如何从mysql获取最近插入的自动增量ID

Question

I have a MySQL table, named war_engagement which has an auto-increment id (named w_e_id ) as primary key. I am inserting records like this

//insertion in first table
$query = "INSERT INTO war_engagement (
                `attacker_user_id` ,
                `attacker_city_id` ,
                `attacker_mode` ,
                `result`
                )
                VALUES (
                '$_SESSION[user_id]',
                '$cur_city_id',
                'default',
                ''
                )";
$rs = mysql_query($query) or die(mysql_error()." in query $query");

And if above query executes successfully then I want to insert this recently inserted auto-increment id (that is w_e_id ) as foreign key into another table named war_engagement_troops

//if first record inserted successfully then insert second table
if($rs)
{
    echo "'".$sending_troop."' ,";
        $query = "INSERT INTO war_engagement_troops (
                    `w_e_id` ,
                    `quantity` ,
                    `expired`
                    )
                    VALUES (
                    '$recently_inserted_w_e_id',
                    '$quantity',
                    '$expired'
                    )";
    $rs = mysql_query($query) or die(mysql_error()." in query $query");
    if(!$rs) echo $rs;
}

I want to get w_e_id (which is auto-increment) to assign it to $recently_inserted_w_e_id .

(I also used MAX(w_e_id) to retrieve maximum ID but it is not looking ideal way and can be mixed up in multiple users insertions).

Please give me some ideal solution to get recently inserted id/record.

Answer 1

您可以使用mysql_insert_id（）函数获取最后插入的ID，然后可以将其用作另一个表的前瞻键

Answer 2

You are looking for mysql_insert_id() function. But I strongly recommend you to use PDO

Answer 3

If you don't want to use MAX(w_e_id), Then after the INSERT statement you can use

SELECT LAST_INSERT_ID();

We can make use of mysql_insert_id() ; function as well

It will look something like this

$query = "INSERT INTO war_engagement ( `w_e_id` , ...)  VALUES ( ...);
//if first record inserted successfully then insert second table
if($rs)
{
    $query = "INSERT INTO war_engagement_troops ( `id` ,  `w_e_id` , ...)  VALUES (  '', LAST_INSERT_ID(), ....)";
                   }

Answer 4

You can use mysqli_insert_id() function or the mysqli::$insert_id property if you use the object-oriented style

http://php.net/manual/en/mysqli.insert-id.php

If using PDO, use the method PDO::lastInsertId()

http://php.net/manual/en/pdo.lastinsertid.php

Answer 5

$recently_inserted_w_e_id = mysql_insert_id();

Answer 6

SELECT TOP 1 w_e_id从war_engagement顺序由w_e_id desc