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A much more significant difference between the two tables shows up when you compare the indexes for the two tables. You can use the sys.indexes system view to return information about the indexes and storage mechanism associated with a table. The following pair of SELECT statements illustrates the syntax for doing this: The first SELECT statement and its result set show that the ProductCategory table has three indexes. The PK_ProductCategory_ProductCategoryID index serves as the primary key, and it is clustered meaning that rows are physically stored according to its values. Even in spite of these storage considerations, the rows do not automatically return in the order of the primary key column values. The second SELECT statement and its result set show that the MyCopy table has no indexes. The HEAP type description indicates this. This significant difference between the indexes for the two tables indicates that this is the source of the difference in row orders displayed previously.

You can search multiple columns or all full-text indexed columns at once without multiple CONTAINS predicates in the WHERE clause. Use the asterisk to specify that all possible columns are searched, or use a comma-delimited list in parentheses to specify a list of columns. Type in and execute the code in Listing 2-21, which demonstrates these techniques. Listing 2-21. Using Multiple Columns USE AdventureWorks2008; GO --1 SELECT FileName, DocumentSummary FROM Production.Document WHERE CONTAINS((DocumentSummary,Document),'maintain'); --2 SELECT FileName, DocumentSummary FROM Production.Document WHERE CONTAINS((DocumentSummary),'maintain') OR CONTAINS((Document),'maintain') --3 SELECT FileName, DocumentSummary FROM Production.Document WHERE CONTAINS(*,'maintain');

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which uses an ordinal index. Since you didn t rename the second data table (you could have done so with its TableName property), it was better to use the index rather than the name (customers1), since a change to the name in the Fill() call would require you to change it here, an unlikely thing to remember to do, if the case ever arose.

Note The difference in row orders and indexes for the ProductCategory and MyCopy tables is presented to reinforce the notion that you should always use an ORDER BY clause to ensure a specific order of rows in a result set. Of course, having an index for a column on which you plan to order rows can enhance the performance of your queries.

SELECT name 'Type name', type_desc 'Type description', is_primary_key FROM sys.indexes WHERE object_id = OBJECT_ID('Production.ProductCategory') Type name ------------------------------------PK_ProductCategory_ProductCategoryID AK_ProductCategory_Name AK_ProductCategory_rowguid Type description ---------------CLUSTERED NONCLUSTERED NONCLUSTERED is_primary_key -------------1 0 0

In the first example, PopDataSet (Listing 8-1), you saw how simple it is to get data into a dataset. The second example, FilterSort (Listing 8-2), was just a variation, demonstrating how multiple result sets are handled and how to filter and sort data tables. However, the two programs have one major difference. Did you notice it FilterSort doesn t explicitly open a connection! In fact, it s the first (but won t be the last) program you ve written that doesn t. Why doesn t it The answer is simple but very important. The Fill method automatically opens a connection if it s not open when Fill() is called. It then closes the connection after filling the dataset. However, if a connection is open when Fill() is called, it uses that connection and doesn t close it afterward. So, although datasets are completely independent of databases (and connections), just because you re using a dataset doesn t mean you re running disconnected from a database. If you want to run disconnected, use datasets, but don t open connections before filling them (or, if a connection is open, close it first). Datasets in themselves don t imply either connected or disconnected operations.

The list of columns to be searched in query 1 is explicitly listed and contained within an inner set of parentheses. Query 2 is equivalent to query 1 by using two CONTAINS expressions, each searching a different column for the same term. By using the asterisk in query 3 within the CONTAINS expression, all columns with a full-text index are searched.

SELECT name 'Type name', type_desc 'Type description', is_primary_key FROM sys.indexes WHERE object_id = OBJECT_ID('MyCopy')

You left our standard conn.Close() in the finally block. Since Close() can be called without error on a closed connection, it presents no problems if called unnecessarily but definitely guarantees that the connection will be closed, whatever may happen in the try block.

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