Programming Guide - Actian

How You Can Create and Modify Fields DynamicallyThe following code creates a matrix field, sets the number of rows andcolumns, populates the matrix field, and removes empty cells:mfield = MatrixField.Create();mfield.Rows = 25;mfield.Columns = 4;Loop through some array to get information abouteach field to be added. Create fields and set theirattributes....mfield.InsertChild(fieldtoinsert = trim,row = i, column = 1);mfield.InsertChild(fieldtoinsert = efields[j],row = i, column = 2);endfor;/* get rid of extraneous rows */mfield.CollapsePolicy = CP_ROWS;For more information about the CollapsePolicy attribute of the MatrixFieldsystem class, see the Language Reference Guide online help.How You Can Create Dynamic Table Fields and Table Field ColumnsYou can create table fields dynamically in the same way as other compositefields, or you can add new columns to an existing table field (so long as itsunderlying array has not been declared in OpenROAD Workbench).To add or remove columns dynamically from a table field created inWorkbench, the variable for the table field must not be declared until runtime.When you create the table field, set the Variable Declared property to off. Atruntime, add or remove the requisite columns. After the table field containsonly the desired columns, declare an array variable for the table field with theDeclareData method of the ActiveField system class.The following section describes the process of dynamically adding columns to atable field. For a discussion of dynamically removing table field columns, seeHow You Can Remove Columns from a Table Field (see page 379). For adiscussion of dynamically declaring the array variable for the table field, seeHow You Can Declare a Composite Field's Array Variable Dynamically (seepage 380).376 Programming Guide