Python連接mysql數據庫及簡單增刪改查操作示例代碼

1.安裝pymysql

進入cmd，輸入 pip install pymysql:

2.數據庫建表

在數據庫中，建立一個簡單的表，如圖：

3.簡單操作

3.1查詢操作

#coding=utf-8#連接數據庫測試import pymysql#打開數據庫db = pymysql.connect(host='localhost',user='root',password='root',db='test')#使用cursor()方法獲取操作游標cur = db.cursor()#查詢操作sql = 'select * from books'try: # 執行sql語句 cur.execute(sql) results = cur.fetchall() #遍歷結果 for rows in results: id = rows[0] name = rows[1] price = rows[2] bookcount = rows[3] author = rows[4] print('id: {}, name: {}, price: {}, bookcount: {}, author: {}'.format(id,name,price,bookcount,author))except Exception as e: raise efinally: db.close()

運行結果：

3.2插入操作

#coding=utf-8#插入操作import pymysqldb = pymysql.connect(host='localhost',user='root',password='root',db='test')cur = db.cursor()sql = '''insert into books(id,bookname,price,bookCount,author) values (4,’三體’,20,3,’劉慈欣’)'''try: cur.execute(sql) #提交 db.commit()except Exception as e: #錯誤回滾 db.rollback()finally: db.close()

運行結果：

3.3更新操作

#coding=utf-8#更新操作import pymysqldb = pymysql.connect(host='localhost',user='root',password='root',db='test')# 使用cursor()方法獲取游標cur = db.cursor()sql_update = 'update books set bookname = ’%s’,author = ’%s’ where id = %d'try: cur.execute(sql_update % ('邊城','沈從文',4)) #提交 db.commit()except Exception as e: #錯誤回滾 db.rollback()finally: db.close()

運行結果：

3.4刪除操作

#coding=utf-8#刪除操作import pymysqldb = pymysql.connect(host='localhost',user='root',password='root',db='test')#使用cursor()獲取操作游標cur = db.cursor()sql_delete = 'delete from books where id = %d'try: #向sql語句傳遞參數 cur.execute(sql_delete % (1)) #提交 db.commit()except Exception as e: #錯誤回滾 db.rollback()finally: db.close()

運行結果：

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