/**
* Creates foreign keys for subclass tables that are mapped using table per subclass. Further
* information is available in the <a href="http://jira.grails.org/browse/GRAILS-7729">JIRA
* ticket</a>
*/
private void createSubclassForeignKeys() {
if (subclassForeignKeysCreated) {
return;
}
for (PersistentClass persistentClass : classes.values()) {
if (persistentClass instanceof RootClass) {
RootClass rootClass = (RootClass) persistentClass;
if (rootClass.hasSubclasses()) {
Iterator subclasses = rootClass.getSubclassIterator();
while (subclasses.hasNext()) {
Object subclass = subclasses.next();
// This test ensures that foreign keys will only be created for subclasses that are
// mapped using "table per subclass"
if (subclass instanceof JoinedSubclass) {
JoinedSubclass joinedSubclass = (JoinedSubclass) subclass;
joinedSubclass.createForeignKey();
}
}
}
}
}
subclassForeignKeysCreated = true;
}
public String[] getCleanSql() {
if (cleanSql == null) {
// loop over all foreign key constraints
List dropForeignKeysSql = new ArrayList();
List createForeignKeysSql = new ArrayList();
Iterator iter = configuration.getTableMappings();
while (iter.hasNext()) {
Table table = (Table) iter.next();
if (table.isPhysicalTable()) {
Iterator subIter = table.getForeignKeyIterator();
while (subIter.hasNext()) {
ForeignKey fk = (ForeignKey) subIter.next();
if (fk.isPhysicalConstraint()) {
// collect the drop key constraint
dropForeignKeysSql.add(
fk.sqlDropString(
dialect,
properties.getProperty(Environment.DEFAULT_CATALOG),
properties.getProperty(Environment.DEFAULT_SCHEMA)));
createForeignKeysSql.add(
fk.sqlCreateString(
dialect,
mapping,
properties.getProperty(Environment.DEFAULT_CATALOG),
properties.getProperty(Environment.DEFAULT_SCHEMA)));
}
}
}
}
List deleteSql = new ArrayList();
iter = configuration.getTableMappings();
while (iter.hasNext()) {
Table table = (Table) iter.next();
deleteSql.add("delete from " + table.getName());
}
List cleanSqlList = new ArrayList();
cleanSqlList.addAll(dropForeignKeysSql);
cleanSqlList.addAll(deleteSql);
cleanSqlList.addAll(createForeignKeysSql);
cleanSql = (String[]) cleanSqlList.toArray(new String[cleanSqlList.size()]);
}
return cleanSql;
}