xutils数据库的使用

‘壹’ android数据库存储，代码创建数据库、表，实现编辑框内输入，点击按钮提交进行存入；从数据库中提

常量类：ConstantUtil

java">publicclassConstantUtil{

	//数据库名称
	_NAME="user_manager.db";
	//数据库版本号
	publicstaticfinalintDATABASE_VERSION=1;
	
	//表名
	publicstaticfinalStringTABLE_NAME="user_info";
	//字段名
	publicstaticfinalStringUSER_ID="userId";
	publicstaticfinalStringUSER_NAME="username";
	publicstaticfinalStringUSER_PASSWORD="password";
	publicstaticfinalStringUSER_ADDRESS="address";

	

}

自定义sqliteOpenHelper：MySQLiteOpenHelper

{

	//定义一个SQLiteDatabase对象，对表进行相应的操作
	;

	publicMySQLiteOpenHelper(Contextcontext){
		super(context,ConstantUtil.DATABASE_NAME,null,
				ConstantUtil.DATABASE_VERSION);
		mDatabase=getWritableDatabase();
	}

	/*
	*创建表
	*/
	@Override
	publicvoidonCreate(SQLiteDatabasedb){
		//TODOAuto-generatedmethodstub
		
		//sql语句
		Stringsql="createtable"+ConstantUtil.TABLE_NAME+"("
				+ConstantUtil.USER_ID+"integerprimarykey,"
				+ConstantUtil.USER_NAME+"textnotnull,"
				+ConstantUtil.USER_PASSWORD+"textnotnull,"
				+ConstantUtil.USER_ADDRESS+"textnotnull)";
		db.execSQL(sql);
	}

	@Override
	publicvoidonUpgrade(SQLiteDatabasedb,intoldVersion,intnewVersion){
		//TODOAuto-generatedmethodstub
		onCreate(db);
	}
	
	/**
	*添加数据
	*@paramcv
	*@return
	*/
	publicbooleaninsertData(ContentValuescv){
		returnmDatabase.insert(ConstantUtil.TABLE_NAME,null,cv)>0;
	}
	
	/**
	*查询所有数据
	*@return
	*/
	publicList<Userinfo>queryData(){
		
		List<Userinfo>userinfos=newArrayList<Userinfo>();
		//从数据库里查询数据
		Cursorcursor=mDatabase.query(ConstantUtil.TABLE_NAME,null,null,null,null,null,null);
		
		if(cursor!=null){
			//取出数据
			while(cursor.moveToNext()){
				Userinfouserinfo=newUserinfo();
				userinfo.setUserId(cursor.getInt(0));
				userinfo.setUsername(cursor.getString(1));
				userinfo.setPassword(cursor.getString(2));
				userinfo.setAddress(cursor.getString(3));
				userinfos.add(userinfo);
			}
			
		}
		returnuserinfos;
		
	}

}

主Activity

{
	//控件
	privateTextViewtxtName,txtPwd,txtAddress;
	privateEditTextedtName,edtPwd,edtAddress;
	privateListViewmListView;
	//数据库对象
	;
	
	privateUserinfoAdapteradapter;
	/**.*/
	@Override
	publicvoidonCreate(BundlesavedInstanceState){
		super.onCreate(savedInstanceState);
		setContentView(R.layout.main);

		findView();
		init();
	}

	privatevoidfindView(){
		//TODOAuto-generatedmethodstub
		
		edtName=(EditText)findViewById(R.id.id_edit1);
		edtPwd=(EditText)findViewById(R.id.id_edit2);
		edtAddress=(EditText)findViewById(R.id.id_edit3);
		mListView=(ListView)findViewById(R.id.id_listview);

	}

	privatevoidinit(){
		//TODOAuto-generatedmethodstub
		mySQLiteOpenHelper=newMySQLiteOpenHelper(MainActivity.this);
	}

	publicvoidonAction(Viewv){

		switch(v.getId()){
		caseR.id.id_btn_add:
			//添加数据
			StringuserName=edtName.getText().toString();
			StringuserPwd=edtPwd.getText().toString();
			StringuserAdress=edtAddress.getText().toString();
			//传入参数
			ContentValuescv=newContentValues();
			//列名和值
			cv.put(ConstantUtil.USER_NAME,userName);
			cv.put(ConstantUtil.USER_PASSWORD,userPwd);
			cv.put(ConstantUtil.USER_ADDRESS,userAdress);
			//得到结果
			booleanflag=mySQLiteOpenHelper.insertData(cv);
			
			if(flag){

				Toast.makeText(MainActivity.this,"添加记录成功",Toast.LENGTH_SHORT).show();
				
			}else{

				Toast.makeText(MainActivity.this,"添加记录失败",Toast.LENGTH_SHORT).show();
			}

			break;
		caseR.id.id_btn_query:
			//查询数据
			List<Userinfo>userinfos=mySQLiteOpenHelper.queryData();
			if(adapter!=null){
				adapter=null;
			}
			adapter=newUserinfoAdapter(userinfos);
			mListView.setAdapter(adapter);
			
			break;
		default:
			break;
		}

	}
	
	//数据适配器
	{

		List<Userinfo>userinfos;
		publicUserinfoAdapter(List<Userinfo>_userinfos){
			this.userinfos=_userinfos;
		}
		
		@Override
		publicintgetCount(){
			//TODOAuto-generatedmethodstub
			returnuserinfos.size();
		}

		@Override
		publicObjectgetItem(intposition){
			//TODOAuto-generatedmethodstub
			returnuserinfos.get(position);
		}

		@Override
		publiclonggetItemId(intposition){
			//TODOAuto-generatedmethodstub
			returnposition;
		}

		@Override
		publicViewgetView(intposition,ViewconvertView,ViewGroupparent){
			//TODOAuto-generatedmethodstub
			if(convertView==null){
				convertView=LayoutInflater.from(MainActivity.this).inflate(R.layout.listview_item,null);
				
				txtName=(TextView)convertView.findViewById(R.id.id_txt_name);
				txtPwd=(TextView)convertView.findViewById(R.id.id_txt_pwd);
				txtAddress=(TextView)convertView.findViewById(R.id.id_txt_address);
				
				txtName.setText(userinfos.get(position).getUsername());
				txtPwd.setText(userinfos.get(position).getPassword());
				txtAddress.setText(userinfos.get(position).getAddress());
			}
			
			
			returnconvertView;
		}
		
	}
}

完整源码下载地址（附数据库文件查询软件+运行效果图）：