customizing hibernate properties in hyperjaxb

问题

The default configuration of hyperjaxb is creating hibernate annotations that result in hibernate annotations that produce incredibly verbose SQL statements that result in SQLExceptions at worst and slow performance at best. Specifically, the CascadeType.ALL setting seems to be the default. How do I override the default settings so that CascadeType, FetchType, and other parameters are set on a customized basis? And is it possible to set these default variables on a global level so that I do not have to change every one of many hundreds of references in my schema.xsd file?

Here is an example. Hyperjaxb is generating the following hibernate annotation:

@ManyToOne(targetEntity = Code.class, cascade = {
    CascadeType.ALL
})
@JoinColumn(name = "SOME_CODE1_P_0")
public Code getSomeCode1() {
    return someCode1;
}

from the following schema fragment:

<xs:complexType name="SomeTypeName">
    <xs:sequence>
        <xs:element name="title" type="xs:string" minOccurs="0" maxOccurs="unbounded"/>
        <xs:element name="someCode1" type="Code" minOccurs="0"/>
        <xs:element name="someCode2" type="Code" minOccurs="0"/>
        <xs:element name="someCode3" type="Code" minOccurs="0"/>
        <xs:element name="someCode4" type="Code" minOccurs="0"/>
        <xs:element name="someCode5" type="Code" minOccurs="0"/>
    </xs:sequence>
</xs:complexType>

<xs:complexType name="Code">
    <!--<xs:sequence>elements with nested data types omitted for simplicity</xs:sequence>-->
    <xs:attribute name="code" type="xs:string" use="optional"></xs:attribute>
    <xs:attribute name="Name" type="xs:string" use="optional"></xs:attribute>
</xs:complexType>

回答1:

You can customize default mappings as you want:

http://confluence.highsource.org/display/HJ3/Customizing+default+mappings

Here are the default customizations.

And here's a test project which customizes defaults.

For instance, customizing the default cascade for many-to-one would look like (untested):

<jaxb:bindings schemaLocation="schema.xsd" node="/xs:schema">
    <hj:persistence>
        <hj:default-many-to-one>
            <!-- So what do you think to be a reasonable default mapping? -->
            <orm:cascade>
                <orm:cascade-persist/>
            </orm:cascade>
        </hj:default-many-to-one>
    </hj:persistence>
</jaxb:bindings>

Further links:

Customizations schema
Customizations guide

Please check the documentation. You can (but don't have to) customize a lot.

来源：https://stackoverflow.com/questions/26597201/customizing-hibernate-properties-in-hyperjaxb

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java

hibernate

jaxb

hyperjaxb