[Pro*C] Multiple Oracle Db connections in single application

Hi,
I'm using Pro*c for developing an application that makes use of two different user accounts, both connecting to a single local database.
I'm wondering what would be the best practice to handle both connections in my application.
Others DB engines might use "EXEC SQL [n]..." where n is the "context" or "connection identifier" provided that "EXEC SQL 2 CONNECT ..." and "EXEC SQL CONNECT " were previously executed. This makes it easy. In Oracle, things look like a little bit tricky.
Shall I be using Oracle's contexts, aren't they reserved for multithreading ? I found "CONNECT AT ...." but not sure what :db_string I shall use.
Is there another (easy) way ?
If so, a short code sample or web link would be appreciated.
Thank you !
SC

The max capacity for a data source is per node in the cluster (if it's targeted to the cluster).
So if you have 3 data sources, with max capacity of 20 each and two nodes in your cluster you should have around 3*20*2 = 120 connections.
Of course at startup WebLogic only creates the number of connections specified in the initial capacity.

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제품 : PRECOMPILERS
작성날짜 : 1997-02-04
=================================
Pro*C에서 Multiple Connection 방법
=================================
1. Explicit Connection
EXEC SQL DECLARE database_name DATABASE;
EXEC SQL CONNECT :username IDENTIFIED BY :password
AT database_name USING :database_string;
. database_name : Precompiler에서의 identifier
. database_string : remote node에 접속하는 SQL*Net syntax
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EXEC SQL AT database_name SELECT ...
EXEC SQL AT database_name INSERT ...
EXEC SQL AT database_name UPDATE ...
EXEC SQL AT database_name COMMIT ...
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EXEC SQL AT database_name EXECUTE
begin
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Dynamic Method 1에서는 execute시점에 At문을 사용한다.
EXEC SQL AT database_name EXECUTE IMMEDIATE :sql_stmt;
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사용한다.
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Hi ,
Can some one please explain me how to comprehend/understand multiple conditions in connect by prior conditions with some example data.
I am creating a table like this
CREATE TABLE FAMiLY_TREE
GRAND_FATHERID number,
FATHER_ID number,
SON_ID number,
person_name varchar(20)
INSERT INTO FAMILY_TREE (GRAND_FATHERID ,FATHER_ID , SON_ID , PERSON_NAME ) VALUES
(NULL, NULL , 5 , 'Mr X ' );
INSERT INTO FAMILY_TREE (GRAND_FATHERID ,FATHER_ID , SON_ID , PERSON_NAME ) VALUES
(null, 5 , 6 , 'Dave' );
INSERT INTO FAMILY_TREE (GRAND_FATHERID ,FATHER_ID , SON_ID , PERSON_NAME ) VALUES
(5, 6 , 7 , 'Vinny' );
INSERT INTO FAMILY_TREE (GRAND_FATHERID ,FATHER_ID , SON_ID , PERSON_NAME ) VALUES
(5, 6 , 16 , 'Omy' );
INSERT INTO FAMILY_TREE (GRAND_FATHERID ,FATHER_ID , SON_ID , PERSON_NAME ) VALUES
(5, 6 , 17 , 'Vijjy' );
INSERT INTO FAMILY_TREE (GRAND_FATHERID ,FATHER_ID , SON_ID , PERSON_NAME ) VALUES
(6, 7 , 8 , 'Vicky' );
INSERT INTO FAMILY_TREE (GRAND_FATHERID ,FATHER_ID , SON_ID , PERSON_NAME ) VALUES
(6, 7 , 9 , 'Varis' );
INSERT INTO FAMILY_TREE (GRAND_FATHERID ,FATHER_ID , SON_ID , PERSON_NAME ) VALUES
(7, 8 , 10 , 'Vshnu' );
INSERT INTO FAMILY_TREE (GRAND_FATHERID ,FATHER_ID , SON_ID , PERSON_NAME ) VALUES
(7, 8 , 11 , 'dyna' );
INSERT INTO FAMILY_TREE (GRAND_FATHERID ,FATHER_ID , SON_ID , PERSON_NAME ) VALUES
(8, 10 , 14 , 'Marry' );
INSERT INTO FAMILY_TREE (GRAND_FATHERID ,FATHER_ID , SON_ID , PERSON_NAME ) VALUES
(8, 10 , 15 , 'Mac' );
INSERT INTO FAMILY_TREE (GRAND_FATHERID ,FATHER_ID , SON_ID , PERSON_NAME ) VALUES
(7, 9 , 12 , 'Garry' );
INSERT INTO FAMILY_TREE (GRAND_FATHERID ,FATHER_ID , SON_ID , PERSON_NAME ) VALUES
(7, 9 , 13 , 'Ganny' );
SELECT
LPAD(' ', LEVEL*3) || PERSON_NAME FROM FAMILY_TREE
START WITH SON_ID= 6
CONNECT BY PRIOR SON_ID = FATHER_ID
AND PRIOR FATHER_ID = GRAND_FATHERID ;
SELECT
LPAD(' ', LEVEL*3) || PERSON_NAME FROM FAMILY_TREE
START WITH SON_ID= 6
CONNECT BY PRIOR SON_ID = FATHER_ID ;
Both These query return the same o/p
   Dave
      Vinny
         Vicky
            Vshnu
               Marry
               Mac
            dyna
         Varis
            Garry
            Ganny
      Omy
      Vijjy
Can some one please explain me comprehension of both these query or give me a example where i can understand multiple connect by prior conditions
Thanks

Maybe (something to play with)
with
family_tree as
(select 'Green' family,null ancestor,1 person,'Mr X' person_name,1900 born from dual union all
select 'Green',1,2,'Dave',1920 from dual union all
select 'Green',2,3,'Vinny',1940 from dual union all
select 'Green',2,4,'Omy',1945 from dual union all
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select 'Green',6,8,'Vshnu',1980 from dual union all
select 'Green',6,9,'Dyna',1985 from dual union all
select 'Green',8,10,'Mary',2000 from dual union all
select 'Green',8,11,'Mac',2005 from dual union all
select 'Green',7,12,'Garry',1985 from dual union all
select 'Green',7,13,'Ganny',1990 from dual union all
select 'Brown',null,14,'Joe',1950 from dual union all
select 'Brown',14,15,'Jim',1970 from dual union all
select 'Brown',14,16,'Joy',1975 from dual union all
select 'Brown',14,17,'Jay',1980 from dual union all
select 'Brown',16,18,'Jack',1995 from dual union all
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select 'Brown',18,20,'Jess',2012 from dual
select family,
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from (select family,
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                       connect_by_root(person_name) root_name,
                       connect_by_root(born) root_born,
                       person_name,
                       born,
                       row_number() over (partition by family,connect_by_root(person_name) order by born) rn
                  from family_tree
                 where level = 2
                connect by prior person = ancestor
         where connect_by_isleaf = 1
         start with rn = 1
        connect by prior root_name = root_name
               and prior family = family
               and prior rn + 1 = rn
order by family desc,root_born
Regards
Etbin

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[Pro*C] Multiple Oracle Db connections in single application

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