结果

    sql_select = ‘select * from test;‘

    cnx = connect_mysql()
    cus = cnx.cursor()

    try:
        cus.execute(sql_select)

        result_one = cus.fetchone()     # fetchone()  获取一条结果
        print("resutl1 {0}",format(result_one))

        result_many = cus.fetchmany(3)   # fetchmany(n) 获取n条结果
        print("resutl1 {0}", format(result_many))

        result_all = cus.fetchall()      # fetchall()  获取所有结果
        print("resutl1 {0}", format(result_all))
        cus.close()
    except Exception as err:
        raise err
    finally:
        cnx.close()

mysql> select * from test;
+-----+
| id  |
+-----+
|  90 |
|  91 |
|  92 |
|  93 |
|  94 |
|  95 |
|  96 |
|  97 |
|  98 |
|  99 |
| 100 |
+-----+
11 rows in set (0.00 sec)