如何从sqlite数据库android计算一行表的行

Question

我想在android中计算一个表的行.我使用了2种方法但没有成功并获得警告消息

Launch timeout has expired, giving up wake lock!
 Activity idle timeout for HistoryRecord{44e26a30 com.india.screen/.CategoryList}

我试过了-

String query="Select count(*) from Holyplace_Tbl";

1. 使用rawQuery

   public void countRows(String query){

   Cursor mcursor = assetDatabaseHelper.executeQuery(query);
   mcursor.moveToFirst();
   int icount = mcursor.getInt(0);
   System.out.println("NUMBER IN DB: " + icount);
   mcursor.close();
   

   }

2. 使用DatabaseUtils

   public int countRows(String query)
   {
   
      int sometotal = (int) DatabaseUtils.longForQuery(sqliteDatabaseObj, query, null);
     return sometotal;
    }
   

   AssetDatabaseOpenHelper.class

Answer 1

试试这个

private static final String DB_TABLE_PLACES = "Places";
private SQLiteDatabase mDatabase;

private long fetchPlacesCount() {
    String sql = "SELECT COUNT(*) FROM " + DB_TABLE_PLACES;
    SQLiteStatement statement = mDatabase.compileStatement(sql);
    long count = statement.simpleQueryForLong();
    return count;
}

在这里查看更多.