SQLite和ListView的使用 并实现分页

http://www.androidla.net/index.php/2011/05/01/sqlite-listview-page/

 

这个小程序是在 Android2.3.3平台上写的，涉及SQLite和ListView的结合使用，以及实现了分页的效果。
先看看最终效果：

 

androidla分页

 

androidla分页

 

androidla分页

 

程序中主要的Java类：

DBHelper.java 数据库帮助类

package net.androidla.db;

import android.content.Context;
import android.database.sqlite.SQLiteDatabase;
import android.database.sqlite.SQLiteDatabase.CursorFactory;
import android.database.sqlite.SQLiteOpenHelper;

public class DBHelper extends SQLiteOpenHelper {

    public DBHelper(Context context, String name, CursorFactory factory, int version) {
        super (context, name, factory, version);
    }

    public DBHelper(Context context, String name, int version) {
        this (context, name, null , version);
    }

    @Override
    public void onCreate(SQLiteDatabase sld) {
        sld.execSQL( "create table person(id integer primary key autoincrement, name varchar(20), age integer)" );
        System.out.println( "database create ..." );
    }

    @Override
    public void onUpgrade(SQLiteDatabase sld, int arg1, int arg2) {
        sld.execSQL( "drop table if exists person" );
        System.out.println( "database upgrade ..." );
        onCreate(sld);
    }

}

PersonService.java 业务逻辑实现类

package net.androidla.service;

import java.util.ArrayList;
import java.util.List;

import net.androidla.db.DBHelper;
import net.androidla.vo.Person;
import android.content.Context;
import android.database.Cursor;
import android.database.sqlite.SQLiteDatabase;
import android.database.sqlite.SQLiteDatabase.CursorFactory;

public class PersonService {
    private static DBHelper db;
    public PersonService(Context context, String name, CursorFactory factory, int version) {
        db = new DBHelper(context, name, factory, version);
    }

    public void saveTransaction() {
        SQLiteDatabase data = db.getWritableDatabase();
        data.beginTransaction();
        try {
            data.execSQL( "insert into person(name, age) values(?,?)" , new Object[]{ "john" , ( short ) 20 });
            data.execSQL( "insert into person(name, age) values(?,?)" , new Object[]{ "smith" , ( short ) 30 });
            data.setTransactionSuccessful();
        } catch (Exception e) {
            System.out.println( "error..." );
        }
        data.endTransaction();
    }

    public void save(Person person) {
        SQLiteDatabase data = db.getWritableDatabase();
        data.execSQL( "insert into person(name, age) values(?,?)" , new Object[]{person.getName(), person.getAge()});
    }

    @SuppressWarnings ( "unused" )
    public void delete(Integer ... ids) {
        if (ids.length > 0 ) {
            StringBuffer sb = new StringBuffer();
            for (Integer id : ids) {
                sb.append( "?" ).append( "," );
                sb.deleteCharAt(ids.length);
            }
            SQLiteDatabase data = db.getWritableDatabase();
            data.execSQL( "delete from person where id in(" + sb.toString() + ")" , (Object[])ids);
        }

    }

    public void update(Person person) {
        SQLiteDatabase data = db.getWritableDatabase();
        data.execSQL( "update person set name=?, age=? where id=?" , new Object[]{person.getName(), person.getAge(), person.getId()});
    }

    public Person find(Integer id) {
        SQLiteDatabase data = db.getReadableDatabase();
        Cursor cursor = data.rawQuery( "select * from person where id=?" ,  new String[]{String.valueOf(id)});
        if (cursor.moveToNext()) {
            return new Person(cursor.getInt( 0 ), cursor.getString( 1 ), cursor.getShort( 2 ));
        }
        return null ;
    }

    public static List<person> queryList( int startIndex, int endIndex) {
        List</person><person> persons = new ArrayList</person><person>();
        SQLiteDatabase data = db.getReadableDatabase();
        Cursor cursor = data.rawQuery( "select * from person limit ?,?" , new String[]{String.valueOf(startIndex), String.valueOf(endIndex)});
        while (cursor.moveToNext()) {
            persons.add( new Person(cursor.getInt( 0 ), cursor.getString( 1 ), cursor.getShort( 2 )));
        }
        return persons;
    }

    public static long getCount() {
        SQLiteDatabase data = db.getReadableDatabase();
        Cursor cursor = data.rawQuery( "select count(*) from person" , null );
        if (cursor.moveToNext()) {
            return cursor.getLong( 0 );
        }
        return 0 ;
    }

}

PersonServiceTest.java 测试类

package net.androidla.sqlite;

import java.util.List;

import net.androidla.service.PersonService;
import net.androidla.util.PageUtil;
import net.androidla.vo.Person;
import android.test.AndroidTestCase;
@SuppressWarnings ( "static-access" )
public class PersonServiceTest extends AndroidTestCase {

    public void testDataBaseUpgrade() {
        PersonService ps = new PersonService( this .getContext(), "androidla" , null , 2 );
        ps.saveTransaction();
    }

    public void testTransaction() {
        PersonService ps = new PersonService( this .getContext(), "androidla" , null , 1 );
        ps.saveTransaction();
    }

    public void testSave() {
        PersonService ps = new PersonService( this .getContext(), "androidla" , null , 1 );
        for ( int i = 0 ; i < 100 ; i ++) {
            ps.save( new Person( "androidla" + i, ( short ) 10 ));
        }
    }

    public void testUpdate() {
        PersonService ps = new PersonService( this .getContext(), "androidla" , null , 1 );
        ps.update( new Person( 2 , "androidla" , ( short ) 10 ));
    }

    public void testFind() {
        PersonService ps = new PersonService( this .getContext(), "androidla" , null , 1 );
        Person p = ps.find( 2 );
        System.out.println(p.toString());
    }

    public void testDelete() {
        PersonService ps = new PersonService( this .getContext(), "androidla" , null , 1 );
        ps.delete( 1 );
    }

    public void testListPage() {
        PersonService ps = new PersonService( this .getContext(), "androidla" , null , 1 );
        List<Person> list = ps.queryList( 0 , ( int ) ps.getCount());
        for (Person p : list) {
            System.out.println(p.toString());
        }
    }

    public void testCount() {
        PersonService ps = new PersonService( this .getContext(), "androidla" , null , 1 );
        System.out.println( "count:" + ps.getCount());
    }

    public void testPageUtil() {
        List</person><person> list = PageUtil.getEnd();
        for (Person p : list) {
            System.out.println(p.toString());
        }
    }
}

SqliteActivity.java 程序入口类

package net.androidla.sqlite;

import java.util.ArrayList;
import