Apache DbUtils详解
1，连接类ConnectDbimport java.sql.SQLException;
import java.sql.Connection;
public class ConnectDb {
private static String driveClassName = "com.mysql.jdbc.Driver";
private static String url = "jdbc:mysql://192.168.1.161:3306/test?useUnicode=true&characterEncoding=utf8";
private static String user = "root";
private static String password = "e-playnow";
public static Connection Connect(){
Connection conn = null;
//load driver
try {
Class.forName(driveClassName);
} catch (ClassNotFoundExceptione) {
System.out.println("load driver failed!");
e.printStackTrace();
}
//connect db
try {
conn = DriverManager.getConnection(url, user, password);
} catch (SQLException e) {
System.out.println("connect failed!");
e.printStackTrace();
}
return conn;
}
}
数据库表：
CREATE TABLE `user` (
`id` int(11) NOT NULL auto_increment,
`name` varchar(50) NOT NULL,
`age` tinyint(10) NOT NULL,
PRIMARY KEY(`id`)
) ENGINE=MyISAM AUTO_INCREMENT=4 DEFAULT CHARSET=utf8
Bean：
package Beans;
public class UserBean {
private int id;
private String name;
private int age;
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 int getAge() {
return age;
}
public void setAge(int age) {
this.age = age;
}
}
Demo：
import java.sql.Connection;
import java.sql.SQLException;
import java.util.List;
import org.apache.commons.dbutils.DbUtils;
import org.apache.commons.dbutils.QueryRunner;
import org.apache.commons.dbutils.handlers.BeanListHandler;
import Beans.UserBean;
public class main {
public static void main(String[] args) throws SQLException {
insert_test();
del_test();
}
static void insert_test() throws SQLException{
Connection conn = ConnectDb.Connect();
//创建SQL执行工具
QueryRunner qRunner = new QueryRunner();
//执行SQL插入
int n = qRunner.update(conn, "insert into user(name,age) values('xxx',22)");
System.out.println("成功插入" + n + "条数据！");
//关闭数据库连接
DbUtils.closeQuietly(conn);
}
static void select_test() throws SQLException{
Connection conn = ConnectDb.Connect();
//创建SQL执行工具
QueryRunner qRunner = new QueryRunner();
@SuppressWarnings("unchecked")
List<UserBean> list = (List<UserBean>) qRunner.query(conn, "select id,name,age from user", new BeanListHandler(UserBean.class));
//输出查询结果
for (UserBean user : list) {
System.out.println(user.getAge());
}
//关闭数据库连接
DbUtils.closeQuietly(conn);
}
static void update_test() throws SQLException{
Connection conn = ConnectDb.Connect();
//创建SQL执行工具
QueryRunner qRunner = new QueryRunner();
//执行SQL插入
int n = qRunner.update(conn, "update user set name = 'xxx',age=28");
System.out.println("成功更新" + n + "条数据！");
//关闭数据库连接
DbUtils.closeQuietly(conn);
}
static void del_test() throws SQLException{
Connection conn = ConnectDb.Connect();
//创建SQL执行工具
QueryRunner qRunner = new QueryRunner();
//执行SQL插入
int n = qRunner.update(conn, "DELETE from user WHERE name='xxx';");
System.out.println("删除成功" + n + "条数据！");
//关闭数据库连接
DbUtils.closeQuietly(conn);
}
}
补充个map的例子：
static void map_query(){
Connection conn = ConnectDb.Connect();
try {
QueryRunner qr = new QueryRunner() ;
ResultSetHandler rsh = new MapListHandler();
String strsql = "select * from user";
ArrayList result = (ArrayList)qr.query(conn ,strsql ,rsh);
for(int i = 0 ; i < result.size() ; i++) {
Map map = (Map)result.get(i);
}
} catch(Exception ex) {
ex.printStackTrace(System.out);
}
}
转自【http://blog.csdn.net/luxiaoyu_sdc/article/details/7361714】
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