前几日,写了一篇关于一个 轻量级数据持久化的框架的博客(点击浏览: http://blog.csdn.net/marksinoberg/article/details/53163704 ),让我收获很多。很大的一个收获就是众多博友纷纷提出了自己的看法,让我对自己的这套程序有了更加全面的认识。

于是又对此做了进一步的完善,以期能有一个更优雅的呈现。支持了更多的拓展和自定义行为。


用法大致和之前的第一个版本相当,但是也稍有不同,下面将以一个小案例来进行阐述。

核心理念

本工具以查询为主要核心理念,即query操作为主,覆盖了多种查询方式的自动化运行流程。

其他诸如insert, update, delete以及事务操作,均由QueryRunner的update方法完成。

配备了自定义大小的数据库连接池,提升程序运行的效率,并由底层自动维护连接池的释放,申请问题。省心。

如何使用

  • Step 1:

    首先在项目的src目录下创建一个db.cfg.xml的文件,格式如下:
<?xml version="1.0" encoding="UTF-8" ?>
<project>
    <database name="mysql">
        <driver>com.mysql.jdbc.Driver</driver>
        <url>jdbc:mysql://localhost:3306/fams</url>
        <user>root</user>
        <password>mysql</password>
        <poolsize>20</poolsize>
    </database>
    ···
</project>
  • Step 2:

    通过注册的方式实现配置文件中的数据源的配置

    Dbhelper.register()即可

  • Step 3:

    主要的业务逻辑操作类QueryRunner,封装了对数据库JDBC操作的增删改查等一系列的操作。

    对于update方法的JDBC操作,我们无需手动的关闭数据库连接,仅仅简单的通过DbHelper的重载的release方法来实现对数据库连接对象,查询语句以及数据集的关闭操作,自动的维护数据库连接池。是不是感觉很省心啊。


测试实例

这里先根据数据库中的表结构来创建一个对应的Bean对象吧。

/**
 * @Date 2016年11月19日
 *
 * @author Administrator
 */

/**
 * @author 郭璞
 *
 */
public class DateTest {

    private int id;
    private String name;
    private Date date;

    @Override
    public String toString() {
        return "DateTest [id=" + id + ", name=" + name + ", date=" + date + "]";
    }

    public int getId() {
        return id;
    }

    public void setId(int id) {
        this.id = id;
    }

    public String getName() {
        return name;
    }

    public void setName(String name) {
        this.name = name;
    }

    public Date getDate() {
        return date;
    }

    public void setDate(Date date) {
        this.date = date;
    }

}

数据库内详细数据信息

mysql> use test;
Database changed
mysql> select * from datetest;
+----+----------+------------+
| id | name     | date       |
+----+----------+------------+
|  1 | dlut     | 2016-07-06 |
|  2 | 清华大学 | 2016-07-03 |
|  3 | 北京大学 | 2016-07-28 |
|  4 | Mark     | 2016-08-20 |
|  5 | Tom      | 2016-08-19 |
|  6 | Jane     | 2016-08-21 |
+----+----------+------------+
6 rows in set (0.00 sec)

mysql>

测试代码

数据库连接池测试

public static void main(String[] args) throws Exception {
        DbHelper helper = new DbHelper();
        helper.register();
        System.out.println(helper.connpool.size());
        Connection conn = helper.getConnection();
        System.out.println(helper.connpool.size());
        Connection conn1 = helper.getConnection();
        System.out.println(helper.connpool.size());
        Connection conn2 = helper.getConnection();
        System.out.println(helper.connpool.size());

        System.out.println(conn.toString());
        System.out.println(conn1.toString());
        System.out.println(conn2.toString());

        helper.release(conn);
        System.out.println(helper.connpool.size());

        PreparedStatement stmt = conn1.prepareStatement("select * from user");
        helper.release(conn2, stmt);
        System.out.println(helper.connpool.size());

        PreparedStatement stmt1 = conn1.prepareStatement("select * from user");
        ResultSet rs = stmt1.executeQuery();
        helper.release(conn2, stmt1, rs);
        System.out.println(helper.connpool.size());

        System.out.println(conn.toString());
        System.out.println(conn1.toString());
        System.out.println(conn2.toString());
    }

测试结果:

20
19
18
17
dbhelper.DbHelper$MyConnection@28c97a5
dbhelper.DbHelper$MyConnection@6659c656
dbhelper.DbHelper$MyConnection@6d5380c2
18
19
20
dbhelper.DbHelper$MyConnection@28c97a5
dbhelper.DbHelper$MyConnection@6659c656
dbhelper.DbHelper$MyConnection@6d5380c2

测试集

/**
 * @Date 2016年11月19日
 *
 * @author 郭  璞
 *
 */
package mp;

import java.sql.Connection;
import java.util.List;

import org.junit.Test;

import dbhelper.DbHelper;
import dbhelper.QueryRunner;
import handlers.BeanHandler;
import handlers.BeanListHandler;

/**
 * @author 郭  璞
 *
 */
public class TestCase {

    @Test
    public void testSingleBean() throws Exception {
        System.out.println("-----------------testSingleBean-------------------------------------");
        String sql = "select * from datetest where id=?";
        QueryRunner runner = new QueryRunner();
        DbHelper.register();

        DbHelper helper = new DbHelper();
        Connection conn = helper.getConnection();
        DateTest datetest = runner.query(conn, sql, new BeanHandler<DateTest>(DateTest.class), 1);

        System.out.println(datetest.toString());

        DbHelper.release(conn);
    }

    @Test
    public void testBeanList() throws Exception {
        System.out.println("-------------- testBeanList----------------------------------------");
        String sql = "select * from datetest";
        QueryRunner runner = new QueryRunner();
        DbHelper.register();

        DbHelper helper = new DbHelper();
        Connection conn = helper.getConnection();
        List<DateTest> dates = runner.query(conn, sql, new BeanListHandler<DateTest>(DateTest.class));
        for (DateTest date : dates) {
            System.out.println(date.toString());
        }

        DbHelper.release(conn);
    }

    @Test
    public void testBeanListWithParams1() throws Exception {
        System.out.println("--------------testBeanListWithParams1----------------------------------------");
        String sql = "select * from datetest where id in (?, ?, ?)";
        QueryRunner runner = new QueryRunner();
        DbHelper.register();

        DbHelper helper = new DbHelper();
        Connection conn = helper.getConnection();
        Object[] params = new Object[]{1, 3, 6};
        List<DateTest> dates = runner.query(conn, sql, new BeanListHandler<DateTest>(DateTest.class), params);
        for (DateTest date : dates) {
            System.out.println(date.toString());
        }

        DbHelper.release(conn);
    }

    @Test
    public void testBeanListWithParams2() throws Exception {
        System.out.println("--------------testBeanListWithParams2----------------------------------------");
        String sql = "select * from datetest where id in (?, ?, ?) or name = ?";
        QueryRunner runner = new QueryRunner();
        DbHelper.register();

        DbHelper helper = new DbHelper();
        Connection conn = helper.getConnection();
        Object[] params = new Object[]{1, 3, 6, "Mark"};
        List<DateTest> dates = runner.query(conn, sql, new BeanListHandler<DateTest>(DateTest.class), params);
        for (DateTest date : dates) {
            System.out.println(date.toString());
        }

        DbHelper.release(conn);
    }

    @Test
    public void testupdate() throws Exception {
        System.out.println("--------------testupdate----------------------------------------");
        String sql = "update datetest set name=? where name=?";
        QueryRunner runner = new QueryRunner();
        DbHelper.register();

        DbHelper helper = new DbHelper();
        Connection conn = helper.getConnection();
        Object[] params = new Object[]{"郭璞", "Mark"};

        runner.update(conn, sql, params);

        DbHelper.release(conn);
    }
}

测试结果:

-----------------testSingleBean-------------------------------------
DateTest [id=1, name=dlut, date=Wed Jul 06 00:00:00 CST 2016]

-------------- testBeanList----------------------------------------
DateTest [id=1, name=dlut, date=Wed Jul 06 00:00:00 CST 2016]
DateTest [id=2, name=清华大学, date=Sun Jul 03 00:00:00 CST 2016]
DateTest [id=3, name=北京大学, date=Thu Jul 28 00:00:00 CST 2016]
DateTest [id=4, name=郭璞, date=Sat Aug 20 00:00:00 CST 2016]
DateTest [id=5, name=Tom, date=Fri Aug 19 00:00:00 CST 2016]
DateTest [id=6, name=Jane, date=Sun Aug 21 00:00:00 CST 2016]

--------------testBeanListWithParams1----------------------------------------
DateTest [id=1, name=dlut, date=Wed Jul 06 00:00:00 CST 2016]
DateTest [id=3, name=北京大学, date=Thu Jul 28 00:00:00 CST 2016]
DateTest [id=6, name=Jane, date=Sun Aug 21 00:00:00 CST 2016]

--------------testBeanListWithParams2----------------------------------------
DateTest [id=1, name=dlut, date=Wed Jul 06 00:00:00 CST 2016]
DateTest [id=3, name=北京大学, date=Thu Jul 28 00:00:00 CST 2016]
DateTest [id=6, name=Jane, date=Sun Aug 21 00:00:00 CST 2016]

--------------testupdate----------------------------------------

数据库中对应更新结果:

mysql> use test;
Database changed
mysql> select * from datetest;
+----+----------+------------+
| id | name     | date       |
+----+----------+------------+
|  1 | dlut     | 2016-07-06 |
|  2 | 清华大学 | 2016-07-03 |
|  3 | 北京大学 | 2016-07-28 |
|  4 | Mark     | 2016-08-20 |
|  5 | Tom      | 2016-08-19 |
|  6 | Jane     | 2016-08-21 |
+----+----------+------------+
6 rows in set (0.00 sec)

mysql> select * from datetest;
+----+----------+------------+
| id | name     | date       |
+----+----------+------------+
|  1 | dlut     | 2016-07-06 |
|  2 | 清华大学 | 2016-07-03 |
|  3 | 北京大学 | 2016-07-28 |
|  4 | 郭璞     | 2016-08-20 |
|  5 | Tom      | 2016-08-19 |
|  6 | Jane     | 2016-08-21 |
+----+----------+------------+
6 rows in set (0.00 sec)

延伸

由于源代码可以随意更改,所以你可以根据自己的需求来实现私人定制。仅仅需要实现自己的handler接口就可以了。

如果你看到了这篇文章,欢迎给我提issue。当然也可以修改成你自己的工具。

相关下载链接

源码及打包好的工具jar下载

04-26 18:46