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3. Copy the 8 folder from the companion CD to the root of the C drive. Then create an XML schema collection called LogRecordSchema. Your code might look like the following:
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USE TK4318 GO declare @schema XML SELECT @schema = c FROM OPENROWSET ( BULK 'C:\8\Lesson 1\logRecordSchema.xsd', SINGLE_BLOB) AS TEMP(c) CREATE XML SCHEMA COLLECTION LogRecordSchema AS @schema
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4. Load the XML schema from the .xsd file in the C:\8 folder. The following code shows the LogRecordSchema XML schema:
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< xml version="1.0" encoding="utf-8" > <xsd:schema xmlns:xsd="http://www.w3.org/2001/XMLSchema"> <xsd:element name="logRecord" type="logRecordType" /> <xsd:simpleType name="flagEnum"> <xsd:restriction base="xsd:string"> <xsd:enumeration value="warning" /> <xsd:enumeration value="information" /> <xsd:enumeration value="failure" /> <xsd:enumeration value="custom" /> </xsd:restriction> </xsd:simpleType> <xsd:simpleType name="eventEnum"> <xsd:restriction base="xsd:string"> <xsd:enumeration value="appStart"/> <xsd:enumeration value="appClose"/> <xsd:enumeration value="logIn"/> <xsd:enumeration value="logOut"/> </xsd:restriction> </xsd:simpleType>
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Lesson 1: Working with XML Structures
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<xsd:complexType name="logRecordType"> <xsd:choice maxOccurs="unbounded"> <xsd:element name="information" type="informationType"/> <xsd:element name="error" type="errorType"/> <xsd:element name="post" type="postType"/> </xsd:choice> <xsd:attribute name="machine" type="xsd:string" /> <xsd:attribute name="timestamp" type="xsd:dateTime" /> </xsd:complexType> <xsd:complexType name="postType"> <xsd:sequence> <xsd:element name="moreInformation" type="xsd:string" maxOccurs="1" minOccurs="0"/> </xsd:sequence> <xsd:attribute name="eventType" type="eventEnum"/> </xsd:complexType> <xsd:complexType name="informationType"> <xsd:sequence> <xsd:element name="message" type="xsd:string" /> </xsd:sequence> <xsd:attribute name="flag" type="flagEnum" /> </xsd:complexType> <xsd:complexType name="errorType"> <xsd:sequence> <xsd:element name="message" type="xsd:string" /> <xsd:element name="module" type="xsd:string" /> </xsd:sequence> <xsd:attribute name="number" type="xsd:int" /> </xsd:complexType> </xsd:schema>
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5. Issue a CREATE TABLE statement to create a new table called UniversalLog that contains the following columns:
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ID: INT data type. Set it as an identity column. Do not accept null values. LogDateTime: DATETIME data type. Default to current date and time. Do not accept null values. ApplicationName: NVARCHAR (50) data type. Do not accept null values. LogRecord: XML data type. Accept null values and bind the column to the LogRecordSchema schema collection.
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Your code should look like this:
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CREATE TABLE UniversalLog ( ID INT IDENTITY(1,1) NOT NULL, LogDateTime DATETIME NOT NULL CONSTRAINT [DF_UniversalLog_LogDateTime] DEFAULT (GetDate()), ApplicationName NVARCHAR(50) NOT NULL, LogRecord XML(LogRecordSchema) NULL )
8
Managing XML Data
NOTE
Altering the LogRecord column
If you created the table first and then the XML schema collection, you can alter the column in the table to map it to the XML schema by using the following code:
ALTER TABLE UniversalLog ALTER COLUMN LogRecord XML (LogRecordSchema)
Practice 2: Insert Log Records into the UniversalLog Table
In this exercise, you will insert XML data representing log records into the UniversalLog table you created in Practice 1. 1. If necessary, open SSMS and open a connection to SQL Server 2005. 2. Connect to the TK4318 database you created in Practice 1. 3. Open the LogRecordsXML.sql file in the C:\8 folder. The file contains the following INSERT statements:
INSERT UniversalLog(ApplicationName, LogRecord) VALUES ('SalesApp', '<logRecord machine="server1" timestamp="2000-01-12T12:13:14Z"/>') INSERT UniversalLog(ApplicationName, LogRecord) VALUES ('SalesApp', '<logRecord machine="server1"><information/></logRecord>') INSERT UniversalLog(ID, ApplicationName, LogRecord) VALUES (1, 'SalesApp', '<logRecord machine="server1" timestamp="2000-01-12T12:13:14Z"> <post eventType="appStart"> <moreInformation>All Services starting</moreInformation> </post> </logRecord>') INSERT UniversalLog(ID,ApplicationName, LogRecord) VALUES (2, 'Inventory', '<logRecord machine="server2" timestamp="2000-01-13T12:13:14Z"> <post eventType="appStart"/> <information flag="warning"> <message>Duplicate IP address</message> </information> </logRecord>') INSERT UniversalLog(ID,ApplicationName, LogRecord) VALUES (3, 'HR', '<logRecord machine="server1" timestamp="2000-01-14T12:13:14Z"> <error number="1001"> <message>The user does not have enough permissions to execute query</message> <module>DataAccessLayer</module> </error> </logRecord>')
Lesson 1: Working with XML Structures
INSERT UniversalLog(ID,ApplicationName, LogRecord) VALUES (4, 'CustomerService', '<logRecord machine="server2" timestamp="2000-01-15T12:13:14Z"> <post eventType="logOut"/> <information flag="custom"> <message>User must change password on next login</message> </information> </logRecord>') INSERT UniversalLog(ID,ApplicationName, LogRecord) VALUES (5, 'HoursReport', '<logRecord machine="server2" timestamp="2000-01-11T12:13:14Z"> <information flag="failure"> <message>Hard Disk with ID #87230283 is not responding</message> </information> <error number="18763"> <message>Application can not start</message> <module>AppLoader</module> </error> <post eventType="appStart"/> </logRecord>')
4. Execute each of the INSERT code segments in the file in turn by selecting the code and pressing F5 to execute. The first two INSERT statements are meant to return validation errors because the XML data does not conform to the XML schema collection. Pay attention to the messages SQL Server returns.
Lesson Summary
The XML data-representation format is used to represent semistructured and unstructured data that you cannot represent relationally. SQL Server 2005 provides a new XML data type for native storage of XML documents and fragments in the relational database. XML data can be typed and untyped. Typed XML is constrained by the declarations in an XML schema registered in an XML schema collection.
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