package cn.itcast.service;import java.util.ArrayList;import java.util.List;import android.content.Context;import android.database.Cursor;import android.database.sqlite.SQLiteDatabase;import cn.itcast.domain.Person;public class PersonService {private DBOpenHelper dbOpenHelper;public PersonService(Context context){dbOpenHelper = new DBOpenHelper(context);}public void payment(){SQLiteDatabase db = dbOpenHelper.getWritableDatabase();db.beginTransaction();//开启事务try{db.execSQL("update person set amount=amount-10 where personid=?", new Object[]{1});db.execSQL("update person set amount=amount+10 where personid=?", new Object[]{2});db.setTransactionSuccessful();//设置事务标志为成功，在结束事务时才会提供事务，否则回滚事务}finally{db.endTransaction();//结束事务}}public void save(Person person){SQLiteDatabase db = dbOpenHelper.getWritableDatabase();db.execSQL("insert into person(name, phone, amount) values(?,?,?)", new Object[]{person.getName(), person.getPhone(), person.getAmount()});//db.close();}public void update(Person person){SQLiteDatabase db = dbOpenHelper.getWritableDatabase();db.execSQL("update person set name=?,phone=?, amount=? where personid=?", new Object[]{person.getName(), person.getPhone(), person.getAmount(), person.getId()});}public void delete(Integer id){SQLiteDatabase db = dbOpenHelper.getWritableDatabase();db.execSQL("delete from person where personid=?", new Object[]{id});}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"));int amount = cursor.getInt(cursor.getColumnIndex("amount"));cursor.close();return new Person(personid, name, phone, amount);}return null;}public List<Person> getScrollData(int offset, int maxResult){List<Person> persons = new ArrayList<Person>();SQLiteDatabase db = dbOpenHelper.getReadableDatabase();Cursor cursor = db.rawQuery("select * from person 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"));int amount = cursor.getInt(cursor.getColumnIndex("amount"));persons.add(new Person(personid, name, phone, amount));}return persons;}public Cursor getCursorScrollData(int offset, int maxResult){SQLiteDatabase db = dbOpenHelper.getReadableDatabase();return db.rawQuery("select personid as _id,name,phone,amount from person limit ?,?", new String[]{String.valueOf(offset), String.valueOf(maxResult)});}public long getCount(){SQLiteDatabase db = dbOpenHelper.getReadableDatabase();Cursor cursor = db.rawQuery("select count(*) from person", null);cursor.moveToFirst();return cursor.getLong(0);}}
package cn.itcast.service;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 cn.itcast.domain.Person;public class OtherPersonService {private DBOpenHelper dbOpenHelper;public OtherPersonService(Context context){dbOpenHelper = new DBOpenHelper(context);}public void save(Person person){SQLiteDatabase db = dbOpenHelper.getWritableDatabase();ContentValues values = new ContentValues();values.put("name", person.getName());values.put("phone", person.getPhone());values.put("amount", person.getAmount());db.insert("person", null, values); // insert into person(personid) values(NULL)//db.close();}public void update(Person person){SQLiteDatabase db = dbOpenHelper.getWritableDatabase();ContentValues values = new ContentValues();values.put("name", person.getName());values.put("phone", person.getPhone());values.put("amount", person.getAmount());db.update("person", values, "personid=?", new String[]{person.getId().toString()});}public void delete(Integer id){SQLiteDatabase db = dbOpenHelper.getWritableDatabase();db.delete("person", "personid=?", new String[]{id.toString()});}public Person find(Integer id){SQLiteDatabase db = dbOpenHelper.getReadableDatabase();Cursor cursor = db.query("person", new String[]{"personid","name","phone"}, "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"));int amount = cursor.getInt(cursor.getColumnIndex("amount"));cursor.close();return new Person(personid, name, phone, amount);}return null;}public List<Person> getScrollData(int offset, int maxResult){List<Person> persons = new ArrayList<Person>();SQLiteDatabase db = dbOpenHelper.getReadableDatabase();Cursor cursor = db.query("person", null, null, null, null, null, null, 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"));int amount = cursor.getInt(cursor.getColumnIndex("amount"));persons.add(new Person(personid, name, phone, amount));}return persons;}public long getCount(){SQLiteDatabase db = dbOpenHelper.getReadableDatabase();Cursor cursor = db.query("person", new String[]{"count(*)"} , null, null, null, null, null);cursor.moveToFirst();return cursor.getLong(0);}}
