|
|
"""
|
|
|
`SQLite`_ database specific implementations of changeset classes.
|
|
|
|
|
|
.. _`SQLite`: http://www.sqlite.org/
|
|
|
"""
|
|
|
try: # Python 3
|
|
|
from collections.abc import MutableMapping as DictMixin
|
|
|
except ImportError: # Python 2
|
|
|
from UserDict import DictMixin
|
|
|
from copy import copy
|
|
|
import re
|
|
|
|
|
|
from sqlalchemy.databases import sqlite as sa_base
|
|
|
from sqlalchemy.schema import ForeignKeyConstraint
|
|
|
from sqlalchemy.schema import UniqueConstraint
|
|
|
|
|
|
from rhodecode.lib.dbmigrate.migrate import exceptions
|
|
|
from rhodecode.lib.dbmigrate.migrate.changeset import ansisql
|
|
|
import sqlite3
|
|
|
|
|
|
SQLiteSchemaGenerator = sa_base.SQLiteDDLCompiler
|
|
|
|
|
|
|
|
|
class SQLiteCommon(object):
|
|
|
|
|
|
def _not_supported(self, op):
|
|
|
raise exceptions.NotSupportedError("SQLite does not support "
|
|
|
"%s; see http://www.sqlite.org/lang_altertable.html" % op)
|
|
|
|
|
|
|
|
|
class SQLiteHelper(SQLiteCommon):
|
|
|
|
|
|
def _get_unique_constraints(self, table):
|
|
|
"""Retrieve information about existing unique constraints of the table
|
|
|
|
|
|
This feature is needed for recreate_table() to work properly.
|
|
|
"""
|
|
|
|
|
|
data = table.metadata.bind.execute(
|
|
|
"""SELECT sql
|
|
|
FROM sqlite_master
|
|
|
WHERE
|
|
|
type='table' AND
|
|
|
name=:table_name""",
|
|
|
table_name=table.name
|
|
|
).fetchone()[0]
|
|
|
|
|
|
UNIQUE_PATTERN = "CONSTRAINT (\w+) UNIQUE \(([^\)]+)\)"
|
|
|
constraints = []
|
|
|
for name, cols in re.findall(UNIQUE_PATTERN, data):
|
|
|
# Filter out any columns that were dropped from the table.
|
|
|
columns = []
|
|
|
for c in cols.split(","):
|
|
|
if c in table.columns:
|
|
|
# There was a bug in reflection of SQLite columns with
|
|
|
# reserved identifiers as names (SQLite can return them
|
|
|
# wrapped with double quotes), so strip double quotes.
|
|
|
columns.extend(c.strip(' "'))
|
|
|
if columns:
|
|
|
constraints.extend(UniqueConstraint(*columns, name=name))
|
|
|
return constraints
|
|
|
|
|
|
def recreate_table(self, table, column=None, delta=None,
|
|
|
omit_uniques=None):
|
|
|
table_name = self.preparer.format_table(table)
|
|
|
|
|
|
# we remove all indexes so as not to have
|
|
|
# problems during copy and re-create
|
|
|
for index in table.indexes:
|
|
|
index.drop()
|
|
|
|
|
|
# reflect existing unique constraints
|
|
|
for uc in self._get_unique_constraints(table):
|
|
|
table.append_constraint(uc)
|
|
|
# omit given unique constraints when creating a new table if required
|
|
|
table.constraints = set([
|
|
|
cons for cons in table.constraints
|
|
|
if omit_uniques is None or cons.name not in omit_uniques
|
|
|
])
|
|
|
tup = sqlite3.sqlite_version_info
|
|
|
if tup[0] > 3 or (tup[0] == 3 and tup[1] >= 26):
|
|
|
self.append('PRAGMA legacy_alter_table = ON')
|
|
|
self.execute()
|
|
|
|
|
|
self.append('ALTER TABLE %s RENAME TO migration_tmp' % table_name)
|
|
|
self.execute()
|
|
|
if tup[0] > 3 or (tup[0] == 3 and tup[1] >= 26):
|
|
|
self.append('PRAGMA legacy_alter_table = OFF')
|
|
|
self.execute()
|
|
|
insertion_string = self._modify_table(table, column, delta)
|
|
|
|
|
|
table.create(bind=self.connection)
|
|
|
self.append(insertion_string % {'table_name': table_name})
|
|
|
self.execute()
|
|
|
self.append('DROP TABLE migration_tmp')
|
|
|
self.execute()
|
|
|
|
|
|
def visit_column(self, delta):
|
|
|
if isinstance(delta, DictMixin):
|
|
|
column = delta.result_column
|
|
|
table = self._to_table(delta.table)
|
|
|
else:
|
|
|
column = delta
|
|
|
table = self._to_table(column.table)
|
|
|
|
|
|
self.recreate_table(table,column,delta)
|
|
|
|
|
|
class SQLiteColumnGenerator(SQLiteSchemaGenerator,
|
|
|
ansisql.ANSIColumnGenerator,
|
|
|
# at the end so we get the normal
|
|
|
# visit_column by default
|
|
|
SQLiteHelper,
|
|
|
SQLiteCommon
|
|
|
):
|
|
|
"""SQLite ColumnGenerator"""
|
|
|
|
|
|
def _modify_table(self, table, column, delta):
|
|
|
columns = ' ,'.join(map(
|
|
|
self.preparer.format_column,
|
|
|
[c for c in table.columns if c.name!=column.name]))
|
|
|
return ('INSERT INTO %%(table_name)s (%(cols)s) '
|
|
|
'SELECT %(cols)s from migration_tmp')%{'cols':columns}
|
|
|
|
|
|
def visit_column(self,column):
|
|
|
if column.foreign_keys:
|
|
|
SQLiteHelper.visit_column(self,column)
|
|
|
else:
|
|
|
super(SQLiteColumnGenerator,self).visit_column(column)
|
|
|
|
|
|
class SQLiteColumnDropper(SQLiteHelper, ansisql.ANSIColumnDropper):
|
|
|
"""SQLite ColumnDropper"""
|
|
|
|
|
|
def _modify_table(self, table, column, delta):
|
|
|
|
|
|
columns = ' ,'.join(map(self.preparer.format_column, table.columns))
|
|
|
return 'INSERT INTO %(table_name)s SELECT ' + columns + \
|
|
|
' from migration_tmp'
|
|
|
|
|
|
def visit_column(self,column):
|
|
|
# For SQLite, we *have* to remove the column here so the table
|
|
|
# is re-created properly.
|
|
|
column.remove_from_table(column.table,unset_table=False)
|
|
|
super(SQLiteColumnDropper,self).visit_column(column)
|
|
|
|
|
|
|
|
|
class SQLiteSchemaChanger(SQLiteHelper, ansisql.ANSISchemaChanger):
|
|
|
"""SQLite SchemaChanger"""
|
|
|
|
|
|
def _modify_table(self, table, column, delta):
|
|
|
return 'INSERT INTO %(table_name)s SELECT * from migration_tmp'
|
|
|
|
|
|
def visit_index(self, index):
|
|
|
"""Does not support ALTER INDEX"""
|
|
|
self._not_supported('ALTER INDEX')
|
|
|
|
|
|
|
|
|
class SQLiteConstraintGenerator(ansisql.ANSIConstraintGenerator, SQLiteHelper, SQLiteCommon):
|
|
|
|
|
|
def visit_migrate_primary_key_constraint(self, constraint):
|
|
|
tmpl = "CREATE UNIQUE INDEX %s ON %s ( %s )"
|
|
|
cols = ', '.join(map(self.preparer.format_column, constraint.columns))
|
|
|
tname = self.preparer.format_table(constraint.table)
|
|
|
name = self.get_constraint_name(constraint)
|
|
|
msg = tmpl % (name, tname, cols)
|
|
|
self.append(msg)
|
|
|
self.execute()
|
|
|
|
|
|
def _modify_table(self, table, column, delta):
|
|
|
return 'INSERT INTO %(table_name)s SELECT * from migration_tmp'
|
|
|
|
|
|
def visit_migrate_foreign_key_constraint(self, *p, **k):
|
|
|
self.recreate_table(p[0].table)
|
|
|
|
|
|
def visit_migrate_unique_constraint(self, *p, **k):
|
|
|
self.recreate_table(p[0].table)
|
|
|
|
|
|
|
|
|
class SQLiteConstraintDropper(ansisql.ANSIColumnDropper,
|
|
|
SQLiteHelper,
|
|
|
ansisql.ANSIConstraintCommon):
|
|
|
|
|
|
def _modify_table(self, table, column, delta):
|
|
|
return 'INSERT INTO %(table_name)s SELECT * from migration_tmp'
|
|
|
|
|
|
def visit_migrate_primary_key_constraint(self, constraint):
|
|
|
tmpl = "DROP INDEX %s "
|
|
|
name = self.get_constraint_name(constraint)
|
|
|
msg = tmpl % (name)
|
|
|
self.append(msg)
|
|
|
self.execute()
|
|
|
|
|
|
def visit_migrate_foreign_key_constraint(self, *p, **k):
|
|
|
self._not_supported('ALTER TABLE DROP CONSTRAINT')
|
|
|
|
|
|
def visit_migrate_check_constraint(self, *p, **k):
|
|
|
self._not_supported('ALTER TABLE DROP CONSTRAINT')
|
|
|
|
|
|
def visit_migrate_unique_constraint(self, *p, **k):
|
|
|
self.recreate_table(p[0].table, omit_uniques=[p[0].name])
|
|
|
|
|
|
|
|
|
# TODO: technically primary key is a NOT NULL + UNIQUE constraint, should add NOT NULL to index
|
|
|
|
|
|
class SQLiteDialect(ansisql.ANSIDialect):
|
|
|
columngenerator = SQLiteColumnGenerator
|
|
|
columndropper = SQLiteColumnDropper
|
|
|
schemachanger = SQLiteSchemaChanger
|
|
|
constraintgenerator = SQLiteConstraintGenerator
|
|
|
constraintdropper = SQLiteConstraintDropper
|
|
|
|
