TMemDataSet class overview.
Properties
| Name | Description |
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CachedUpdates |
Used to enable or disable the use of cached updates for a dataset.
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IndexFieldNames |
Used to get or set the list of fields on which the recordset is sorted.
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KeyExclusive |
Specifies the upper and lower boundaries for a range.
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LocalConstraints |
Used to avoid setting the Required property of a TField component for NOT NULL fields at the time of opening TMemDataSet.
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LocalUpdate |
Used to prevent implicit update of rows on database server.
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Prepared |
Determines whether a query is prepared for execution or not.
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Ranged |
Indicates whether a range is applied to a dataset.
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UpdateRecordTypes |
Used to indicate the update status for the current record when cached updates are enabled.
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UpdatesPending |
Used to check the status of the cached updates buffer.
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Methods
| Name | Description |
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ApplyRange |
Applies a range to the dataset.
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ApplyUpdates |
Overloaded.
Writes dataset's pending cached updates to a database.
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CancelRange |
Removes any ranges currently in effect for a dataset.
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CancelUpdates |
Clears all pending cached updates from cache and restores dataset in its prior state.
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CommitUpdates |
Clears the cached updates buffer.
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DeferredPost |
Makes permanent changes to the database server.
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EditRangeEnd |
Enables changing the ending value for an existing range.
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EditRangeStart |
Enables changing the starting value for an existing range.
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GetBlob |
Overloaded.
Retrieves TBlob object for a field or current record when only its name or the field itself is known.
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Locate |
Overloaded.
Searches a dataset for a specific record and positions the cursor on it.
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LocateEx |
Overloaded.
Excludes features that don't need to be included to the TMemDataSet.Locate method of TDataSet.
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Prepare |
Allocates resources and creates field components for a dataset.
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RestoreUpdates |
Marks all records in the cache of updates as unapplied.
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RevertRecord |
Cancels changes made to the current record when cached updates are enabled.
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SaveToJSON |
Overloaded.
Saves the current dataset data to a file or a stream in the JSON format.
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SaveToXML |
Overloaded.
Saves the current dataset data to a file or a stream in the XML format compatible with ADO format.
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SetRange |
Sets the starting and ending values of a range, and applies it.
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SetRangeEnd |
Indicates that subsequent assignments to field values specify the end of the range of rows to include in the dataset.
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SetRangeStart |
Indicates that subsequent assignments to field values specify the start of the range of rows to include in the dataset.
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UnPrepare |
Frees the resources allocated for a previously prepared query on the server and client sides.
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UpdateResult |
Reads the status of the latest call to the ApplyUpdates method while cached updates are enabled.
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UpdateStatus |
Indicates the current update status for the dataset when cached updates are enabled.
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Events
| Name | Description |
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OnUpdateError |
Occurs when an exception is generated while cached updates are applied to a database.
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OnUpdateRecord |
Occurs when a single update component can not handle the updates.
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