android.database.Cursor.getCount()方法的使用及代码示例

x33g5p2x  于2022-01-17 转载在 其他  
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本文整理了Java中android.database.Cursor.getCount()方法的一些代码示例，展示了Cursor.getCount()的具体用法。这些代码示例主要来源于Github/Stackoverflow/Maven等平台，是从一些精选项目中提取出来的代码，具有较强的参考意义，能在一定程度帮忙到你。Cursor.getCount()方法的具体详情如下：
包路径：android.database.Cursor
类名称：Cursor
方法名：getCount

Cursor.getCount介绍

暂无

代码示例

代码示例来源：origin: stackoverflow.com

public boolean Exists(String _id) {
  Cursor cursor = mDb.rawQuery("select 1 from yourTable where _id=%s", 
    new String[] { _id });
  boolean exists = (cursor.getCount() > 0);
  cursor.close();
  return exists;
}

代码示例来源：origin: stackoverflow.com

Cursor cursor = MediaStore.Images.Thumbnails.queryMiniThumbnail(
               getContentResolver(), selectedImageUri,
               MediaStore.Images.Thumbnails.MINI_KIND,
               null );
if( cursor != null && cursor.getCount() > 0 ) {
   cursor.moveToFirst();//**EDIT**
   String uri = cursor.getString( cursor.getColumnIndex( MediaStore.Images.Thumbnails.DATA ) );
}

代码示例来源：origin: stackoverflow.com

public static int getOrientation(Context context, Uri photoUri) {
  /* it's on the external media. */
  Cursor cursor = context.getContentResolver().query(photoUri,
      new String[] { MediaStore.Images.ImageColumns.ORIENTATION }, null, null, null);

  if (cursor.getCount() != 1) {
    return -1;
  }

  cursor.moveToFirst();
  return cursor.getInt(0);
}

代码示例来源：origin: cats-oss/android-gpuimage

@Override
  protected int getImageOrientation() throws IOException {
    Cursor cursor = context.getContentResolver().query(uri,
        new String[]{MediaStore.Images.ImageColumns.ORIENTATION}, null, null, null);
    if (cursor == null || cursor.getCount() != 1) {
      return 0;
    }
    cursor.moveToFirst();
    int orientation = cursor.getInt(0);
    cursor.close();
    return orientation;
  }
}

代码示例来源：origin: greenrobot/greenDAO

/** Reads all available rows from the given cursor and returns a list of new ImageTO objects. */
public List<RelationSource2> loadAllDeepFromCursor(Cursor cursor) {
  int count = cursor.getCount();
  List<RelationSource2> list = new ArrayList<RelationSource2>(count);
  
  if (cursor.moveToFirst()) {
    if (identityScope != null) {
      identityScope.lock();
      identityScope.reserveRoom(count);
    }
    try {
      do {
        list.add(loadCurrentDeep(cursor, false));
      } while (cursor.moveToNext());
    } finally {
      if (identityScope != null) {
        identityScope.unlock();
      }
    }
  }
  return list;
}

代码示例来源：origin: google/agera

@NonNull
 @Override
 public Result<List<T>> merge(@NonNull final SQLiteDatabase database,
   @NonNull final SqlRequest input) {
  try {
   final Cursor cursor = database.rawQuery(input.sql, input.arguments);
   try {
    final int count = cursor.getCount();
    if (count == 0) {
     return success(Collections.<T>emptyList());
    }
    final List<T> items = new ArrayList<>(count);
    while (cursor.moveToNext()) {
     items.add(cursorToItem.apply(cursor));
    }
    return success(items);
   } finally {
    cursor.close();
   }
  } catch (final SQLException e) {
   return failure(e);
  }
 }
}

代码示例来源：origin: stackoverflow.com

MatrixCursor cursor = new MatrixCursor(newColumnNames, source.getCount());
while (source.moveToNext()) {
  MatrixCursor.RowBuilder row = cursor.newRow();
  for (int i = 0; i < columnNames.length; i++) {
    row.add(source.getString(i));

代码示例来源：origin: kaaproject/kaa

private long getAffectedRowCount() {
 synchronized (database) {
  Cursor cursor = null;
  try {
   cursor = database.rawQuery(GET_CHANGES_QUERY, null);
   if (cursor != null && cursor.getCount() > 0 && cursor.moveToFirst()) {
    return cursor.getLong(cursor.getColumnIndex(CHANGES_QUERY_RESULT));
   } else {
    return 0;
   }
  } finally {
   tryCloseCursor(cursor);
  }
 }
}

代码示例来源：origin: stackoverflow.com

int rotation =-1;
 long fileSize = new File(filePath).length();
 Cursor mediaCursor = content.query(MediaStore.Images.Media.EXTERNAL_CONTENT_URI, new String[] {MediaStore.Images.ImageColumns.ORIENTATION, MediaStore.MediaColumns.SIZE }, MediaStore.MediaColumns.DATE_ADDED + ">=?", new String[]{String.valueOf(captureTime/1000 - 1)}, MediaStore.MediaColumns.DATE_ADDED + " desc");
 if (mediaCursor != null && captureTime != 0 && mediaCursor.getCount() !=0 ) {
   while(mediaCursor.moveToNext()){
     long size = mediaCursor.getLong(1);
     //Extra check to make sure that we are getting the orientation from the proper file
     if(size == fileSize){
       rotation = mediaCursor.getInt(0);
       break;
     }
   }
 }

代码示例来源：origin: stackoverflow.com

public String getContactDisplayNameByNumber(String number) {
  Uri uri = Uri.withAppendedPath(ContactsContract.PhoneLookup.CONTENT_FILTER_URI, Uri.encode(number));
  String name = "?";

  ContentResolver contentResolver = getContentResolver();
  Cursor contactLookup = contentResolver.query(uri, new String[] {BaseColumns._ID,
      ContactsContract.PhoneLookup.DISPLAY_NAME }, null, null, null);

  try {
    if (contactLookup != null && contactLookup.getCount() > 0) {
      contactLookup.moveToNext();
      name = contactLookup.getString(contactLookup.getColumnIndex(ContactsContract.Data.DISPLAY_NAME));
      //String contactId = contactLookup.getString(contactLookup.getColumnIndex(BaseColumns._ID));
    }
  } finally {
    if (contactLookup != null) {
      contactLookup.close();
    }
  }

  return name;
}

代码示例来源：origin: naman14/Timber

public static final int getSongCountForPlaylist(final Context context, final long playlistId) {
  Cursor c = context.getContentResolver().query(
      MediaStore.Audio.Playlists.Members.getContentUri("external", playlistId),
      new String[]{BaseColumns._ID}, MUSIC_ONLY_SELECTION, null, null);
  if (c != null) {
    int count = 0;
    if (c.moveToFirst()) {
      count = c.getCount();
    }
    c.close();
    c = null;
    return count;
  }
  return 0;
}

代码示例来源：origin: greenrobot/greenDAO

/** Reads all available rows from the given cursor and returns a list of new ImageTO objects. */
public List<RelationEntity> loadAllDeepFromCursor(Cursor cursor) {
  int count = cursor.getCount();
  List<RelationEntity> list = new ArrayList<RelationEntity>(count);
  
  if (cursor.moveToFirst()) {
    if (identityScope != null) {
      identityScope.lock();
      identityScope.reserveRoom(count);
    }
    try {
      do {
        list.add(loadCurrentDeep(cursor, false));
      } while (cursor.moveToNext());
    } finally {
      if (identityScope != null) {
        identityScope.unlock();
      }
    }
  }
  return list;
}

代码示例来源：origin: stackoverflow.com

public int getProfilesCount() {
  String countQuery = "SELECT  * FROM " + TABLE_NAME;
  SQLiteDatabase db = this.getReadableDatabase();
  Cursor cursor = db.rawQuery(countQuery, null);
  int cnt = cursor.getCount();
  cursor.close();
  return cnt;
}

代码示例来源：origin: amitshekhariitbhu/Android-Debug-Database

public int count() {
    SQLiteDatabase db = getReadableDatabase();
    Cursor cursor = db.rawQuery("select * from cars", null);
    if (cursor != null && cursor.getCount() > 0) {
      cursor.moveToFirst();
      return cursor.getInt(0);
    } else {
      return 0;
    }
  }
}

代码示例来源：origin: greenrobot/greenDAO

/** Returns the count (number of results matching the query). Uses SELECT COUNT (*) sematics. */
public long count() {
  checkThread();
  Cursor cursor = dao.getDatabase().rawQuery(sql, parameters);
  try {
    if (!cursor.moveToNext()) {
      throw new DaoException("No result for count");
    } else if (!cursor.isLast()) {
      throw new DaoException("Unexpected row count: " + cursor.getCount());
    } else if (cursor.getColumnCount() != 1) {
      throw new DaoException("Unexpected column count: " + cursor.getColumnCount());
    }
    return cursor.getLong(0);
  } finally {
    cursor.close();
  }
}

代码示例来源：origin: TeamNewPipe/NewPipe

public ArrayList<FinishedMission> loadFinishedMissions() {
  SQLiteDatabase database = downloadMissionHelper.getReadableDatabase();
  Cursor cursor = database.query(MISSIONS_TABLE_NAME, null, null,
      null, null, null, DownloadMissionHelper.KEY_TIMESTAMP);
  int count = cursor.getCount();
  if (count == 0) return new ArrayList<>(1);
  ArrayList<FinishedMission> result = new ArrayList<>(count);
  while (cursor.moveToNext()) {
    result.add(DownloadMissionHelper.getMissionFromCursor(cursor));
  }
  return result;
}

代码示例来源：origin: stackoverflow.com

ContentResolver cr = getContentResolver();
    Cursor cur = cr.query(Contacts.CONTENT_URI, 
    null, null, null, null);

if(cur != null && cur.moveToFirst())
{
    String id = cur.getString(cur.getColumnIndex(Contacts._ID));

    if (cur.getCount() > 0) {
     ...

代码示例来源：origin: greenrobot/greenDAO

public TreeEntity loadDeep(Long key) {
  assertSinglePk();
  if (key == null) {
    return null;
  }
  StringBuilder builder = new StringBuilder(getSelectDeep());
  builder.append("WHERE ");
  SqlUtils.appendColumnsEqValue(builder, "T", getPkColumns());
  String sql = builder.toString();
  
  String[] keyArray = new String[] { key.toString() };
  Cursor cursor = db.rawQuery(sql, keyArray);
  
  try {
    boolean available = cursor.moveToFirst();
    if (!available) {
      return null;
    } else if (!cursor.isLast()) {
      throw new IllegalStateException("Expected unique result, but count was " + cursor.getCount());
    }
    return loadCurrentDeep(cursor, true);
  } finally {
    cursor.close();
  }
}

代码示例来源：origin: greenrobot/greenDAO

/** Reads all available rows from the given cursor and returns a list of new ImageTO objects. */
public List<TreeEntity> loadAllDeepFromCursor(Cursor cursor) {
  int count = cursor.getCount();
  List<TreeEntity> list = new ArrayList<TreeEntity>(count);
  
  if (cursor.moveToFirst()) {
    if (identityScope != null) {
      identityScope.lock();
      identityScope.reserveRoom(count);
    }
    try {
      do {
        list.add(loadCurrentDeep(cursor, false));
      } while (cursor.moveToNext());
    } finally {
      if (identityScope != null) {
        identityScope.unlock();
      }
    }
  }
  return list;
}

代码示例来源：origin: greenrobot/greenDAO

LazyList(InternalQueryDaoAccess<E> daoAccess, Cursor cursor, boolean cacheEntities) {
  this.cursor = cursor;
  this.daoAccess = daoAccess;
  size = cursor.getCount();
  if (cacheEntities) {
    entities = new ArrayList<E>(size);
    for (int i = 0; i < size; i++) {
      entities.add(null);
    }
  } else {
    entities = null;
  }
  if (size == 0) {
    cursor.close();
  }
  lock = new ReentrantLock();
}

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