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Merged
dcbrandao merged 1 commit into from
Mar 8, 2019
Merged

Refactor updates and add index-related updates #40

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164 changes: 77 additions & 87 deletions spanner_orm/admin/metadata.py
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Original file line number Diff line number Diff line change
Expand Up @@ -28,41 +28,36 @@

class SpannerMetadata(object):
"""Gathers information about a table from Spanner."""
_models = None
_tables = None
_indexes = None

@classmethod
def models(cls):
"""Constructs model classes from Spanner table schema."""
if cls._models is None:
tables = cls.tables()
indexes = cls.indexes()
models = {}

for table_name, table_data in tables.items():
primary_index = indexes[table_name][index.Index.PRIMARY_INDEX]
primary_keys = set(primary_index.columns)
klass = model.ModelBase('Model_{}'.format(table_name), (model.Model,),
{})
for field in table_data['fields'].values():
field._primary_key = field.name in primary_keys # pylint: disable=protected-access

klass.meta = model.Metadata(
table=table_name,
fields=table_data['fields'],
interleaved=table_data['parent_table'],
indexes=indexes[table_name],
model_class=klass)
models[table_name] = klass

for table_model in models.values():
if table_model.meta.interleaved:
table_model.meta.interleaved = models[table_model.meta.interleaved]
table_model.meta.finalize()

cls._models = models
return cls._models
tables = cls.tables()
indexes = cls.indexes()
models = {}

for table_name, table_data in tables.items():
primary_index = indexes[table_name][index.Index.PRIMARY_INDEX]
primary_keys = set(primary_index.columns)
klass = model.ModelBase('Model_{}'.format(table_name), (model.Model,),
{})
for field in table_data['fields'].values():
field._primary_key = field.name in primary_keys # pylint: disable=protected-access

klass.meta = model.Metadata(
table=table_name,
fields=table_data['fields'],
interleaved=table_data['parent_table'],
indexes=indexes[table_name],
model_class=klass)
models[table_name] = klass

for table_model in models.values():
if table_model.meta.interleaved:
table_model.meta.interleaved = models[table_model.meta.interleaved]
table_model.meta.finalize()

return models

@classmethod
def model(cls, table_name):
Expand All @@ -71,63 +66,58 @@ def model(cls, table_name):
@classmethod
def tables(cls):
"""Compiles table information from column schema."""
if cls._tables is None:
column_data = collections.defaultdict(dict)
columns = column.ColumnSchema.where(
None, condition.equal_to('table_catalog', ''),
condition.equal_to('table_schema', ''))
for column_row in columns:
new_field = field.Field(
column_row.field_type(), nullable=column_row.nullable())
new_field.name = column_row.column_name
new_field.position = column_row.ordinal_position
column_data[column_row.table_name][column_row.column_name] = new_field

table_data = collections.defaultdict(dict)
tables = table.TableSchema.where(
None, condition.equal_to('table_catalog', ''),
condition.equal_to('table_schema', ''))
for table_row in tables:
name = table_row.table_name
table_data[name]['parent_table'] = table_row.parent_table_name
table_data[name]['fields'] = column_data[name]
cls._tables = table_data
return cls._tables
column_data = collections.defaultdict(dict)
columns = column.ColumnSchema.where(
None, condition.equal_to('table_catalog', ''),
condition.equal_to('table_schema', ''))
for column_row in columns:
new_field = field.Field(
column_row.field_type(), nullable=column_row.nullable())
new_field.name = column_row.column_name
new_field.position = column_row.ordinal_position
column_data[column_row.table_name][column_row.column_name] = new_field

table_data = collections.defaultdict(dict)
tables = table.TableSchema.where(
None, condition.equal_to('table_catalog', ''),
condition.equal_to('table_schema', ''))
for table_row in tables:
name = table_row.table_name
table_data[name]['parent_table'] = table_row.parent_table_name
table_data[name]['fields'] = column_data[name]
return table_data

@classmethod
def indexes(cls):
"""Compiles index information from index and index columns schemas."""
if cls._indexes is None:
# ordinal_position is the position of the column in the indicated index.
# Results are ordered by that so the index columns are added in the
# correct order.
index_column_schemas = index_column.IndexColumnSchema.where(
None, condition.equal_to('table_catalog', ''),
condition.equal_to('table_schema', ''),
condition.order_by(('ordinal_position', condition.OrderType.ASC)))

index_columns = collections.defaultdict(list)
storing_columns = collections.defaultdict(list)
for schema in index_column_schemas:
key = (schema.table_name, schema.index_name)
if schema.ordinal_position is not None:
index_columns[key].append(schema.column_name)
else:
storing_columns[key].append(schema.column_name)

index_schemas = index_schema.IndexSchema.where(
None, condition.equal_to('table_catalog', ''),
condition.equal_to('table_schema', ''))
indexes = collections.defaultdict(dict)
for schema in index_schemas:
key = (schema.table_name, schema.index_name)
indexes[schema.table_name][schema.index_name] = index.Index(
index_columns[key],
schema.index_name,
parent=schema.parent_table_name,
null_filtered=schema.is_null_filtered,
unique=schema.is_unique,
storing_columns=storing_columns[key])
cls._indexes = indexes

return cls._indexes
# ordinal_position is the position of the column in the indicated index.
# Results are ordered by that so the index columns are added in the
# correct order.
index_column_schemas = index_column.IndexColumnSchema.where(
None, condition.equal_to('table_catalog', ''),
condition.equal_to('table_schema', ''),
condition.order_by(('ordinal_position', condition.OrderType.ASC)))

index_columns = collections.defaultdict(list)
storing_columns = collections.defaultdict(list)
for schema in index_column_schemas:
key = (schema.table_name, schema.index_name)
if schema.ordinal_position is not None:
index_columns[key].append(schema.column_name)
else:
storing_columns[key].append(schema.column_name)

index_schemas = index_schema.IndexSchema.where(
None, condition.equal_to('table_catalog', ''),
condition.equal_to('table_schema', ''))
indexes = collections.defaultdict(dict)
for schema in index_schemas:
key = (schema.table_name, schema.index_name)
indexes[schema.table_name][schema.index_name] = index.Index(
index_columns[key],
schema.index_name,
parent=schema.parent_table_name,
null_filtered=schema.is_null_filtered,
unique=schema.is_unique,
storing_columns=storing_columns[key])
return indexes
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