.NET/ASP.NET/C#/VB.NET PDF Document SDK

You ll use this to acquire references to both the Session and the Handler Next you check to see if the Handler implements the ISessionCounter interface This is how you can be sure the requested page is one you should track to see how many session variables have been created for it Let s take a look at the definition of this sample interface..

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A relational database table is essentially a two-dimensional matrix with rows (records) and columns (fields). A primary key is a column that uniquely identifies each row, and that means you cannot store the same value in a primary key column of any two records (so it is also a unique key). The primary key is usually a single numeric column, but it can also be composed as a set of columns, in which case it is called a composite primary key. Tables can be linked or related to one another using relationships. To set up a relationship, you need foreign keys, which are columns that store primary key values in a host table. For instance, in a one-to-one relationship, a record in table A can be associated with a record in table B by A containing a foreign key to B s primary key column, or vice versa, or both, depending on the navigability of the relationship. A one-to-one relationship is rare because it makes more sense to merge the two tables, unless the foreign key is allowed to be null. On the other hand, one-to-many (1..*) relationships are ubiquitous, allowing records in table A to be associated with multiple records in table B. For instance, a Customers table is likely to be associated with an Orders table this way, allowing each customer to have multiple orders. This can be modeled by storing a foreign key in Orders that refers to a Customers primary key. By moving two (or more) foreign keys in a separate so-called association table, we obtain a many-to-many relationship between those tables. Referential integrity refers to the fact that only valid primary key values are allowed in a foreign key column.

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public interface ISessionCounter { int SessionVarCount { get; set; } }

for i in 1..10000 loop l_varray_of_numbers( i ) := i; end loop; insert into number_varray_table values( l_varray_of_numbers ); end; /

Table 16-1 shows some of the most common database engines, all of which can be used from F# and .NET.

PL/SQLprocedure successfully completed. benchmark@ORA10G> commit; Commit complete. benchmark@ORA10G> select count(*) varray_num_of_rows from number_varray_table t, table( t.varray_column) n; VARRAY_NUM_OF_ROWS -----------------10000 The class BenchmarkCollectionRetrievalMethods extends the class JBenchmark to compare selecting the 10,000 elements of the varray using the various methods with and without autobuffering and auto-indexing. The class takes three arguments. The first is the database service name to which you connect, the second is a flag value (true or false) that sets the automatic buffering mode, and the third is a flag value (true or false) that sets the automatic indexing mode. /** This program compares the following three approaches * of retrieving array elements (after you have retrieved * the ARRAY object from the database) with and without * auto-indexing and auto-buffering on. * 1. Using getArray() * 2. Using getOracleArray() * 3. Using getResultSet() * COMPATIBLITY NOTE: * runs successfully against 9.2.0.1.0 and 10.1.0.2.0 */ import java.sql.SQLException; import java.sql.Connection; import java.sql.PreparedStatement; import java.sql.ResultSet; import oracle.sql.ARRAY; import oracle.sql.Datum; import book.util.JDBCUtil; import book.util.JBenchmark; class BenchmarkCollectionRetrievalMethods extends JBenchmark {

Open source database engine Small, embeddable, zero-configuration SQL database engine Based on Borland Interbase Reliable and popular database Reliable database engine One of the most popular enterprise database engines Microsoft s main database engine Free and easy-to-use version of SQL Server Mobile database engine