python操作mysql数据库之查询数据库

在用Python操作MySQL数据库之前，需先安装第三方库，我这里用的是pymysql：

pip install pymysql

还有其他第三方库如：mysqldb。可以在官网下载：https://pypi.org/  

# coding=utf-8
import pymysql

class Mysql_search():
    def __init__(self):
        try:
            self.conn = pymysql.connect(host="192.168.1.86",
                                   user="root",
                                   password="pwd123",
                                   db="TEST",
                                   charset="utf8")

            self.cursor = self.conn.cursor()
        except pymysql.err as e:
            print("error" % e)

    def get_one(self):
        sql = "select * from api_test where method = %s order by id desc"
        self.cursor.execute(sql, ('post',))
        # print(dir(self.cursor))
        # print(self.cursor.description)
        # 获取第一条查询结果，结果是元组
        rest = self.cursor.fetchone()
        # 处理查询结果，将元组转换为字典
        result = dict(zip([k[0] for k in self.cursor.description], rest))
        self.cursor.close()
        return result

    def get_all(self):
        sql = "select * from api_test where method = %s order by id desc"
        self.cursor.execute(sql, ('post',))
        # 获取第一条查询结果，结果是元组
        rest = self.cursor.fetchall()
        # 处理查询结果，将元组转换为字典
        result = [dict(zip([k[0] for k in self.cursor.description], row)) for row in rest]
        self.cursor.close()
        return result

    def db_close(self):
        self.conn.close()


if __name__ == '__main__':
    obj = Mysql_search()
    # result = obj.get_one()
    # print(result)
    # print(result['url'])
    reslt = obj.get_all()
    for item in reslt:
        print(item)
        print("-"*10)
    obj.db_close()