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$s_sql = select username,password from t_table where username=? and password=?; $sth = $dbh->prepare($s_sql); $result = $sth->execute(array($username,$password)); $result = $sth->fetchAll();//如果不存在返回的是空的数组，如果存在就是用户名+密码
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    $sql_update = “update catalog_eav_attribute set attribute_id = ? where attribute_id = ? “; $sthupdate = $dbh1->prepare($sql_update); $aaa=$sthupdate->execute(array($col['attribute_id'],$tmp['attribute_id']));
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