Explanation of JDBC Steps:

Explanation of JDBC

Steps

They are Five Steps to Explanation of JDBC

1. Loading Driver
2. Establishing Connection
3. Executing Statements
4. Getting Results
5. Closing Database Connection


Loading Driver

Loading Database driver is very first step towards making JDBC connectivity with the database. It is necessary to load the JDBC drivers before attempting to connect to the database. The JDBC drivers automatically register themselves with the JDBC system when loaded. Here is the code for loading the JDBC driver:Class.forName(driver).newInstance();


Establishing Connection

In the above step we have loaded the database driver to be used. Now its time to make the connection with the database server. In the Establishing Connection step we will logon to the database with user name and password. Following code we have used to make the connection with the database:con = DriverManager.getConnection(url+db, user, pass);

Executing Statements

In the previous step we established the connection with the database, now its time to execute query against database. You can run any type of query against database to perform database operations. In this example we will select all the rows from employee table. Here is the code that actually execute the statements against database:ResultSet res = st.executeQuery( "SELECT * FROM employee" );

Getting Results

In this step we receives the result of execute statement. In this case we will fetch the employees records from the recordset object and show on the console.

Here is the code:

while (res.next())

{
String employeeName = res.getInt( " employee_name " );

System.out.println( employeeName );

}

Closing Database Connection

Finally it is necessary to disconnect from the database and release resources being used. If you don’t close the connection then in the production environment your application will fail due to hanging database connections. Here is the code for disconnecting the application from database:

con.close();

In this section you learnt about the JDBC Steps necessary for performing database operations.

Output

C:\vinod>javac Employee.java
C:\vinod>java Employee

Getting All Rows from employee table!

Employee Name:

Deepak Kumar

Harish

JoshiRinku roy

Vinod Kumar