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 _resolveForeignKeys(self):
'''Links foreign keys to other tables. MUST be called AFTER all
tables have been instantiated as TableInfo objects'''
fkeycols = []
self.fKeys = list()
for fk in self._fKeysSA:
self.fKeys.append(ForeignKeyInfo(fk, self))
fkeycols.extend(fk['constrained_columns'])
#Find all columns of the table that belong to some foreign key
fkeycolsUniq = listUnique(fkeycols) if self._fKeysSA else list()
self.fKeysCols = OrderedDict()
for name in fkeycolsUniq:
self.fKeysCols[name] = self.cols[name]
self.cols[name].isFkCol = True
#All tables this table refers to
self.refTables = listUnique([k.refTable for k in self.fKeys])
#Processes below can not be called earlier than that
if self.isManyToMany():
relType = "%s_%s" % (self.fKeys[0].refTable.labelName,
self.fKeys[1].refTable.labelName)
#relType attribute is set ONLY for such tables
self.relType = _transformRelTypes(relType)
if REMOVE_REDUNDANT_FIELDS:
self.importCols = {k: v for k, v in self.cols.items() \
if not v.isRedundant()}
else:
self.importCols = self.cols
def _resolveForeignKeys(self):
"""Links foreign keys to other tables. MUST be called AFTER all
tables have been instantiated as TableInfo objects"""
fkeycols = []
self.fKeys = list()
for fk in self._fKeysSA:
self.fKeys.append(ForeignKeyInfo(fk, self))
fkeycols.extend(fk["constrained_columns"])
# Find all columns of the table that belong to some foreign key
fkeycolsUniq = listUnique(fkeycols) if self._fKeysSA else list()
self.fKeysCols = OrderedDict()
for name in fkeycolsUniq:
self.fKeysCols[name] = self.cols[name]
self.cols[name].isFkCol = True
# All tables this table refers to
self.refTables = listUnique([k.refTable for k in self.fKeys])
# Processes below can not be called earlier than that
if self.isManyToMany():
relType = "%s_%s" % (self.fKeys[0].refTable.labelName, self.fKeys[1].refTable.labelName)
# relType attribute is set ONLY for such tables
self.relType = _transformRelTypes(relType)
if REMOVE_REDUNDANT_FIELDS:
self.importCols = {k: v for k, v in self.cols.items() if not v.isRedundant()}
else:
self.importCols = self.cols
