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SQLLite数据库操作

时间:2014-09-11 19:20:12      阅读:411      评论:0      收藏:0      [点我收藏+]

标签:android   io   os   使用   java   ar   for   文件   数据   

DBOpenHelper.java

package com.example.sqllite.servise;

 

import android.content.Context;

import android.database.sqlite.SQLiteDatabase;

import android.database.sqlite.SQLiteDatabase.CursorFactory;

import android.database.sqlite.SQLiteOpenHelper;

/**

 * 数据库操作底层组件

 * @author 37度爱你

 *

 */

public class DBOpenHelp extends SQLiteOpenHelper {

 

 

 

public DBOpenHelp(Context context) {

super(context, "person.db", null, 3);

// TODO Auto-generated constructor stub

}

 

 

@Override

public void onCreate(SQLiteDatabase db) {

//数据库第一次被创建的时候调用

//生成数据库表

String sql = "CREATE  TABLE person(id INTEGER PRIMARY KEY , name VARCHAR, age INTEGER,phone VARCHAR)";

db.execSQL(sql);

}

 

@Override

public void onUpgrade(SQLiteDatabase db, int oldVersion, int newVersion) {

// 数据库文件版本号发生变更的时候调用

//软件升级的时候

db.execSQL("ALTER TABLE person ADD amount VARCHAR");

}

 

}


personServise.java

package com.example.sqllite.servise;

 

import java.util.ArrayList;

import java.util.List;

 

import android.content.ContentValues;

import android.content.Context;

import android.database.Cursor;

import android.database.sqlite.SQLiteDatabase;

 

import com.example.sqllite.domain.Person;

/**

 * 数据库业务帮助类

 * @author 37度爱你

 *

 */

public class personServise {

 

private DBOpenHelp dbOpenHelp;

 

public personServise(Context context){

this.dbOpenHelp=new DBOpenHelp(context);

}

/**

 * 保存

 * @param person

 */

public void save(Person person){

SQLiteDatabase db=dbOpenHelp.getWritableDatabase();

//db.execSQL("INSERT INTO person(name,age) VALUES(?,?)",new Object[]{person.getName(),person.getAge()});;

//db.execSQL("INSERT INTO person(name,age) VALUES(‘zzz‘,23)");

ContentValues contentValues=new ContentValues();

contentValues.put("name", person.getName());

contentValues.put("age", person.getAge());

contentValues.put("amount", person.getAmount());

db.insert("person", null, contentValues);

 

db.close();

}

/**

 * 删除

 * @param id

 */

public void delete(int id){

SQLiteDatabase db=dbOpenHelp.getWritableDatabase();

//db.execSQL("delete from person where personID=?",new Object[]{id});;

db.delete("person", "id=?", new String[]{String.valueOf(id)});

db.close();

}

/**

 * 更新操作

 * @param person

 */

public void update(Person person){

SQLiteDatabase db=dbOpenHelp.getWritableDatabase();

//db.execSQL("update person set name=?,age=? where personID=?",new Object[]{person.getName(),person.getAge(),person.getPersonID()});;

ContentValues contentValues=new ContentValues();

contentValues.put("name", person.getName());

contentValues.put("age", person.getAge());

contentValues.put("amount", person.getAmount());

db.update("person", contentValues, "id=?", new String[]{String.valueOf(person.getPersonID())});

db.close();

}

/**

 * 查找第一条记录

 * @param id

 * @return

 */

public Person find(int id){

SQLiteDatabase db=dbOpenHelp.getWritableDatabase();

//Cursor cursor=db.rawQuery("select * from person where personID=?", new String[]{String.valueOf(id)});

Cursor cursor=db.query("person", null, "id=?", new String[]{String.valueOf(id)}, null, null, null);

if(cursor.moveToFirst()){

int personID=cursor.getInt(cursor.getColumnIndex("id"));

String name=cursor.getString(cursor.getColumnIndex("name"));

int age=cursor.getInt(cursor.getColumnIndex("age"));

String amount=cursor.getString(cursor.getColumnIndex("amount"));

Person person=new Person(personID, name, age,amount);

cursor.close();

db.close();

return person;

}else{

db.close();

return null;

}

 

}

/**

 * 分页获取数据

 * 返回list

 * @return

 */

public List<Person> getListByPage(){

SQLiteDatabase db=dbOpenHelp.getWritableDatabase();

List<Person> persons=new ArrayList<Person>();

Cursor cursor=db.query("person", null, null, null, null, null, null,"0,5");

if(cursor.moveToFirst()){

int personID=cursor.getInt(cursor.getColumnIndex("id"));

String name=cursor.getString(cursor.getColumnIndex("name"));

int age=cursor.getInt(cursor.getColumnIndex("age"));

String amount=cursor.getString(cursor.getColumnIndex("amount"));

Person person=new Person(personID, name, age,amount);

persons.add(person);

while(cursor.moveToNext()){

int ID=cursor.getInt(cursor.getColumnIndex("id"));

String name1=cursor.getString(cursor.getColumnIndex("name"));

int age1=cursor.getInt(cursor.getColumnIndex("age"));

String amount1=cursor.getString(cursor.getColumnIndex("amount"));

Person person1=new Person(ID, name1, age1,amount1);

persons.add(person1);

}

cursor.close();

db.close();

return persons;

}else{

db.close();

return null;

}

}

/**

 * 分页获取数据

 * 返回cursor

 * @return

 */

public Cursor getListByPage2(){

SQLiteDatabase db=dbOpenHelp.getWritableDatabase();

List<Person> persons=new ArrayList<Person>();

Cursor cursor=db.rawQuery("select id as _id,name,age,amount from person limit 0,5", null);

return cursor;

}

/**

 * 事务的使用

 */

public void translate(){

SQLiteDatabase db=dbOpenHelp.getWritableDatabase();

db.beginTransaction();//开始事务

try{

db.execSQL("update person set amount=amount+10 where id=1");

db.execSQL("update person set amount=amount-10 where id=2");

//设置事务成功标志

db.setTransactionSuccessful();

}finally{

db.endTransaction();

//结束事务有两种 commit callback

//根据事务标志决定

}

}

}


personAdapter.java

package com.example.sqllite.servise;

 

import java.util.List;

 

import com.example.sqllite.R;

import com.example.sqllite.domain.Person;

 

import android.content.Context;

import android.view.LayoutInflater;

import android.view.View;

import android.view.ViewGroup;

import android.widget.BaseAdapter;

import android.widget.TextView;

 

public class personAdapter extends BaseAdapter {

 

/**

 * 自定义适配器

 */

private List<Person> persons;

private int resources;

//界面生成器  负责将xml文件生成view对象

private LayoutInflater inflater;

 

public personAdapter(Context context,List<Person> persons,int resources){

this.persons=persons;

this.resources=resources;

//界面生成器由程序上下文获得的系统服务

inflater=(LayoutInflater) context.getSystemService(Context.LAYOUT_INFLATER_SERVICE);

 

}

@Override

public int getCount() {

 

return persons.size();

}

 

@Override

public Object getItem(int position) {

return persons.get(position);

}

 

@Override

public long getItemId(int position) {

 

return position;

}

 

@Override

public View getView(int position, View convertView, ViewGroup parent) {

//如果为空说明展示的是第一页,否则将从第一页的缓存中获取其他页面

if(convertView==null){

convertView=inflater.inflate(resources, null);

}

TextView id=(TextView) convertView.findViewById(R.id.id);

TextView name=(TextView) convertView.findViewById(R.id.name);

TextView age=(TextView) convertView.findViewById(R.id.age);

TextView amount=(TextView) convertView.findViewById(R.id.amount);

 

Person person=persons.get(position);

name.setText(person.getName());

id.setText(String.valueOf(person.getPersonID()));

age.setText(String.valueOf(person.getAge()));

amount.setText(person.getAmount());

return convertView;

}

 

}


mainActivity.java

package com.example.sqllite;

 

import java.util.ArrayList;

import java.util.HashMap;

import java.util.List;

 

import com.example.sqllite.domain.Person;

import com.example.sqllite.servise.DBOpenHelp;

 

 

 

import com.example.sqllite.servise.personAdapter;

import com.example.sqllite.servise.personServise;

 

import android.app.Activity;

import android.database.Cursor;

import android.os.Bundle;

import android.util.Log;

import android.view.Menu;

import android.view.View;

 

 

import android.widget.AdapterView;

import android.widget.ListView;

import android.widget.SimpleAdapter;

import android.widget.SimpleCursorAdapter;

import android.widget.Toast;

 

public class MainActivity extends Activity {

 

private ListView listView;

@Override

protected void onCreate(Bundle savedInstanceState) {

super.onCreate(savedInstanceState);

setContentView(R.layout.activity_main);

listView=(ListView) findViewById(R.id.listView);

 

listView.setOnItemClickListener(new OnItemClickListener());

show2();//数据绑定

 

/*DBOpenHelp dbOpenHelp=new DBOpenHelp(getApplicationContext());

dbOpenHelp.getWritableDatabase();

Person person1=new Person();

Person person2=new Person();

List<Person> persons=new ArrayList<Person>();

personServise personServise=new personServise(getApplicationContext());

personServise.update(new Person(1, "miaoshaung", 22, "60"));

personServise.save(new Person(4, "asasdfd", 3243234, "70"));

personServise.translate();

person1=personServise.find(1);

person2=personServise.find(2);

persons=personServise.getListByPage();

for(Person person:persons){

Log.i("TAG", person.toString());

}

Toast.makeText(getApplicationContext(), person1.getAmount().toString()+"--"+ person2.getAmount().toString(), 1).show();

*/}

 

private void show() {

personServise personServise=new personServise(getApplicationContext());

List<Person> persons = personServise.getListByPage();

List<HashMap<String, Object>> data=new ArrayList<HashMap<String,Object>>();

for(Person person:persons){

HashMap<String, Object> iteMap=new HashMap<String, Object>();

iteMap.put("id", person.getPersonID());

iteMap.put("name", person.getName());

iteMap.put("age", person.getAge());

iteMap.put("amount", person.getAmount());

data.add(iteMap);

}

SimpleAdapter adapter=new SimpleAdapter(getApplicationContext(), data, R.layout.item, 

new String[]{"id","name","age","amount"}, new int[]{R.id.id,R.id.name,R.id.age,R.id.amount});

listView.setAdapter(adapter);

}

private void show2(){

personServise personServise=new personServise(getApplicationContext());

List<Person> persons = personServise.getListByPage();

personAdapter adapter=new personAdapter(getApplicationContext(), persons, R.layout.item);

listView.setAdapter(adapter);

}

private void show3(){

personServise personServise=new personServise(getApplicationContext());

Cursor cursor=personServise.getListByPage2();

SimpleCursorAdapter adapter=new SimpleCursorAdapter(getApplicationContext(), R.layout.item, cursor, new String[]{"_id","name","age","amount"}, new int[]{R.id.id,R.id.name,R.id.age,R.id.amount});

listView.setAdapter(adapter);

}

 

/**

 * 条目点击事件

 * @author 37度爱你

 *

 */

public class OnItemClickListener implements android.widget.AdapterView.OnItemClickListener{

@Override

public void onItemClick(AdapterView<?> arg0, View arg1, int arg2,

long arg3) {

ListView listView2=(ListView) arg0;

Person person=(Person) listView2.getItemAtPosition(arg2);

Toast.makeText(getApplicationContext(), person.toString(), 1).show();

}

 

}

 

 

}

 

SQLLite数据库操作

标签:android   io   os   使用   java   ar   for   文件   数据   

原文地址:http://www.cnblogs.com/zhangjie9142/p/3967052.html

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