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); } }