题目内容

能关闭以下数据库连接的代码是$con=mysqli_connect('localhost','root','123456','yzdata');

A. mysql_close($con);
B. mysqli_close($con);
C. mysql_close();
D. mysqli_close();

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$user=$_POST['username'];//账号$pwd=$_POST['password'];//密码数据库userinfo表中保存账号和密码字段分别是username和pasword,则查询账号和密码是否正确的sql语句是select * from ________ where __________ and _________;

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PHP中统计查询结果记录数的函数是

A. mysqli_rows( )
B. mysqli_num_rows( )
C. mysqli_num_row( )
D. mysqli_num( )

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