Getting Started with DB2 Express-C

286 Getting Started with DB2 Express-C
AS sql VARCHAR(40)
Listing 15.30 - An index on element name
The statement in Listing 15.31 creates an index on all elements name
CREATE INDEX idx3 ON customer(info)
GENERATE KEY USING
xmlpattern '//name'
AS sql VARCHAR(40);
Listing 15.31 - An index on all elements name
The statement in Listing 15.32 creates an index on all text nodes (all values). This is not
recommended, as it would be too expensive to maintain the index for update, delete and
insert operations, and the index would be too large.
CREATE INDEX idx4 ON customer(info)
GENERATE KEY USING
xmlpattern '//text()'
AS sql VARCHAR(40);
Listing 15.32 - An index on all text nodes (Not recommended)
15.4 Working with XML Schemas
DB2 allows you to insert an XML document into the database if it is well-formed. If it's not,
you will receive an error at insertion time. On the other hand, DB2 does not force you to
validate a XML document. If you wish to have an XML document validated, you have
several alternatives as we will discuss in this section.
15.4.1 Registering your XML Schemas
XML Schemas are stored in the DB2 databases in what is called an XML Schema
repository. To add an XML Schema to a repository, you use the REGISTER XMLSCHEMA
command.
For example, let's say you have an XML document stored in file order.xml as shown in
Figure 15.10