数据库连接池（database connection pool）是在 Java 中用于管理数据库连接的一种技术

package com.rucoding.demo; /** * @author LiuYiXin * @version 1.0.0 * @description */ import com.rucoding.druid.DatabaseManager; import java.sql.Connection; import java.sql.ResultSet; import java.sql.SQLException; import java.sql.Statement; public class Main { public static void main(String[] args) { Connection connection = null; Statement statement = null; ResultSet resultSet = null; try { connection = DatabaseManager.getConnection(); statement = connection.createStatement(); resultSet = statement.executeQuery("SELECT id, username, age FROM users"); while (resultSet.next()) { // 处理查询结果 int id = resultSet.getInt("id"); String username = resultSet.getString("username"); int age = resultSet.getInt("age"); System.out.println("ID: " + id + ", Username: " + username + ", Age: " + age); } } catch (SQLException e) { e.printStackTrace(); } finally { // 释放资源 if (resultSet != null) { try { resultSet.close(); } catch (SQLException e) { e.printStackTrace(); } } if (statement != null) { try { statement.close(); } catch (SQLException e) { e.printStackTrace(); } } if (connection != null) { try { connection.close(); } catch (SQLException e) { e.printStackTrace(); } } } } }