Common Dbutils是操作數據庫的組件，對傳統操作數據庫的類進行二次封裝，可以把結果集轉化成List。

DBUtils包括3個包：

org.apache.commons.dbutils

org.apache.commons.dbutils.handlers

org.apache.commons.dbutils.wrappers

DBUtils封裝了對JDBC的操作，簡化了JDBC操作，可以少寫代碼。

org.apache.commons.dbutils

DbUtils 關閉鏈接等操作

QueryRunner 進行查詢的操作

org.apache.commons.dbutils.handlers

ArrayHandler ：將ResultSet中第一行的數據轉化成對象數組

ArrayListHandler將ResultSet中所有的數據轉化成List，List中存放的是 Object[]

BeanHandler ：將ResultSet中第一行的數據轉化成類對象

BeanListHandler ：將ResultSet中所有的數據轉化成List，List中存放的是類對象

ColumnListHandler ：將ResultSet中某一列的數據存成List，List中存放的是 Object對象

KeyedHandler ：將ResultSet中存成映射，key為某一列對應為Map。Map中存放的是數據

MapHandler ：將ResultSet中第一行的數據存成Map映射

MapListHandler ：將ResultSet中所有的數據存成List。List中存放的是Map

ScalarHandler ：將ResultSet中一條記錄的其中某一列的數據存成Object

org.apache.commons.dbutils.wrappers

SqlNullCheckedResultSet ：對ResultSet進行操作，改版里面的值

StringTrimmedResultSet ：去除ResultSet中中字段的左右空格。Trim()

主要方法：

DbUtils類：啟動類

ResultSetHandler接口：轉換類型接口

MapListHandler類：實現類，把記錄轉化成List

BeanListHandler類：實現類，把記錄轉化成List，使記錄為JavaBean類型的對象

Qrery Runner類：執行SQL語句的類

建立三個Java文件

命名為BeanListExample.java

Guestbook.java

MapListExample.java

源碼：

BeanListExample.java

Code

package com.sy;

import org.apache.commons.dbutils.DbUtils;

import org.apache.commons.dbutils.QueryRunner;

import org.apache.commons.dbutils.handlers.BeanListHandler;

import java.sql.Connection;

import java.sql.DriverManager;

import java.sql.SQLException;

import java.util.List;

public class BeanListExample {

public static void main(String[] args) {

Connection conn = null ;

String url = " jdbc:mysql://localhost:3306/people" ;

String jdbcDriver = " com.mysql.jdbc.Driver" ;

String user = " root " ;

String password = " hicc " ;

DbUtils.loadDriver(jdbcDriver);

try {

conn = DriverManager.getConnection(url, user, password);

QueryRunner qr = new QueryRunner();

List results = (List) qr.query(conn, " select id,name from guestbook" , new BeanListHandler(Guestbook.class ));

for ( int i = 0 ; i < results.size(); i++ ) {

Guestbook gb = (Guestbook) results.get(i);

System.out.println(" id: " + gb.getId() + " ,name: " + gb.getName());

}

} catch (SQLException e) {

e.printStackTrace();

} finally {

DbUtils.closeQuietly(conn);

}

}

}

Guestbook.java

Code

package com.sy;

public class Guestbook {

private Integer id;

private String name;

public Integer getId() {

return id;

}

public void setId(Integer id) {

this .id = id;

}

public String getName() {

return name;

}

public void setName(String name) {

this .name = name;

}

}

MapListExample.java

Code

package com.sy;

import org.apache.commons.dbutils.DbUtils;

import org.apache.commons.dbutils.QueryRunner;

import org.apache.commons.dbutils.handlers.MapListHandler;

import java.sql.Connection;

import java.sql.DriverManager;

import java.sql.SQLException;

import java.util.List;

import java.util.Map;

public class MapListExample {

public static void main(String[] args) {

Connection conn = null ;

String url = " jdbc:mysql://localhost:3306/people" ;

String jdbcDriver = " com.mysql.jdbc.Driver" ;

String user = " root " ;

String password = " hicc " ;

DbUtils.loadDriver(jdbcDriver);

try {

conn = DriverManager.getConnection(url, user, password);

QueryRunner qr = new QueryRunner();

List results = (List) qr.query(conn, " select id,name from guestmessage" , new MapListHandler());

for ( int i = 0 ; i < results.size(); i++ ) {

Map map = (Map) results.get(i);

System.out.println(" id: " + map.get( " id " ) + " ,name: " + map.get( " name " ));

}

} catch (SQLException e) {

e.printStackTrace();

} finally {

DbUtils.closeQuietly(conn);

}

}

}

使用組建好需要添加commons - dbutils - 1.1 .jar和mysql - connector - java - 5.1 . 6 - bin.jar 兩個jar包。

配置完畢！！！

// 另一種方法

// 使用dbutils1.0版本

import java.util. * ;

import java.util.logging.* ;

import java.sql.* ;

import org.apache.commons.dbutils.* ;

import org.apache.commons.dbutils.handlers.* ;

public class TestDBUnits {

public static void main(String[]args) throws Exception {

TestDBUnits test = new TestDBUnits();

for ( int i = 0 ; i < 1 ; i ++ ) {

test.testQuery1();

test.testQuery2();

test.testUpdate();

}

}

public void testQuery1(){

try {

QueryRunner qr = new QueryRunner() ;

ResultSetHandler rsh = new ArrayListHandler();

String strsql = " select * from test1" ;

ArrayList result = (ArrayList)qr.query(getConnection() ,strsql ,rsh);

// System.out.print("");

} catch (Exception ex) {

ex.printStackTrace(System.out);

}

}

public void testQuery2(){

try {

QueryRunner qr = new QueryRunner() ;

ResultSetHandler rsh = new MapListHandler();

String strsql = " select * from test1" ;

ArrayList result = (ArrayList)qr.query(getConnection() ,strsql ,rsh);

for ( int i = 0 ; i < result.size() ; i++ ) {

Map map = (Map)result.get(i);

// System.out.println(map);

}

// System.out.print("");

} catch (Exception ex) {

ex.printStackTrace(System.out);

}

}

public void testUpdate(){

try {

QueryRunner qr = new QueryRunner() ;

ResultSetHandler rsh = new ArrayListHandler();

String strsql = " insert test1(page ,writable ,content)values('ttt','ttt','faskldfjklasdjklfjasdklj')" ;

qr.update(getConnection() ,strsql);

// System.out.print("");

} catch (Exception ex) {

ex.printStackTrace(System.out);

}

}

private Connection getConnection() throws InstantiationException,

IllegalAccessException, ClassNotFoundException, SQLException {

String strDriver = " org.gjt.mm.mysql.Driver" ;

String strUrl = " jdbc:mysql://localhost:3306/test" ;

String strUser = " root " ;

String strPass = "" ;

Class.forName(strDriver).newInstance();

return DriverManager.getConnection(strUrl, strUser, strPass);

}

}

總結

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