常用结果集 scalarHandler,beanListHandler,BeanHander ,columnlistHandler,BeanMapHandler,ArrayHandler

package com.oracle.dao;

import com.oracle.dbutile.DbUtils;

import com.oracle.entity.Muser;
import org.apache.commons.dbutils.QueryRunner;
import org.apache.commons.dbutils.handlers.*;
import org.junit.Before;
import org.junit.Test;

import java.sql.Connection;
import java.sql.SQLException;
import java.util.Iterator;
import java.util.List;
import java.util.Map;
import java.util.Set;

public class DbDao {

private QueryRunner queryRunner;
private  Connection conn;
@Before
//单元测试 两个注解 before 和 after   每一个测试方法 先执行Before 自己的方法 @after的代码
public  void before(){
queryRunner=new QueryRunner();
conn= DbUtils.getConn();

}
//ScalarHandler<Long>
@Test
public  void jdbc(){

String sql="insert into muser values(null,?,?,?,?,?,?)";
try {

long pk= queryRunner.insert(conn,sql,new ScalarHandler<Long>(),"admin","123456",1,11,"188888","10089");
//int count=queryRunner.update(conn,sql,"admin","111",1,23,"10086","helloworld");

System.out.println(pk);
} catch (SQLException e) {
e.printStackTrace();
}
finally {
DbUtils.closeConn(conn,null,null);
}

}

@Test
public void query()
{

try {
List<Muser> list= queryRunner.query(conn,"select * from  muser",new BeanListHandler<Muser>(Muser.class));
Iterator i=list.iterator();
while(i.hasNext())
{
System.out.println(i.next());
}

} catch (SQLException e) {
e.printStackTrace();
}
}

//注入@Testpublic void dsql(){QueryRunner queryRunner=new QueryRunner();Connection conn= DbUtils.getConn();String muname="admin";String mupwd="' or '1'='1";try {//select * from muser where muname='admin' and mupwd='' or '1'='1'Muser user = queryRunner.query(conn, "select * from muser where muname=? and mupwd=?", new BeanHandler<Muser>(Muser.class),muname,mupwd);System.out.println(user);}catch (Exception e){e.printStackTrace();}finally {DbUtils.closeConn(conn,null,null);}}//@Testpublic void querone(){try {Muser user=  queryRunner.query(conn,"select *from muser where muname=? and mupwd=?",new BeanHandler<Muser>(Muser.class),"admin","123456");if(user==null){System.out.println("登录失败");}else {System.out.println("登录成功");4000}} catch (SQLException e) {e.printStackTrace();}finally {DbUtils.closeConn(conn,null,null);}}@Testpublic void queryColumnList(){String sql="select muname from muser";try {List<String> unameList=queryRunner.query(conn,sql,new ColumnListHandler<String>());Iterator i=unameList.iterator();while (i.hasNext()){System.out.println(i.next());}} catch (SQLException e) {e.printStackTrace();}}

@Testpublic void beanMap(){try {Map<Integer,Muser> beanMap= queryRunner.query(conn,"select *from muser",new BeanMapHandler<Integer,Muser>(Muser.class));Set<Integer> keySet=beanMap.keySet();Iterator<Integer> i=keySet.iterator();while (i.hasNext()){int key=i.next();System.out.println(key);System.out.println(beanMap.get(key));}} catch (SQLException e) {e.printStackTrace();}}@Testpublic void queryArray(){String sql="select media.*,r.regionname from media as media left join region as r on media.regionid=r.regionid";try {Object[] objList=queryRunner.query(conn,sql,new ArrayHandler());for (Object column:objList){System.out.print(column);}} catch (SQLException e) {e.printStackTrace();}}@Testpublic void queryall(){try {List<Muser> list  =queryRunner.query(conn,"select *from muser",new BeanListHandler<Muser>(Muser.class));Iterator i= list.iterator();while (i.hasNext()){System.out.println(i.next());}} catch (SQLException e) {e.printStackTrace();}}}