Question

Deleting from tables using mysql

Asked by: myselfrandhawa

hi experts. i am using mysql query to fetch records. i am doing the right join to check that if the record i am retieving has any associated comments and testimonials attached to it:

the query runs oK but i want to delete once it gets confirmed that comments and testimonials do exists:

i am doing like this

<cfquery datasource="#request.dsn#" username="#request.dsn_user#" password="#request.dsn_password#" name="GetRecord">
SELECT DISTINCT(ID), gall.* 
testimonials.testID, comm.commID,   
from gall 
left outer JOIN testimonials ON Gall.ID = testimonials.ImageID  
left outer JOIN comm ON Gall.ID = comm.ImageID  
where ID = <cfqueryparam value="#URL.ID#" cfsqltype="cf_sql_integer"> 
</cfquery>
 
testimonials are stored in different testimonials table.
 
now i am doing something like this:
 
<cflock name="CreateLock" timeout="30">
    <cftransaction>
    <cfif Getrecord.commID IS NOT "">
    <cfquery  datasource="#request.dsn#">
    delete from Comm
    where 
    ImageID = <cfqueryparam cfsqltype="cf_sql_numeric" value="#trim(GetRecord.ID)#">
    </cfquery>
    </cfif>
    <cfif Getrecord.testID IS NOT "">
    <cfquery  datasource="#request.dsn#">
    delete from testimonials
    where 
    ImageID = <cfqueryparam cfsqltype="cf_sql_numeric" value="#trim(GetRecord.ID)#">
    </cfquery>
    </cfif>
    </cftransaction>
  </cflock>
 
ImageID  is the field related to gall table not directly but by programming code in the above query: while testimoniql table has testID as PK
 
my query getting failed, i also look if the comments do exists they should delete else it should skip the step.
 
same for the testimonials
                                  
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Asked On
2009-09-17 at 02:49:41ID24739181
Tags

mysql

,

coldfusion

Topics

ColdFusion Application Server

,

MySQL Server

,

Cold Fusion Markup Language

Participating Experts
2
Points
500
Comments
10

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Answers

 

by: srikanthmadishettiPosted on 2009-09-17 at 05:35:45ID: 25355290

SELECT DISTINCT(ID), gall.*
testimonials.testID, comm.commID,  
from gall
left outer JOIN testimonials ON Gall.ID = testimonials.ImageID  
left outer JOIN comm ON Gall.ID = comm.ImageID  
where ID = <cfqueryparam value="#URL.ID#" cfsqltype="cf_sql_integer">


is this query working , it missing comma after gall.*

SELECT DISTINCT(ID), gall.*
testimonials.testID, comm.commID,  
from gall
left outer JOIN testimonials ON Gall.ID = testimonials.ImageID  
left outer JOIN comm ON Gall.ID = comm.ImageID  
where ID = <cfqueryparam value="#URL.ID#" cfsqltype="cf_sql_integer">

try to dump this query and see .
if yu are getting correctresults

and  does one image will havbe only one comment and one testimonail

like one image 1 with id 1 in gall table will have

mulfiple rows in testimonails and comm tables



In simple if you want to delete testimonails and comments of a image id


you candirectly query the testimonails and comm table righ twhyt do you need join

<cfquery name="test">

select imageid from testimonails where imageid = <cfqueryparam value="#URL.ID#" cfsqltype="cf_sql_integer">

</cfquery>

<cfif test.recordcount gt 0 >
delete from testimopnails where imageid = <cfqueryparam value="#URL.ID#" cfsqltype="cf_sql_integer">
</cfif>

same for comments too


 

by: srikanthmadishettiPosted on 2009-09-17 at 05:39:23ID: 25355321

hmm wait you can  use the delete query directly ,

if the records are there with that imageid it will delete them if not no rows will be deleted

 

by: myselfrandhawaPosted on 2009-09-17 at 05:47:45ID: 25355405

Ok Well the query of Distict IS ok, i tested it, actually it might have misspelled while i was typing it here:

The issue is when i store testimnoials, it store the counts of there are 5 testimonials related to image 33. so when i run the query, it shows the record 5 times. i do not know why?

what i am trying to do is:

when i delete that imageID, it should delete all the testimnoials and comments related to that imageID, there is no limit as to how many testimonial one image can have.

So this is the issue i am facing trouble

 

by: srikanthmadishettiPosted on 2009-09-17 at 06:17:13ID: 25355699

you can use this query


delete from testimopnails where imageid = <cfqueryparam value="#URL.ID#" cfsqltype="cf_sql_integer">

right

 

by: myselfrandhawaPosted on 2009-09-17 at 06:47:52ID: 25356079

will this work straight away if there is no testimonial for the related image and same for comments

 

by: srikanthmadishettiPosted on 2009-09-17 at 06:50:29ID: 25356108

that will delete the records if records exist with given id else wil not delete any records

 

by: azadisaryevPosted on 2009-09-17 at 06:53:30ID: 25356157

what you really need to do is set up proper relationship between your tables so that when a record from Gall table is deleted, associated records from other 2 tables are deleted automatically.

but here's a query that will delete all related records at once - there's no need for multiple queries:

DELETE g.*, c.*, t.*
FROM (gall g LEFT JOIN comm c ON g.ID = c.ImageID) LEFT JOIN testimonials t ON g.ID = t.ImageID
WHERE g.ID = <cfqueryparam value="#URL.ID#" cfsqltype="cf_sql_integer">

Azadi

 

by: myselfrandhawaPosted on 2009-09-17 at 06:56:51ID: 25356211

Your this query:

DELETE g.*, c.*, t.*
FROM (gall g LEFT JOIN comm c ON g.ID = c.ImageID) LEFT JOIN testimonials t ON g.ID = t.ImageID
WHERE g.ID = <cfqueryparam value="#URL.ID#" cfsqltype="cf_sql_integer">

does it will for mysql

and the LEFT JOIN can do the whole work if records exist it delete else it will not right.

so the above query will function like this:

it will delete record from gall table and if any n number of testimonials or comments exists for that specific record it will delete them too.

right

if yes. please write below right and i am gona try it and let u know what happens exactly

Thanks

 

by: azadisaryevPosted on 2009-09-17 at 06:59:16ID: 25356248

right. that's exactly how it's gonna work. and it is mysql syntax.

Azadi

 

by: myselfrandhawaPosted on 2009-09-17 at 10:15:27ID: 31629915

Multiple Delete query Solved my Issue
Thanks

20120131-EE-VQP-002

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