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mysqli-PHP5.5无法向MySql内创建新表,但在MySql内正常,连接正常。急!

$con= mysqli_connect("localhost","root","","questionnair");

$sql="create table $username(id int(20) AUTO_INCREMENT primary key,questionnair_name varchar(200),questionnair varchar(200),answer_a varchar(200),answer_b varchar(200),answer_c varchar(200),answer_d varchar(200),a int(20),b int(20),c int(20),d int(20),two_code varchar(200),issuer varchar(100));";

mysqli_query($con,$sql);

回复内容:

$con= mysqli_connect("localhost","root","","questionnair");

$sql="create table $username(id int(20) AUTO_INCREMENT primary key,questionnair_name varchar(200),questionnair varchar(200),answer_a varchar(200),answer_b varchar(200),answer_c varchar(200),answer_d varchar(200),a int(20),b int(20),c int(20),d int(20),two_code varchar(200),issuer varchar(100));";

mysqli_query($con,$sql);

直接在mysql命令行下执行能成功吗?不能的话看看语法有没有问题,语法没有问题的话看看你这个用户有没有权限。