import java.sql.Connection; import java.sql.DriverManager; import java.sql.PreparedStatement; import java.sql.ResultSet; import java.sql.Statement; public class TestSelect { /** * @param args */ public static void main(String[] args) { try { Class.forName("com.mysql.jdbc.Driver").newInstance(); Connection connection = DriverManager.getConnection("jdbc:mysql://localhost/jdbcTest?user=root&zeroDateTimeBehavior=convertToNull"); PreparedStatement stmt = connection.prepareStatement("SELECT us_id, us_loginname, us_password FROM users WHERE delmark = 0 AND us_loginname = ? AND us_password = ?"); stmt.setString(1,"beso"); stmt.setString(2,"beso"); if(stmt.executeQuery().next()) { System.err.println("Found item"); } else { System.err.println("Not Found item"); } Statement stmt2 = connection.createStatement(); ResultSet set = stmt2.executeQuery("SELECT us_id, us_loginname, us_password FROM users WHERE delmark = 0 AND us_loginname = 'beso' AND us_password = 'beso'"); if(set.next()) { System.err.println("Found item"); } else { System.err.println("Not Found item"); } } catch( Exception e ) { e.printStackTrace(); } } }