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JDBC Practice Projects
Last Updated : 26 May, 2026
title: JDBC Mini Projects
JDBC19 words1 headingsExamples included
title: JDBC Mini Projects description: JDBC ke saath practice projects
1. Student Management — Complete DAO
java exampleWoHoTech
class StudentDAO {
private static final String URL = "jdbc:mysql://localhost:3306/school";
private static final String USER = "root";
private static final String PASS = "password";
Connection getConn() throws SQLException {
return DriverManager.getConnection(URL, USER, PASS);
}
// Create
int create(String name, int age, double marks) throws SQLException {
String sql = "INSERT INTO students (name, age, marks) VALUES (?, ?, ?)";
try (Connection c = getConn();
PreparedStatement ps = c.prepareStatement(sql, Statement.RETURN_GENERATED_KEYS)) {
ps.setString(1, name); ps.setInt(2, age); ps.setDouble(3, marks);
ps.executeUpdate();
ResultSet keys = ps.getGeneratedKeys();
return keys.next() ? keys.getInt(1) : -1;
}
}
// Read
void printAll() throws SQLException {
try (Connection c = getConn();
Statement s = c.createStatement();
ResultSet rs = s.executeQuery("SELECT * FROM students ORDER BY marks DESC")) {
System.out.printf("%-5s %-15s %-5s %-8s%n", "ID", "Name", "Age", "Marks");
System.out.println("-".repeat(35));
while (rs.next())
System.out.printf("%-5d %-15s %-5d %-8.2f%n",
rs.getInt("id"), rs.getString("name"),
rs.getInt("age"), rs.getDouble("marks"));
}
}
// Update
void updateMarks(int id, double marks) throws SQLException {
String sql = "UPDATE students SET marks = ? WHERE id = ?";
try (Connection c = getConn(); PreparedStatement ps = c.prepareStatement(sql)) {
ps.setDouble(1, marks); ps.setInt(2, id);
System.out.println(ps.executeUpdate() + " row updated");
}
}
// Delete
void delete(int id) throws SQLException {
try (Connection c = getConn();
PreparedStatement ps = c.prepareStatement("DELETE FROM students WHERE id = ?")) {
ps.setInt(1, id);
System.out.println(ps.executeUpdate() + " row deleted");
}
}
}Exam Focus
Revise definitions, diagrams, examples, and short-answer points for JDBC Practice Projects.
Interview Use
Prepare one clear explanation, one practical example, and one common mistake for this Java topic.
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