JDBC Setup and Writing first program

Core Java

Installing and Configuring stuff…
Oracle Database Setup
1) Download and install Oracle . This will take so much time and also hard disk memory.
2) Brushup basic commands like creating,alter,insert,select, etc
3) you can even try downloading Toad(This tool will expire in 30 days) or Aqual Data Studio (this tool will provide free license for personal use) . In real time projects most of the companies use this kind of tools instead of plain old PL/SQL editor.
4) Repeat step2 with the new tool.

JDBC Drivers
1) Download jdbc drivers for Oracle9i… I installed Oracle9.2.0.1 and so I downloaded  ojdbc14.jar 
2)The next step is configuring DSN
Go to controlpanel->administrativetools->ODBC sources->userDSN tab
click on “add” button –> select oracle92
fill the fields and create userDSN . I filled with my name for Data Source Name and desc …
and TNS name is what we gave during oracle installation and finally userid “scott” password “tiger”)
3) To use JDBC in Eclipse IDE we have to add the jar files to project build path
Go to Eclise IDE –>create a new project –> right click project and open properties window –> java buildpath –> add external jars–> select the driver location(ojdb14.jar) .
With this we are all set to write JDBC programs in Eclipse IDE

Writing Fisrt JDBC program:
1) Import required packages
import java.sql.*; //for JDBC package
import java.math.* //math package

optional as these r not required for current program
and oracle.sql.*

2)Registering JDBC Drivers
DriverManager.registerDriver (new oracle.jdbc.driver.OracleDriver());
3)Opening a Connection to a Database(using JDBC thin driver).
Use DriverManager.getConnection(url,username,password)
Url looks like this jdbc:oracle::thin/thick@DSN name:1521:SID
Connection conn=DriverManager.getConnection(“jdbc:oracle:thin:@lavanya:1521:lavanya”,”scott”,”tiger”);
4)Creating a Statement Object
Statement stmt = conn.createStatement();
5)Executing a Query will return a Result Set Object
ResultSet rset = stmt.executeQuery (“SELECT ename FROM emp”);
6)Processing the Result Set
while (rset.next())
System.out.println (rset.getString(1));

7)Closing the Result Set and Statement Objects
8)Closing the Connection
thats it run the program …make sure u have emp table in database. If you copy the code in italic into Eclipse editor it will run for sure.

1) Using JDBC try to insert,delete,update,select record from a database
2) Work on prepared statements.

Published in: on December 20, 2006 at 10:20 pm  Comments (4)  

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4 CommentsLeave a comment

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