I want to know if is there a way of change the driver used by Microsoft Access to extract data (only use select like querys) from Oracle 9i data base.
The Access to Oracle connection is made using an external data source (linked table) and usually the default Access driver is ODBC for ORACLE, but I want to change that and use a JDBC driver for ORACLE instead.
Thanks in advance.
The Access to Oracle connection is made using an external data source (linked table) and usually the default Access driver is ODBC for ORACLE, but I want to change that and use a JDBC driver for ORACLE instead.
I'm fairly certain that this is impossible. Access linked tables connect via Jet/ACE (for links to another Access database), or ODBC (for all other data sources). JDBC is not an option.
Related
I'm trying to establish a connection to a DB2 database using a database link in Oracle.
The final objective is to be able to do a "create table XXX as select * from YYY#DB2"
I can connect directly to the DB2 database using SQL Developer and the db2jcc.jar connector but i can't create the database link.
Additionaly, when i use the feature "Migrate to Oracle..." on SQL Developer it just dump a java exception.
Thanks in advance,
Manuel
One way of doing this is with "heterogenous services", ie, Oracle takes via ODBC to a remote non-oracle data source.
There's a manual for this in the standard doc set:
https://docs.oracle.com/en/database/oracle/oracle-database/12.2/heter/index.html
but in a nutshell, the basic steps are:
1) have an ODBC driver for DB2 on your database server, or on a machine that your database server can reach.
2) Configure an ODBC target for that DB2 database. Lets call it "MYDB2"
3) create a file initMYDB2.ora in $ORACLE_HOME/hs/admin. Configure it as per the sample (init4g4odbc.ora). It points to your MYDB2 target.
4) In that directory, you'll also find samples for listener.ora and tnsnames.ora.
So you'll end up with a tnsnames entry called "MYDB2". It will reference the initMYDB2.ora, which will point to the MYDB2 odbc target, which will be your DB2 database.
Then you create a database link in the normal way:
create database link blah
connect to my_db2_user
identified by my_db2_password
using 'mydb2';
Hope this helps.
I have only used db links to get access to remote db so far. Now I have to find a way to use JDBC to connect to remote db and get data. Can someone guide me what all things would I need to ask the remote db admin in order to setup a jdbc connection, and once I have the connection, how do I query the database using java stored procedure, just like I am querying it over remote db right now with db link?
You've described a fairly complicated problem, but haven't given any information about your database or operating system. Are you connecting to a SQL Server database? MySQL? Are you running on Linux? Windows?
First, you'll need a driver. That's going to depend on the database, operating system and versions thereof that you're using. For example, here is the Microsoft ODBC Driver for SQL Server (Oops, looks like it's currently unavailable.)
Second, you need to set up Oracle Heterogenous Services. That's fairly complicated and not something I can answer here. You might start with the Database Gateway for ODBC User's Guide.
Oracle does have gateways for various other databases, but they're licensed additionally from the database itself.
I am trying to create db link from Oracle 11g to SQL Server 2005 using DG4MSQL gateway.
After creating db link I am not able to query SQL Server system views (sys.services or sys.objects) using JDBC driver, but I am able to query all user tables using JDBC driver.
If I use sqlplus, I am able to query all tables including system tables. Since my project is Java project, I am bound to use JDBC driver.
One more observation I made is that, if I use DG4ODBC instead of DG4MSQL gateway, then I am able to query all SQL Server tables including system tables using JDBC driver.
Please let me know if there are any ways I can query SQL Server system tables using DG4MSQL and JDBC driver?
this one is a little bit tricky to explain
An Oracle Gateway performs 3 types of operations:
SQL translations (when you query regular tables, views etc)
Data Dictionary translations (when you query system views)
Data Type transformations (for example Microsoft's date to Oracle's date)
In case of JDBC, the JDBC-ODBC bridge makes the JDBC driver perfectly compatible with the drivers included in DG4ODBC. Therefore, JDBC plus DG4ODBC allows you to perform all the transformations above.
The problem is that DG4MSQL uses a proprietary driver and only SQL translations can be bridged to JDBC.
As a solution to your issue, you could try to create local views on your Oracle schema, based on the remote SQL server system views. Depending on your requirements, you can even create them as materialized views.
CREATE OR REPLACE VIEW sys_services
AS SELECT *
FROM sys.services#dblink;
and then query sys_services instead of directly querying sys.services#dblink
I'm from MySQL background and am new to Oracle. I want to know
What is meant by Oracle Client?
What is its use?
What is its equivalent in MySQL ?
Thanks
What is meant by Oracle Client?
and
What is its use?
In this context, a client is a class library (DLL) that allows you to connect remotely to the underlying database of an application. A client, always within the same context, can also be called a .NET Data Provider.
You may have multiple data providers based on the underlying database engine with which you're working.
There was System.Data.OracleClient (deprecated), provided by Microsoft.
There is Oracle.Data.Client, which is actually the best ever built Oracle Client, or Oracle .NET Data Provider. You may also download the latest Oracle 11g Data Provider for .NET.
So, when accessing the Oracle underlying database, make sure your work with this provider, proper for your version of Oracle, and start doing ADO.NET with your favorite database! =P
There are also some other tools that you can work with that will ease your data access code pain, such as Enterprise Library or NHibernate, both are frameworks to basically accessing databases.
Enterprise Library can do even more then that!
And NHibernate is an ORM (Object/Relation Mapping) tool that can work just very fine with Oracle.
Remember though, always use Oracle.Data.Client namespace in the Oracle.DataAccess.dll assembly.
What is its equivalent in MySQL ?
As the equivalence for MySQL, I guess it would be MySQL Connector/NET.
It is the Oracle binaries installed that allow communication with the Oracle database. It can be using SQL*Plus, JDBC (type II or IV) or OCI (Oracle Call Interface).
Its a piece of software that allows a remote computer to talk to Oracle. If you were to write a piece of software that communicated with the database, you would use the Oracle Client to facilitate that communication
What are the steps to connect to Oracle 9i with VB6? How can I use modules and stored procedures in VB6 and how can I call an SP?
What is the method to use ADO which is helpful to insert, update, search and delete the items from the front end?
You will need ADO to connect to Oracle (add reference to microsoft activex data objects library).
You need to know where is the Oracle Instance hosted alongwith username and password?
The connection string for Oracle can be found from www.connectionstrings.com
ADODB.Connection is the one that you will need to establish the connection.
Connection has Execute method - which you can use for any insert/update/delete statements.
Now, read some documentation on ADO object library from MSDN.
And, write the code by yourself.
You can choose between the Oracle OLEDB driver (which I think comes with the Oracle client install mentioned by YogoZuno) or one from Microsoft (can't remember if it was just a standard microsoft oledb driver or one released with a nod towards oracle): in any case, the Oracle OLEDB driver is far better.
You will also need to have the Oracle client installed on your PC, along with an appropriate TNS Names file. Also, be aware that there are some minor functional differences between various versions of the Oracle 9 client - I had some issues under v9.2.0.1, that did not occur under v9.2.0.7.