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Of all the ADO.NET namespaces, System.Data is the lowest common denominator. You simply cannot build ADO.NET applications without specifying this namespace in your data access applications. This namespace contains types that are shared among all ADO.NET data providers, regardless of the underlying data store. In addition to a number of database-centric exceptions (NoNullAllowedException, RowNotInTableException, MissingPrimaryKeyException, and the like), System.Data contains types that represent various database primitives (tables, rows, columns, constraints, etc.), as well as the common interfaces implemented by data provider objects. Table 22-5 lists some of the core types to be aware of. Table 22-5. Core Members of the System.Data Namespace

Represents a constraint for a given DataColumn object Represents a single column within a DataTable object Represents a parent/child relationship between two DataTable objects Represents a single row within a DataTable object Represents an in-memory cache of data consisting of any number of interrelated DataTable objects Represents a tabular block of in-memory data Allows you to treat a DataTable as a fire-hose cursor (forward only, read-only data access); new in .NET 2.0

Represents a customized view of a DataTable for sorting, filtering, searching, editing, and navigation Defines the core behavior of a data adapter object Defines the core behavior of a parameter object Defines the core behavior of a data reader object Defines the core behavior of a command object Extends IDataAdapter to provide additional functionality of a data adapter object Defines the core behavior of a transaction object

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Used to specify an image (via URL) to be used as the list item marker. Value: <url> | none Initial value: none Inherited: Yes Applies to: Elements with a display value of list-item Supported by: Firefox, Safari, Opera, Internet Explorer

Later in this chapter, you will get to know the role of the DataSet and its related cohorts (DataTable, DataRelation, DataRow, etc.). However, your next task is to examine the core interfaces of System.Data at a high level, to better understand the common functionality offered by any data provider. You will learn specific details throughout this chapter, so for the time being let s simply focus on the overall behavior of each interface type.

Polymorphism is the ability of objects of different types to respond to calls to methods with the same name Imagine creating a cEmployee class and a PurchaseOrder class that both make database calls Each class can contain a SaveData method Each will perform its function differently, yet the functionality for each is the same We don t need to know how either one does its job, which brings us back to encapsulation! OOP purists would tell you that this is an incomplete implementation of polymorphism, and they would be correct True polymorphism should also include the ability to overload methods This means that an object can have more than one implementation of a method.

First up is the IDbConnection type, which is implemented by a data provider s connection object. This interface defines a set of members used to configure a connection to a specific data store, and it also allows you to obtain the data provider s transactional object. Here is the formal definition of IDbConnection: public interface IDbConnection : IDisposable { string ConnectionString { get; set; } int ConnectionTimeout { get; } string Database { get; } ConnectionState State { get; } IDbTransaction BeginTransaction(); IDbTransaction BeginTransaction(IsolationLevel il); void ChangeDatabase(string databaseName); void Close(); IDbCommand CreateCommand(); void Open(); }

As you can see, the overloaded BeginTransaction() method defined by IDbConnection provides access to the provider s transaction object. Using the members defined by IDbTransaction, you are able to programmatically interact with a transactional session and the underlying data store: public interface IDbTransaction : IDisposable { IDbConnection Connection { get; } IsolationLevel IsolationLevel { get; } void Commit(); void Rollback(); }

Next, we have the IDbCommand interface, which will be implemented by a data provider s command object. Like other data access object models, command objects allow programmatic manipulation of SQL statements, stored procedures, and parameterized queries. In addition, command objects provide access to the data provider s data reader type via the overloaded ExecuteReader() method: public interface IDbCommand : IDisposable { string CommandText { get; set; } int CommandTimeout { get; set; } CommandType CommandType { get; set; } IDbConnection Connection { get; set; } IDataParameterCollection Parameters { get; } IDbTransaction Transaction { get; set; } UpdateRowSource UpdatedRowSource { get; set; } void Cancel(); IDbDataParameter CreateParameter(); int ExecuteNonQuery(); IDataReader ExecuteReader(); IDataReader ExecuteReader(CommandBehavior behavior); object ExecuteScalar(); void Prepare(); }

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