遇到的问题:一个条件查询与多个条件查询,所用到的方式不一样
参考文档: http://www.oschina.net/question/1160609_133366
mybatis多条件查询的一个错误
解决方案如下:
利用序列号的方式解决多个参数的查询问题。对象与数据库关系的映射层。
层次结构如下:
首先定义model层里面的Userlist类,这是和我们后台mysql里面的表是一一对应的,然后定义UserlistMapper类,这个类主要是用来封装一些个方法,比如说增删改查等。其实现通过UserlistMapper.xml来实现,这个里面主要涉及一些sql语句。
做完上面这些以后,我们就需要和客户端交互,所以定义SrvUserlist类,主要与客户端进行交互。里面有dopost与doget等方法。当然先是响应service()的方法,然后根据客户端的请求,选择不同的方法进行响应。比如说,客户端请求的是post方法,那么服务器端就需要执行dopost方法与之对应。
dao层代码:(Data access object)包含的数据的所有操作。数据访问层:
package zhuxuekui.data;
import java.util.List;
import org.apache.ibatis.annotations.Param;
import zhuxuekui.model.Userlist;
public interface UserlistMapper {
Userlist selectUserlist(@Param("username")String username,@Param("passward")String passward);
}
.csharpcode, .csharpcode pre
{
font-size: small;
color: black;
font-family: consolas, "Courier New", courier, monospace;
background-color: #ffffff;
/*white-space: pre;*/
}
.csharpcode pre { margin: 0em; }
.csharpcode .rem { color: #008000; }
.csharpcode .kwrd { color: #0000ff; }
.csharpcode .str { color: #006080; }
.csharpcode .op { color: #0000c0; }
.csharpcode .preproc { color: #cc6633; }
.csharpcode .asp { background-color: #ffff00; }
.csharpcode .html { color: #800000; }
.csharpcode .attr { color: #ff0000; }
.csharpcode .alt
{
background-color: #f4f4f4;
width: 100%;
margin: 0em;
}
.csharpcode .lnum { color: #606060; }
参见这篇帖子:http://zhuyuehua.iteye.com/blog/1721715
配置文件:
<?xml version="1.0" encoding="UTF-8"?>
<!DOCTYPE mapper PUBLIC "-//mybatis.org//DTD Mapper 3.0//EN"
"http://mybatis.org/dtd/mybatis-3-mapper.dtd">
<mapper namespace="zhuxuekui.data.UserlistMapper">
<resultMap id="userResultMap" type="Userlist">
<result property="username" column="username"></result>
<result property="passward" column="passward"></result>
</resultMap>
<select id="selectUserlist" parameterType="Map"
resultMap="userResultMap">
select * from userlist
where username = #{username} and passward = #{passward}
</select>
</mapper>
.csharpcode, .csharpcode pre
{
font-size: small;
color: black;
font-family: consolas, "Courier New", courier, monospace;
background-color: #ffffff;
/*white-space: pre;*/
}
.csharpcode pre { margin: 0em; }
.csharpcode .rem { color: #008000; }
.csharpcode .kwrd { color: #0000ff; }
.csharpcode .str { color: #006080; }
.csharpcode .op { color: #0000c0; }
.csharpcode .preproc { color: #cc6633; }
.csharpcode .asp { background-color: #ffff00; }
.csharpcode .html { color: #800000; }
.csharpcode .attr { color: #ff0000; }
.csharpcode .alt
{
background-color: #f4f4f4;
width: 100%;
margin: 0em;
}
.csharpcode .lnum { color: #606060; }
Model层:
package zhuxuekui.model;
public class Userlist {
public String username;
public String passward;
}
.csharpcode, .csharpcode pre
{
font-size: small;
color: black;
font-family: consolas, "Courier New", courier, monospace;
background-color: #ffffff;
/*white-space: pre;*/
}
.csharpcode pre { margin: 0em; }
.csharpcode .rem { color: #008000; }
.csharpcode .kwrd { color: #0000ff; }
.csharpcode .str { color: #006080; }
.csharpcode .op { color: #0000c0; }
.csharpcode .preproc { color: #cc6633; }
.csharpcode .asp { background-color: #ffff00; }
.csharpcode .html { color: #800000; }
.csharpcode .attr { color: #ff0000; }
.csharpcode .alt
{
background-color: #f4f4f4;
width: 100%;
margin: 0em;
}
.csharpcode .lnum { color: #606060; }
Service层:
package zhuxuekui.service;
import java.io.IOException;
import java.util.List;
import javax.servlet.ServletException;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import org.apache.ibatis.builder.annotation.MapperAnnotationBuilder;
import org.apache.ibatis.session.SqlSession;
import zhuxuekui.data.UserlistMapper;
import zhuxuekui.model.Userlist;
public class SrvUserlist extends HttpServlet {
private static final long serialVersionUID = 1L;
@Override
protected void service(HttpServletRequest req, HttpServletResponse res)
throws ServletException, IOException {
res.getWriter().println("Hello World||||!");
super.service(req, res);
}
@Override
protected void doGet(HttpServletRequest req, HttpServletResponse res)
throws ServletException, IOException {
// String resource = "/com/arthur/data/Configuration.xml";
// Reader reader;
// try {
// reader = Resources.getResourceAsReader(resource);
// Constants.SQL_FACTORY = new SqlSessionFactoryBuilder()
// .build(reader);
// } catch (Exception e) {
// e.printStackTrace();
// e.printStackTrace(res.getWriter());
// }
String username = req.getParameter("username");
String passward = req.getParameter("passward");
//
// System.out.println("账号: "+username);
// System.out.println("密码:"+passward);
SqlSession session = Constants.SQLFactory().openSession();
//UserlistMapper userMapper =session.getMapper(UserlistMapper.class);
// Userlist userlist = userMapper.selectUserlist(username);
//加载映射 ,与 userlistMapper挂钩 ,就是一条sql语句
UserlistMapper mapper = session.getMapper(UserlistMapper.class);
//从数据库当中选择一条对的语句,进行比对。返回一条记录
Userlist userlist = mapper.selectUserlist(username,passward);
if (userlist !=null) {
//res.getWriter().println("there is no user with name" + username);
String json = Constants.GSON.toJson(userlist);
res.getWriter().println(json);
}
else {
res.getWriter().println("there is new reader with name" + username);
}
}
@Override
protected void doPost(HttpServletRequest req, HttpServletResponse resp)
throws ServletException, IOException {
this.doGet(req, resp);
//String userName = req.getParameter("username");
String username = req.getParameter("username");
String passward = req.getParameter("passward");
System.out.println("账号: "+username);
System.out.println("密码:"+passward);
SqlSession session = Constants.SQLFactory().openSession();
UserlistMapper mapper = session.getMapper(UserlistMapper.class);
Userlist userlist = mapper.selectUserlist(username,passward);
if (userlist != null) {
resp.setStatus(200);
} else {
resp.sendError(345, "用户名密码不正确!");
}
}
}
.csharpcode, .csharpcode pre
{
font-size: small;
color: black;
font-family: consolas, "Courier New", courier, monospace;
background-color: #ffffff;
/*white-space: pre;*/
}
.csharpcode pre { margin: 0em; }
.csharpcode .rem { color: #008000; }
.csharpcode .kwrd { color: #0000ff; }
.csharpcode .str { color: #006080; }
.csharpcode .op { color: #0000c0; }
.csharpcode .preproc { color: #cc6633; }
.csharpcode .asp { background-color: #ffff00; }
.csharpcode .html { color: #800000; }
.csharpcode .attr { color: #ff0000; }
.csharpcode .alt
{
background-color: #f4f4f4;
width: 100%;
margin: 0em;
}
.csharpcode .lnum { color: #606060; }
服务器端调试界面:
客户端代码:
package com.buu.play.aa;
import org.apache.http.Header;
import android.app.Activity;
import android.content.Intent;
import android.os.Bundle;
import android.util.Log;
import android.view.View;
import android.view.View.OnClickListener;
import android.widget.Button;
import android.widget.EditText;
import android.widget.LinearLayout;
import android.widget.LinearLayout.LayoutParams;
import android.widget.Toast;
import com.buu.play.BMapApiDemoMain;
import com.buu.play.DemoApplication;
import com.loopj.android.http.AsyncHttpClient;
import com.loopj.android.http.BaseJsonHttpResponseHandler;
import com.loopj.android.http.RequestParams;
public class LoginActivity extends Activity implements OnClickListener {
static final String TAG = "ahttp";
private EditText etName, etPsw;
private Button btnLogin;
AsyncHttpClient httpClient;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
httpClient = DemoApplication.instance().asyncHttpClient;
LinearLayout ll = new LinearLayout(this);
ll.setOrientation(LinearLayout.VERTICAL);
ll.setPadding(25, 25, 25, 25);
setContentView(ll);
etName = new EditText(this);
etName.setHint("用户名");
ll.addView(etName, LayoutParams.MATCH_PARENT, LayoutParams.WRAP_CONTENT);
etPsw = new EditText(this);
etPsw.setHint("密码");
ll.addView(etPsw, LayoutParams.MATCH_PARENT, LayoutParams.WRAP_CONTENT);
btnLogin = new Button(this);
btnLogin.setText("登 录");
btnLogin.setOnClickListener(this);
ll.addView(btnLogin, LayoutParams.MATCH_PARENT,
LayoutParams.WRAP_CONTENT);
}
@Override
public void onClick(View v) {
// Intent intent = new Intent(LoginActivity.this,
// BMapApiDemoMain.class);
// LoginActivity.this.startActivity(intent);
if (!isValid()) {
Toast.makeText(LoginActivity.this, "用户名密码没有填写", Toast.LENGTH_LONG)
.show();
// 用户名密码没有填写
return;
}
//
// TODO do request
RequestParams param = new RequestParams();
param.put("username", etName.getText().toString());
param.put("passward", etPsw.getText().toString());
httpClient.post("http://192.168.1.106:8080/login", param,
new BaseJsonHttpResponseHandler<Object>() {
@Override
public void onSuccess(int statusCode, Header[] headers,
String rawJsonResponse, Object response) {
Log.d(TAG, rawJsonResponse);
Intent intent = new Intent(LoginActivity.this,
BMapApiDemoMain.class);
LoginActivity.this.startActivity(intent);
finish();
}
@Override
public void onFailure(int statusCode, Header[] headers,
Throwable throwable, String rawJsonData,
Object errorResponse) {
// Intent intent = new Intent(LoginActivity.this,
// BMapApiDemoMain.class);
// LoginActivity.this.startActivity(intent);
// finish();
Toast.makeText(LoginActivity.this, "用户名密码错误",
Toast.LENGTH_LONG).show();
}
@Override
protected Object parseResponse(String rawJsonData,
boolean isFailure) throws Throwable {
Log.d(TAG, rawJsonData);
return rawJsonData;
}
});
}
private boolean isValid() {
return etName.getText().length() > 0 && etPsw.getText().length() > 0;
}
}
.csharpcode, .csharpcode pre
{
font-size: small;
color: black;
font-family: consolas, "Courier New", courier, monospace;
background-color: #ffffff;
/*white-space: pre;*/
}
.csharpcode pre { margin: 0em; }
.csharpcode .rem { color: #008000; }
.csharpcode .kwrd { color: #0000ff; }
.csharpcode .str { color: #006080; }
.csharpcode .op { color: #0000c0; }
.csharpcode .preproc { color: #cc6633; }
.csharpcode .asp { background-color: #ffff00; }
.csharpcode .html { color: #800000; }
.csharpcode .attr { color: #ff0000; }
.csharpcode .alt
{
background-color: #f4f4f4;
width: 100%;
margin: 0em;
}
.csharpcode .lnum { color: #606060; }
改进:1)客户端:没有做注册,只做了一个登陆。后期可能需要优化。
2)服务器端:只尝试了序列号的方法,后期尝试hashmap方法。
android客户端向服务器端验证登陆方法的实现1,布布扣,bubuko.com