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## JDO extension for the Castor XML code generator Documentation Author(s): Werner Guttmann Introduction Prerequisite Sample XML schemas Prerequisite: Sample DDL statements The schema elements <column> element <one-to-one> element <one-to-many> element ## Introduction In this section we illustrate the use of the JDO extensions for the XML code generator. ## Prerequisite To facilitate the detailed explanations in the following sections, we now define a few <complexType> definitions that we want to map against an existing database schema, and the corresponding SQL statements to create the required tables. ### Sample XML schemas
    <complexType name="bookType">
       <sequence>
          <element name="isbn" type="xs:string" />
          <element name="pages" type="xs:integer" />
          <element name="lector" type="lectorType" />
          <element name="authors" type="authorType" maxOccurs="unbounded" />
       </sequence>
    </complexType>

    <complexType name="lectorType">
       <sequence>
          <element name="siNumber" type="xs:integer" />
          <element name="name" type="xs:string" />
       </sequence>
    </complexType>

    <complexType name="authorType">
       <sequence>
          <element name="siNumber" type="xs:integer" />
          <element name="name" type="xs:string" />
       </sequence>
    </complexType>
### Prerequisite: Sample DDL statements
    CREATE TABLE author_table (
    );

    CREATE TABLE lector_table (
    );

    CREATE TABLE book_table (
    );
## The schema elements The following XML artifacts are available to annotate an existing XML schema with JDO extension-specific information. ### <table> element The <table> element allows you to map an <complexType> definition to a table within a database, and to specify the identity (frequently referred to as primary key).
    <complexType name="authorType">
       <xs:annotation>
          <xs:appinfo>
             <jdo:table name="author_table">
                <jdo:primary-key>
                   <jdo:key>siNumber</jdo:key>
                </jdo:primary-key>
             </jdo:table>
          </xs:appinfo>
       </xs:annotation>
       <sequence>
          <element name="siNumber" type="xs:integer" />
          <element name="name" type="xs:string" />
       </sequence>
    </complexType>
This maps the <complexType> `authorType` to the table `author_table`, and specifies that the member `siNumber` be used as object identity (aka primary key). The <table> element is defined as follows:
    <xs:element name="table">
       <xs:complexType>
          <xs:sequence>
             <xs:element name="primaryKey" type="jdo:pkType"/>
          </xs:sequence>
          <xs:attribute name="name" type="xs:string" use="required"/>
          <xs:attribute name="accessMode" use="optional" default="shared">
             <xs:simpleType>
                <xs:restriction base="xs:string">
                   <xs:enumeration value="read-only"/>
                   <xs:enumeration value="shared"/>
                   <xs:enumeration value="exclusive"/>
                   <xs:enumeration value="db-locked"/>
                </xs:restriction>
             </xs:simpleType>
          </xs:attribute>
          <xs:attribute name="detachable" type="xs:boolean" default="false"/>
       </xs:complexType>
    </xs:element>
### <column> element The <column> element allows you to map a member of content model of a <complexType> definition to a column within a database.
    <complexType name="authorType">
       <xs:annotation>
          <xs:appinfo>
             <jdo:table name="author_table">
                <jdo:primary-key>
                   <jdo:key>siNumber</jdo:key>
                </jdo:primary-key>
             </jdo:table>
          </xs:appinfo>
       </xs:annotation>
       <sequence>
          <element name="siNumber" type="xs:integer" >
             <xs:annotation>
                <xs:appinfo>
                    <jdo:column name="sin" type="integer" />
                </xs:appinfo>
             </xs:annotation>
          </element>
          <element name="name" type="xs:string" />
       </sequence>
    </complexType>
This maps the <element> `isNUmber` to the column `sin`, and specifies the database type to be used for persistence. The <column> element is defined as follows:
    <xs:element name="column">
       <xs:complexType>
          <xs:complexContent>
             <xs:extension base="jdo:readonlyDirtyType">
                <xs:attribute name="name" type="xs:string" use="required" />
                <xs:attribute name="type" type="xs:string" use="required" />
                <xs:attribute name="acceptNull" type="xs:boolean" use="optional"
                   default="true" />
             </xs:extension>
          </xs:complexContent>
       </xs:complexType>
    </xs:element>
### <one-to-one> element The <one-to-one> element allows you to map a member of content model of a <complexType> definition to a 1:1 relation to another <complexType>.
    <complexType name="bookType">
       <xs:annotation>
          <xs:appinfo>
             <jdo:table name="book_type_table">
                <jdo:primary-key>
                   <jdo:key>isbn</jdo:key>
                </jdo:primary-key>
             </jdo:table>
          </xs:appinfo>
       </xs:annotation>
       <sequence>
          <element name="isbn" type="xs:string" >
             <xs:annotation>
                <xs:appinfo>
                    <jdo:column name="isbn" type="varchar" />
                </xs:appinfo>
             </xs:annotation>
          </element>
          <element name="pages" type="xs:integer" >
             <xs:annotation>
                <xs:appinfo>
                    <jdo:column name="pages" type="integer" />
                </xs:appinfo>
             </xs:annotation>
          </element>
          <element name="lector" type="lectorType" >
             <xs:annotation>
                <xs:appinfo>
                   <jdo:one-to-one name="lector_id" />
                </xs:appinfo>
             </xs:annotation>
          </element>
          <element name="authors" type="authorType" maxOccurs="unbounded" >
             ...
          </element>
       </sequence>
    </complexType>
This maps the <element> `lector` to 1:1 relation to the `lectorType` <complexType>, and specifies the (column name of the) foreign key to be used. The <one-to-one> element is defined as follows:
    <xs:element name="one-to-one">
       <xs:complexType>
          <xs:complexContent>
             <xs:extension base="jdo:readonlyDirtyType">
                <xs:attribute name="name" type="xs:string"/>
             </xs:extension>
          </xs:complexContent>
       </xs:complexType>
    </xs:element>
where the content is described as follows:
<one-to-one> - Definitions
Name | Description
name | Specifies the name of the column that represents the foreign key of this relation.
### <one-to-many> element TBD
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