zxing barcode generator example c# Part 6: Excel and the Outside World: Collaborating Made Easy in Visual C#.NET

Making Quick Response Code in Visual C#.NET Part 6: Excel and the Outside World: Collaborating Made Easy

Part 6: Excel and the Outside World: Collaborating Made Easy
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Introducing ADO
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Connecting to Different Database Management Systems
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The ConnectionString property is the most important property in the Connection object. The exact information in the connection string varies depending on the type of database you want to use. Connection strings are composed of a series of keywords and values separated by semicolons that provide the information necessary to locate the data provider and the database, along with any security information that might be required.
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Connecting to Access Databases
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Access databases rarely require little more than the name of the provider and the location of the database file in a connection string, like this:
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Provider=Microsoft.Jet.OLEDB.4.0;Data Source=C:\Excel2k3\Customer.mdb
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The Provider keyword selects the data provider for Access. For Access 2000 and newer databases, you should use the Microsoft.Jet.OLEDB.4.0 provider. Older Access databases might require this provider: Microsoft.Jet.OLEDB.3.51. Note The database engine typically used to power an Access database is known as Microsoft Jet. In addition to Access, several other products rely on the Jet database engine. However, because most people access Jet only through Access, it s common to refer to the database engine as Access as well. The Data Source keyword points to the location of the database on disk. Typically, this is a file path as shown in the earlier example, although it can reference a file using a file share format (\\athena\d\Excel2k3\Customer.mdb).
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Connecting to SQL Server Databases
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Connecting to SQL Server databases involves a somewhat more complicated connection string, although it s not as bad as you might expect.
Provider=SQLOLEDB.1;Data Source=athena.justpc.com; Initial Catalog=Music;User ID=Wayne;Password=TopSecret
The Provider keyword references SQLOLEDB.1, which is the SQL Server data provider. The Data Source keyword points to the database server that you want to access, and the Initial Catalog keyword indicates the name of the database on the particular database server that you want to open.
Part 6: Excel and the Outside World: Collaborating Made Easy
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Microsoft Office Excel 2003 Programming Inside Out Finally, the User ID and Password keywords present authentication information to the database server. If you wish to use your Windows authentication information the User ID that you gave when you logged onto Windows you can replace the User Id and Password keywords with the Integrated Security keyword, as in the following connection string:
Provider=SQLOLEDB.1;Data Source=athena.justpc.com; Initial Catalog=Music;Integrated Security=SSPI
Connecting to Other Databases
As long as you can find the proper data provider you can connect to many different types of databases. The main requirement is that the database supports OLE DB. Some of these databases and their providers are listed in Table 23-2.
Table 23-2.
Other OLE DB Data Providers
Data Provider(s)
IBM OLE DB Provider for DB2 Microsoft OLE DB Provider for Oracle Oracle Provider for OLE DB
Database
DB2 Oracle
In case the database you wish to use doesn t support OLE DB, but supports only ODBC, Microsoft includes a special data provider named Microsoft OLE DB Provider for ODBC drivers, which translates OLE DB calls into ODBC. However, you should use this provider only if you can t find an OLE DB provider because performance will suffer.
Using the Errors Collection
The Errors collection contains information about the errors that occur while executing a database command. Because it s quite possible that one error might trigger several others when executing a command, you can t always rely on the VBA Err object to reveal the true cause of the error. Therefore, the ADO Errors collection contains the full set of errors that occur while executing a command. (See Table 23-3.)
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Table 23-3.
Key Properties and Methods of the Errors Collection
Description
Method: Removes all the items from the collection. Property: Returns the number of items in the collection. Property: returns the Error object at the location specified by index.
Property/Method
Clear Count Item(index)
Part 6: Excel and the Outside World: Collaborating Made Easy
Introducing ADO
Clearing the Err Even though you can t rely on the Err object for all the details about an error, you can rely on the Err object to identify that an error has occurred. Just remember to use the Clear method to remove any previous information in the Err object before you execute your database request.
The Errors collection object is a typical collection object containing a Count property and an Item property that returns an Error object. You can use a For Each loop to process all the items in the collection, and then use the Clear method to erase all the Error objects in the col lection. Note The Errors collection is populated only when an error occurs. Use the Clear method before you execute a command to avoid detecting an error that has already been handled.
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