Customizing assignment of a field to a column

Question

Hi,
I'd like to customize mappings between a field property and a column of
a table in the datastore; I'd like to use the
PropertiesReverseCustomizer in order to
modifiy the default mapping.
For exampe, suppose these two tables exist in the schema:
FOO(FOO_ID PRIMARY KEY, FIRST_BAR_ID FOREIGN KEY REFERENCES BAR.BAR_ID,
SECOND_BAR_ID FOREIGN KEY REFERENCES BAR.BAR_ID)
BAR(BAR_ID PRIMARY KEY)
By default, the reverse mapping tool generates these two classes:
class Foo {
     Long fooId;
     Bar bar;
     Bar bar1;
<mapping>
<package name="test">
<class name="Foo">
<jdbc-class-map type="base" table="FOO"/>
<jdbc-class-ind type="subclass-join"/>
<field name="fooId">
<jdbc-field-map type="value" column="FOO_ID"/>
</field>
<field name="bar">
<jdbc-field-map type="one-one"
column.BAR_ID="SECOND_BAR_ID"/>
</field>
<field name="bar1">
<jdbc-field-map type="one-one"
column.BAR_ID="FIRST_BAR_ID"/>
</field>
</class>
</package>
</mapping>
class Bar {
     Long barId;
     List bars;
     List bar1s;
<mapping>
<package name="test">
<class name="Bar">
<jdbc-class-map type="base" table="BAR"/>
<jdbc-class-ind type="subclass-join"/>
<field name="barId">
<jdbc-field-map type="value" column="BAR_ID"/>
</field>
<field name="bars">
<jdbc-field-map type="one-many"
ref-column.BAR_ID="FIRST_BAR_ID" table="FOO"/>
</field>
<field name="bars">
<jdbc-field-map type="one-many"
ref-column.BAR_ID="SECOND_BAR_ID" table="FOO"/>
</field>
</class>
</package>
</mapping>
I rename the properties of the Foo class, in this way:
test.Foo.bar.rename=firstBar
test.Foo.bar1.rename=secondBar
The problem is that the customizer still maps the "firtBar" to the
column "BAR.SECOND_BAR_ID" and "secondBar" is mapped to "BAR.FIRST_BAR_ID".
So, I implemented PropertiesReverseCustomizer.customize(FieldMapping
fieldMapping):
public boolean customize(FieldMapping fieldMapping) {
     super.customize(fieldMapping);
     if(fieldMapping.getFullName().equals("test.Foo.firstBar")){
          OneToOneFieldMapping oneToOneFieldMapping =
(OneToOneFieldMapping)fieldMapping;
          ForeignKey foreignKey =
oneToOneFieldMapping.getTable().getForeignKey(FIRST_BAR_RELATION);
          oneToOneFieldMapping.setForeignKey(foreignKey);
     if(fieldMapping.getFullName().equals("test.Foo.secondBar")){
          OneToOneFieldMapping oneToOneFieldMapping =
(OneToOneFieldMapping)fieldMapping;
          ForeignKey foreignKey =
oneToOneFieldMapping.getTable().getForeignKey(SECOND_BAR_RELATION);
          oneToOneFieldMapping.setForeignKey(foreignKey);
     return true;
But the result is very strange. In fact, these are the generated classes:
class Foo {
     Long fooId;
     Long secondBarId;
     Bar bar;
class Bar {
     Long barId;
     List bars;
I really can't undestand why, but I supposed that switching the
ForeignKey object is not the right solution, so I tried this way:
public boolean customize(FieldMapping fieldMapping) {
     super.customize(fieldMapping);
     ForeignKey foreignKey = null;
     if(fieldMapping.getFullName().equals("test.Foo.firstBar")){
          OneToOneFieldMapping oneToOneFieldMapping =
(OneToOneFieldMapping)fieldMapping;
          ForeignKey foreignKey =
oneToOneFieldMapping.getTable().getForeignKey(FIRST_BAR_RELATION);
     if(fieldMapping.getFullName().equals("test.Foo.secondBar")){
          OneToOneFieldMapping oneToOneFieldMapping =
(OneToOneFieldMapping)fieldMapping;
          foreignKey =
oneToOneFieldMapping.getTable().getForeignKey(SECOND_BAR_RELATION);
     if(foreingKey!=null){
          ClassMapping classMapping =
tool.getClassMapping(fieldMapping.getTable());
          ClassMappingInfo classMappingInfo = classMapping.getMappingInfo();
          MappingInfo mappingInfo =
classMappingInfo.getField(fieldMapping.getName());
          FieldMetaData fieldMetaData = fieldMapping.getMetaData();
          Mappings.setForeignKey(mappingInfo,null,foreignKey);
     return true;
But the variable classMappingInfo is NULL!!!
I think that my goal is not so difficult, I just want to assign a given
field to a table column which is decided by me, but I can't understand
how I can do it.c

Answer 1

Claudio-
> I rename the properties of the Foo class, in this way:
>
> test.Foo.bar.rename=firstBar
> test.Foo.bar1.rename=secondBar
>
> The problem is that the customizer still maps the "firtBar" to the
> column "BAR.SECOND_BAR_ID" and "secondBar" is mapped to
"BAR.FIRST_BAR_ID".
What happens if you switch them? I.e.:
test.Foo.bar.rename=secondBar
test.Foo.bar1.rename=firstBar
Claudio Tasso wrote:
Hi,
I'd like to customize mappings between a field property and a column of
a table in the datastore; I'd like to use the
PropertiesReverseCustomizer in order to
modifiy the default mapping.
For exampe, suppose these two tables exist in the schema:
FOO(FOO_ID PRIMARY KEY, FIRST_BAR_ID FOREIGN KEY REFERENCES BAR.BAR_ID,
SECOND_BAR_ID FOREIGN KEY REFERENCES BAR.BAR_ID)
BAR(BAR_ID PRIMARY KEY)
By default, the reverse mapping tool generates these two classes:
class Foo {
Long fooId;
Bar bar;
Bar bar1;
<mapping>
<package name="test">
<class name="Foo">
<jdbc-class-map type="base" table="FOO"/>
<jdbc-class-ind type="subclass-join"/>
<field name="fooId">
<jdbc-field-map type="value" column="FOO_ID"/>
</field>
<field name="bar">
<jdbc-field-map type="one-one"
column.BAR_ID="SECOND_BAR_ID"/>
</field>
<field name="bar1">
<jdbc-field-map type="one-one"
column.BAR_ID="FIRST_BAR_ID"/>
</field>
</class>
</package>
</mapping>
class Bar {
Long barId;
List bars;
List bar1s;
<mapping>
<package name="test">
<class name="Bar">
<jdbc-class-map type="base" table="BAR"/>
<jdbc-class-ind type="subclass-join"/>
<field name="barId">
<jdbc-field-map type="value" column="BAR_ID"/>
</field>
<field name="bars">
<jdbc-field-map type="one-many"
ref-column.BAR_ID="FIRST_BAR_ID" table="FOO"/>
</field>
<field name="bars">
<jdbc-field-map type="one-many"
ref-column.BAR_ID="SECOND_BAR_ID" table="FOO"/>
</field>
</class>
</package>
</mapping>
I rename the properties of the Foo class, in this way:
test.Foo.bar.rename=firstBar
test.Foo.bar1.rename=secondBar
The problem is that the customizer still maps the "firtBar" to the
column "BAR.SECOND_BAR_ID" and "secondBar" is mapped to "BAR.FIRST_BAR_ID".
So, I implemented PropertiesReverseCustomizer.customize(FieldMapping
fieldMapping):
public boolean customize(FieldMapping fieldMapping) {
super.customize(fieldMapping);
if(fieldMapping.getFullName().equals("test.Foo.firstBar")){
OneToOneFieldMapping oneToOneFieldMapping =
(OneToOneFieldMapping)fieldMapping;
ForeignKey foreignKey =
oneToOneFieldMapping.getTable().getForeignKey(FIRST_BAR_RELATION);
oneToOneFieldMapping.setForeignKey(foreignKey);
if(fieldMapping.getFullName().equals("test.Foo.secondBar")){
OneToOneFieldMapping oneToOneFieldMapping =
(OneToOneFieldMapping)fieldMapping;
ForeignKey foreignKey =
oneToOneFieldMapping.getTable().getForeignKey(SECOND_BAR_RELATION);
oneToOneFieldMapping.setForeignKey(foreignKey);
return true;
But the result is very strange. In fact, these are the generated classes:
class Foo {
Long fooId;
Long secondBarId;
Bar bar;
class Bar {
Long barId;
List bars;
I really can't undestand why, but I supposed that switching the
ForeignKey object is not the right solution, so I tried this way:
public boolean customize(FieldMapping fieldMapping) {
super.customize(fieldMapping);
ForeignKey foreignKey = null;
if(fieldMapping.getFullName().equals("test.Foo.firstBar")){
OneToOneFieldMapping oneToOneFieldMapping =
(OneToOneFieldMapping)fieldMapping;
ForeignKey foreignKey =
oneToOneFieldMapping.getTable().getForeignKey(FIRST_BAR_RELATION);
if(fieldMapping.getFullName().equals("test.Foo.secondBar")){
OneToOneFieldMapping oneToOneFieldMapping =
(OneToOneFieldMapping)fieldMapping;
foreignKey =
oneToOneFieldMapping.getTable().getForeignKey(SECOND_BAR_RELATION);
if(foreingKey!=null){
ClassMapping classMapping =
tool.getClassMapping(fieldMapping.getTable());
ClassMappingInfo classMappingInfo = classMapping.getMappingInfo();
MappingInfo mappingInfo =
classMappingInfo.getField(fieldMapping.getName());
FieldMetaData fieldMetaData = fieldMapping.getMetaData();
Mappings.setForeignKey(mappingInfo,null,foreignKey);
return true;
But the variable classMappingInfo is NULL!!!
I think that my goal is not so difficult, I just want to assign a given
field to a table column which is decided by me, but I can't understand
how I can do it.c--
Marc Prud'hommeaux
SolarMetric Inc.