Tutorial: Creating A Multi-User Network Application Tutorial: Creating A FoxPro Multi-User Application Dr. Hicks Computer Science Department Trinity University Background Information & Other Tutorials For purposes of this tutorial, we shall start with the single user application created in the following tutorial. 1] Our RestaruantApp still resides in folder. (See Below!) 2] The Project may be seen below: Open The Database & Tables Exclusively 1] By default the Use command opens the database in exclusive mode.

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A second user may not open either the database or the table. Note the exclusive on the status bar. Open Database Rest Use Data Rest Order Name Open The Database & Tables Shared 1] Let us now attempt to open database Rest and table Rest simultaneously on two foxpro appplications. These applications my be on two different computers; they may also be on the same computer as illustrated below. Open Database Rest Shared Use Data Rest Shared Order Name 2] No longer does it say exclusive at the bottom of the status bar. The active record on both applications is record 1 of 54. Any function or form that enables the user to alter a record automatically lock the record as soon as a change is initiated.

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Edit and Change are two such functions. In the screen capture below, The top user is going to and a 2 is added to the end of the restaurant name; you can see Record Locked in the status bar as soon as the change is initiated. Once a user locks the record while making a change, it shall stay locked until the user moves to the next record.(See Below!) 3] Fortunately, locking the record does not prevent the other users from searching,running reports, running labels, examining data, or selection type queries.

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As you can see below, the bottom user can attempt to edit the same record and shall be successful until he/she attempts to make a change. (See Below!) 4] When the bottom user attempts to add a 2 to the end of the city Odessa, he/she gets a message Attempting To Lock. Press Esc To Cancel. As soon as the top exits or moves on to another record, the bottom user will get a lock and be able to make his/her change. Really 'klugy' at this stage.

(See Below!) 5] In the screen capture below, the top user finished editing record 1 and closed the edit window; the bottom user received a lock on record 1 and is able to make his/her change to Odessa. (See Below!) 6] Forms only compound these problems! Two Form Modes - Edit Mode & Normal Mode 1] There are two basic modes.

• The Edit Mode shall lock the current database record and permit changes to that record. • Options within this mode shall be only Cancel & Save • The Normal Mode shall enable the user to • Options within this mode shall be all else ==> Next, Previous, Top, Bottom, Search, Print, Browse, Edit, Add, Delete, Exit, etc.

2] For educational purposes, let us add two temporary buttons to our Rest form. (See Below!) • The valid event for the Edit Mode button should be Do SetEditMode • The valid event for the Normal Mode button should be Do SetNormalMode Normal Mode Should Allow No Option To Change The Record Fields - Scatter Memvar Memo 1] It is customary to work with a copy of the data in the edit mode; this greatly facilitates the ease of canceling the process with no damage to the original data. Some databases, such as FoxPro, have the option to easily create a set of local variables which contain a copy of the information in the current record; this function is called Scatter in the x-base languages. In other database applications, such as Access, the programmer has to manually create and assign the needed local variables.