String constraintStateStr;
boolean constraintEnabled;
int referenceCount;
String constraintUUIDString;
String schemaUUIDString;
SubConstraintDescriptor scd;
if (SanityManager.DEBUG)
{
if (!(parentTupleDescriptor instanceof SubConstraintDescriptor))
{
SanityManager.THROWASSERT(
"parentTupleDescriptor expected to be instanceof " +
"SubConstraintDescriptor, not " +
parentTupleDescriptor.getClass().getName());
}
}
scd = (SubConstraintDescriptor) parentTupleDescriptor;
ddg = dd.getDataDescriptorGenerator();
/* 1st column is CONSTRAINTID (UUID - char(36)) */
col = row.getColumn(SYSCONSTRAINTS_CONSTRAINTID);
constraintUUIDString = col.getString();
constraintUUID = getUUIDFactory().recreateUUID(constraintUUIDString);
/* 2nd column is TABLEID (UUID - char(36)) */
col = row.getColumn(SYSCONSTRAINTS_TABLEID);
tableUUIDString = col.getString();
tableUUID = getUUIDFactory().recreateUUID(tableUUIDString);
/* Get the TableDescriptor.
* It may be cached in the SCD,
* otherwise we need to go to the
* DD.
*/
if (scd != null)
{
td = scd.getTableDescriptor();
}
if (td == null)
{
td = dd.getTableDescriptor(tableUUID);
}
/* 3rd column is NAME (varchar(128)) */
col = row.getColumn(SYSCONSTRAINTS_CONSTRAINTNAME);
constraintName = col.getString();
/* 4th column is TYPE (char(1)) */
col = row.getColumn(SYSCONSTRAINTS_TYPE);
constraintSType = col.getString();
if (SanityManager.DEBUG)
{
SanityManager.ASSERT(constraintSType.length() == 1,
"Fourth column type incorrect");
}
boolean typeSet = false;
switch (constraintSType.charAt(0))
{
case 'P' :
constraintIType = DataDictionary.PRIMARYKEY_CONSTRAINT;
typeSet = true;
// fall through
case 'U' :
if (! typeSet)
{
constraintIType = DataDictionary.UNIQUE_CONSTRAINT;
typeSet = true;
}
// fall through
case 'F' :
if (! typeSet)
constraintIType = DataDictionary.FOREIGNKEY_CONSTRAINT;
if (SanityManager.DEBUG)
{
if (!(parentTupleDescriptor instanceof SubKeyConstraintDescriptor))
{
SanityManager.THROWASSERT(
"parentTupleDescriptor expected to be instanceof " +
"SubKeyConstraintDescriptor, not " +
parentTupleDescriptor.getClass().getName());
}
}
conglomDesc = td.getConglomerateDescriptor(
((SubKeyConstraintDescriptor)
parentTupleDescriptor).getIndexId());
/* Take care the rare case of conglomDesc being null. The
* reason is that our "td" is out of date. Another thread
* which was adding a constraint committed between the moment
* we got the table descriptor (conglomerate list) and the
* moment we scanned and got the constraint desc list. Since
* that thread just added a new row to SYSCONGLOMERATES,
* SYSCONSTRAINTS, etc. We wouldn't have wanted to lock the
* system tables just to prevent other threads from adding new
* rows.
*/
if (conglomDesc == null)
{
// we can't be getting td from cache because if we are
// here, we must have been in dd's ddl mode (that's why
// the ddl thread went through), we are not done yet, the
// dd ref count is not 0, hence it couldn't have turned
// into COMPILE_ONLY mode
td = dd.getTableDescriptor(tableUUID);
if (scd != null)
scd.setTableDescriptor(td);
// try again now
conglomDesc = td.getConglomerateDescriptor(
((SubKeyConstraintDescriptor)
parentTupleDescriptor).getIndexId());
}