import pymysql

def select(sql):
    conn = pymysql.connect(host='localhost',user='root', passwd='123456', charset='utf8')
    cursor = conn.cursor()
    conn.select_db('goods')
    # -----------Begin----------
    # 请在下面输入查询数据的语句，完成相应功能
    command = sql
    cursor.execute(command)
    # 请在下面输入获取数据的语句，完成相应功能
    records = cursor.fetchall()
    # ------------End-----------
    # 关闭数据库连接
    cursor.close()
    conn.close()
    return records

def delete(sql):
    conn = pymysql.connect(host='localhost',user='root', passwd='123456', charset='utf8')
    cursor = conn.cursor()
    conn.select_db('goods')
    # -----------Begin----------
    # 请在下面输入查询数据的语句，完成相应功能
    command = sql
    cursor.execute(command)
    # 请在下面输入获取数据的语句，完成相应功能

    # ------------End-----------
    # 提交数据到数据库
    conn.commit()
    # 关闭数据库连接
    cursor.close()
    conn.close()


def alter(sql):
    conn = pymysql.connect(host='localhost', user='root', passwd='123456', charset='utf8')
    cursor = conn.cursor()
    conn.select_db('goods')


    command=sql
    cursor.execute(command)

    # 提交数据到数据库
    conn.commit()
    # 关闭数据库连接
    cursor.close()
    conn.close()