def _setIndexedCols(self):
'''Decides which fields must be indexed, based on key and index
information.'''
#Find all columns that are indexed or unique indexed
uniq = self.sqlDb.inspector.get_unique_constraints(self.tableName)
idx = self.sqlDb.inspector.get_indexes(self.tableName)
#Only single-field constraints will be carried over as such
uniqCols = [x['column_names'] for x in uniq \
if len(x['column_names']) == 1]
idxCols = [x['column_names'] for x in idx]
idxCols.extend([x['column_names'] for x in uniq \
if len(x['column_names']) != 1])
#Don't forget primary key constraint
if len(self.pkCols) == 1:
uniqCols.append(self.pkCols.keys())
else:
idxCols.append(self.pkCols.keys())
uniqColNames = listUnique(listFlatten(uniqCols))
#Remove unique constrained columns from columns to be indexed
idxColNames = listSubtract(listUnique(listFlatten(idxCols)),
uniqColNames)
self.uniqCols = [self.cols[x] for x in uniqColNames]
#Redundant fields are excluded
if REMOVE_REDUNDANT_FIELDS:
self.idxCols = [self.cols[x] for x in idxColNames \
if not self.cols[x].isRedundant()]
else:
self.idxCols = [self.cols[x] for x in idxColNames]
LOG.debug("Unique constraints on table %s, columns %s" %
(self.tableName, str([x.name for x in self.uniqCols])))
LOG.debug("Indexes on table %s, columns %s" %
(self.tableName, str([x.name for x in self.idxCols])))
def _setIndexedCols(self):
"""Decides which fields must be indexed, based on key and index
information."""
# Find all columns that are indexed or unique indexed
uniq = self.sqlDb.inspector.get_unique_constraints(self.tableName)
idx = self.sqlDb.inspector.get_indexes(self.tableName)
# Only single-field constraints will be carried over as such
uniqCols = [x["column_names"] for x in uniq if len(x["column_names"]) == 1]
idxCols = [x["column_names"] for x in idx]
idxCols.extend([x["column_names"] for x in uniq if len(x["column_names"]) != 1])
# Don't forget primary key constraint
if len(self.pkCols) == 1:
uniqCols.append(self.pkCols.keys())
else:
idxCols.append(self.pkCols.keys())
uniqColNames = listUnique(listFlatten(uniqCols))
# Remove unique constrained columns from columns to be indexed
idxColNames = listSubtract(listUnique(listFlatten(idxCols)), uniqColNames)
self.uniqCols = [self.cols[x] for x in uniqColNames]
# Redundant fields are excluded
if REMOVE_REDUNDANT_FIELDS:
self.idxCols = [self.cols[x] for x in idxColNames if not self.cols[x].isRedundant()]
else:
self.idxCols = [self.cols[x] for x in idxColNames]
LOG.debug("Unique constraints on table %s, columns %s" % (self.tableName, str([x.name for x in self.uniqCols])))
LOG.debug("Indexes on table %s, columns %s" % (self.tableName, str([x.name for x in self.idxCols])))
def _ensureUniqRelTypes(self):
"""There may be synonym relation types refering to different foreign
keys or even different many-to-many tables. Here we will ensure that
this will not happen. IMPORTANT:This should be called only after all
foreign keys have been instantiated."""
# Get all objects that will be imported as relationships
m2mTables = [tbl for tbl in self.tables.values() if tbl.isManyToMany()]
allFKeys = [tbl.fKeys for tbl in self.tables.values() if not tbl.isManyToMany()]
allRelObjects = listFlatten(allFKeys)
allRelObjects.extend(m2mTables)
for i, (obj1, obj2) in enumerate(combinations(allRelObjects, 2)):
assert hasattr(obj1, "relType") and hasattr(obj2, "relType")
if obj1.relType == obj2.relType:
# Silly, but it works
obj1.relType = obj1.relType + str(i * 2)
obj2.relType = obj2.relType + str(i * 2 + 1)
def _ensureUniqRelTypes(self):
'''There may be synonym relation types refering to different foreign
keys or even different many-to-many tables. Here we will ensure that
this will not happen. IMPORTANT:This should be called only after all
foreign keys have been instantiated.'''
#Get all objects that will be imported as relationships
m2mTables = [tbl for tbl in self.tables.values() \
if tbl.isManyToMany()]
allFKeys = [tbl.fKeys for tbl in self.tables.values() \
if not tbl.isManyToMany()]
allRelObjects = listFlatten(allFKeys)
allRelObjects.extend(m2mTables)
for i, (obj1, obj2) in enumerate(combinations(allRelObjects, 2)):
assert hasattr(obj1, 'relType') and \
hasattr(obj2, 'relType')
if obj1.relType == obj2.relType:
#Silly, but it works
obj1.relType = obj1.relType + str(i * 2)
obj2.relType = obj2.relType + str(i * 2 + 1)
