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Table 18-1 SQL/XML Functions
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The results returned should look something like this:
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<ArtistCD> <Artist>BonnieRait</Artist> <PERF_ID>104</PERF_ID> <CD_NAME>Fundamental</CD_NAME> <IN_STOCK>22</IN_STOCK> </ArtistCD> <ArtistCD> <Artist>BonnieRait</Artist> <PERF_ID>104</PERF_ID> <CD_NAME>Longing in Their Hearts</CD_NAME> <IN_STOCK>18</IN_STOCK> </ArtistCD>
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Notice that the XML element names are taken from the column names, in uppercase with underscores as is customary in SQL. However, using the column alias, as I did for the PERF_NAME column, you can change the column names to just about anything you want.
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18:
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Working with XML Data
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SQL/XML Mapping Rule
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Thus far I have not discussed how SQL values are translated and represented as XML values and vice versa. The SQL standard describes in detail how SQL values can be mapped to and from XML values. This topic contains an overview of the SQL/XML mapping rules.
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Mappings from SQL to XML
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The mappings in this topic apply to translating data in SQL data types to XML. Mapping SQL Character Sets to Unicode Unicode is an industry standard that allows computer systems to consistently represent (encode) text characters expressed in most of the world s written languages. XML is often encoded as Unicode characters to allow for text in multiple languages. SQL character data is stored in whatever character set is specified when the table or database is created, and while many SQL implementations support Unicode, many other character sets can also be used. The SQL standard requires that each character in an SQL character set have a mapping to an equivalent Unicode character. Mapping SQL Identifiers to XML Names It is necessary to define a mapping of SQL identifiers, such as table and column names, to XML names because not all SQL identifiers are acceptable XML names. Characters that are not valid in XML names are converted to a sequence of hexadecimal digits derived from the Unicode encoding of the character, bracketed by an introductory underscore and lowercase x and a trailing underscore. For example, a colon (:) in an SQL identifier might be translated to _x003A_ in an XML name. Mapping SQL Data Types to XML Schema Data Types This is perhaps the most complicated of the mapping forms. For each SQL type or domain, the SQL implementation is required to provide a mapping to the appropriate XML schema type. Detailed mapping of standard SQL types to XML schema data types is provided in the standard in exhaustive detail. I summarize them in Table 18-2. Mapping Values of SQL Dat4a Types to Values of XML Schema Data Types For each SQL type or domain, with the exception of structured types and reference types, there is also a mapping of values for the type to the value space of the corresponding XML schema type. Null values are representing using either absence (skipping the element) or using the facet xsi:nil= true to explicitly set the null value. Mapping an SQL Table to an XML Document and an XML Schema Document The SQL standard defines a mapping of an SQL table to one or both of two documents: an XML schema document that describes the structure of the mapped XML, and either an XML document or a sequence of XML elements. This mapping applies only to base tables and viewed tables, and only columns visible to the database user can be mapped. The implementation may provide options for the following:
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Whether to map the table to a sequence of XML elements or as an XML document with a single root name derived from the table name. The target namespace of the XML schema to be mapped.
SQL: A Beginner s Guide
SQL Type
CHARACTER, CHARACTER VARYING, CHARACTER LARGE OBJECT
XML Schema Type
xs:string
Notes
The XML facet xs:length is used to specify length for fixed length strings. (A facet is an element used to define a property of another element.) Precision and scale are specified using XML facets xs:precision and xs:scale. This mapping is listed as implementation-defined, meaning it is optional. For precisions up to 24 binary digits (bits) and an exponent between -149 and 104 inclusive, xs:float is used; otherwise xs_double is used.
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