Java JDBC Statement Example

The Java java.sql.Statement interface is used to execute SQL statements against a relational database. You obtain a JDBC Statement from a JDBC Connection. Once you have a Java Statement instance you can execute either a database query or a database update with it. 

Learn Java JDBC at https://www.javaguides.net/p/jdbc-tutorial.html

JDBC Statement Example - Select Records 

In this example, we will use the executeQuery() method to select records from a database table using the JDBC Statement interface.

package com.javaguides.jdbc.statement.examples;

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

/**
 * Select Statement JDBC Example
 * @author Ramesh Fadatare
 *
 */
public class SelectStatementExample {
    private static final String QUERY = "select id,name,email,country,password from Users";

    public static void main(String[] args) {

        // using try-with-resources to avoid closing resources (boilerplate code)

        // Step 1: Establishing a Connection
        try (Connection connection = DriverManager
            .getConnection("jdbc:mysql://localhost:3306/mysql_database?useSSL=false", "root", "root");

            // Step 2:Create a statement using connection object
            Statement stmt = connection.createStatement();

            // Step 3: Execute the query or update query
            ResultSet rs = stmt.executeQuery(QUERY)) {

            // Step 4: Process the ResultSet object.
            while (rs.next()) {
                int id = rs.getInt("id");
                String name = rs.getString("name");
                String email = rs.getString("email");
                String country = rs.getString("country");
                String password = rs.getString("password");
                System.out.println(id + "," + name + "," + email + "," + country + "," + password);
            }
        } catch (SQLException e) {
            printSQLException(e);
        }
        // Step 4: try-with-resource statement will auto close the connection.
    }

    public static void printSQLException(SQLException ex) {
        for (Throwable e: ex) {
            if (e instanceof SQLException) {
                e.printStackTrace(System.err);
                System.err.println("SQLState: " + ((SQLException) e).getSQLState());
                System.err.println("Error Code: " + ((SQLException) e).getErrorCode());
                System.err.println("Message: " + e.getMessage());
                Throwable t = ex.getCause();
                while (t != null) {
                    System.out.println("Cause: " + t);
                    t = t.getCause();
                }
            }
        }
    }
}

Output:

1,Ram,tony@gmail.com,US,secret
3,Pramod,pramod@gmail.com,India,123
4,Deepa,deepa@gmail.com,India,123
5,Tom,top@gmail.com,India,123

Reference

https://www.javaguides.net/2018/10/jdbc-statement-interface.html