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For fixed-width specifications, you can define the field names, data types, start column, width, indexed properties, and whether or not to skip a field. You can identify the language in the Language combo box and the character set in the Code Page combo box. You can also specify the way Access recognizes date and time values and numeric fractions. (For example, for a file coming from a non-U.S. machine, the Date Order value might be DMY, and the Decimal Symbol character might be a comma.) Click the Save As button to save your specification, and give it a name. You can also click the Specs button to load and edit other previously saved specifications. The loaded specification is the one Access uses to import the current file.
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For details about modifying your table design, see 5, Modifying Your Table Design. See Table 5-3 in 5 for data conversion limitations. 6
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Part 2: Building a Microsoft Access Desktop Application
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Part 1: Part Title
Microsoft Office Access 2003 Inside Out
Modifying Imported Tables
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When you import data from an external source, Microsoft Access often has to use default data types or lengths that can accommodate all the incoming data. You will then need to correct these default settings for your needs. For example, Access assigns a maximum length of 255 characters to text data imported from a spreadsheet or a text file. Even when the source of the data is another database, Access might choose numeric data types that can accept the data but that might not be correct. For example, numeric data in dBASE might be of the Integer type, but Access stores all numeric data from dBASE with a Field Size setting of Double. Unless you re importing data from an SQL or Paradox database that has a primary key defined, Access does not define a primary key in the new table, so you must do that yourself. Also, if you did not include field names when importing a text or spreadsheet file, you ll probably want to enter meaningful names in the resulting table.
Linking Files
You can link tables from other Microsoft Access databases whether the other databases are local or on a network and work with the data as if these tables were defined in your current Access database. If you want to work with data stored in another database format supported by Access (dBASE, Paradox, or any SQL database that supports ODBC, including Microsoft FoxPro), you can link the data instead of importing it. Note Although you can import queries, forms, reports, macros, and modules from another
Access database file, you cannot link these types of objects. Any object that Access needs to run (rather than simply be a container for data) must be in your local database.
In most cases, you can read data, insert new records, delete records, or change data just as if the linked file were an Access table in your database. You can also link text and spreadsheet format data so that you can process it with queries, forms, and reports in your Access database. You can update and insert new rows in spreadsheets, but you can t delete rows. You can only read the data in linked text files. This ability to link data is especially important when you need to access data on a host computer or share data from your application with many other users. Note Microsoft Access 2003 supports linking to dBASE or Paradox versions 5.0 and earlier, and it allows full update if it can find the associated index files. If you need to work with later versions, you must install the Borland Database Engine (BDE).
Part 2: Building a Microsoft Access Desktop Application
Part 1: Part Title
Importing and Linking Data
Security Considerations
If you attempt to link a file or a table from a database system that is protected, Access asks you for a password. If the security information you supply is correct and Access successfully links the secured data, Access optionally stores the security information with the linked table entry so that you do not have to enter this information each time you or your application opens the table. Access stores this information in the hidden Connect property of a linked table, so a knowledgeable person might be able to retrieve it by writing code to examine this property. Therefore, if you have linked sensitive information to your Access database and have supplied security information, you should consider encrypting your database. Consult 30, Securing Your Database, for information about securing and encrypting your Access database. If you are linking your database to Microsoft SQL Server tables and are using Microsoft Windows domain security, you can set options in SQL Server to accept the Windows domain user ID if the user logs on correctly to the network. Therefore, you won t need to store security information with the link. If your server contains particularly sensitive information, you can disable this option to guard against unauthorized access from logged on but unattended network workstations.
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