Programming Tool Box/SIMS_2.iso/demo/adevbx/readme.tx_/readme.tx

Text File | 1994-12-15 | 9.9 KB | 161 lines

        README FILE FOR ADE VBXs (Version 1.01)

     1. Installation

    . Be sure to add the ADE directory into the PATH statement of
      your AUTOEXEC.BAT file.

    . Add the command SHARE /L:500 to your AUTOEXEC.BAT file.

     2. Use  of the ADE VBXs

    . IMPORTANT WARNING! Altering the value of the QUERYSTATEMENT
      property at runtime DURING the execution of a fetch can corrupt
      memory, resulting in abnormal application termination with
      unpredictable effects upon your data. It is strongly suggested
      that you do NOT change this value (or in the case of an
      application, permit users to change this value) while a fetch is
      being executed.

    . A new property USERNAME has been added to those ADE VBXs that
      support queries. This property is designed to support those
      environments (such as SQL Server) which require a USERNAME be
      passed to the application for logon purposes.

    . Because attachment to servers is initiated as soon as you define
      the ADEDataSource, you must declare your username and password
      properties before you select your datasource.

    . You can reduce the time to load a form by setting QueryStatement
      property at run time. If the property is set at design time,
      the VBX will execute the query statement when the form is
      loaded.

    . ADEList and ADECombo now have query builders attached to them.
      The query builder can be used at design time by altering its
      QueryStatement property, the Setting box in the property window
       which displays ellipses(..). The Query builder will be displayed
       when you click on the ellipses. Always set the DataSource
      property first, as the query builder is disabled until the
       DataSource property is set.

    . ADECombo and ADEList are intended for queries with relatively
      small result set. If your query is likely to produce a very
       large answer set, use ADEData instead.

     . When the DataSource property is set, All ADE VBXes automatically
       query the available data source(s) and put them in the Setting
       list box. It is only possible to select a data source in the
       list.

    . When changing the style of a VBX, the properties window will be
       recreated and all the previous property settings will be lost.

    . ADEGrid has a runtime property called SelectedRow which contains
      the current record ID (i.e. the row number of the highlighted
      row on the grid) The property is read/write enabled, and can
      be assigned a value at runtime which (which would cause the
      row with a number matching the assigned value to become selected
      and thus highlighted). For example:

        ADEGrid1.SelectedRow = ADEGrid1.SelectedRow + 1

      will move the selected row to one "down" from the currently
      selected row (the equivilent of moving to the next record in a
      database).

    . The CLICK event of ADEGrid now passes the record ID of the
      selected row as a parameter (RowSelect). This parameter is NOT
      documented in either the help file or the user guide. This
      parameter can be very useful when you need to figure out which
      row the user has just clicked upon to select.

     Technical Support:

    If you have any technical question or comment, contact the Marasco
     Newton Group at [phone].


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