Initial Fork from https://bitbucket.org/raphaelmutschler/calibreserver/

lib/sqlalchemy/engine/ddl.py

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