CheckHeaderIsReady(columnIndex: i, methodName:"IsDBNullAsync"); }catch(Exception ex) {if(!ADP.IsCatchableExceptionType(ex)) {throw; }returnADP.CreatedTaskWithException<bool>(ex); } if((_sharedState._nextColumnHeaderToRead > i) && (!cancellationToken.IsCancellationRequested) && (_currentTask ...
How to behave if the table already exists. * fail: Raise a ValueError. * replace: Drop the table before inserting new values. * append: Insert new values to the existing table. index : bool, default True Write DataFrame index as a column. Uses `index_label` as the column name in the...
If the property is read-only, it will throw an exception. See also https://www.php.net/manual/en/function.unset.php. public void __unset ( $name ) $name string The property name throws yii\base\InvalidCallException if the property is read only. Source code bindColumn() public ...
checkbox list validation to check multiple(3) item has been checked checkbox: how to checked only one checkbox? Checking if an object exists? VB.NET Checking if datatable column is not null/empty? checking if pdf file is password protected Checking if Row is NULL, looping though a datatable...
TypeDescription System.Boolean true if the MySqlDataReader is closed; otherwise false.OverridesSystem.Data.Common.DbDataReader.IsClosedItem[Int32]Overloaded. Gets the value of a column in its native format. In C#, this property is the indexer for the MySqlDataReader class....
Since 2021-07-01, reading data from Yahoo fails with a nondescript error message. Calling the URL (see RemoteDataError below) directly from a browser succeeds. wget returns error 404: Not Found. Interesting is the name of the background ...
which expose more generic managed providers that can access a variety of data sources. If you are developing against SQL Server™ or Oracle, it would be more efficient to use the provider that was made specifically for these databases. In this column, I will query the SQL Server Northwind ...
ValidatingDataReader will query the destination table to pull metadata information and check mappings. It will then monitor each record passed from the original IDataReader and check the values against the destination table column lengths. using (CsvDataReader reader = CsvDataReader.Parse("id,name\...
Place a break point and use the "Locals" or "Watch" window to drill into dr["FirstName'] to see if it has a value. Use the "Immediate" window to execute code like GetOrdinal() to see if the column exists.Copy ?dr.GetOrdinal("FirstName") ...
false if ColumnSize uses character semantics This value is always true when connected to a database version earlier than Oracle9i. IsExpression System.Boolean true if the column is an expression; otherwise false. IsHidden System.Boolean true if the column is hidden; otherwise false. IsRea...