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Table Locking in Insert Command.

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Old 05-13-2013
Table Locking in Insert Command.
Hi,

i have a java based tool which does insert operation in a TABLE, and in parallel the same table is used by my C++ code which does select Query.

the Table will be always busy, but sometimes the table is getting locked when i try to make an insert, am bit confused whether the lock is because of SELECT query from my C++ code or by the INSERT QUERY from the java Tool.

Do i need to modify the Query if so how..? and from the google i learnt that select puts an internal LOCK.

currently am locking the table before insert below is my query

lock table table_name in exclusive mode nowait

and giving a commit after performing the DML operation so that lock will be removed automatically.

can anyone please solve my query.?

thanks,
senthil
Last edited by Scott; 05-13-2013 at 11:39 AM.. Reason: Crosspost. Closed
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LEARN ABOUT DEBIAN

tk::table

Table(3pm)						User Contributed Perl Documentation						Table(3pm)

NAME

       Tk::Table - Scrollable 2 dimensional table of Tk widgets

SYNOPSIS

	 use Tk::Table;

	 $table = $parent->Table(-rows => number,
				 -columns => number,
				 -scrollbars => anchor,
				 -fixedrows => number,
				 -fixedcolumns => number,
				 -takefocus => boolean);

	 $widget = $table->Button(...);

	 $old = $table->put($row,$col,$widget);
	 $old = $table->put($row,$col,"Text");	# simple Label
	 $widget = $table->get($row,$col);

	 $cols = $table->totalColumns;
	 $rows = $table->totalRows;

	 $table->see($widget);
	 $table->see($row,$col);

	 ($row,$col) = $table->Posn($widget);

DESCRIPTION

       Tk::Table is an all-perl widget/geometry manager which allows a two dimensional table of arbitary perl/Tk widgets to be displayed.

       Entries in the Table are simply ordinary perl/Tk widgets. They should be created with the Table as their parent. Widgets are positioned in
       the table using:

	$table->put($row,$col,$widget)

       If $widget is not a reference it is treated as a string, and a Lable widget is created with the string as its text.

       All the widgets in each column are set to the same width - the requested width of the widest widget in the column.  Likewise, all the
       widgets in each row are set to the same height - the requested height of the tallest widget in the column.

       A number of rows and/or columns can be marked as 'fixed' - and so can serve as 'headings' for the remainder the rows which are scrollable.

       The requested size of the table as a whole is such that the number of rows specified by -rows (default 10), and number of columns specified
       by -columns (default 10) can be displayed.

       If the Table is told it can take the keyboard focus then cursor and scroll keys scroll the displayed widgets.

       The Table will create and manage its own scrollbars if requested via -scrollbars.

       The table can be emptied using

	$table->clear

       the widgets which were in the table are destroyed.

       The Tk::Table widget is derived from a Tk::Frame, so inherits all its configure options.

BUGS 
/ Snags / Possible enhancements
       o   Very large Tables consume a lot of X windows.

       o   No equivalent of pack's -anchor/-pad etc. options

SEE ALSO

       Tk::grid, Tk::HList, Tk::TableMatrix, Tk::MListbox, Tk::Columns

perl v5.14.2							    2010-05-29								Table(3pm)