私は SMS アプリケーションを開発しています。各会話から最後の SMS を取得しようとしています。
これが私のSQLステートメントです：
SELECT MAX(smsTIMESTAMP) AS smsTIMESTAMP,_id, smsID, smsCONID, smsMSG, smsNUM, smsREAD, smsTYPE, smsSHORTMSG, COUNT(*) AS smsNUMMESSAGES FROM sms GROUP BY smsCONID ORDER BY smsTIMESTAMP desc
SQLite Expert でクエリを実行したところ、正しい応答が得られました。
ただし、アプリで実行すると、次のようになります。
これが私のテーブルです
ここに私の Datamanipulator クラスがあります:
public class DataManipulator {
private static final String DATABASE_NAME = "smsapplication.db";
private static final int DATABASE_VERSION = 3;
static final String TABLE_NAME = "sms";
private static Context context;
static SQLiteDatabase db;
private static DataManipulator instance;
private SQLiteStatement insertStmt;
private static final String INSERT = "insert or ignore into "
+ TABLE_NAME + " (smsID, smsCONID, smsMSG, smsNUM, smsREAD, smsTIMESTAMP, smsTYPE, smsSHORTMSG) values (?,?,?,?,?,?,?,?)";
public DataManipulator(Context context) {
DataManipulator.context = context;
OpenHelper openHelper = new OpenHelper(DataManipulator.context);
DataManipulator.db = openHelper.getWritableDatabase();
this.insertStmt = DataManipulator.db.compileStatement(INSERT);
}
public static DataManipulator getInstance(Context mContext)
{
if(instance == null)
{
instance = new DataManipulator(mContext);
}
return instance;
}
public long insert(int smsID, int smsCONID, String smsMSG,
String smsNUM, int smsREAD, long smsTIMESTAMP, String smsTYPE, String smsSHORTMSG) {
this.insertStmt.bindLong(1, smsID);
this.insertStmt.bindLong(2, smsCONID);
this.insertStmt.bindString(3, smsMSG);
this.insertStmt.bindString(4, smsNUM);
this.insertStmt.bindLong(5, smsREAD);
this.insertStmt.bindString(6, String.valueOf(smsTIMESTAMP));
this.insertStmt.bindString(7, smsTYPE);
this.insertStmt.bindString(8, smsSHORTMSG);
return this.insertStmt.executeInsert();
}
public void deleteAll() {
db.delete(TABLE_NAME, null, null);
}
public Cursor getLastSmsForAllConversations()
{
Cursor cursor = db.query(TABLE_NAME, new String[] {"_id"," MAX(smsTIMESTAMP) AS smsTIMESTAMP ", "smsCONID", "smsNUM", "smsREAD", "smsTYPE","smsSHORTMSG","COUNT(*) AS smsNUMMESSAGES" },
null, null, "smsCONID", null, "smsTIMESTAMP desc");
return cursor;
}
public Cursor getConversationMessages(int conID)
{
Cursor cursor = db.query(TABLE_NAME, new String[] {"_id", "smsID", "smsCONID", "smsMSG", "smsNUM", "smsREAD", "smsTIMESTAMP", "smsTYPE","smsSHORTMSG" },
"smsCONID="+conID, null, null, null, "smsTIMESTAMP asc");
return cursor;
}
public void printCursor()
{
Cursor cursor = db.rawQuery("SELECT MAX(smsTIMESTAMP) AS smsTIMESTAMP,_id, smsID, smsCONID, smsMSG, smsNUM, smsREAD, smsTYPE, smsSHORTMSG, COUNT(*) AS smsNUMMESSAGES FROM sms GROUP BY smsCONID ORDER BY smsTIMESTAMP desc", null);
// db.query(TABLE_NAME, new String[] {"_id","smsTIMESTAMP AS smsTIMESTAMP ", "smsCONID", "smsNUM", "smsREAD", "smsTYPE","smsSHORTMSG" },"smsCONID=40", null, null, null, "smsTIMESTAMP desc");
if (cursor.moveToFirst()){
do{
String data ="";
data= cursor.getString(cursor.getColumnIndex("smsTIMESTAMP"))+" - " +cursor.getString(cursor.getColumnIndex("smsSHORTMSG"));
Log.i("data", data);
}while(cursor.moveToNext());
}
cursor.close();
}
private static class OpenHelper extends SQLiteOpenHelper {
OpenHelper(Context context) {
super(context, DATABASE_NAME, null, DATABASE_VERSION);
}
@Override
public void onCreate(SQLiteDatabase db) {
db.execSQL("CREATE TABLE " + TABLE_NAME + " (_id INTEGER , smsID INTEGER PRIMARY KEY, smsCONID INTEGER, smsMSG TEXT,smsNUM TEXT, smsREAD INTEGER, smsTIMESTAMP INTEGER, smsTYPE TEXT, smsSHORTMSG TEXT)");
}
@Override
public void onUpgrade(SQLiteDatabase db, int oldVersion, int newVersion) {
db.execSQL("DROP TABLE IF EXISTS " + TABLE_NAME);
onCreate(db);
}
@Override
public synchronized void close() {
if (db != null)
db.close();
super.close();
}
}
}