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CHAPTER 10 MANAGED PROVIDERS OF DATA ACCESS
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Table 10-1. Some Managed Providers That Are Available for Different Vendor s Databases
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Provider Name
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Vendor
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Description
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Provides access to Microsoft SQL Server, version 6.5 and later. Provides a backwards-compatibility layer for using legacy OLEDB drivers. Need to use this one to work with MS Access or FoxPro, as no native provider is available for Jet. Provides backwards compatibility to those databases supporting ODBC drivers. Provides access to Oracle data sources. Built on top of the Oracle client libraries, which must be installed on the system using this provider. Access to Borland s Interbase relational database product. Access to the open source implementation of mySQL.
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ODBC Oracle
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Interbase mySQL
Borland Source Forge Open source Others Oracle
Oracle
Provides access to Oracle data sources. Built on top of the Oracle client libraries, which must be installed on the system using this provider.
These implementations all use the same set of interfaces, and are, therefore, similar to one another.
System.Data Namespace
The core namespace of the Framework class library for data access is System.Data. Table 10-2 is a survey of the namespaces contained within this namespace. Table 10-2. Survey of Namespaces from the System.Data Assembly
Namespace
System.Data
Meaning in Life
This is the core namespace of ADO .NET. It defines types that represent tables, rows, columns, constraints, and the almighty DataSet. Be aware that this namespace does not define types to connect to a data source. Rather, it defines the interfaces implemented by specific Managed Providers and the types that represent the data itself. This namespace defines the types that allow you to connect to an OLE DB-compliant data source, submit SQL queries, and fill DataSets. These are the types you must use to talk to Access or FoxPro data sources. They are also provided for backwards compatibility to vendors that do not have a native provider available. This namespace defines the types that allow you to connect to an ODBC providers of data access. These types are provided for backwards compatibility and will usually not perform as well as a native provider.
System.Data.OleDb
System.Data.ODBC
CHAPTER 10 MANAGED PROVIDERS OF DATA ACCESS
Namespace
System.Data.SqlClient
Meaning in Life
This namespace defines the types that constitute the SQL Managed Provider. Using these types, you can talk directly to Microsoft SQL Server and avoid the level of indirection associated with the OleDb equivalents. These are types to talk directly to Oracle8i and later databases. These types ship in a stand-alone assembly. You must also have MDAC 2.6 and Oracle Client installed. There is also a native Managed Provider available directly from Oracle. Provides access to SQL Server CE Edition, which is part of the .NET Compact Framework, and is designed to run on hand-held devices.
System.Data.OracleClient
System.Data.SqlServerCe
In addition to the subnamespaces that are defined the in System.Data namespace, a number of types are also housed in the namespace (see Table 10-3). The core object from this namespace is the DataSet. The DataSet object can hold a collection of result sets in memory, providing random access to the data for sorting, filtering, and modifying the data. A number of types contained by the DataSet object are also defined in System.Data. Table 10-3. A Sampling of Types That Live in the System.Data Namespace System.Data Type
DataSet DataTableCollection DataTable DataRelationCollection DataRelation ForeignKeyConstraint UniqueConstraint
Meaning in Life
Represents an in-memory cache of data, which may consist of multiple related DataTables. The DataTableCollection type represents all the tables (DataTable types) for a particular DataSet. This collection represents all relationships (DataRelation types) between the tables in a DataSet. ForeignKeyConstraint represents an action restriction enforced on a set of columns in a primary key/foreign key relationship when a value is changed or deleted. The UniqueConstraint type represents a restriction on a set of columns in which all values must be unique. The ConstraintCollection represents all constraints (foreign key constraints, unique constraints) assigned to a given DataTable. Constraint represents a single constraint assigned to one or more DataColumns. DataColumnCollection represents all of the columns used by a DataTable. DataColumn represents a specific column in a DataTable. These types represent a collection of rows for a DataTable (DataRowCollection) and a specific row of data in a DataTable (DataRow). DataRowView allows you to carve out a predefined view from an existing row. The DataView type represents a customized view of a DataTable that can be used for sorting, filtering, searching, editing and navigation.
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