获取最后插入的varchar id，它是主键

Question

I have multiple table ,which has to be inserted using different forms and all table have one id which is primary key and its varchar (NOT NULL),So i have one class function named as id_calc($tbl,$id) where $tbl is a parameter with table name and $id is a field id .And each time while inserting this function has to be called for id.

for example: If my id is "web1" ,next when i insert it shud give "web2","web3"...... i have tried with LAST_INSERT_ID() but its not working.so i tried with fetching the max(id) and splitting the string and variable but is also giving some problem.so how can i do this.please help!!!

class first{
public function id_calc($tbl,$id)
    {
        $sql = mysql_query("SELECT max($id) FROM $tbl where $id like '%web%'");
        if($sql)
        {
            while ($row = mysql_fetch_assoc($sql)) 
             {
             $user=$row;
             $a=implode(" ",$user);

        }   
     $pattern = "/(\d+)/";
     $array = preg_split($pattern, $a, -1, PREG_SPLIT_NO_EMPTY | PREG_SPLIT_DELIM_CAPTURE);
     $new[]=$array['0'];
     $new[]=$array['1']+1;
     $result=implode("",$new);
        return $result;
        }
    }
}

this function is called like

 public function insertreport1()
    {
    $obj=new first();
    $id=$obj->id_calc(tablename,idfield);
    //insert query
    }

this is my table structure

CREATE TABLE `report` (
  `inc_id` varchar(25) NOT NULL,
  `inc_status` int(11) NOT NULL,
  `inc_date` datetime NOT NULL,
  `inc_Name` varchar(45) NOT NULL,
  `inc_Age` int(11) NOT NULL,
  `inc_Gender` varchar(45) NOT NULL,
  `inc_Mobile` varchar(45) NOT NULL,
  `inc_Address` varchar(250) NOT NULL,
  `inc_treatment` varchar(45) DEFAULT NULL,
  `inc_userid` varchar(10) NOT NULL,
  `inc_repTime` datetime NOT NULL
  PRIMARY KEY (`inc_id`),

) ENGINE=InnoDB DEFAULT CHARSET=latin1;

Answer 1

Pseudo implementation would be

alter table definition

alter table `table` add column id int(11) not null auto_increment

change code

public function id_calc($tbl,$idcol) {
    $sql = mysql_query("SELECT id FROM $tbl order by id desc limit 1");
    if($sql){
        while($row = mysql_fetch_assoc($sql));
        $id = isset($row['id']) ? $row['id'] + 1 : 1;
        return "{$idcol}{$id}";
    }
}

Hope this helps

Answer 2

我认为您可以这样做。将查询写为“ SELECT MAX（CAST（SUBSTRING（$ id，4,12）AS UNSIGNED））FROM $ tbl WHERE $ id Like'％web％'”，然后递增id为web +（max + 1）。