使用嵌入式关系型SQLite数据库存储数据

package com.example.service;

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

public class DBOpenHelper extends SQLiteOpenHelper {

	public DBOpenHelper(Context context) {
		super(context, "example.db", null, 2);//在<包>/databases/下
	}

	@Override
	public void onCreate(SQLiteDatabase db) {//数据库每次创建是被调用
		db.execSQL("CREATE TABLE person (personid integer primary key autoincrement, name varchar(20))");

	}

	@Override
	public void onUpgrade(SQLiteDatabase db, int arg1, int arg2) {//数据库版本发生变化是被调用
		db.execSQL(" ALTER TABLE person ADD phone VARCHAR(12) NULL "); //往表中增加一列
		// DROP TABLE IF EXISTS person 删除表
	}

}

package com.example.service;

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

import com.example.domain.Person;

import android.content.Context;
import android.database.Cursor;
import android.database.sqlite.SQLiteDatabase;

public class PersonService {
	private DBOpenHelper dbOpenHelper;

	public PersonService(Context context) {
		this.dbOpenHelper = new DBOpenHelper(context);
	}
	/**
	 * 新增记录
	 * @param person
	 */
	public void save(Person person){
		SQLiteDatabase db=dbOpenHelper.getWritableDatabase();
		db.execSQL("insert into person(name, phone) values(?,?)", 
				new Object[]{person.getName(),person.getPhone()});
		
	}
	/**
	 * 删除记录
	 * @param person
	 */
	public void delete(Integer id){
		SQLiteDatabase db=dbOpenHelper.getWritableDatabase();
		db.execSQL("delete from person  where personid=?", 
				new Object[]{id});
	}
	/**
	 * 更新记录
	 * @param person
	 */
	public void update(Person person){
		SQLiteDatabase db=dbOpenHelper.getWritableDatabase();
		db.execSQL("update person set name=? ,phone=? where personid=?", 
				new Object[]{person.getName(),person.getPhone(),person.getId()});
	}
	/**
	 * 查找记录
	 * @param id 记录ID
	 * @return
	 */
	public Person find(Integer id){
		SQLiteDatabase db=dbOpenHelper.getReadableDatabase();
		Cursor cursor=db.rawQuery("select * from person where personid=?", new String[]{id.toString()});
		if(cursor.moveToFirst()){
			int personid=cursor.getInt(cursor.getColumnIndex("personid"));
			String name=cursor.getString(cursor.getColumnIndex("name"));
			String phone=cursor.getString(cursor.getColumnIndex("phone"));
			return new Person(personid, name, phone);
		}
		cursor.close();
		return null;
	}
	/**
	 * 分页获取记录
	 * @param offset 跳过前面多少条记录
	 * @param maxResult 每页显示多少条记录
	 * @return
	 */
	public List<Person> getScrollData(int offset,int maxResult){
		SQLiteDatabase db=dbOpenHelper.getReadableDatabase();
		List<Person> persons=new ArrayList<Person>();
		Cursor cursor=db.rawQuery("select * from person order by personid asc limit?,?", 
				new String[]{String.valueOf(offset),String.valueOf(maxResult)});
		while(cursor.moveToNext()){
			int personid=cursor.getInt(cursor.getColumnIndex("personid"));
			String name=cursor.getString(cursor.getColumnIndex("name"));
			String phone=cursor.getString(cursor.getColumnIndex("phone"));
			persons.add(new Person(personid, name, phone));
		}
		cursor.close();
		return persons;
	}
	/**
	 * 获取记录总条数
	 * @return
	 */
	public long getCount(){
		SQLiteDatabase db=dbOpenHelper.getReadableDatabase();
		Cursor cursor=db.rawQuery("select count(*) from person ", null);
		cursor.moveToFirst();
		long result=cursor.getLong(0);
		cursor.close();
		return result;
	}
}

package com.example.service;

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

import com.example.domain.Person;

import android.content.ContentValues;
import android.content.Context;
import android.database.Cursor;
import android.database.sqlite.SQLiteDatabase;

public class OtherPersonService {
	private DBOpenHelper dbOpenHelper;

	public OtherPersonService(Context context) {
		this.dbOpenHelper = new DBOpenHelper(context);
	}
	/**
	 * 新增记录
	 * @param person
	 */
	public void save(Person person){
		SQLiteDatabase db=dbOpenHelper.getWritableDatabase();
		ContentValues values=new ContentValues();
		values.put("name", person.getName());
		values.put("phone", person.getPhone());
		db.insert("person", null, values);
		
	}
	/**
	 * 删除记录
	 * @param person
	 */
	public void delete(Integer id){
		SQLiteDatabase db=dbOpenHelper.getWritableDatabase();
		db.delete("person", "personid=?",new String[]{id.toString()} );
	}
	/**
	 * 更新记录
	 * @param person
	 */
	public void update(Person person){
		SQLiteDatabase db=dbOpenHelper.getWritableDatabase();
		ContentValues values=new ContentValues();
		values.put("name", person.getName());
		values.put("phone", person.getPhone());
		db.update("person", values, "personid=?", new String[]{person.getId().toString()});
	}
	/**
	 * 查找记录
	 * @param id 记录ID
	 * @return
	 */
	public Person find(Integer id){
		SQLiteDatabase db=dbOpenHelper.getReadableDatabase();
		Cursor cursor=db.query("person", null, "personid=?", new String[]{id.toString()}, null, null, null);
		if(cursor.moveToFirst()){
			int personid=cursor.getInt(cursor.getColumnIndex("personid"));
			String name=cursor.getString(cursor.getColumnIndex("name"));
			String phone=cursor.getString(cursor.getColumnIndex("phone"));
			return new Person(personid, name, phone);
		}
		cursor.close();
		return null;
	}
	/**
	 * 分页获取记录
	 * @param offset 跳过前面多少条记录
	 * @param maxResult 每页显示多少条记录
	 * @return
	 */
	public List<Person> getScrollData(int offset,int maxResult){
		SQLiteDatabase db=dbOpenHelper.getReadableDatabase();
		List<Person> persons=new ArrayList<Person>();
		Cursor cursor=db.query("person", null, null, null,null,null, "personid asc", offset+","+maxResult);
		while(cursor.moveToNext()){
			int personid=cursor.getInt(cursor.getColumnIndex("personid"));
			String name=cursor.getString(cursor.getColumnIndex("name"));
			String phone=cursor.getString(cursor.getColumnIndex("phone"));
			persons.add(new Person(personid, name, phone));
		}
		cursor.close();
		return persons;
	}
	/**
	 * 获取记录总条数
	 * @return
	 */
	public long getCount(){
		SQLiteDatabase db=dbOpenHelper.getReadableDatabase();
		Cursor cursor=db.query("person", new String[]{"count(*)"}, null, null, null, null, null);
		cursor.moveToFirst();
		long result=cursor.getLong(0);
		cursor.close();
		return result;
	}
}