What are the basic steps for JDBC connection, explain it with suitable program. give me the content for 5 marks
Question
What are the basic steps for JDBC connection, explain it with suitable program. give me the content for 5 marks
Solution
Sure, here are the basic steps for establishing a JDBC connection:
- Import the packages: Requires that you include the packages containing the JDBC classes needed for database programming. This is done by using the import keyword in Java.
import java.sql.*;
- Register the JDBC driver: This step causes the JVM to load the desired driver implementation into memory so it can fulfill your JDBC requests.
Class.forName("com.mysql.jdbc.Driver");
- Open a connection: Here, you’ll connect to your database.
Connection conn = DriverManager.getConnection(DB_URL, USER, PASS);
- Execute a query: Requires using an object of type Statement for building and submitting an SQL statement to the database.
Statement stmt = conn.createStatement();
String sql;
sql = "SELECT id, first, last, age FROM Employees";
ResultSet rs = stmt.executeQuery(sql);
- Extract data from result set: Requires that you use the appropriate ResultSet.getXXX() method to retrieve the data from the result set.
while(rs.next()){
//Retrieve by column name
int id = rs.getInt("id");
int age = rs.getInt("age");
String first = rs.getString("first");
String last = rs.getString("last");
//Display values
System.out.print("ID: " + id);
System.out.print(", Age: " + age);
System.out.print(", First: " + first);
System.out.println(", Last: " + last);
}
- Clean up the environment: Here, you need to explicitly close all database resources versus relying on the JVM's garbage collection.
rs.close();
stmt.close();
conn.close();
This is a basic example of how to establish a JDBC connection. Please replace the placeholders with your actual database URL, username, and password. Also, make sure to handle exceptions properly in your actual code.
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