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- The MemDS unit contains a TMemDataset class. It implements an in-memory
- TDataset class.
- - The data can be loaded from/to Stream or file.
- This can be automated by setting the 'FileName' property.
- - The data can be copied from another dataset.
- Extra methods:
- Property FileName : String;
- If set, the data is loaded from this file when opening the dataset, and saved
- when it is closed (and modified).
- procedure CreateTable;
- Creates the needed in-memory structures after fielddefs were added.
- See testpop.pp for an example.
- function DataSize : Integer;
- Size of data in memory.
- procedure Clear(ClearDefs : Boolean);
- procedure Clear;
- Clears the data. If cleardefs=True, then fielddefs are cleared.
- If the definitions are cleared (default), the dataset is closed.
- Procedure SaveToFile(AFileName : String);
- Procedure SaveToFile(AFileName : String; SaveData : Boolean);
- Save Data to file. If SaveData=False, then only metadata is written.
- Procedure SaveToStream(F : TStream);
- Procedure SaveToStream(F : TStream; SaveData : Boolean);
- Save Data to stream. If SaveData=False, then only metadata is written.
- Procedure LoadFromStream(F : TStream);
- Load Data from a file created with savetofile.
- Procedure LoadFromFile(AFileName : String);
- Load Data from a stream, created with saveto stream.
- Procedure CopyFromDataset(DataSet : TDataSet);
- Procedure CopyFromDataset(DataSet : TDataSet; CopyData : Boolean);
- Copy data from another dataset. Only fields (not fielddefs) are copied.
- The dataset must be open. If CopyData is false, only the field definitions
- are copied, but no data is copied. By default, data is also copied.
- Property Modified : Boolean Read FModified;
- Indicates whether the in-memory data was modified. When data is modified,
- and the dataset is closed, the data is saved to stream if the 'filename'
- property is set.
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