DbUtils的使用
DbUtils的使用
今天在看一段源码的时候，看到了可以使用DbUtils来操作Jdbc
大致研究了DbUtils ，它对Jdbc的操作进行了二次封装，这样我们对数据库的操作就更加方便了，有时间的话大家一定要研究下
http://cuics-100.iteye.com/blog/841207
这篇文章解读了DbUtils的源码 ，其实源码并不是太复杂，大家可以把源码包下载下来看看
http://baike.baidu.com/view/4877026.htm
百度百科
http://commons.apache.org/dbutils/
DbUtils官网
研究了一段 使用 org.apache.commons.dbutils.handlers的代码
package dbutils;import java.sql.Connection;import java.sql.DriverManager;import java.sql.SQLException;import java.util.Iterator;import java.util.List;import java.util.Map;import java.util.Map.Entry;import org.apache.commons.dbutils.DbUtils;import org.apache.commons.dbutils.QueryRunner;import org.apache.commons.dbutils.ResultSetHandler;import org.apache.commons.dbutils.handlers.*;public class HandlersExample{ public static void main(String[] args) { Connection conn = null; String url = "jdbc:sybase:Tds:10.47.181.179:4100?language=us_english"; String jdbcDriver = "com.sybase.jdbc3.jdbc.SybDriver"; String user = "sa"; String password = ""; DbUtils.loadDriver(jdbcDriver); try { conn = DriverManager.getConnection(url, user, password); QueryRunner qr = new QueryRunner(); // 插入一条数据 qr.update(conn, "insert into zxinweb..guestbook(id,name) values (5,'name5')"); // 采用ArrayHandler方式查询单条记录 System.out.println("....ArrayHandler...."); Object[] r1 = qr.query(conn, "select id,name from zxinweb..guestbook where id =5", new ArrayHandler()); for (int i = 0; i < r1.length; i++) { System.out.print(r1[i] + " "); } System.out.println(""); // 采用ArrayListHandler方式查询 多条记录 System.out.println("....ArrayListHandler...."); List r2 = qr.query(conn, "select id,name from zxinweb..guestbook", new ArrayListHandler()); for (int i = 0; i < r2.size(); i++) { Object[] o = (Object[]) r2.get(i); for (int x = 0; x < o.length; x++) { System.out.print(o[x] + " "); } System.out.println(" "); } // 采用BeanHandler方式查询 单条记录 System.out.println("....BeanHandler...."); Guestbook r3 = (Guestbook) qr.query(conn, "select id,name from zxinweb..guestbook", new BeanHandler( Guestbook.class)); System.out.println(r3); // 采用BeanListHandler方式查询 System.out.println("....BeanListHandler...."); List<Guestbook> r4 = (List) qr.query(conn, "select id,name from zxinweb..guestbook", new BeanListHandler( Guestbook.class)); for (int i = 0; i < r4.size(); i++) { Guestbook gb = r4.get(i); System.out.println(gb); } // 采用BeanMapHandler方式查询 查询多条 System.out.println("....BeanMapHandler...."); ResultSetHandler<Map<Integer, Guestbook>> h5 = new BeanMapHandler(Guestbook.class, "id"); Map<Integer, Guestbook> r5 = qr.query(conn, "select id,name from zxinweb..guestbook", h5); Guestbook g5 = r5.get(1); // jane's id is 1 Iterator<Entry<Integer, Guestbook>> it5 = r5.entrySet().iterator(); while (it5.hasNext()) { System.out.println(it5.next()); } // 采用ColumnListHandler方式查询 获取单个字段多条记录 System.out.println("....ColumnListHandler...."); List lName = (List) qr.query(conn, "select id,name from zxinweb..guestbook", new ColumnListHandler("name")); for (int i = 0; i < lName.size(); i++) { String name = (String) lName.get(i); System.out.println(name); } // 采用KeyedHandler方式查询 单个字段多条 System.out.println("....KeyedHandler...."); ResultSetHandler h7 = new KeyedHandler("id"); Map map7 = (Map) qr.query(conn, "select id, name from zxinweb..guestbook", h7); Iterator<Entry<Integer, Map<String, String>>> it7 = map7.entrySet().iterator(); while (it7.hasNext()) { Entry<Integer, Map<String, String>> entry = it7.next(); System.out.println(entry.getKey() + " " + entry.getValue().get("name")); } // 采用MapHandler方式查询 单条记录 System.out.println("....MapHandler...."); Map map8 = (Map) qr.query(conn, "select id,name from zxinweb..guestbook where id =5 ", new MapHandler()); if (map8 != null) { System.out.println(map8.get("name")); } // 采用MapListHandler方式查询 System.out.println("....MapListHandler...."); List results2 = (List) qr.query(conn, "select id,name from zxinweb..guestbook", new MapListHandler()); for (int i = 0; i < results2.size(); i++) { Map gb = (Map) results2.get(i); System.out.println(gb.get("id") + " " + gb.get("name")); } // 采用ScalarHandler方式查询 System.out.println("....ScalarHandler...."); String name = (String) qr.query(conn, "select id,name from zxinweb..guestbook where id =5", new ScalarHandler("name")); System.out.println(name); // 删除一条数据 qr.update(conn, "delete from zxinweb..guestbook where id =5 "); } catch (SQLException e) { e.printStackTrace(); } finally { DbUtils.closeQuietly(conn); } }}....ArrayHandler....5 name5 ....ArrayListHandler....1 name1 2 name2 5 name5 ....BeanHandler....dbutils.Guestbook:[ id:1 name:name1]....BeanListHandler....dbutils.Guestbook:[ id:1 name:name1]dbutils.Guestbook:[ id:2 name:name2]dbutils.Guestbook:[ id:5 name:name5]....BeanMapHandler....1=dbutils.Guestbook:[ id:1 name:name1]2=dbutils.Guestbook:[ id:2 name:name2]5=dbutils.Guestbook:[ id:5 name:name5]....ColumnListHandler....name1name2name5....KeyedHandler....1 name12 name25 name5....MapHandler....name5....MapListHandler....1 name12 name25 name5....ScalarHandler....name5