barcode scanner c# sample code Linking Access Tables in Microsoft Office

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Linking Access Tables
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Linking to tables in another Access database makes them available without your having to copy them into the active database Linking saves space and reduces the need to maintain redundant data Linking also ensures that you always have access to current information However, linking also means that the data is dependent on an object that resides in another environment, where it can be renamed, moved, or deleted
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C AUTION If you re linking to a table in a database that is password-protected, you must enter the
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correct password to continue When you enter the password, it s stored in an unencrypted form with the link information, and any user who can open your database can also open the linked, password-protected database See s 24 and 25 for more information about multiple users and security To link to a table in another Access database: 1 Open the destination database in this example, Police 2 To start the linking process, on the External Data tab s Import group, click the Access command
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E x c h a n g e D a t a b a s e O b j e c t s a n d Te x t
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3 In the Get External Data dialog box, select the database that you want to link to your active database We are using the Northwind Traders database as the source in this example 4 Choose the second option, Link to the Data Source by Creating a Linked Table, and click OK The Link Tables dialog box opens, showing only a Tables tab, because tables are the only Access objects to which you can link
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PART IV
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5 Select one or more of the available tables and click OK
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Exchange Data with Others
In this example, the Suppliers table is linked to the Police database, as shown by the arrow next to the table icon
NOTE If you link two related tables from the same database, the relationship is retained
Importing from or Linking to Other Data Sources
Access can import data or link to existing tables in other database management systems Access provides specific recognition of some database table formats Acquiring data and other objects from foreign databases is not much different from importing or linking Access databases You can both import and link dBASE III, IV, 5, and 7 files as well as Paradox 3x, 4x, 50, and 80 files For version dBASE 7 and Paradox 80, you need the updated ISAM drivers available from Microsoft Technical Support
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E x c h a n g e D a t a b a s e O b j e c t s a n d Te x t
You can also import and link data from ODBC data sources such as the Microsoft SQL Server and Visual FoxPro You will need a connection to the appropriate ODBC data source and the data source defined Data types are generally compatible among these database management systems, although they are not labeled consistently For example, dBASE Character and Paradox Alphanumeric data types both become Text fields in Access dBASE Float and Paradox Currency types become Number fields in Access with the Field Size property set to Double dBASE calls Yes/No fields Logical
Using Data from dBASE or Paradox
Importing a dBASE table or a Paradox file into an Access database is similar to importing a table from an Access database For example, to import a dBASE table: 1 On the External Data tab s Import group, click the More command, and select dBASE File from the context menu
PART IV
2 In the Get External Data dialog box, locate and select the file that you want to import Groupsdbf, in this example and click Import After the table is imported, it looks and behaves just like an Access table You can use the same procedure to import Paradox files Another approach to making use of data from a dBASE or Paradox database is to use the Link Tables operation by choosing the linking option in the Get External Data dialog box When you import a dBASE file, Access creates a table with the same name as the dbf file and imports the data Conversely, when you link to a dBASE file, Access also requires
Part IV:
Exchange Data with Others
that the associated dBASE index files be linked If you choose to link to a dBASE file, the Select Index Files dialog box may appear, in which you can choose the indexes (ndx and mdx files) that are associated with the dbf file If there are no index files, click Cancel and proceed with the link operation If you select one or more index files, the Select Unique Record Identifier dialog box prompts you to select the corresponding index field Your index must have a unique value for each record, or difficulties might occur when you try to update records After importing or linking a dBASE file, you can set field properties for the table If you import a file with no primary index, you can set the index in Access When you update the file with Access, the index is also automatically updated If you use dBASE to update the file, you must also update the corresponding index in dBASE before trying to open the file in Access Figure 22-3 shows a linked dBASE file in the Database window by displaying the arrow and a dBASE icon indicating that Groups is a linked dBASE file
FIGURE 22-3
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