Statement executeQuery() and executeUpdate() Example

executeQuery() method is used mostly for SELECT statement and it returns the in form of ResultSet object.

executeUpdate() method is generally used by INSERT, UPDATE,  And DELETE statements. When table updated successfully then it returns 1.

An example given below illustrates the use of these methods

JDBCEexecuteExample.java

package roseindia.net;

import java.sql.Connection;
import java.sql.DriverManager;
import java.sql.ResultSet;
import java.sql.SQLException;
import java.sql.Statement;

public class JDBCEexecuteExample {
	public static void main(String[] args) throws SQLException {
		Connection connection = null; // connection reference variable for
										// getting
		// connection
		Statement statement = null; // Statement reference variable for query
		// Execution
		ResultSet resultSet = null; // ResultSet reference variable for saving
									// query
		// result
		String conUrl = "jdbc:mysql://localhost:3306/";
		String driverName = "com.mysql.jdbc.Driver";
		String databaseName = "student";
		String usrName = "root";
		String usrPass = "root";
		try {
			// Loading Driver
			Class.forName(driverName);
		} catch (ClassNotFoundException e) {
			System.out.println(e.toString());
		}
		try {
			// Getting Connection
			connection = DriverManager.getConnection(conUrl + databaseName,
					usrName, usrPass);
			// setting connection autocommit false
			connection.setAutoCommit(false);
			// Getting reference to connection object
			statement = connection.createStatement();
			// creating Query String
			String updateQuery = "UPDATE student SET NAME='Rajan' WHERE RollNo=1";
			String selectQuery = "SELECT * FROM student";
			String insertQuery = "INSERT INTO student values(4,'Rohan','MCA','Mumbai')";
			String deleteQuery = "DELETE FROM student WHERE RollNo=4";
			// Insert Query
			statement.executeUpdate(insertQuery);
			// Updating Query
			int result = statement.executeUpdate(updateQuery);
			if (result == 1) {
				System.out.println("Table Updated Successfully.......");
			}
			// Delete Query
			statement.executeUpdate(deleteQuery);
			// excecuting query
			resultSet = statement.executeQuery(selectQuery);
			while (resultSet.next()) {
				// Didplaying data of tables
				System.out.println("Roll No " + resultSet.getInt("RollNo")
						+ ", Name " + resultSet.getString("Name") + ", Course "
						+ resultSet.getString("Course") + ", Address "
						+ resultSet.getString("Address"));
			}
		} catch (Exception e) {
			System.out.println(e.toString());
		} finally {
			// Closing connection
			resultSet.close();
			statement.close();
			connection.close();
		}
	}
}

Download this example code

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