[Mysql] Python se connecte à Mysql pour ajouter, supprimer, modifier et vérifier

1. Python se connecte à MySQL

Dans le processus de test de codage quotidien, il est souvent nécessaire de se connecter à la base de données pour des opérations d'ajout, de suppression, de modification et de requête. Ensuite, nous présenterons comment effectuer des opérations de conditionnement.

1.1. Python importe le module pymysql :

pip install PyMySQL

J'ai installé la version 1.0.2 ici

1.2, connectez l'opération mysql

1.2.1. Importez d'abord le module :

import pymysql as my
import time
from Demaxiya.openpay.untils.untils_api import read_data_yaml

1.2.2. Connectez-vous à la base de données :

class Mysql(object):

    def __init__(self, db="risk"):
        # 数据库连接重试功能和连接超时功能的DB连接
        self._max_retries_count = 2  # 设置最大重试次数
        self._conn_retries_count = 0  # 初始重试次数
        self._conn_timeout = 100  # 连接超时时间为10秒
        # mysql数据库连接
        if db == 'risk':
            self.db_host = read_data_yaml()['test']['mysql']['risk']['host']
            self.username = read_data_yaml()['test']['mysql']['risk']['user']
            self.pw = read_data_yaml()['test']['mysql']['risk']['password']
            self.dbname = read_data_yaml()['test']['mysql']['risk']['name']
        if db == 'afi':
            self.db_host = read_data_yaml()['test']['mysql']['afi']['host']
            self.username = read_data_yaml()['test']['mysql']['afi']['user']
            self.pw = read_data_yaml()['test']['mysql']['afi']['password']
            self.dbname = read_data_yaml()['test']['mysql']['afi']['name']
        if db == 'aku':
            self.db_host = read_data_yaml()['test']['mysql']['aku']['host']
            self.username = read_data_yaml()['test']['mysql']['aku']['user']
            self.pw = read_data_yaml()['test']['mysql']['aku']['password']
            self.dbname = read_data_yaml()['test']['mysql']['aku']['name']
        while self._conn_retries_count <= self._max_retries_count:
            try:
                self.db = my.connect(
                    host=self.db_host,
                    user=self.username,
                    password=self.pw,
                    db=self.dbname,
                    charset='utf8',
                    connect_timeout=self._conn_timeout)
                # cursor = self.db.cursor()#创建游标
                self.cursor = self.db.cursor(cursor=my.cursors.DictCursor)  # 查询结果以字典形式返回
                print("mysql连接success")
                break
            except:
                print("mysql连接false")
                self._conn_retries_count += 1
            time.sleep(2)
            continue

1.2.3. Nouvelle action d'insertion :

 def inserDB(self, sql):
        # 插入数据库操作
        try:
            # 执行sql
            self.cursor.execute(sql)
            self.db.commit()
            print("数据库插入操作-成功")
        except Exception as e:
            # 异常捕获
            raise e
            # 发生错误时回滚
            self.db.rollback()

1.2.4. Opération de mise à jour de la mise à jour :

    def updateDB(self, sql):
        # ''' 更新数据库操作 '''
        try:
            # 执行sql
            self.cursor.execute(sql)
            self.db.commit()
            print("更新数据库操作-成功")
        except Exception as e:
            # 异常捕获
            raise e
            # 发生错误时回滚
            self.db.rollback()

1.2.5. Interroger l'instruction select :

    def selectDB(self, sql):
        # ''' 数据库查询 '''
        while self._conn_retries_count <= self._max_retries_count:
            try:
                self.cursor.execute(sql)  # 返回 查询数据 条数 可以根据 返回值 判定处理结果
                data = self.cursor.fetchall()  # 返回查询记录列表
                if data == ():
                    return "结果为空了啊，请查看sql正确"
                    break
                else:
                    return [item[key] for item in data for key in item]
                    # print([item[key] for item in data for key in item])
                    break
            except Exception as e:
                raise e
                continue
        self.cursor.close()
        self.db.close()

1.2.6, exécuter les résultats sql

if __name__ == "__main__":
    test = 1
    sql = "select uid from `test`.`t_1` where test='{}';".format(test)
    print(sql)
    test = Mysql('test').selectDB(sql=sql)
    此时是以列表结果形式返回的：所以要test[0]这样就可以获得查询结果了