/// <summary>
/// Positions the cursor on a record specified by a bookmark.
/// </summary>
/// <param name="bookmark">The bookmarkto go to.</param>
public virtual void GotoBookmark(Bookmark bookmark)
{
this.Tracer.TraceVerbose("GotoBookmark");
this.CheckNotDisposed();
this.CancelUpdate();
Api.JetGotoBookmark(this.session, this.table, bookmark.BookmarkData, bookmark.BookmarkLength);
this.hasCurrency = true;
this.CheckNotDisposed();
}
/// <summary>
/// Update the current record.
/// </summary>
/// <returns>The bookmark of the updated record.</returns>
public virtual Bookmark Update()
{
this.Tracer.TraceVerbose("Update");
this.CheckNotDisposed();
var updateBookmark = new byte[SystemParameters.BookmarkMost];
int bookmarkSize;
Api.JetUpdate(this.session, this.table, updateBookmark, updateBookmark.Length, out bookmarkSize);
this.inUpdate = false;
var bookmark = new Bookmark
{
BookmarkData = updateBookmark,
BookmarkLength = bookmarkSize
};
this.GotoBookmark(bookmark);
return bookmark;
}
/// <summary>
/// Initializes a new instance of the RecordBase class. This constructor
/// is used for a record which already exists in the table.
/// </summary>
/// <param name="table">The table containing the record.</param>
/// <param name="bookmark">The bookmark of the record.</param>
protected RecordBase(TableBase table, Bookmark bookmark)
: this()
{
this.table = table;
this.Bookmark = bookmark;
}
/// <summary>
/// Get the bookmark of the current record.
/// </summary>
/// <returns>The bookmark of the current record.</returns>
public virtual Bookmark GetBookmark()
{
this.Tracer.TraceVerbose("GetBookmark");
this.CheckNotDisposed();
this.CheckHasCurrency();
byte[] bookmarkData = new byte[SystemParameters.BookmarkMost];
int bookmarkLength;
Api.JetGetBookmark(this.session, this.table, bookmarkData, bookmarkData.Length, out bookmarkLength);
Debug.Assert(bookmarkLength <= bookmarkData.Length, "Bookmark is too long");
var bookmark = new Bookmark
{
BookmarkData = bookmarkData,
BookmarkLength = bookmarkLength
};
return bookmark;
}
/// <summary>
/// Initializes a new instance of the ReadWriteRecord class. This constructor
/// is used for a record which already exists in the table.
/// </summary>
/// <param name="table">The table containing the record.</param>
/// <param name="bookmark">The bookmark of the record.</param>
public ReadWriteRecord(TableBase table, Bookmark bookmark) :
base(table, bookmark)
{
}
/// <summary>
/// Create a Record object for the record with the specified bookmark.
/// </summary>
/// <param name="bookmark">The bookmark of the record.</param>
/// <returns>A new ReadOnlyRecord.</returns>
protected override Record CreateRecord(Bookmark bookmark)
{
return new ReadOnlyRecord(this, bookmark);
}
/// <summary>
/// Initializes a new instance of the ReadOnlyRecord class. This constructor
/// is used for a record which already exists in the table.
/// </summary>
/// <param name="table">The table containing the record.</param>
/// <param name="bookmark">The bookmark of the record.</param>
public ReadOnlyRecord(TableBase table, Bookmark bookmark)
: base(table, bookmark)
{
}
/// <summary> /// Create a Record object for the record with the specified bookmark. /// </summary> /// <remarks> /// Implemented by ReadOnlyTable and ReadWriteTable. /// </remarks> /// <param name="bookmark">The bookmark of the record.</param> /// <returns>A new record object.</returns> protected abstract Record CreateRecord(Bookmark bookmark);
/// <summary>
/// Initializes a new instance of the ReadOnlyRecord class. This constructor
/// is used for a record which already exists in the table.
/// </summary>
/// <param name="table">The table containing the record.</param>
/// <param name="bookmark">The bookmark of the record.</param>
public ReadOnlyRecord(TableBase table, Bookmark bookmark) :
base(table, bookmark)
{
}