In the context of a mainframe rehosting project (from z/OS to Linux), we are planning to migrate DB2 z/OS to Oracle.
Currently, several Windows applications uses DB2 connect DDF/DRDA to access to DB2 z/OS data (through ODBC, JDBC).
Will it be necessary to use Oracle Database Provider for DRDA for these applications ?
Or can we simply use normal ODBC / JDBC Oracle drivers and adapt the code ?
Thanks.
You can use normal Oracle drivers (if you want your Windows odbc/jdbc applications) to access Oracle on Linux. Yes you may need to adapt some of the code and of course the connection strings. You don't need DB2-connect unless you want some applications to continue to use type-2 drivers to access DB2 on Z/OS.
Related
What happens in the background of a 'sqlldr' execution? How does it connect to the database? Is it using ODBC?
sqlldr is Oracle’s data loader utility. In general, the SQL*Loader client utility loads data into a
database at the same release level or higher.
For learning purpose change/remove the PATH environmental variable and then run the sql loader.
Like sqlplus, expdp, impdp the sqlldr utility is an OCI (Oracle Call Interface) application that uses Oracle Net (formerly called "SQL*Net" or "Net8") to connect and communicate with the database. No odbc nor jdbc.
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 setup a temporary unit test database that has DB2 style syntax. I know Derby fills this role quite nicely on our Java applications.
I have done much searching, and I have seen that you can use the JDBC DB2 driver to connect to Derby - which is cool, except it doesn't seem as true for the ODBC DB2 (or OLEDB) driver allowing a connection to Derby.
I also saw that Cloudscape had a version but following the download instructions, there is a redirect page that states:
There is no replacement for the old Cloudscape ODBC driver in IBM's world. Does anyone know of another source where I can get it? Or another way of connecting to Derby from VB6 (or of creating an ADODB.Connection in VB.net to Derby).
I suppose I would settle for an old version of Derby that the you can connect with (an old) DB2 ODBC driver.
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.
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