SQLLite数据库操作

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();

        }

        

    }

    



}