barcode scanner c# sample code Sharing with Multiple Users in Microsoft Office

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Sharing with Multiple Users
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FIGURE 24-2
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Splitting the database into front-end and back-end
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The database containing the tables is called the back-end database and the one containing the other objects is the front-end database The front-end database contains links to the tables in the back-end database Access provides the Database Splitter Wizard to separate the tables from the rest of the database Figure 24-2 illustrates the front-end/back-end models for sharing an Access database All tables are stored on the network server The application workstations store all of the other objects queries, forms, reports, macros, and modules
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TIP Undoing what the Database Splitter Wizard does isn t easy, so be sure to make a backup copy of
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the database before you attempt to split it To split a database into the front- and back-end elements, do the following: 1 Open the database and make sure no objects in the database are open On the Database Tools tab s Move Data group, click the Access Database command The Database Splitter Wizard opens with a message describing the process (Figure 24-3)
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Starting the Database Splitter
2 After reading the message, click Split Database The next dialog box lets you specify where to place the back-end database
NOTE If you are using Windows XP, this dialog box looks quite different, but it will do the same thing
3 Click the Browse Folders down arrow and the dialog box shows more information Look for the network server 4 Click the Folders down arrow on the left pane and choose Network in the list (Figure 24-4) 5 Select the network server and enter a filename for the back-end database, or accept the default name: the name of the current database with _be added 6 Click Split When the process is completed, a message appears, announcing the successful split Click OK to close the message box
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Sharing with Multiple Users
FIGURE 24-4 Choosing the network server
Splitting a large database might take awhile The wizard is deleting the tables from the current database, creating a new database with the tables, and then linking the current database to the new back-end tables When you look at the list of tables in the Navigation Pane of the current database after splitting, you can see that the tables listed are all links to another database (Figure 24-5) by the link icons next to the names in the list If you open the new back-end database, you can see all the tables listed in the tables group in the Navigation Pane, but all the other groups are empty To customize the distributed database environment further, you can reduce network traffic even more by moving relatively static tables, such as lookup tables containing data that doesn t change often, back to the front-end databases If the data in the lookup table changes, you can make the changes in the back-end version and alert the users to copy the data to their own lookup tables Temporary tables should also be stored locally to prevent conflicts and reduce network traffic If you need to change the link to any of the back-end tables, on the Database Tools tab s Database Tools group, click the Linked Table Manager command In the Linked Table Manager dialog box, choose the affected tables and check the Always Prompt for New Location check
PART IV
Part IV:
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FIGURE 24-5
Tables are linked to the back-end database
box (Figure 24-6) Then, when you refresh the link to the table, you will have the opportunity of changing the location of the linked table in the standard file location dialog box
C AUTION When you link tables, you can leave a security hole, unless you secure both the front-end
and the back-end tables
Preventing Exclusive Access
When multiple users are sharing a database, competition for data access can occur If one user opens the database with exclusive access, no other user can work with it at the same time To prevent, or at least discourage, this from happening, Click the Microsoft Office button and choose Access Options to open the Access Options dialog box, and on the Advanced page, set the Default Open Mode to Shared Then instruct all the users not to open the database in Exclusive mode See 25 for information about including security in a multiple-user environment
24:
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