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Hutool是一个小而全的Java工具类库，通过静态方法封装，降低相关API的学习成本，提高工作效率，使Java拥有函数式语言般的优雅，让Java语言也可以“甜甜的”。

There is a newer version: 5.8.34

package cn.hutool.db.ds.pooled;

import cn.hutool.core.map.MapUtil;
import cn.hutool.db.DbUtil;
import cn.hutool.setting.dialect.Props;

import java.sql.Connection;
import java.sql.DriverManager;
import java.sql.SQLException;
import java.util.Properties;

/**
 * 池化
 * @author Looly
 *
 */
public class PooledConnection extends ConnectionWraper{
	
	private final PooledDataSource ds;
	private boolean isClosed;

	/**
	 * 构造
	 *
	 * @param ds 数据源
	 * @throws SQLException SQL异常
	 */
	public PooledConnection(PooledDataSource ds) throws SQLException {
		this.ds = ds;
		final DbConfig config = ds.getConfig();

		final Props info = new Props();
		final String user = config.getUser();
		if (user != null) {
			info.setProperty("user", user);
		}
		final String password = config.getPass();
		if (password != null) {
			info.setProperty("password", password);
		}

		// 其它参数
		final Properties connProps = config.getConnProps();
		if(MapUtil.isNotEmpty(connProps)){
			info.putAll(connProps);
		}

		this.raw = DriverManager.getConnection(config.getUrl(), info);
	}
	
	public PooledConnection(PooledDataSource ds, Connection conn) {
		this.ds = ds;
		this.raw = conn;
	}

	/**
	 * 重写关闭连接，实际操作是归还到连接池中
	 */
	@Override
	public void close() {
		this.ds.free(this);
		this.isClosed = true;
	}

	/**
	 * 连接是否关闭，关闭条件：

	 * 1、被归还到池中
	 * 2、实际连接已关闭
	 */
	@Override
	public boolean isClosed() throws SQLException {
		return isClosed || raw.isClosed();
	}
	
	/**
	 * 打开连接
	 * @return this
	 */
	protected PooledConnection open() {
		this.isClosed = false;
		return this;
	}

	/**
	 * 释放连接
	 * @return this
	 */
	protected PooledConnection release() {
		DbUtil.close(this.raw);
		return this;
	}
}