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public interface Joinable
Represents a value that can be joined to. Any column that a user joins to must be "owned" by an entity that implements this interface. The system maps columns to joinables to be able to decompose oids and field values into individual join values on a per-column basis. This allows us to support joins to only some of the columns of a mapping, and to be loose with the ordering of foreign key columns relative to the ordering of the joined-to columns. Having a separate interface for joinables also allows us to perform tricks such as a vertically-mapped application identity subclass transparently transforming columns of its foreign key to the corresponding primary key fields in the base class.
Method Summary | |
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Column[] |
getColumns()
The columns managed by this joinable. |
int |
getFieldIndex()
Return the field index of this joinable, or -1 if not a field. |
Object |
getJoinValue(Object val,
Column col,
JDBCStore store)
Return the join value of the given column. |
Object |
getJoinValue(OpenJPAStateManager sm,
Column col,
JDBCStore store)
Return the join value of the given column. |
Object |
getPrimaryKeyValue(Result res,
Column[] cols,
ForeignKey fk,
JDBCStore store,
Joins joins)
Return the value for this joinable from the given result, using the given columns. |
void |
setAutoAssignedValue(OpenJPAStateManager sm,
JDBCStore store,
Column col,
Object autogen)
Use the given auto-assigned value to set this join value's field on the given instance. |
Method Detail |
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int getFieldIndex()
Object getPrimaryKeyValue(Result res, Column[] cols, ForeignKey fk, JDBCStore store, Joins joins) throws SQLException
ForeignKey.getColumn(org.apache.openjpa.jdbc.schema.Column)
.
SQLException
Column[] getColumns()
Object getJoinValue(Object val, Column col, JDBCStore store)
val
- the value of the field for this joinablecol
- the column of this joinable whose value to returnObject getJoinValue(OpenJPAStateManager sm, Column col, JDBCStore store)
sm
- the instance from which to get the valuecol
- the column whose value to returnvoid setAutoAssignedValue(OpenJPAStateManager sm, JDBCStore store, Column col, Object autogen)
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