Hi,
Just one comment. When mapping using PC key, serialized-key doesn't
make sense. (In fact, I wonder why it's in the spec. except for
completeness).
Craig
On Oct 14, 2005, at 2:20 PM, Apache Wiki wrote:
Dear Wiki user,
You have subscribed to a wiki page or wiki category on "Jdo Wiki"
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The following page has been changed by MichelleCaisse:
http://wiki.apache.org/jdo/MappingCollections
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== Maps of Persistence Capable (PC) Types ==
- These are maps where either the key or value is a PC type. We
test the following cases:
+ These are maps where either the key or value is a PC type. We
test the following cases, assuming a String key and PC value:
* Collection field is serialized in the main table ('''s''')
- * Both key and value are embedded in a join table, the PC member
of the mapped pair is mapped to a foreign key to a secondary table
('''efk''')
+ * String key is embedded in a join table; the PC value is mapped
to a foreign key column in the join table. The fk references the
primary key of the table containing the PC. ('''efk''') (default)
- * PC key or value is serialized in a join table, the non-PC
member of the mapped pair is stored in another column of the join
table ('''es''')
+ * PC value is serialized in a join table, the String key of the
mapped pair is stored in another column of the join table. ('''es''')
+ * PC value and String key are embedded in a join table. ('''ee''')
== Maps of Java Types ==
- These are maps where both key and value are Java types. We test
the following cases:
+ These are maps where the key is a String and the value is a Java
type, for example Date, Locale, Integer. We test the following cases:
* Collection field is serialized in the main table ('''s''')
- * Both key and value are embedded in a join table ('''efk''')
+ * Both key and value are embedded in a join table ('''ee''')
== Metadata for Maps ==
The metadata for these cases, assuming the key is a String and
the value is a PC type, is:
||case||jdo metadata||orm metadata||
||s|| <field serialized="true">|| <field name="''name''">||
- ||efk|| <map embedded-key="true" embedded-value="true">|| <field
name="''name''" table="''join_table''">||
+ ||efk|| <map embedded-key="true" embedded-value="false">|| <field
name="''name''" table="''join_table''">||
||es|| <map embedded-key="true" serialized-value="true">|| <field
name="''name''" table="''join_table''">||
+ ||ee|| <map embedded-key="true" embedded-value="true">|| <field
name="''name''" table="''join_table''">||
