Remove submodule, just put Dependencies in ./libs

libs/migrate/changeset/databases/mysql.py

@@ -0,0 +1,94 @@
+"""
+   MySQL database specific implementations of changeset classes.
+"""
+
+from sqlalchemy.databases import mysql as sa_base
+from sqlalchemy import types as sqltypes
+
+from migrate import exceptions
+from migrate.changeset import ansisql, SQLA_06
+
+
+if not SQLA_06:
+    MySQLSchemaGenerator = sa_base.MySQLSchemaGenerator
+else:
+    MySQLSchemaGenerator = sa_base.MySQLDDLCompiler
+
+class MySQLColumnGenerator(MySQLSchemaGenerator, ansisql.ANSIColumnGenerator):
+    pass
+
+
+class MySQLColumnDropper(ansisql.ANSIColumnDropper):
+    pass
+
+
+class MySQLSchemaChanger(MySQLSchemaGenerator, ansisql.ANSISchemaChanger):
+
+    def visit_column(self, delta):
+        table = delta.table
+        colspec = self.get_column_specification(delta.result_column)
+        if delta.result_column.autoincrement:
+            primary_keys = [c for c in table.primary_key.columns
+                       if (c.autoincrement and
+                            isinstance(c.type, sqltypes.Integer) and
+                            not c.foreign_keys)]
+
+            if primary_keys:
+                first = primary_keys.pop(0)
+                if first.name == delta.current_name:
+                    colspec += " AUTO_INCREMENT"
+        old_col_name = self.preparer.quote(delta.current_name, table.quote)
+
+        self.start_alter_table(table)
+
+        self.append("CHANGE COLUMN %s " % old_col_name)
+        self.append(colspec)
+        self.execute()
+
+    def visit_index(self, param):
+        # If MySQL can do this, I can't find how
+        raise exceptions.NotSupportedError("MySQL cannot rename indexes")
+
+
+class MySQLConstraintGenerator(ansisql.ANSIConstraintGenerator):
+    pass
+
+if SQLA_06:
+    class MySQLConstraintDropper(MySQLSchemaGenerator, ansisql.ANSIConstraintDropper):
+        def visit_migrate_check_constraint(self, *p, **k):
+            raise exceptions.NotSupportedError("MySQL does not support CHECK"
+                " constraints, use triggers instead.")
+
+else:
+    class MySQLConstraintDropper(ansisql.ANSIConstraintDropper):
+
+        def visit_migrate_primary_key_constraint(self, constraint):
+            self.start_alter_table(constraint)
+            self.append("DROP PRIMARY KEY")
+            self.execute()
+
+        def visit_migrate_foreign_key_constraint(self, constraint):
+            self.start_alter_table(constraint)
+            self.append("DROP FOREIGN KEY ")
+            constraint.name = self.get_constraint_name(constraint)
+            self.append(self.preparer.format_constraint(constraint))
+            self.execute()
+
+        def visit_migrate_check_constraint(self, *p, **k):
+            raise exceptions.NotSupportedError("MySQL does not support CHECK"
+                " constraints, use triggers instead.")
+
+        def visit_migrate_unique_constraint(self, constraint, *p, **k):
+            self.start_alter_table(constraint)
+            self.append('DROP INDEX ')
+            constraint.name = self.get_constraint_name(constraint)
+            self.append(self.preparer.format_constraint(constraint))
+            self.execute()
+
+
+class MySQLDialect(ansisql.ANSIDialect):
+    columngenerator = MySQLColumnGenerator
+    columndropper = MySQLColumnDropper
+    schemachanger = MySQLSchemaChanger
+    constraintgenerator = MySQLConstraintGenerator
+    constraintdropper = MySQLConstraintDropper