Java Web CommonsUtils （数据库连接方法）

新建java project项目；

Build Path；

　　　　commons-dbutils-1.3.jar

　　　　数据库驱动类：Oracle: ojdbc6.jar                   MySQL: mysql-connector-java-5.1.7-bin.jar

MapListExample.java

代码：

package webbook.chapter5;

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:oracle:thin:@192.168.1.20:1521:ora9";
  String jdbcDriver = "oracle.jdbc.driver.OracleDriver";
  String user = "scott";
  String password = "tiger";

  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 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);
  }
 }
}

在Hibernate中这个类叫做POJO类，

当然他可以使用映射文件“Guestbook.hbm.xml”或者annotation

 

Guestbook.java

代码：

package webbook.chapter5;

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;
 }
}

BeanListExample.java

代码：

package webbook.chapter5;

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:oracle:thin:@10.5.116.112:1521:ora9";
  String jdbcDriver = "oracle.jdbc.driver.OracleDriver";
  String user = "scott";
  String password = "tiger";

　String sql="select id,name from guestbook";

  DbUtils.loadDriver(jdbcDriver);
  try {
   conn = DriverManager.getConnection(url, user, password);
   QueryRunner qr = new QueryRunner();
   List results = (List) qr.query(conn, sql,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);
  }
 }
}