How to connect java and Oracle?

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Hello everyone,

I am developing Java project with netbeans. I completed all the parts(GUI and java code) I want to connect to database keep some information in database for example I want to add new user via textbox to database. However I couldnt Connect it.
Here is my code guys please help me that project is so important for me.

Java

 private void jButton1ActionPerformed(java.awt.event.ActionEvent evt) {                                         
try {
    Connection con=null;
    Class.forName("oracle.jdbc.driver.OracleDriver");
    con=DriverManager.getConnection(
        "jdbc:oracle:thin:@localhost:1521:orcl",
        "plsql_staj",
        "plsql_staj1");
    Statement s=con.createStatement();
    s.execute("INSERT INTO E_USER VALUES(((u_name,u_pass,u_role)('"+txtAddUserName.getText()+"','"+txtAddUserPassWord.getText()+"','"+cmbAddUserRole.getSelectedItem().toString()+"')");
    s.close();
    con.close();
   } 
 catch(ClassNotFoundException | SQLException e){}
 
    }

There is no error on netbeans. However button does not work. I am adding

C#

import Oracle.jdbc.pool.OracleDataSource;

this import but this time I am taking "package oracle.jdbc.pool does not exist" error.

Please please please. That is my graduation project. If you cannot solve please announce it.

Thanks.

Posted 1-Aug-12 3:55am

FoxRoot

Updated 8-Jun-18 3:33am

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Aditya Mangipudi · Accepted Answer · 2012-08-01T04:53:00

Have you registered the driver?

C#

DriverManager.registerDriver(new oracle.jdbc.driver.OracleDriver());

Try Following these steps (Check if you missed anything):
1) Import the following packages in your java file:***********

Java

import java.sql.*;
import oracle.jdbc.driver.*;
import oracle.sql.*;

2) Load and Register the JDBC driver:***********

Java

DriverManager.registerDriver(new oracle.jdbc.driver.OracleDriver());

or you can use

Java

Class.forName("oracle.jdbc.driver.OracleDriver");

3) Connect to database:***********
a) If you are using oracle oci driver,you have to use:

Java

Connection conn = DriverManager.getConnection("jdbc:oracle:oci8:@oracle.world", "root", "root");

where oracle.world is the TNSNAMES entry and root is the username and password.
b) If you are using oracle thin driver,you have to use:

Java

Connection conn = DriverManager.getConnection ("jdbc:oracle:thin:@localhost:3306:mydatabase","root", "root");

where localhost is the host,3306 is the port, mydatabase is the database and root is the username and password.
4) Querying the database:**********
a)create statement:

Java

Statement st = conn.createStatement();

b)write query and execute the query:

Java

ResultSet rs = st.executeQuery("SELECT * from student");

5) Close the statement,resultset and connection:**********

Java

rs.close();
st.close();
conn.close();

FoxRoot · Accepted Answer · 2012-08-01T23:47:00

Aditaya I don't know how to thank you. That was the best. Thank you thank you so much.
I have some problems again. How could I understan my driver is oci or thin ? I tried both but I am taking "java.sql.SQLException: Io exception: The Network Adapter could not establish the connection" error.

Java

try {
         DriverManager.registerDriver(new oracle.jdbc.driver.OracleDriver());
         Connection conn = DriverManager.getConnection ("jdbc:oracle:thin:@localhost:3306:O10G","plsql_staj", "plsql_staj1");
         Statement st = conn.createStatement();
         ResultSet rs = st.executeQuery("SELECT * from E_USER");
         rs.close();
         st.close();
         conn.close();
     } catch (SQLException ex) {
         Logger.getLogger(AddNewUser.class.getName()).log(Level.SEVERE, null, ex);
     }

When I used the other option which is

Java

Connection conn = DriverManager.getConnection("jdbc:oracle:oci8:@oracle.world", "plsql_staj", "plsql_staj1");

I am taking another error which is:
Exception in thread "AWT-EventQueue-0" java.lang.UnsatisfiedLinkError: no ocijdbc9 in java.library.path
Here is my PLSQL connection screen.
http://www.imagetoo.com/images/untitlzhz.jpg[^]

How to connect java and Oracle?

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