Use Oracle and Triggers to Secure Table Data

Ever deleted some tables accidently and had to waste your time doing them all over again? Oracle, in conjunciton with Triggers, provides an easy solution to this problem.

First, create a table that holds the table name. Say you create a table called SafeTable with a column names SafeTableName and the datatype varchar2. Populate this table with the table names that should not be dropped. Then go ahead and create the trigger as follows:

CREATE or REPLACE TRIGGER checkForSafeTable BEFORE DROP ON DATABASEDECLARE  TABLENAME CHAR(20);BEGIN  SELECT SafeTableName INOT TABLENAME from SafeTable   WHERE UPPER(TABLENAME)=ora_dict_obj_name;  IF sql%found THEN    RAISE_APPLICATION_ERROR(-20001,'This is a SAFE table');  END IF;EXCEPTION  WHEN no_data_found   THEN dbms_output.put_line('This table will be dropped');END;

When you create this trigger, you cannot drop any table that has an entry in the SafeTable.

Share the Post:
Share on facebook
Share on twitter
Share on linkedin

Overview

The Latest

iOS app development

The Future of iOS App Development: Trends to Watch

When it launched in 2008, the Apple App Store only had 500 apps available. By the first quarter of 2022, the store had about 2.18 million iOS-exclusive apps. Average monthly app releases for the platform reached 34,000 in the first half of 2022, indicating rapid growth in iOS app development.

microsoft careers

Top Careers at Microsoft

Microsoft has gained its position as one of the top companies in the world, and Microsoft careers are flourishing. This multinational company is efficiently developing popular software and computers with other consumer electronics. It is a dream come true for so many people to acquire a high paid, high-prestige job

your company's audio

4 Areas of Your Company Where Your Audio Really Matters

Your company probably relies on audio more than you realize. Whether you’re creating a spoken text message to a colleague or giving a speech, you want your audio to shine. Otherwise, you could cause avoidable friction points and potentially hurt your brand reputation. For example, let’s say you create a