thinkphp框架下.查询数据库某表用户名字段是否唯一失效,解决方法

1.查询:

$data['menber_name']为查询的字段

$result =M('menber') ->where('menber_name=' . $data['menber_name'])->select();

$where='menber_name='.'"'.$menber_name.'"';
$a=M('menber');
$result = $a->where($where)->select();
结果:

SELECT * FROM `do_menber` WHERE ( menber_name="1" );