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  • mysql的数据存储

    # pycharm 连接mysql
    
    import pymysql
    
    username = input("输入用户名:")
    pwd = input("输入密码:")
    
    # 建立连接
    conn = pymysql.connect(
        host = 'localhost',
        user='root',
        password='',
        database='pymysql',
        port=3306,
        charset='utf8'
    )
    
    # 创建游标
    cur = conn.cursor()
    sql = 'select * from user(表名) where username(字段)="%s"'%(username)
    print(sql)
    
    ret = cur.execute(sql)
    print(ret) # 1 说明连接成功
    
    #关闭游标
    cur.close()
    conn.close()

    插入

    # 插入
    import pymysql
    
    username = input("输入用户名:")
    password = input("输入密码:")
    
    # 建立连接
    conn = pymysql.connect(
        host = 'localhost',
        user='root',
        password='',
        database='pymysql',
        port=3306,
        charset='utf8'
    )
    
    # 创建游标
    cur = conn.cursor()
    # sql = 'select * from user(表名) where username(字段)= "%s"'%(username)
    # print(sql)
    
    sql = """insert into user(表名)(id,username,password) values(null,%s,%s)"""
    
    
    cur.execute(sql,(username,password))
    conn.commit()
    
    
    #关闭游标
    cur.close()
    conn.close()
    # 查找
    import pymysql
    
    
    
    # 建立连接
    conn = pymysql.connect(
        host = 'localhost',
        user='root',
        password='',
        database='pymysql',
        port=3306,
        charset='utf8'
    )
    
    # 创建游标
    cur = conn.cursor()
    # sql = 'select * from user(表名) where username(字段) ="%s"'%(username)
    # print(sql)
    
    # select username,password from user where id = 1
    # select * from user
    
    sql = """
    select * from user 
    """
    cur.execute(sql)
    # result = cur.fetchall()
    result = cur.fetchmany(2)
    
    print(result)
    
    #关闭游标
    cur.close()
    conn.close()
    # 删除
    import pymysql
    
    
    
    # 建立连接
    conn = pymysql.connect(
        host = 'localhost',
        user='root',
        password='',
        database='pymysql',
        port=3306,
        charset='utf8'
    )
    
    # 创建游标
    cur = conn.cursor()
    
    
    # sql = """
    # delete from user where id= 1
    # """
    # cur.execute(sql)
    # conn.commit()
    
    sql = """
    update user(表名) set username(字段)= 'aaa' where id(字段) = 2
    """
    cur.execute(sql)
    conn.commit()
    
    
    #关闭游标
    cur.close()
    conn.close()
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  • 原文地址:https://www.cnblogs.com/kenD/p/11123605.html
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