MyDAC

TMemDataSet Members

TMemDataSet class overview.

Properties

Name Description

CachedUpdates

Used to enable or disable the use of cached updates for a dataset.

IndexFieldNames

Used to get or set the list of fields on which the recordset is sorted.

KeyExclusive

Specifies the upper and lower boundaries for a range.

LocalConstraints

Used to avoid setting the Required property of a TField component for NOT NULL fields at the time of opening TMemDataSet.

LocalUpdate

Used to prevent implicit update of rows on database server.

Prepared

Determines whether a query is prepared for execution or not.

Ranged

Indicates whether a range is applied to a dataset.

UpdateRecordTypes

Used to indicate the update status for the current record when cached updates are enabled.

UpdatesPending

Used to check the status of the cached updates buffer.

Methods

Name Description

ApplyRange

Applies a range to the dataset.

ApplyUpdates

Overloaded. Writes dataset's pending cached updates to a database.

CancelRange

Removes any ranges currently in effect for a dataset.

CancelUpdates

Clears all pending cached updates from cache and restores dataset in its prior state.

CommitUpdates

Clears the cached updates buffer.

DeferredPost

Makes permanent changes to the database server.

EditRangeEnd

Enables changing the ending value for an existing range.

EditRangeStart

Enables changing the starting value for an existing range.

GetBlob

Overloaded. Retrieves TBlob object for a field or current record when only its name or the field itself is known.

Locate

Overloaded. Searches a dataset for a specific record and positions the cursor on it.

LocateEx

Overloaded. Excludes features that don't need to be included to the TMemDataSet.Locate method of TDataSet.

Prepare

Allocates resources and creates field components for a dataset.

RestoreUpdates

Marks all records in the cache of updates as unapplied.

RevertRecord

Cancels changes made to the current record when cached updates are enabled.

SaveToXML

Overloaded. Saves the current dataset data to a file or a stream in the XML format compatible with ADO format.

SetRange

Sets the starting and ending values of a range, and applies it.

SetRangeEnd

Indicates that subsequent assignments to field values specify the end of the range of rows to include in the dataset.

SetRangeStart

Indicates that subsequent assignments to field values specify the start of the range of rows to include in the dataset.

UnPrepare

Frees the resources allocated for a previously prepared query on the server and client sides.

UpdateResult

Reads the status of the latest call to the ApplyUpdates method while cached updates are enabled.

UpdateStatus

Indicates the current update status for the dataset when cached updates are enabled.

Events

Name Description

OnUpdateError

Occurs when an exception is generated while cached updates are applied to a database.

OnUpdateRecord

Occurs when a single update component can not handle the updates.
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