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- Because you are using one of Oracle's JDBC drivers, you declare a specific driver name string to registerDriver. You register the driver only once in your Java application. DriverManager.registerDriver (new oracle.jdbc.driver.OracleDriver).
- In this post, we will configure oracle jdbc driver. WildFly comes with only h2 database driver pre-installed. You need to configure other database specific jdbc drivers to connect to that database from WildFly.
- This method returns an object of the JDBC Connection class which needs as input a userid, password, connect string that identifies the JDBC driver to use, and the name of the database to which you want to connect. Connecting to a database is a step where you must enter Oracle JDBC driver-specific information in the getConnection method.
This quick start guide helps Java developers to successfully establish a connection to the Oracle Database. Follow these easy steps to get started: Modify the Java code and Update the Database Credentials of the database that you have access to. (a) Change the. Register JDBC Driver. You must register the driver in your program before you use it. Registering the driver is the process by which the Oracle driver's class file is loaded into the memory, so it can be utilized as an implementation of the JDBC interfaces. You need to do this registration only once in your program.
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After you've installed the appropriate driver, it is time to establish a database connection using JDBC.
The programming involved to establish a JDBC connection is fairly simple. Here are these simple four steps −
Import JDBC Packages: Add import statements to your Java program to import required classes in your Java code.
Register JDBC Driver: This step causes the JVM to load the desired driver implementation into memory so it can fulfill your JDBC requests.
Database URL Formulation: This is to create a properly formatted address that points to the database to which you wish to connect.
Create Connection Object: Finally, code a call to the DriverManager object's getConnection( ) method to establish actual database connection.
Import JDBC Packages
The Import statements tell the Java compiler where to find the classes you reference in your code and are placed at the very beginning of your source code.
To use the standard JDBC package, which allows you to select, insert, update, and delete data in SQL tables, add the following imports to your source code −
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Register JDBC Driver
You must register the driver in your program before you use it. Registering the driver is the process by which the Oracle driver's class file is loaded into the memory,so it can be utilized as an implementation of the JDBC interfaces.
You need to do this registration only once in your program. You can register a driver in one of two ways.
Approach I - Class.forName()
The most common approach to register a driver is to use Java's Class.forName() method, to dynamically load the driver's class file into memory, which automatically registers it. This method is preferable because it allows you to make the driver registration configurable and portable.
The following example uses Class.forName( ) to register the Oracle driver −
You can use getInstance() method to work around noncompliant JVMs, but then you'll have to code for two extra Exceptions as follows −
Approach II - DriverManager.registerDriver()
The second approach you can use to register a driver, is to use the static DriverManager.registerDriver() method.
You should use the registerDriver() method if you are using a non-JDK compliant JVM, such as the one provided by Microsoft.
The following example uses registerDriver() to register the Oracle driver −
Database URL Formulation
After you've loaded the driver, you can establish a connection using the DriverManager.getConnection() method. For easy reference, let me list the threeoverloaded DriverManager.getConnection() methods −
getConnection(String url)
getConnection(String url, Properties prop)
getConnection(String url, String user, String password)
Here each form requires a database URL. A database URL is an address that points to your database.
Formulating a database URL is where most of the problems associated with establishing a connection occurs.
Following table lists down the popular JDBC driver names and database URL.
| RDBMS | JDBC driver name | URL format |
|---|---|---|
| MySQL | com.mysql.jdbc.Driver | jdbc:mysql://hostname/ databaseName |
| ORACLE | oracle.jdbc.driver.OracleDriver | jdbc:oracle:thin:@hostname:port Number:databaseName |
| DB2 | COM.ibm.db2.jdbc.net.DB2Driver | jdbc:db2:hostname:port Number/databaseName |
| Sybase | com.sybase.jdbc.SybDriver | jdbc:sybase:Tds:hostname: port Number/databaseName |
All the highlighted part in URL format is static and you need to change only the remaining part as per your database setup.
Create Connection Object
We have listed down three forms of DriverManager.getConnection() method to create a connection object.
Using a Database URL with a username and password
The most commonly used form of getConnection() requires you to pass a database URL, a username, and a password:
Assuming you are using Oracle's thin driver, you'll specify a host:port:databaseName value for the database portion of the URL.
If you have a host at TCP/IP address 192.0.0.1 with a host name of amrood, and your Oracle listener is configured to listen on port 1521, and your database name is EMP, then complete database URL would be −
Now you have to call getConnection() method with appropriate username and password to get a Connection object as follows −
Using Only a Database URL
A second form of the DriverManager.getConnection( ) method requires only a database URL −
However, in this case, the database URL includes the username and password and has the following general form −
So, the above connection can be created as follows −
Using a Database URL and a Properties Object
A third form of the DriverManager.getConnection( ) method requires a database URL and a Properties object −
A Properties object holds a set of keyword-value pairs. It is used to pass driver properties to the driver during a call to the getConnection() method.
To make the same connection made by the previous examples, use the following code −
Closing JDBC Connections
At the end of your JDBC program, it is required explicitly to close all the connections to the database to end each database session. However, ifyou forget, Java's garbage collector will close the connection when it cleans up stale objects.
Relying on the garbage collection, especially in database programming, is a very poor programming practice. You should make a habit of always closing the connection with the close() method associated with connection object.
To ensure that a connection is closed, you could provide a 'finally' block in your code. A finally block always executes, regardless of an exception occurs or not.
To close the above opened connection, you should call close() method as follows −
Explicitly closing a connection conserves DBMS resources, which will make your database administrator happy.
For a better understanding, we suggest you to study our JDBC - Sample Code tutorial.
I have a Java application that uses JDBC (via JPA) that was connecting to a development database using hostname, port and Oracle SID, like this:
jdbc:oracle:thin:@oracle.hostserver1.mydomain.ca:1521:XYZ
XYZ was the Oracle SID. Now I need to connect to a different Oracle database that does not use a SID, but uses an Oracle 'Service Name' instead.
I tried this but it doesn't work:
jdbc:oracle:thin:@oracle.hostserver2.mydomain.ca:1522:ABCD
ABCD is the Service Name of the other database.
What am I doing wrong?
Jim ToughJim Tough8 Answers
Thin-style Service Name Syntax
Thin-style service names are supported only by the JDBC Thin driver. The syntax is:
@//host_name:port_number/service_name
For example:
jdbc:oracle:thin:scott/tiger@//myhost:1521/myservicename
So I would try:
jdbc:oracle:thin:@//oracle.hostserver2.mydomain.ca:1522/ABCD
Also, per Robert Greathouse's answer, you can also specify the TNS name in the JDBC URL as below:
Bert FBert FSo there are two easy ways to make this work. The solution posted by Bert F works fine if you don't need to supply any other special Oracle-specific connection properties. The format for that is:
However, if you need to supply other Oracle-specific connection properties then you need to use the long TNSNAMES style. I had to do this recently to enable Oracle shared connections (where the server does its own connection pooling). The TNS format is:
If you're familiar with the Oracle TNSNAMES file format, then this should look familiar to you. If not then just Google it for the details.
Adrien BrunelatYou can also specify the TNS name in the JDBC URL as below Ms office professional plus 2010 free download.
Chacko MathewTry this: jdbc:oracle:thin:@oracle.hostserver2.mydomain.ca:1522/ABCD
Edit: per comment below this is actualy correct: jdbc:oracle:thin:@//oracle.hostserver2.mydomain.ca:1522/ABCD (note the //)
Here is a link to a helpful article
Ahmed AshourThis discussion helped me resolve the issue I was struggling with for days. I looked around all over the internet until I found the answered by Jim Tough on May 18 '11 at 15:17. With that answer I was able to connect. Now I want to give back and help others with a complete example. Here goes:
In case you are using eclipse to connect oracle without SID. There are two drivers to select i.e., Oracle thin driver and other is other driver. Select other drivers and enter service name in database column. Now you can connect directly using service name without SID.
When using dag instead of thin, the syntax below pointing to service name worked for me. The jdbc:thin solutions above did not work.
Oracle Jdbc Thin Driver
This should be working: jdbc:oracle:thin//hostname:Port/ServiceName=SERVICE_NAME
Oracle Jdbc Driver Download
protected by cassiomolinFeb 22 at 13:50
Download Oracle 11g Driver
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