451 lines
15 KiB
Python
451 lines
15 KiB
Python
# mysql/reflection.py
|
|
# Copyright (C) 2005-2017 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
|
|
|
|
import re
|
|
from ... import log, util
|
|
from ... import types as sqltypes
|
|
from .enumerated import _EnumeratedValues, SET
|
|
from .types import DATETIME, TIME, TIMESTAMP
|
|
|
|
|
|
class ReflectedState(object):
|
|
"""Stores raw information about a SHOW CREATE TABLE statement."""
|
|
|
|
def __init__(self):
|
|
self.columns = []
|
|
self.table_options = {}
|
|
self.table_name = None
|
|
self.keys = []
|
|
self.constraints = []
|
|
|
|
|
|
@log.class_logger
|
|
class MySQLTableDefinitionParser(object):
|
|
"""Parses the results of a SHOW CREATE TABLE statement."""
|
|
|
|
def __init__(self, dialect, preparer):
|
|
self.dialect = dialect
|
|
self.preparer = preparer
|
|
self._prep_regexes()
|
|
|
|
def parse(self, show_create, charset):
|
|
state = ReflectedState()
|
|
state.charset = charset
|
|
for line in re.split(r'\r?\n', show_create):
|
|
if line.startswith(' ' + self.preparer.initial_quote):
|
|
self._parse_column(line, state)
|
|
# a regular table options line
|
|
elif line.startswith(') '):
|
|
self._parse_table_options(line, state)
|
|
# an ANSI-mode table options line
|
|
elif line == ')':
|
|
pass
|
|
elif line.startswith('CREATE '):
|
|
self._parse_table_name(line, state)
|
|
# Not present in real reflection, but may be if
|
|
# loading from a file.
|
|
elif not line:
|
|
pass
|
|
else:
|
|
type_, spec = self._parse_constraints(line)
|
|
if type_ is None:
|
|
util.warn("Unknown schema content: %r" % line)
|
|
elif type_ == 'key':
|
|
state.keys.append(spec)
|
|
elif type_ == 'constraint':
|
|
state.constraints.append(spec)
|
|
else:
|
|
pass
|
|
return state
|
|
|
|
def _parse_constraints(self, line):
|
|
"""Parse a KEY or CONSTRAINT line.
|
|
|
|
:param line: A line of SHOW CREATE TABLE output
|
|
"""
|
|
|
|
# KEY
|
|
m = self._re_key.match(line)
|
|
if m:
|
|
spec = m.groupdict()
|
|
# convert columns into name, length pairs
|
|
spec['columns'] = self._parse_keyexprs(spec['columns'])
|
|
return 'key', spec
|
|
|
|
# CONSTRAINT
|
|
m = self._re_constraint.match(line)
|
|
if m:
|
|
spec = m.groupdict()
|
|
spec['table'] = \
|
|
self.preparer.unformat_identifiers(spec['table'])
|
|
spec['local'] = [c[0]
|
|
for c in self._parse_keyexprs(spec['local'])]
|
|
spec['foreign'] = [c[0]
|
|
for c in self._parse_keyexprs(spec['foreign'])]
|
|
return 'constraint', spec
|
|
|
|
# PARTITION and SUBPARTITION
|
|
m = self._re_partition.match(line)
|
|
if m:
|
|
# Punt!
|
|
return 'partition', line
|
|
|
|
# No match.
|
|
return (None, line)
|
|
|
|
def _parse_table_name(self, line, state):
|
|
"""Extract the table name.
|
|
|
|
:param line: The first line of SHOW CREATE TABLE
|
|
"""
|
|
|
|
regex, cleanup = self._pr_name
|
|
m = regex.match(line)
|
|
if m:
|
|
state.table_name = cleanup(m.group('name'))
|
|
|
|
def _parse_table_options(self, line, state):
|
|
"""Build a dictionary of all reflected table-level options.
|
|
|
|
:param line: The final line of SHOW CREATE TABLE output.
|
|
"""
|
|
|
|
options = {}
|
|
|
|
if not line or line == ')':
|
|
pass
|
|
|
|
else:
|
|
rest_of_line = line[:]
|
|
for regex, cleanup in self._pr_options:
|
|
m = regex.search(rest_of_line)
|
|
if not m:
|
|
continue
|
|
directive, value = m.group('directive'), m.group('val')
|
|
if cleanup:
|
|
value = cleanup(value)
|
|
options[directive.lower()] = value
|
|
rest_of_line = regex.sub('', rest_of_line)
|
|
|
|
for nope in ('auto_increment', 'data directory', 'index directory'):
|
|
options.pop(nope, None)
|
|
|
|
for opt, val in options.items():
|
|
state.table_options['%s_%s' % (self.dialect.name, opt)] = val
|
|
|
|
def _parse_column(self, line, state):
|
|
"""Extract column details.
|
|
|
|
Falls back to a 'minimal support' variant if full parse fails.
|
|
|
|
:param line: Any column-bearing line from SHOW CREATE TABLE
|
|
"""
|
|
|
|
spec = None
|
|
m = self._re_column.match(line)
|
|
if m:
|
|
spec = m.groupdict()
|
|
spec['full'] = True
|
|
else:
|
|
m = self._re_column_loose.match(line)
|
|
if m:
|
|
spec = m.groupdict()
|
|
spec['full'] = False
|
|
if not spec:
|
|
util.warn("Unknown column definition %r" % line)
|
|
return
|
|
if not spec['full']:
|
|
util.warn("Incomplete reflection of column definition %r" % line)
|
|
|
|
name, type_, args = spec['name'], spec['coltype'], spec['arg']
|
|
|
|
try:
|
|
col_type = self.dialect.ischema_names[type_]
|
|
except KeyError:
|
|
util.warn("Did not recognize type '%s' of column '%s'" %
|
|
(type_, name))
|
|
col_type = sqltypes.NullType
|
|
|
|
# Column type positional arguments eg. varchar(32)
|
|
if args is None or args == '':
|
|
type_args = []
|
|
elif args[0] == "'" and args[-1] == "'":
|
|
type_args = self._re_csv_str.findall(args)
|
|
else:
|
|
type_args = [int(v) for v in self._re_csv_int.findall(args)]
|
|
|
|
# Column type keyword options
|
|
type_kw = {}
|
|
|
|
if issubclass(col_type, (DATETIME, TIME, TIMESTAMP)):
|
|
if type_args:
|
|
type_kw['fsp'] = type_args.pop(0)
|
|
|
|
for kw in ('unsigned', 'zerofill'):
|
|
if spec.get(kw, False):
|
|
type_kw[kw] = True
|
|
for kw in ('charset', 'collate'):
|
|
if spec.get(kw, False):
|
|
type_kw[kw] = spec[kw]
|
|
if issubclass(col_type, _EnumeratedValues):
|
|
type_args = _EnumeratedValues._strip_values(type_args)
|
|
|
|
if issubclass(col_type, SET) and '' in type_args:
|
|
type_kw['retrieve_as_bitwise'] = True
|
|
|
|
type_instance = col_type(*type_args, **type_kw)
|
|
|
|
col_kw = {}
|
|
|
|
# NOT NULL
|
|
col_kw['nullable'] = True
|
|
# this can be "NULL" in the case of TIMESTAMP
|
|
if spec.get('notnull', False) == 'NOT NULL':
|
|
col_kw['nullable'] = False
|
|
|
|
# AUTO_INCREMENT
|
|
if spec.get('autoincr', False):
|
|
col_kw['autoincrement'] = True
|
|
elif issubclass(col_type, sqltypes.Integer):
|
|
col_kw['autoincrement'] = False
|
|
|
|
# DEFAULT
|
|
default = spec.get('default', None)
|
|
|
|
if default == 'NULL':
|
|
# eliminates the need to deal with this later.
|
|
default = None
|
|
|
|
col_d = dict(name=name, type=type_instance, default=default)
|
|
col_d.update(col_kw)
|
|
state.columns.append(col_d)
|
|
|
|
def _describe_to_create(self, table_name, columns):
|
|
"""Re-format DESCRIBE output as a SHOW CREATE TABLE string.
|
|
|
|
DESCRIBE is a much simpler reflection and is sufficient for
|
|
reflecting views for runtime use. This method formats DDL
|
|
for columns only- keys are omitted.
|
|
|
|
:param columns: A sequence of DESCRIBE or SHOW COLUMNS 6-tuples.
|
|
SHOW FULL COLUMNS FROM rows must be rearranged for use with
|
|
this function.
|
|
"""
|
|
|
|
buffer = []
|
|
for row in columns:
|
|
(name, col_type, nullable, default, extra) = \
|
|
[row[i] for i in (0, 1, 2, 4, 5)]
|
|
|
|
line = [' ']
|
|
line.append(self.preparer.quote_identifier(name))
|
|
line.append(col_type)
|
|
if not nullable:
|
|
line.append('NOT NULL')
|
|
if default:
|
|
if 'auto_increment' in default:
|
|
pass
|
|
elif (col_type.startswith('timestamp') and
|
|
default.startswith('C')):
|
|
line.append('DEFAULT')
|
|
line.append(default)
|
|
elif default == 'NULL':
|
|
line.append('DEFAULT')
|
|
line.append(default)
|
|
else:
|
|
line.append('DEFAULT')
|
|
line.append("'%s'" % default.replace("'", "''"))
|
|
if extra:
|
|
line.append(extra)
|
|
|
|
buffer.append(' '.join(line))
|
|
|
|
return ''.join([('CREATE TABLE %s (\n' %
|
|
self.preparer.quote_identifier(table_name)),
|
|
',\n'.join(buffer),
|
|
'\n) '])
|
|
|
|
def _parse_keyexprs(self, identifiers):
|
|
"""Unpack '"col"(2),"col" ASC'-ish strings into components."""
|
|
|
|
return self._re_keyexprs.findall(identifiers)
|
|
|
|
def _prep_regexes(self):
|
|
"""Pre-compile regular expressions."""
|
|
|
|
self._re_columns = []
|
|
self._pr_options = []
|
|
|
|
_final = self.preparer.final_quote
|
|
|
|
quotes = dict(zip(('iq', 'fq', 'esc_fq'),
|
|
[re.escape(s) for s in
|
|
(self.preparer.initial_quote,
|
|
_final,
|
|
self.preparer._escape_identifier(_final))]))
|
|
|
|
self._pr_name = _pr_compile(
|
|
r'^CREATE (?:\w+ +)?TABLE +'
|
|
r'%(iq)s(?P<name>(?:%(esc_fq)s|[^%(fq)s])+)%(fq)s +\($' % quotes,
|
|
self.preparer._unescape_identifier)
|
|
|
|
# `col`,`col2`(32),`col3`(15) DESC
|
|
#
|
|
# Note: ASC and DESC aren't reflected, so we'll punt...
|
|
self._re_keyexprs = _re_compile(
|
|
r'(?:'
|
|
r'(?:%(iq)s((?:%(esc_fq)s|[^%(fq)s])+)%(fq)s)'
|
|
r'(?:\((\d+)\))?(?=\,|$))+' % quotes)
|
|
|
|
# 'foo' or 'foo','bar' or 'fo,o','ba''a''r'
|
|
self._re_csv_str = _re_compile(r'\x27(?:\x27\x27|[^\x27])*\x27')
|
|
|
|
# 123 or 123,456
|
|
self._re_csv_int = _re_compile(r'\d+')
|
|
|
|
# `colname` <type> [type opts]
|
|
# (NOT NULL | NULL)
|
|
# DEFAULT ('value' | CURRENT_TIMESTAMP...)
|
|
# COMMENT 'comment'
|
|
# COLUMN_FORMAT (FIXED|DYNAMIC|DEFAULT)
|
|
# STORAGE (DISK|MEMORY)
|
|
self._re_column = _re_compile(
|
|
r' '
|
|
r'%(iq)s(?P<name>(?:%(esc_fq)s|[^%(fq)s])+)%(fq)s +'
|
|
r'(?P<coltype>\w+)'
|
|
r'(?:\((?P<arg>(?:\d+|\d+,\d+|'
|
|
r'(?:\x27(?:\x27\x27|[^\x27])*\x27,?)+))\))?'
|
|
r'(?: +(?P<unsigned>UNSIGNED))?'
|
|
r'(?: +(?P<zerofill>ZEROFILL))?'
|
|
r'(?: +CHARACTER SET +(?P<charset>[\w_]+))?'
|
|
r'(?: +COLLATE +(?P<collate>[\w_]+))?'
|
|
r'(?: +(?P<notnull>(?:NOT )?NULL))?'
|
|
r'(?: +DEFAULT +(?P<default>'
|
|
r'(?:NULL|\x27(?:\x27\x27|[^\x27])*\x27|\w+'
|
|
r'(?: +ON UPDATE \w+)?)'
|
|
r'))?'
|
|
r'(?: +(?P<autoincr>AUTO_INCREMENT))?'
|
|
r'(?: +COMMENT +(P<comment>(?:\x27\x27|[^\x27])+))?'
|
|
r'(?: +COLUMN_FORMAT +(?P<colfmt>\w+))?'
|
|
r'(?: +STORAGE +(?P<storage>\w+))?'
|
|
r'(?: +(?P<extra>.*))?'
|
|
r',?$'
|
|
% quotes
|
|
)
|
|
|
|
# Fallback, try to parse as little as possible
|
|
self._re_column_loose = _re_compile(
|
|
r' '
|
|
r'%(iq)s(?P<name>(?:%(esc_fq)s|[^%(fq)s])+)%(fq)s +'
|
|
r'(?P<coltype>\w+)'
|
|
r'(?:\((?P<arg>(?:\d+|\d+,\d+|\x27(?:\x27\x27|[^\x27])+\x27))\))?'
|
|
r'.*?(?P<notnull>(?:NOT )NULL)?'
|
|
% quotes
|
|
)
|
|
|
|
# (PRIMARY|UNIQUE|FULLTEXT|SPATIAL) INDEX `name` (USING (BTREE|HASH))?
|
|
# (`col` (ASC|DESC)?, `col` (ASC|DESC)?)
|
|
# KEY_BLOCK_SIZE size | WITH PARSER name
|
|
self._re_key = _re_compile(
|
|
r' '
|
|
r'(?:(?P<type>\S+) )?KEY'
|
|
r'(?: +%(iq)s(?P<name>(?:%(esc_fq)s|[^%(fq)s])+)%(fq)s)?'
|
|
r'(?: +USING +(?P<using_pre>\S+))?'
|
|
r' +\((?P<columns>.+?)\)'
|
|
r'(?: +USING +(?P<using_post>\S+))?'
|
|
r'(?: +KEY_BLOCK_SIZE *[ =]? *(?P<keyblock>\S+))?'
|
|
r'(?: +WITH PARSER +(?P<parser>\S+))?'
|
|
r'(?: +COMMENT +(?P<comment>(\x27\x27|\x27([^\x27])*?\x27)+))?'
|
|
r',?$'
|
|
% quotes
|
|
)
|
|
|
|
# CONSTRAINT `name` FOREIGN KEY (`local_col`)
|
|
# REFERENCES `remote` (`remote_col`)
|
|
# MATCH FULL | MATCH PARTIAL | MATCH SIMPLE
|
|
# ON DELETE CASCADE ON UPDATE RESTRICT
|
|
#
|
|
# unique constraints come back as KEYs
|
|
kw = quotes.copy()
|
|
kw['on'] = 'RESTRICT|CASCADE|SET NULL|NOACTION'
|
|
self._re_constraint = _re_compile(
|
|
r' '
|
|
r'CONSTRAINT +'
|
|
r'%(iq)s(?P<name>(?:%(esc_fq)s|[^%(fq)s])+)%(fq)s +'
|
|
r'FOREIGN KEY +'
|
|
r'\((?P<local>[^\)]+?)\) REFERENCES +'
|
|
r'(?P<table>%(iq)s[^%(fq)s]+%(fq)s'
|
|
r'(?:\.%(iq)s[^%(fq)s]+%(fq)s)?) +'
|
|
r'\((?P<foreign>[^\)]+?)\)'
|
|
r'(?: +(?P<match>MATCH \w+))?'
|
|
r'(?: +ON DELETE (?P<ondelete>%(on)s))?'
|
|
r'(?: +ON UPDATE (?P<onupdate>%(on)s))?'
|
|
% kw
|
|
)
|
|
|
|
# PARTITION
|
|
#
|
|
# punt!
|
|
self._re_partition = _re_compile(r'(?:.*)(?:SUB)?PARTITION(?:.*)')
|
|
|
|
# Table-level options (COLLATE, ENGINE, etc.)
|
|
# Do the string options first, since they have quoted
|
|
# strings we need to get rid of.
|
|
for option in _options_of_type_string:
|
|
self._add_option_string(option)
|
|
|
|
for option in ('ENGINE', 'TYPE', 'AUTO_INCREMENT',
|
|
'AVG_ROW_LENGTH', 'CHARACTER SET',
|
|
'DEFAULT CHARSET', 'CHECKSUM',
|
|
'COLLATE', 'DELAY_KEY_WRITE', 'INSERT_METHOD',
|
|
'MAX_ROWS', 'MIN_ROWS', 'PACK_KEYS', 'ROW_FORMAT',
|
|
'KEY_BLOCK_SIZE'):
|
|
self._add_option_word(option)
|
|
|
|
self._add_option_regex('UNION', r'\([^\)]+\)')
|
|
self._add_option_regex('TABLESPACE', r'.*? STORAGE DISK')
|
|
self._add_option_regex(
|
|
'RAID_TYPE',
|
|
r'\w+\s+RAID_CHUNKS\s*\=\s*\w+RAID_CHUNKSIZE\s*=\s*\w+')
|
|
|
|
_optional_equals = r'(?:\s*(?:=\s*)|\s+)'
|
|
|
|
def _add_option_string(self, directive):
|
|
regex = (r'(?P<directive>%s)%s'
|
|
r"'(?P<val>(?:[^']|'')*?)'(?!')" %
|
|
(re.escape(directive), self._optional_equals))
|
|
self._pr_options.append(_pr_compile(
|
|
regex, lambda v: v.replace("\\\\", "\\").replace("''", "'")
|
|
))
|
|
|
|
def _add_option_word(self, directive):
|
|
regex = (r'(?P<directive>%s)%s'
|
|
r'(?P<val>\w+)' %
|
|
(re.escape(directive), self._optional_equals))
|
|
self._pr_options.append(_pr_compile(regex))
|
|
|
|
def _add_option_regex(self, directive, regex):
|
|
regex = (r'(?P<directive>%s)%s'
|
|
r'(?P<val>%s)' %
|
|
(re.escape(directive), self._optional_equals, regex))
|
|
self._pr_options.append(_pr_compile(regex))
|
|
|
|
_options_of_type_string = ('COMMENT', 'DATA DIRECTORY', 'INDEX DIRECTORY',
|
|
'PASSWORD', 'CONNECTION')
|
|
|
|
|
|
def _pr_compile(regex, cleanup=None):
|
|
"""Prepare a 2-tuple of compiled regex and callable."""
|
|
|
|
return (_re_compile(regex), cleanup)
|
|
|
|
|
|
def _re_compile(regex):
|
|
"""Compile a string to regex, I and UNICODE."""
|
|
|
|
return re.compile(regex, re.I | re.UNICODE)
|