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https://github.com/janeczku/calibre-web
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194 lines
6.9 KiB
Python
194 lines
6.9 KiB
Python
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# engine/ddl.py
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# Copyright (C) 2009-2013 the SQLAlchemy authors and contributors <see AUTHORS file>
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#
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# This module is part of SQLAlchemy and is released under
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# the MIT License: http://www.opensource.org/licenses/mit-license.php
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"""Routines to handle CREATE/DROP workflow."""
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from .. import schema
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from ..sql import util as sql_util
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class DDLBase(schema.SchemaVisitor):
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def __init__(self, connection):
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self.connection = connection
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class SchemaGenerator(DDLBase):
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def __init__(self, dialect, connection, checkfirst=False,
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tables=None, **kwargs):
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super(SchemaGenerator, self).__init__(connection, **kwargs)
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self.checkfirst = checkfirst
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self.tables = tables
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self.preparer = dialect.identifier_preparer
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self.dialect = dialect
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self.memo = {}
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def _can_create_table(self, table):
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self.dialect.validate_identifier(table.name)
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if table.schema:
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self.dialect.validate_identifier(table.schema)
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return not self.checkfirst or \
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not self.dialect.has_table(self.connection,
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table.name, schema=table.schema)
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def _can_create_sequence(self, sequence):
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return self.dialect.supports_sequences and \
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(
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(not self.dialect.sequences_optional or
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not sequence.optional) and
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(
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not self.checkfirst or
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not self.dialect.has_sequence(
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self.connection,
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sequence.name,
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schema=sequence.schema)
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)
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)
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def visit_metadata(self, metadata):
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if self.tables is not None:
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tables = self.tables
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else:
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tables = metadata.tables.values()
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collection = [t for t in sql_util.sort_tables(tables)
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if self._can_create_table(t)]
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seq_coll = [s for s in metadata._sequences.values()
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if s.column is None and self._can_create_sequence(s)]
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metadata.dispatch.before_create(metadata, self.connection,
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tables=collection,
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checkfirst=self.checkfirst,
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_ddl_runner=self)
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for seq in seq_coll:
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self.traverse_single(seq, create_ok=True)
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for table in collection:
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self.traverse_single(table, create_ok=True)
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metadata.dispatch.after_create(metadata, self.connection,
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tables=collection,
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checkfirst=self.checkfirst,
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_ddl_runner=self)
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def visit_table(self, table, create_ok=False):
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if not create_ok and not self._can_create_table(table):
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return
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table.dispatch.before_create(table, self.connection,
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checkfirst=self.checkfirst,
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_ddl_runner=self)
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for column in table.columns:
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if column.default is not None:
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self.traverse_single(column.default)
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self.connection.execute(schema.CreateTable(table))
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if hasattr(table, 'indexes'):
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for index in table.indexes:
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self.traverse_single(index)
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table.dispatch.after_create(table, self.connection,
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checkfirst=self.checkfirst,
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_ddl_runner=self)
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def visit_sequence(self, sequence, create_ok=False):
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if not create_ok and not self._can_create_sequence(sequence):
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return
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self.connection.execute(schema.CreateSequence(sequence))
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def visit_index(self, index):
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self.connection.execute(schema.CreateIndex(index))
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class SchemaDropper(DDLBase):
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def __init__(self, dialect, connection, checkfirst=False,
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tables=None, **kwargs):
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super(SchemaDropper, self).__init__(connection, **kwargs)
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self.checkfirst = checkfirst
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self.tables = tables
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self.preparer = dialect.identifier_preparer
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self.dialect = dialect
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self.memo = {}
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def visit_metadata(self, metadata):
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if self.tables is not None:
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tables = self.tables
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else:
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tables = metadata.tables.values()
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collection = [
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t
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for t in reversed(sql_util.sort_tables(tables))
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if self._can_drop_table(t)
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]
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seq_coll = [
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s
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for s in metadata._sequences.values()
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if s.column is None and self._can_drop_sequence(s)
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]
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metadata.dispatch.before_drop(
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metadata, self.connection, tables=collection,
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checkfirst=self.checkfirst, _ddl_runner=self)
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for table in collection:
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self.traverse_single(table, drop_ok=True)
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for seq in seq_coll:
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self.traverse_single(seq, drop_ok=True)
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metadata.dispatch.after_drop(
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metadata, self.connection, tables=collection,
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checkfirst=self.checkfirst, _ddl_runner=self)
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def _can_drop_table(self, table):
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self.dialect.validate_identifier(table.name)
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if table.schema:
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self.dialect.validate_identifier(table.schema)
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return not self.checkfirst or self.dialect.has_table(self.connection,
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table.name, schema=table.schema)
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def _can_drop_sequence(self, sequence):
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return self.dialect.supports_sequences and \
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((not self.dialect.sequences_optional or
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not sequence.optional) and
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(not self.checkfirst or
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self.dialect.has_sequence(
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self.connection,
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sequence.name,
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schema=sequence.schema))
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)
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def visit_index(self, index):
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self.connection.execute(schema.DropIndex(index))
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def visit_table(self, table, drop_ok=False):
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if not drop_ok and not self._can_drop_table(table):
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return
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table.dispatch.before_drop(table, self.connection,
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checkfirst=self.checkfirst,
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_ddl_runner=self)
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for column in table.columns:
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if column.default is not None:
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self.traverse_single(column.default)
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self.connection.execute(schema.DropTable(table))
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table.dispatch.after_drop(table, self.connection,
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checkfirst=self.checkfirst,
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_ddl_runner=self)
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def visit_sequence(self, sequence, drop_ok=False):
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if not drop_ok and not self._can_drop_sequence(sequence):
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return
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self.connection.execute(schema.DropSequence(sequence))
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