java对mysql结果集处理

ResultSet rs = statement.executeQuery(sql);
if (!rs.next()) {
    System.out.println("结果集为空");
} else {
    // 处理结果集
}

try {
    ResultSet rs = statement.executeQuery(sql);
    while (rs.next()) {
        // 处理每一行数据
    }
} catch (SQLException e) {
    e.printStackTrace();
    // 进一步处理异常
}

String sql = "SELECT * FROM users WHERE username = ? AND password = ?";
PreparedStatement pstmt = connection.prepareStatement(sql);
pstmt.setString(1, username);
pstmt.setString(2, password);
ResultSet rs = pstmt.executeQuery();

import java.sql.*;

public class ResultSetExample {
    public static void main(String[] args) {
        String url = "jdbc:mysql://localhost:3306/mydatabase";
        String user = "username";
        String password = "password";

        try (Connection conn = DriverManager.getConnection(url, user, password);
             Statement stmt = conn.createStatement();
             ResultSet rs = stmt.executeQuery("SELECT * FROM users")) {

            while (rs.next()) {
                int id = rs.getInt("id");
                String name = rs.getString("name");
                System.out.println("ID: " + id + ", Name: " + name);
            }
        } catch (SQLException e) {
            e.printStackTrace();
        }
    }
}