Delphi: using TClientDataset as an in-memory dataset

Question

According to this page, it\'s possible to use TClientDataset as an in-memory dataset, completely independent of any actual databases or files. It describes how

Answer 1

The code from this page doesn't work in ANY Delphi version. A call to CreateDataSet already puts the dataset into active state ("opened"). You should use .CreateDataSet OR .Open. Not both.

Use .Open when you want to fetch data from a Provider (via ProviderName property) and .CreateDataSet when you want to populate the Dataset by yourself.

BTW: For an in depth reference about ClientDataSets and its features take a look on excellent Cary Jensen articles on CodeGear Developer Network (read the oldest ones, first)