mysql 使用

启动服务

sudo systemctl start mysql
pip3 install pymysql

python 操作数据库：

• 定义类

import pymysqlclass MyDb(): def __init__(self, host, user, passwd, db): self.__db = pymysql.connect(host, user, passwd, db) self.__cursor = self.__db.cursor() # 增删改-数据库 def set(self, sql): try: self.__cursor.execute(sql) self.__db.commit() except Exception as e: self.__db.rollback() print('Execute Error: \n {e}') # 查-数据库 def get(self, sql, fetchone=True): self.__cursor.execute(sql) try: if fetchone == True: data = self.__cursor.fetchone() else: data = self.__cursor.fetchall() except Exception as e: print('Execute Error: \n {e}') data = None finally: return data # 关闭数据库 def close(self): self.__db.close()

• 调用

def example(): ## 实例化数据库 ### 类参数：host、user、passwd、db db = MyDb('localhost', 'root', 'zuoy123', 'test') ## 查看版本 get_version_sql = 'SELECT VERSION()' version = db.get(get_version_sql) print(f'Database Version: {version}') ## 删除表 delete_table_sql = 'DROP TABLE IF EXISTS employee' db.set(delete_table_sql) ## 新建表 new_table_sql = 'CREATE TABLE IF NOT EXISTS employee( \ id INT NOT NULL PRIMARY KEY, \ name CHAR(21) NOT NULL, \ age DOUBLE DEFAULT 18)' db.set(new_table_sql) ## 查找表 get_table_sql = 'SHOW TABLES' data = db.get(get_table_sql) if data: print(data) ## 关闭数据库 db.close()if __name__ == '__main__': example()

常用sql

DROP TABLE IF EXISTS employee;CREATE TABLE IF NOT EXISTS employee(id INT);

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