Question

Return last INSERTED record in the database

Asked by: iqDevs

Howdy,

Right now, the table in question has a primary key called `id`. We use MySQL and coldfusion. What i would like to know is how i can find the exact new record i have just inserted in a SQL query. For instance, this is how i do things now:

[CODE]

<cfquery datasource="myDSN">INSERT INTO posts SET name="#name#", body="#body#", date="#date", forumID="#forumID#"</cfquery>

<cfquery datasoure="mfDSN" name="current">SELECT id FROM posts WHERE name="#name#" AND date="#date#" AND forumID="#forumID#" LIMIT 1</cfquery>

[/CODE]


Now, there are obvious flaws with this system. If two users are creating exact post names at the exact same second (not unheard of), then its possible that my 'current' query may not actually be the one that was just inserted. Is there any good way to ensure i'm getting the correct record.

Thanks,
Travis

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Asked On
2005-11-20 at 23:13:16ID21637784
Tags

coldfusion

,

get

,

id

,

inserted

,

last

Topic

ColdFusion Application Server

Participating Experts
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Comments
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Answers

 

by: jimmy282Posted on 2005-11-20 at 23:30:38ID: 15332130

you can use this query for Mysql

Select LAST_INSERT_ID()
and this will return you the latest inserted ID.

 

by: MepsPosted on 2005-11-21 at 05:51:13ID: 15333610

Just a shot in the dark, but you could use cftransaction, wrap all your cfqueries in a cftransaction and it should on treat all the querires as a single transaction.

 

by: remmuhPosted on 2005-11-21 at 13:29:05ID: 15337281

Working off of Meps answer, yes you should put it into a <cftransaction> tag as this will kep the queries together. Within this though you should also call a SELECT statement selecting the largest ID. For instance:

<cftransaction>
       <cfquery datasource="#dbsrc#" name="insert_record">
               INSERT INTO tbl_users(username, fullName)
                                    values('testuser', 'Test User')
        </cfquery>
        <cfquery datasource = "#dbsrc#" name="getNewId">
               SELECT MAX(userId) as newUserID
               FROM tbl_users
         </cfquery>
</cftransaction>

<cfoutput>
#getNewId.newUserId#
</cfoutput>

 

by: wulfshaydePosted on 2005-11-21 at 15:30:01ID: 15338266

I use bean and Transfer Objects for most of my data manip... but here is an example of what I do:
=================================================================
      <cffunction name="create" access="public" returntype="void" output="false" hint="CRUD Method.">      
            <cfargument name="usersBean" type="users" required="true" hint="I am the users object from which to create a record." />/>

            <cfset var usersInsert = 0 />
            <cfset var usersmaxcols = 0 />

            <cftransaction>

            <cfquery name="usersInsert" datasource="#variables.dsn#">
                  INSERT INTO users
                        (
                        username, password, firstlogin, lastlogin, logins, alias, userTypeID, personnelID, active
                        )
                  VALUES (
                        <cfqueryparam cfsqltype="cf_sql_VARCHAR" value="#arguments.usersBean.getusername()#" maxlength="#arguments.usersBean.getBeanConfigValue('username').maxlength#" null="#arguments.users.isNullusername()#" />
                        , <cfqueryparam cfsqltype="cf_sql_VARCHAR" value="#Hex(trim(arguments.usersBean.getpassword()))#" maxlength="#arguments.usersBean.getBeanConfigValue('password').maxlength#" null="#arguments.users.isNullpassword()#" />
                        , <cfqueryparam cfsqltype="cf_sql_TIMESTAMP" value="#arguments.usersBean.getfirstlogin()#" maxlength="#arguments.usersBean.getBeanConfigValue('firstlogin').maxlength#" null="#arguments.users.isNullfirstlogin()#" />
                        , <cfqueryparam cfsqltype="cf_sql_TIMESTAMP" value="#arguments.usersBean.getlastlogin()#" maxlength="#arguments.usersBean.getBeanConfigValue('lastlogin').maxlength#" null="#arguments.users.isNulllastlogin()#" />
                        , <cfqueryparam cfsqltype="cf_sql_INTEGER" value="#arguments.usersBean.getlogins()#" maxlength="#arguments.usersBean.getBeanConfigValue('logins').maxlength#" null="#arguments.users.isNulllogins()#" />
                        , <cfqueryparam cfsqltype="cf_sql_VARCHAR" value="#arguments.usersBean.getalias()#" maxlength="#arguments.usersBean.getBeanConfigValue('alias').maxlength#" null="#arguments.users.isNullalias()#" />
                        , <cfqueryparam cfsqltype="cf_sql_INTEGER" value="#arguments.usersBean.getuserTypeID()#" maxlength="#arguments.usersBean.getBeanConfigValue('userTypeID').maxlength#" null="#arguments.users.isNulluserTypeID()#" />
                        , <cfqueryparam cfsqltype="cf_sql_INTEGER" value="#arguments.usersBean.getpersonnelID()#" maxlength="#arguments.usersBean.getBeanConfigValue('personnelID').maxlength#" null="#arguments.users.isNullpersonnelID()#" />
                        , <cfqueryparam cfsqltype="cf_sql_CHAR" value="#arguments.usersBean.getactive()#" maxlength="#arguments.usersBean.getBeanConfigValue('active').maxlength#" null="#arguments.users.isNullactive()#" />
                        
                        )
            </cfquery>
            
            <cfquery name="usersmaxcols" datasource="#variables.dsn#">
                  select
                        max(userID) as maxuserID
                  from
                        users
            </cfquery>

            <cfset arguments.usersBean.setuserID(usersmaxcols.maxuserID, false, false)/>
            

            </cftransaction>

      </cffunction>
==============================================================
I use a cftransaction to wrap the insert and fetch and then set the userID of the bean with the results of the fetch. You could just as easily have a return and return the ID.

 

by: mmc98dl1Posted on 2005-11-21 at 22:54:49ID: 15340009

for SQL server you should use @@identity

<cftransaction>
       <cfquery datasource="#dbsrc#" name="insert_record">
               INSERT INTO tbl_users(username, fullName)
                                    values('testuser', 'Test User')
SELECT @@identity AS newUserId

        </cfquery>
      </cftransaction>

<cfoutput>
#insert_record.newUserId#
</cfoutput>

 

by: mmc98dl1Posted on 2005-11-21 at 22:56:04ID: 15340013

sorry all - didnt read the q properly.

 

by: cfMaverickPosted on 2005-11-23 at 05:29:36ID: 15349707

Couple of things, First off cftransaction is great but your DB has to support transactions and if you are using the free version of MySQL I don't believe it supports transactions so cftransaction doesn't do much for you. Second @@identtity works but it returns the last insert identity. Even inside of cftransaction its much safer to use SCOPE_IDENTITY()  there is even another one where you specifify the entity name but I can't recall it at this time.

The best Way to know your ID is to make it yourself. Use createUUID() sure its 35 characters but in the end if you want a sure fire way that will work accross as many different DBs as you can think of then createUUID() is the best solution.

-cfMav

 

by: iqDevsPosted on 2005-11-23 at 11:56:40ID: 15352936

So,
is there anyway to know if my database supports transactions? Like, if i try <cftransaction>, how will i know that it was able to lock the database? will it throw and error or just run them as two consecutive queries?

- travis
http://www.iqdevs.net/

 

by: remmuhPosted on 2005-11-23 at 12:03:51ID: 15352978

Take a look at this article while I investigate this a little more. Also what version of MySQL do you have?

http://www.samspublishing.com/articles/article.asp?p=23412&seqNum=3&rl=1

 

by: wulfshaydePosted on 2005-11-23 at 12:36:48ID: 15353187

I will get you an example using MySQL in a few hours when I get back to the office.

 

by: jimmy282Posted on 2005-11-23 at 16:08:15ID: 15354192

did u try this query,  by the way

Select LAST_INSERT_ID()

did it work

 

by: wulfshaydePosted on 2005-11-23 at 16:16:44ID: 15354218

Okay, I am using version 4.1.11 of MySQL and this is how I perform a transactional write and retrieval of the last record. Again, I set to a bean object, so the idea for you would be the same, however, you would most likely just return a variable (string, integer, whatever the ID is).
================================================================
      <cffunction name="create" access="public" returntype="void" output="false" hint="CRUD Method.">      
            <cfargument name="articleBean" type="article" required="true" hint="I am the article object from which to create a record." />/>

            <cfset var articleInsert = 0 />
            <cfset var articlemaxcols = 0 />

            <cftransaction>

            <cfquery name="articleInsert" datasource="#variables.dsn#">
                  INSERT INTO article
                        (
                        art_Title, art_Contents, art_Author, art_Creation_Date, art_Published, art_MenuID, art_Order, art_Locked, art_Default
                        )
                  VALUES (
                        <cfqueryparam cfsqltype="cf_sql_VARCHAR" value="#arguments.articleBean.getart_Title()#" maxlength="#arguments.articleBean.getBeanConfigValue('art_Title').maxlength#" null="#arguments.articleBean.isNullart_Title()#" />
                        , <cfqueryparam cfsqltype="cf_sql_LONGVARCHAR" value="#arguments.articleBean.getart_Contents()#" maxlength="#arguments.articleBean.getBeanConfigValue('art_Contents').maxlength#" null="#arguments.articleBean.isNullart_Contents()#" />
                        , <cfqueryparam cfsqltype="cf_sql_VARCHAR" value="#arguments.articleBean.getart_Author()#" maxlength="#arguments.articleBean.getBeanConfigValue('art_Author').maxlength#" null="#arguments.articleBean.isNullart_Author()#" />
                        , <cfqueryparam cfsqltype="cf_sql_TIMESTAMP" value="#arguments.articleBean.getart_Creation_Date()#" maxlength="#arguments.articleBean.getBeanConfigValue('art_Creation_Date').maxlength#" null="#arguments.articleBean.isNullart_Creation_Date()#" />
                        , <cfqueryparam cfsqltype="cf_sql_INTEGER" value="#arguments.articleBean.getart_Published()#" maxlength="#arguments.articleBean.getBeanConfigValue('art_Published').maxlength#" null="#arguments.articleBean.isNullart_Published()#" />
                        , <cfqueryparam cfsqltype="cf_sql_INTEGER" value="#arguments.articleBean.getart_MenuID()#" maxlength="#arguments.articleBean.getBeanConfigValue('art_MenuID').maxlength#" null="#arguments.articleBean.isNullart_MenuID()#" />
                        , <cfqueryparam cfsqltype="cf_sql_INTEGER" value="#arguments.articleBean.getart_Order()#" maxlength="#arguments.articleBean.getBeanConfigValue('art_Order').maxlength#" null="#arguments.articleBean.isNullart_Order()#" />
                        , <cfqueryparam cfsqltype="cf_sql_INTEGER" value="#arguments.articleBean.getart_Locked()#" maxlength="#arguments.articleBean.getBeanConfigValue('art_Locked').maxlength#" null="#arguments.articleBean.isNullart_Locked()#" />
                        , <cfqueryparam cfsqltype="cf_sql_INTEGER" value="#arguments.articleBean.getart_Default()#" maxlength="#arguments.articleBean.getBeanConfigValue('art_Default').maxlength#" null="#arguments.articleBean.isNullart_Default()#" />
                        
                        )
            </cfquery>
            
            <cfquery name="articlemaxcols" datasource="#variables.dsn#">
                  select
                        max(art_ID) as maxart_ID
                  from
                        article
            </cfquery>

            <cfset arguments.articleBean.setart_ID(articlemaxcols.maxart_ID, false, false)/>
            

            </cftransaction>

      </cffunction>
================================================================

Hope this helps some.

}Wulf{

20120131-EE-VQP-002

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