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Thursday, May 21, 2009

Altering the primary key of an Oracle Table

Eg: Table T_1 has the following columns:
NAME VARCHAR2(100) not null (primary key)

NAME is the primary key.
If we want to add INT to the primary key and make it a composite key:
1. We must first make the ID column "not null" which means it could not have any NULL entries.
2. We should drop the existing primary key.
3. Create the new primary key.

PL/SQL script to achive this:

alter table T_1 modify NAME VARCHAR2(100) NOT NULL;
alter table T_1 drop primary key;
alter table T_1 add primary key (NAME, ID);


Sunday, May 03, 2009

STL containers for message buffers in socket(-like) communications

I always wondered why custom buffer classes were used in most of our (high performance) libraries. This post made me realize that STL, as extensively used as it is, is not a golden hammer.