HElp needed regarding oci methods..

Question

hi,
Dont we have oci functions which perform same task like these methods in mysql : mysql_insert_id(),mysql_info(),mysql_select_db(), mysql_real_escape_string().Actually we are working on some conversion form mysql to oracle..so we need these methods...If anyone already worked in such conversion will definitely be of great help.
Thanks.
srinath.

Answer 1

Hi,
since MySQL is a completly different system, the functions to connect and access are also completely different.
Oracle doesn't use fields, which are incrementet by "auto_increment". In a Oracle DB, you will instead use a Sequence and a Trigger for this:
Let's say you have a table "katalog" with a primary key "KAID" it will look like this:
-- Creating the Sequence:
CREATE SEQUENCE SEQ_KATALOG_KAID INCREMENT BY 1 START WITH 1 MAXVALUE 999999999999 MINVALUE 1 ;
-- Creating the Trigger, to use the Sequence:
CREATE OR REPLACE TRIGGER "KT"."TR_KATALOG_KAID" before insert on "KATALOG"
for each row begin
if inserting then
if :NEW."KAID" is null then
select SEQ_KATALOG_KAID.nextval into :NEW."KAID" from dual;
end if;
end if;
end;
ALTER TRIGGER "KT"."TR_KATALOG_KAID" ENABLE;
If you need to replace mysql_insert_id, you can use:
SELECT SEQ_KATALOG_KAID.currval AS KAID from dual;
Instead of using mysql_select_db(), you can select the database to use during connecting with OCI_connect(), or OCI_logon();
To have another database connected, during the script-runtime, you can either use oci_new_connect(), or use "CONNECT username/password@host/service" as an SQL statement.
Instead of using mysql_real_escape_string(), I think you have to test every single input, before using it as a value within your SQL statements.
Greetings from Hamburg
Thorsten