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XML support is one of the hottest new features of SQL Server 2000. Two major areas for the use of XML are the publishing of database information and B2B exchange of information. SQL Server 2000 contains tools that are ideal for quick development of XML applications. The For XML clause of the Select statement can be used to accelerate development and reduce the development costs of XML applications. The flexibility of SQL Server s Explicit mode allows development of very complex XML documents. The power of the OpenXML statement allows Transact-SQL developers to access information stored in XML documents. When the hype around XML settles down, Transact-SQL developers like you will be faced with real world problems associated with XML support in SQL Server 2000. At the time of this writing, the performance of XML document generation and parsing is unknown. It is also debatable whether it is better (that is, faster) to perform conversions to XML documents in SQL Server (which does not scale-out as well as middleware servers with COM components) or to use DOM or SAX in the middle layer to achieve the same effect. Transact-SQL developers will be faced with a steep learning curve in order to utilize this new technology. XML documents are generated in components that are simply black boxes without much information that can be used to verify their integrity, and therefore design and debugging of XML documents and applications is not that simple. Later releases of SQL Server will target features for updating information in the database through HTTP (UpdateGrams), massive import and export of XML documents (Bulk XML), and SOAP support (Simple Object Access Protocol a lightweight protocol for exchanging messages and remote procedure calls).

After SQL Server puts result sets into a network output buffer that is equal in size to the configured packet size, the Net-Library dispatches the buffer to the client. The first packet is sent as soon as the network output buffer (the write buffer) is full or, if an entire result set fits in one packet, when the batch is completed. In some exceptional operations such as one that provides progress information for database dumping or provides database consistency checker (DBCC) messages the output buffer is flushed and sent even before it is full or before the batch completes.

Enterprise Manager contains a tool for displaying and editing error messages. To start it, click a server node and then choose Tools | Manage SQL Server Messages.

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1. Create a stored procedure to return an element-centric XML document and schema with information about a specified Order. Associated tables are shown in the following diagram:

2. Create a stored procedure to return an XML document based on the content of the Order, OrderItem, and Equipment tables with the following structure:

<Order oid="1" OrderDate="1999-01-10T00:00:00"> <OrderItem id="2" InventoryId="5"> <Equipment EquipmentId="1" Make="Toshiba" Model="Portege 7020CT"/> </OrderItem> <OrderItem id="5" InventoryId="8"> <Equipment EquipmentId="5" Make="Bang & Olafson" Model="V4000"/> </OrderItem> </Order> <Order oid="6" OrderDate="2000-02-02T00:00:00">

12:

<OrderItem id="10" InventoryId="6"> <Equipment EquipmentId="6" Make="NEC" Model="V90"/> </OrderItem> <OrderItem id="11" InventoryId="25"> <Equipment EquipmentId="1" Make="Toshiba" Model="Portege 7020CT"/> </OrderItem> <OrderItem id="12" InventoryId="29"> <Equipment EquipmentId="35" Make="NEC" Model="Multisync III"/> </OrderItem> <OrderItem id="13" InventoryId="27"> <Equipment EquipmentId="34" Make="Toshiba" Model="Portege 7030CT"/> </OrderItem> </Order> <Order oid="7" OrderDate="2000-03-03T00:00:00"/> ...

3. Create a stored procedure that receives Order information in the form of an XML message, parses it, and stores it in tables.

Since T-SQL is so laconic (critics may say feature poor), development DBAs commonly express themselves in a very concise manner. DBAs frequently write ad hoc scripts for one-time use or manual execution, and they thus neglect the need for consistent error handling. Logic that is fine in standard languages like Visual Basic or C frequently does not work in T-SQL. For example, an error may occur in T-SQL, but if T-SQL does not consider it fatal, processing will continue. Also, if the error is fatal, all processing will stop. The process does not react: it is just killed.

n this appendix, you will find three tables that provide an overview of the datatypes in use in SQL Server 2000. Table A-1 lists all Transact-SQL datatypes, their synonyms, their most important attributes (range and size), as well as sample constants. Table A-2 lists XML datatypes, and Table A-3 provides a mapping between Transact-SQL and XML datatypes.

Character Strings Character string Variable-length character string 1 to 8,000

1 to 8,000

1 to 8,000

'D12-D13A36' 'Toronto' 'SQL Server'

Appendix A:

procedures are still very important, since Enterprise Manager uses the same system stored procedures, through SQL-DMO, behind the scenes.

Unicode Character Strings Unicode character string 1 to 4,000 2 to 8,000

2:

Nchar (national character) (national char) Variable-length Unicode character string 1 to 4,000

Nvarchar (national character varying) (national char varying) Long variable-length Unicode large character

2 to 8,000

Ntext (national text)

SQL-DMO stands for SQL Distributed Management Objects. It is a collection of objects designed to manage the SQL Server environment. You can use it to create your own Enterprise Manager or automate repetitive tasks. It is interesting that it does not support the return of a recordset to the caller. You should use other objects (such as ADO) to achieve this result.

N'SQL Server'

Date and Time Date and time Small date and time 1-Jan-1753 to 31-Dec-9999; precision: 3ms 1-Jan-1900 to 6-Jun-2079; precision: 1min 8 4 '6/27/1998 10:20:17.31' 'Oct 30, 1993 14:30'

Table A-1.

63 9,223,372,036,854,775,807 ( 2 )

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