Preventing record deletion from the database

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how we can not delete item from database if that item are using in another place how we can
do with in our project give some help

Posted 13-Dec-13 0:14am

Member 10426233

Updated 13-Dec-13 0:38am

CPallini

v3

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Tom Marvolo Riddle 13-Dec-13 6:25am

records in table?please see Manfred's answer

2 solutions

Solution 2

Solution 1 is the best one. Besides you should check the existence of referred data of the element(which need to be deleted).

Recently I have answered similar question, check it out.
Handle Delete from Grid view have 2 tables with relationships[^]

Besides, Don't delete records, Change the status of Rows. By that way, you could maintain backups & get more benefits like audit. Check the below answer, explained there
Sql Table.. How to do this?[^]

Posted 13-Dec-13 2:20am

thatraja

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Manfred Rudolf Bihy 13-Dec-13 8:25am

"check the existence of referred data"
This can be hard to almost impossible if not using FK relationships.

Cheers!

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Manfred Rudolf Bihy · Accepted Answer · 2013-12-13T00:25:00

If you want to prevent a row in a table to be deleted if you still want to reference it from another table you'll have to set up a foreign key relationship between these two tables. Lets say rows in table Main have one or more records in table Details, then you need to establish a foreign key relation from table Main towards table Details. That way records in table Detail can only be deleted when they are no longer being referenced from any existing foreign key relation.

See here: Creating and Modifying FOREIGN KEY Constraints[^]

Regards,

— Manfred