Accessing an API through a Database Link

Hi,
I am using Jdeveloper 11.1.2.2.0
My use case is that, I need to access an API through a DB Link and pass some parameters/data using this DB link into the API and commit it into the remote database.
I will be having a page from where I will passing the parameters, which should be committed into the database of the API provider.
For this I have created a DB link and tried to query data from the remote database tables, its working.
How to pass the parameters into the API using DB link and commit it into the remote database ?
Thanks,
Nigel.

Hi Frank,
Thanks for the suggestion.
But in my case I need to call the external API using a DB Link.
I am able to call the API and it is returning me the statements that the new row is being created successfully and returns the ID of the newly created row.
But when I try again to access the Database through a query it is showing all the Rows with theirs ID's and data inside them, before and after the Row which I entered.
The rows which has the ID which I entered is having no values in their columns. Is it because the data is not getting committed ?
What is the reason for this ?
Thanks,
Nigel.
Edited by: Nigel Thomas on Jun 14, 2012 2:52 AM

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Public Function returnTissues(ByVal inFrom As String, ByVal inTo As String) As DataTable
Dim tissues As New DataTable
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command.CommandText = sql
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Here is the page code:
Private Sub ButtonSearchByRange_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles ButtonSearchByRange.Click
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My ENV:
Local DB 8.1.7.3 - I think
Remote DB 9 release 2
OPD: 9.2.0.4.01

Further testing has revealed:
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I think the datbase link is the solution for this. But how to achieve the security restrictions through the database link.We want the database servers IP and SID names are trying to keep secret. How to manage this situation?
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First of all, I believe you full knowledge of how Database Links work. how they are created and the different parameters and options when spcifying the user and database?

Report over database link error

Good morning all.
I have a database link LINKA from USERA on LOCALSERVER to USERB on REMOTESERVER.
(create database link LINKA connect to USERB identified by mypassword using validtns)
In USERC on REMOTESERVER I have a TABLEX, with grant all on TABLEX to USERB on REMOTESERVER.
In USERB on REMOTESERVER I have a view TABLEXV, select * from USERC.TABLEX
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I also have a view TABLEXV on USERA, select * from TABLEXV@LINKA. I can also select/insert/update/delete from USERA.TABLEXV.
So far so good - all working as expected.
Then, my APEX app on LOCALSERVER, interactive report, parsing schema USERA, querying TABLEXV, I get the following:
when "Exclude Link Column", I get the error "The requested URL /pls/apex/f was not found on server.
when "Link to Single Row View", report displays correctly.
when "Link to Custom Target", I get the error "The requested URL /pls/apex/f was not found on server.
When I run the select * from TABLEXV as a regular report (i.e. not interactive), I also get the error.
So the only time I get the report displayed correctly is using IR and "Link to Single Row View".
However, clicking on the link (for Single Row View) I get "The requested URL /pls/apex/wwv_flow.show was not found on this server.".
To summarize:
- accessing table via view over database link
- works outside of apex without issue
- inside only works when Link to Single Row View set
- But clicking on link fails
I could live with just having the Link to Singe Row View option if I could disable displaying of the icon so that the user cant click on it.
APEX 3.2.00.27
EE Database - 10.2.0.3 (yes I know out of support)
Remote EE Database - 10.2.0.5
Real object names replaced to protect the innocent!
Anyone got any clues?
I have used remote tables many times in my APEX applications and never had this issue.
Thanks,
Rob @ very confused .com

Good morning all.
I have a database link LINKA from USERA on LOCALSERVER to USERB on REMOTESERVER.
(create database link LINKA connect to USERB identified by mypassword using validtns)
In USERC on REMOTESERVER I have a TABLEX, with grant all on TABLEX to USERB on REMOTESERVER.
In USERB on REMOTESERVER I have a view TABLEXV, select * from USERC.TABLEX
From USERA on LOCALSERVER I can select * from TABLEXV@LINKA. In fact I can insert/update/delete tablexv from USERA.
I also have a view TABLEXV on USERA, select * from TABLEXV@LINKA. I can also select/insert/update/delete from USERA.TABLEXV.
So far so good - all working as expected.
Then, my APEX app on LOCALSERVER, interactive report, parsing schema USERA, querying TABLEXV, I get the following:
when "Exclude Link Column", I get the error "The requested URL /pls/apex/f was not found on server.
when "Link to Single Row View", report displays correctly.
when "Link to Custom Target", I get the error "The requested URL /pls/apex/f was not found on server.
When I run the select * from TABLEXV as a regular report (i.e. not interactive), I also get the error.
So the only time I get the report displayed correctly is using IR and "Link to Single Row View".
However, clicking on the link (for Single Row View) I get "The requested URL /pls/apex/wwv_flow.show was not found on this server.".
To summarize:
- accessing table via view over database link
- works outside of apex without issue
- inside only works when Link to Single Row View set
- But clicking on link fails
I could live with just having the Link to Singe Row View option if I could disable displaying of the icon so that the user cant click on it.
APEX 3.2.00.27
EE Database - 10.2.0.3 (yes I know out of support)
Remote EE Database - 10.2.0.5
Real object names replaced to protect the innocent!
Anyone got any clues?
I have used remote tables many times in my APEX applications and never had this issue.
Thanks,
Rob @ very confused .com

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Anybody knows this issue ?
Thanks,
Ricardo

Hi Ricardo,
The message "VLD-2771: System privileges may not allow extraction from source PROD_TAX_AVG" is merely a warning, this can (generally) be ignored.
After deploying your mapping check the PL/SQL code deployed and try to identify where the problem is.
I have encountered the issue before where the schema name is configured for the mapping overriding the location defined parameters.
To check this in the Design repository, right-click the mapping and click 'Configure'.
Expand 'Sources and Targets' and check the schema name is not hard-coded.
Cheers.

Database Link ORA-04054

Hi
I try send data from DB1 to DB2 via dblink.
I created link
CREATE DATABASE LINK MED
CONNECT TO user IDENTIFIED BY pass
USING
'(DESCRIPTION =
(ADDRESS_LIST =
(ADDRESS = (PROTOCOL = TCP)(HOST = 10.255.134.30)(PORT = 1521))
(CONNECT_DATA =
(SERVICE_NAME = med)
and I can select data from remote table without errors.
When I try Insert data to remote table (with PLSQL)
for xx in (select u.*, sm.nr_gm, sm.nazwa nazwa_miejsc from adresy u ,sl_miejscow@med sm where u.miasto=sm.ident and
not exists
(select * from PAC@med pk where pk.ident_pac=u.identyfikator and pk.jednoraz='K' )
and u.data_zap is not null)
loop
insert into PAC@MED
(ident_pac, od_daty, do_daty, adr_ulica, adr_kod, nr_domu, nr_lokalu, telefon, jednoraz,z_kim_mieszka,ident_miejsc,ident_poczty,ident_kraj, adr_gmina, WOJEW_KOD, ADR_MIEJSC)
values
( xx.identyfikator, sysdate, to_date('31/12/2099','dd/mm/yyyy'),xx.ULICA, xx.KOD,xx.DOM,xx.LOKAL,
xx.TELEFON,'K',82, xx.MIASTO, xx.MIASTO, xx.kraj, xx.nr_gm,99, xx.nazwa_miejsc);
end loop;
I have error ORA-04054: database link string does not exist.
Can you help me ??
Message was edited by:
AndyPol

I found solution.
Main problem was in GLOBAL_NAMES parameter.
This description help me:
Problem Description:
====================
You receive an ORA-02069 error during an insert to a remote database through a
database link when the insert contained a local sequence.
ORA-02069: global_names parameter must be set to TRUE for this operation
Cause: A remote mapping of the statement is required but cannot be
achieved because global_names should be set to TRUE for it to
be achieved.
Action: Issue alter session set global_names = true if possible
Problem Explanation:
====================
This is expected behaviour.
The insert statement is transformed so that it can be executed at the remote
end of the dblink. The reference to the local sequence has to be qualified so
that the remote end knows to call back to the local instance. The qualification
is made by appending @local_dbname.domain to the sequence reference if
global_names=true. When global_names=false, the code cannot make the assumption
that the qualifier will be valid and reports the error ORA-02069 'global_names
parameter must be set to TRUE for this operation'.
Search Words:
=============
DBLINK SEQUENCE GLOBAL_NAMES ORA-2069
Solution Description:
=====================
Use the following workaround:
1. Create a 'temporary' table on the local database for holding the inserts.
2. Insert the entire row into this table.
3. Insert the 'temporary' row from the temporary table to the remote table.
4. Delete the 'temporary' row from the temporary table.
This is slower but it will get around the problem. It help me
OR
Set GLOBAL_NAMES=TRUE in the init<SID>.ora - not work for me
Solution Explanation:
=====================
The first workaround bypasses the remote node having to make a
call back to the local instance to reference the local sequence.

Accessing an API through a Database Link

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