該類如何使用：定義變量
/*
NoteDbHelper noteDbHelper;
noteDbHelper=new NoteDbHelper(MainActivity.this);
//必須傳一個MainActivity.this參數
noteDbHelper.open();
noteDbHelper.createNote（）；
*/

public class NoteDbHelper {private String LOGTAG="NoteDbHelper";private static final String DB_NAME = "data1";private static final int DB_VERSION = 1;private static final String TABLE_NAME = "notes";static final String KEY_TITLE = "title";static final String KEY_BODY = "body";static final String KEY_ROWID = "_id";private Context ctx = null;private NoteSQLiteHelper dbHelper = null;private SQLiteDatabase db = null; /* 構造函數*/ public NoteDbHelper(Context ctx) {this.ctx = ctx;}public NoteDbHelper open(){dbHelper = new NoteSQLiteHelper(ctx, DB_NAME, null, DB_VERSION) ;db=dbHelper.getWritableDatabase();return this;}public int createNote(String title, String body) {ContentValues values = new ContentValues();values.put(KEY_TITLE, title);values.put(KEY_BODY, body);int rowId = (int)db.insert(TABLE_NAME, null, values);return rowId;}public boolean updateNote(long rowId, String title, String body) {ContentValues values = new ContentValues();values.put(KEY_TITLE, title);values.put(KEY_BODY, body);int updatedRows = db.update(TABLE_NAME, values, KEY_ROWID + "=" + rowId, null);return updatedRows > 0;}public boolean deleteNote(long rowId) {int deletedRows = db.delete(TABLE_NAME, KEY_ROWID + "=" + rowId, null);return deletedRows > 0;}public Cursor retrieveAllNotes() {Cursor cur = db.query(TABLE_NAME, null,null, null, null, null, null);return cur;}public List<Notebean> getAllNotes(){//獲取游標Cursor c=retrieveAllNotes();//初始化集合ArrayList<Notebean> itemList = new ArrayList<Notebean>();// c.moveToNext()游標指向下一行while (c.moveToNext()) {Notebean item = new Notebean();//c.getColumnIndex(KEY_ROWID)根據列名獲取該列的索引//c.getInt(index)根據索引獲取數據// item.setId(c.getInt(c.getColumnIndex(KEY_ROWID)));//KEY_ROWID="_id";//返回_id所在的下標int index=c.getColumnIndex(KEY_ROWID);//根據下標來獲取數據int myid= c.getInt(index);//把數據設置到bean中item.setId(myid);item.setTitle(c.getString(c.getColumnIndex(KEY_TITLE)));item.setBody(c.getString(c.getColumnIndex(KEY_BODY)));Log.e(LOGTAG, "Notebean-" + item.toString());//添加數據itemList.add(item);}return itemList;}}

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可能會有點亂，仔細看看就知道大概原理。

與50位技術專家面對面20年技術見證，附贈技術全景圖

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