840 lines
29 KiB
Python
840 lines
29 KiB
Python
# sybase/base.py
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# Copyright (C) 2010-2018 the SQLAlchemy authors and contributors
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# <see AUTHORS file>
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# get_select_precolumns(), limit_clause() implementation
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# copyright (C) 2007 Fisch Asset Management
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# AG http://www.fam.ch, with coding by Alexander Houben
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# alexander.houben@thor-solutions.ch
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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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"""
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.. dialect:: sybase
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:name: Sybase
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.. note::
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The Sybase dialect functions on current SQLAlchemy versions
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but is not regularly tested, and may have many issues and
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caveats not currently handled.
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"""
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import operator
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import re
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from sqlalchemy.sql import compiler, expression, text, bindparam
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from sqlalchemy.engine import default, base, reflection
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from sqlalchemy import types as sqltypes
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from sqlalchemy.sql import operators as sql_operators
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from sqlalchemy import schema as sa_schema
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from sqlalchemy import util, sql, exc
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from sqlalchemy.types import CHAR, VARCHAR, TIME, NCHAR, NVARCHAR,\
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TEXT, DATE, DATETIME, FLOAT, NUMERIC,\
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BIGINT, INT, INTEGER, SMALLINT, BINARY,\
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VARBINARY, DECIMAL, TIMESTAMP, Unicode,\
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UnicodeText, REAL
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RESERVED_WORDS = set([
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"add", "all", "alter", "and",
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"any", "as", "asc", "backup",
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"begin", "between", "bigint", "binary",
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"bit", "bottom", "break", "by",
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"call", "capability", "cascade", "case",
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"cast", "char", "char_convert", "character",
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"check", "checkpoint", "close", "comment",
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"commit", "connect", "constraint", "contains",
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"continue", "convert", "create", "cross",
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"cube", "current", "current_timestamp", "current_user",
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"cursor", "date", "dbspace", "deallocate",
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"dec", "decimal", "declare", "default",
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"delete", "deleting", "desc", "distinct",
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"do", "double", "drop", "dynamic",
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"else", "elseif", "encrypted", "end",
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"endif", "escape", "except", "exception",
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"exec", "execute", "existing", "exists",
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"externlogin", "fetch", "first", "float",
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"for", "force", "foreign", "forward",
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"from", "full", "goto", "grant",
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"group", "having", "holdlock", "identified",
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"if", "in", "index", "index_lparen",
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"inner", "inout", "insensitive", "insert",
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"inserting", "install", "instead", "int",
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"integer", "integrated", "intersect", "into",
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"iq", "is", "isolation", "join",
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"key", "lateral", "left", "like",
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"lock", "login", "long", "match",
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"membership", "message", "mode", "modify",
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"natural", "new", "no", "noholdlock",
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"not", "notify", "null", "numeric",
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"of", "off", "on", "open",
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"option", "options", "or", "order",
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"others", "out", "outer", "over",
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"passthrough", "precision", "prepare", "primary",
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"print", "privileges", "proc", "procedure",
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"publication", "raiserror", "readtext", "real",
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"reference", "references", "release", "remote",
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"remove", "rename", "reorganize", "resource",
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"restore", "restrict", "return", "revoke",
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"right", "rollback", "rollup", "save",
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"savepoint", "scroll", "select", "sensitive",
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"session", "set", "setuser", "share",
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"smallint", "some", "sqlcode", "sqlstate",
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"start", "stop", "subtrans", "subtransaction",
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"synchronize", "syntax_error", "table", "temporary",
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"then", "time", "timestamp", "tinyint",
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"to", "top", "tran", "trigger",
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"truncate", "tsequal", "unbounded", "union",
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"unique", "unknown", "unsigned", "update",
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"updating", "user", "using", "validate",
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"values", "varbinary", "varchar", "variable",
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"varying", "view", "wait", "waitfor",
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"when", "where", "while", "window",
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"with", "with_cube", "with_lparen", "with_rollup",
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"within", "work", "writetext",
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])
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class _SybaseUnitypeMixin(object):
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"""these types appear to return a buffer object."""
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def result_processor(self, dialect, coltype):
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def process(value):
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if value is not None:
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return str(value) # decode("ucs-2")
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else:
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return None
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return process
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class UNICHAR(_SybaseUnitypeMixin, sqltypes.Unicode):
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__visit_name__ = 'UNICHAR'
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class UNIVARCHAR(_SybaseUnitypeMixin, sqltypes.Unicode):
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__visit_name__ = 'UNIVARCHAR'
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class UNITEXT(_SybaseUnitypeMixin, sqltypes.UnicodeText):
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__visit_name__ = 'UNITEXT'
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class TINYINT(sqltypes.Integer):
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__visit_name__ = 'TINYINT'
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class BIT(sqltypes.TypeEngine):
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__visit_name__ = 'BIT'
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class MONEY(sqltypes.TypeEngine):
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__visit_name__ = "MONEY"
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class SMALLMONEY(sqltypes.TypeEngine):
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__visit_name__ = "SMALLMONEY"
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class UNIQUEIDENTIFIER(sqltypes.TypeEngine):
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__visit_name__ = "UNIQUEIDENTIFIER"
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class IMAGE(sqltypes.LargeBinary):
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__visit_name__ = 'IMAGE'
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class SybaseTypeCompiler(compiler.GenericTypeCompiler):
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def visit_large_binary(self, type_, **kw):
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return self.visit_IMAGE(type_)
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def visit_boolean(self, type_, **kw):
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return self.visit_BIT(type_)
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def visit_unicode(self, type_, **kw):
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return self.visit_NVARCHAR(type_)
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def visit_UNICHAR(self, type_, **kw):
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return "UNICHAR(%d)" % type_.length
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def visit_UNIVARCHAR(self, type_, **kw):
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return "UNIVARCHAR(%d)" % type_.length
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def visit_UNITEXT(self, type_, **kw):
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return "UNITEXT"
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def visit_TINYINT(self, type_, **kw):
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return "TINYINT"
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def visit_IMAGE(self, type_, **kw):
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return "IMAGE"
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def visit_BIT(self, type_, **kw):
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return "BIT"
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def visit_MONEY(self, type_, **kw):
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return "MONEY"
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def visit_SMALLMONEY(self, type_, **kw):
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return "SMALLMONEY"
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def visit_UNIQUEIDENTIFIER(self, type_, **kw):
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return "UNIQUEIDENTIFIER"
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ischema_names = {
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'bigint': BIGINT,
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'int': INTEGER,
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'integer': INTEGER,
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'smallint': SMALLINT,
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'tinyint': TINYINT,
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'unsigned bigint': BIGINT, # TODO: unsigned flags
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'unsigned int': INTEGER, # TODO: unsigned flags
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'unsigned smallint': SMALLINT, # TODO: unsigned flags
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'numeric': NUMERIC,
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'decimal': DECIMAL,
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'dec': DECIMAL,
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'float': FLOAT,
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'double': NUMERIC, # TODO
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'double precision': NUMERIC, # TODO
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'real': REAL,
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'smallmoney': SMALLMONEY,
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'money': MONEY,
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'smalldatetime': DATETIME,
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'datetime': DATETIME,
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'date': DATE,
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'time': TIME,
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'char': CHAR,
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'character': CHAR,
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'varchar': VARCHAR,
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'character varying': VARCHAR,
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'char varying': VARCHAR,
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'unichar': UNICHAR,
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'unicode character': UNIVARCHAR,
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'nchar': NCHAR,
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'national char': NCHAR,
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'national character': NCHAR,
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'nvarchar': NVARCHAR,
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'nchar varying': NVARCHAR,
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'national char varying': NVARCHAR,
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'national character varying': NVARCHAR,
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'text': TEXT,
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'unitext': UNITEXT,
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'binary': BINARY,
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'varbinary': VARBINARY,
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'image': IMAGE,
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'bit': BIT,
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# not in documentation for ASE 15.7
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'long varchar': TEXT, # TODO
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'timestamp': TIMESTAMP,
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'uniqueidentifier': UNIQUEIDENTIFIER,
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}
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class SybaseInspector(reflection.Inspector):
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def __init__(self, conn):
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reflection.Inspector.__init__(self, conn)
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def get_table_id(self, table_name, schema=None):
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"""Return the table id from `table_name` and `schema`."""
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return self.dialect.get_table_id(self.bind, table_name, schema,
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info_cache=self.info_cache)
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class SybaseExecutionContext(default.DefaultExecutionContext):
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_enable_identity_insert = False
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def set_ddl_autocommit(self, connection, value):
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"""Must be implemented by subclasses to accommodate DDL executions.
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"connection" is the raw unwrapped DBAPI connection. "value"
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is True or False. when True, the connection should be configured
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such that a DDL can take place subsequently. when False,
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a DDL has taken place and the connection should be resumed
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into non-autocommit mode.
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"""
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raise NotImplementedError()
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def pre_exec(self):
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if self.isinsert:
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tbl = self.compiled.statement.table
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seq_column = tbl._autoincrement_column
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insert_has_sequence = seq_column is not None
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if insert_has_sequence:
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self._enable_identity_insert = \
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seq_column.key in self.compiled_parameters[0]
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else:
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self._enable_identity_insert = False
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if self._enable_identity_insert:
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self.cursor.execute(
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"SET IDENTITY_INSERT %s ON" %
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self.dialect.identifier_preparer.format_table(tbl))
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if self.isddl:
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# TODO: to enhance this, we can detect "ddl in tran" on the
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# database settings. this error message should be improved to
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# include a note about that.
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if not self.should_autocommit:
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raise exc.InvalidRequestError(
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"The Sybase dialect only supports "
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"DDL in 'autocommit' mode at this time.")
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self.root_connection.engine.logger.info(
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"AUTOCOMMIT (Assuming no Sybase 'ddl in tran')")
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self.set_ddl_autocommit(
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self.root_connection.connection.connection,
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True)
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def post_exec(self):
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if self.isddl:
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self.set_ddl_autocommit(self.root_connection, False)
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if self._enable_identity_insert:
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self.cursor.execute(
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"SET IDENTITY_INSERT %s OFF" %
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self.dialect.identifier_preparer.
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format_table(self.compiled.statement.table)
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)
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def get_lastrowid(self):
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cursor = self.create_cursor()
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cursor.execute("SELECT @@identity AS lastrowid")
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lastrowid = cursor.fetchone()[0]
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cursor.close()
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return lastrowid
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class SybaseSQLCompiler(compiler.SQLCompiler):
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ansi_bind_rules = True
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extract_map = util.update_copy(
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compiler.SQLCompiler.extract_map,
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{
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'doy': 'dayofyear',
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'dow': 'weekday',
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'milliseconds': 'millisecond'
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})
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def get_select_precolumns(self, select, **kw):
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s = select._distinct and "DISTINCT " or ""
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# TODO: don't think Sybase supports
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# bind params for FIRST / TOP
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limit = select._limit
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if limit:
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# if select._limit == 1:
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# s += "FIRST "
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# else:
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# s += "TOP %s " % (select._limit,)
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s += "TOP %s " % (limit,)
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offset = select._offset
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if offset:
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raise NotImplementedError("Sybase ASE does not support OFFSET")
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return s
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def get_from_hint_text(self, table, text):
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return text
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def limit_clause(self, select, **kw):
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# Limit in sybase is after the select keyword
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return ""
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def visit_extract(self, extract, **kw):
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field = self.extract_map.get(extract.field, extract.field)
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return 'DATEPART("%s", %s)' % (
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field, self.process(extract.expr, **kw))
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def visit_now_func(self, fn, **kw):
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return "GETDATE()"
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def for_update_clause(self, select):
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# "FOR UPDATE" is only allowed on "DECLARE CURSOR"
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# which SQLAlchemy doesn't use
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return ''
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def order_by_clause(self, select, **kw):
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kw['literal_binds'] = True
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order_by = self.process(select._order_by_clause, **kw)
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# SybaseSQL only allows ORDER BY in subqueries if there is a LIMIT
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if order_by and (not self.is_subquery() or select._limit):
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return " ORDER BY " + order_by
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else:
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return ""
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def delete_table_clause(self, delete_stmt, from_table,
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extra_froms):
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"""If we have extra froms make sure we render any alias as hint."""
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ashint = False
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if extra_froms:
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ashint = True
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return from_table._compiler_dispatch(
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self, asfrom=True, iscrud=True, ashint=ashint
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)
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def delete_extra_from_clause(self, delete_stmt, from_table,
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extra_froms, from_hints, **kw):
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"""Render the DELETE .. FROM clause specific to Sybase."""
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return "FROM " + ', '.join(
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t._compiler_dispatch(self, asfrom=True,
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fromhints=from_hints, **kw)
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for t in [from_table] + extra_froms)
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class SybaseDDLCompiler(compiler.DDLCompiler):
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def get_column_specification(self, column, **kwargs):
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colspec = self.preparer.format_column(column) + " " + \
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self.dialect.type_compiler.process(
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column.type, type_expression=column)
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if column.table is None:
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raise exc.CompileError(
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"The Sybase dialect requires Table-bound "
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"columns in order to generate DDL")
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seq_col = column.table._autoincrement_column
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# install a IDENTITY Sequence if we have an implicit IDENTITY column
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if seq_col is column:
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sequence = isinstance(column.default, sa_schema.Sequence) \
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and column.default
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if sequence:
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start, increment = sequence.start or 1, \
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sequence.increment or 1
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else:
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start, increment = 1, 1
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if (start, increment) == (1, 1):
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colspec += " IDENTITY"
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else:
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# TODO: need correct syntax for this
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colspec += " IDENTITY(%s,%s)" % (start, increment)
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else:
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default = self.get_column_default_string(column)
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if default is not None:
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colspec += " DEFAULT " + default
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if column.nullable is not None:
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if not column.nullable or column.primary_key:
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colspec += " NOT NULL"
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else:
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colspec += " NULL"
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return colspec
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def visit_drop_index(self, drop):
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index = drop.element
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return "\nDROP INDEX %s.%s" % (
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self.preparer.quote_identifier(index.table.name),
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self._prepared_index_name(drop.element,
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include_schema=False)
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)
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class SybaseIdentifierPreparer(compiler.IdentifierPreparer):
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reserved_words = RESERVED_WORDS
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class SybaseDialect(default.DefaultDialect):
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name = 'sybase'
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supports_unicode_statements = False
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supports_sane_rowcount = False
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supports_sane_multi_rowcount = False
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supports_native_boolean = False
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supports_unicode_binds = False
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postfetch_lastrowid = True
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colspecs = {}
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ischema_names = ischema_names
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type_compiler = SybaseTypeCompiler
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statement_compiler = SybaseSQLCompiler
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ddl_compiler = SybaseDDLCompiler
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preparer = SybaseIdentifierPreparer
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inspector = SybaseInspector
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construct_arguments = []
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def _get_default_schema_name(self, connection):
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return connection.scalar(
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text("SELECT user_name() as user_name",
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typemap={'user_name': Unicode})
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)
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def initialize(self, connection):
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super(SybaseDialect, self).initialize(connection)
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if self.server_version_info is not None and\
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self.server_version_info < (15, ):
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self.max_identifier_length = 30
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else:
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self.max_identifier_length = 255
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def get_table_id(self, connection, table_name, schema=None, **kw):
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"""Fetch the id for schema.table_name.
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Several reflection methods require the table id. The idea for using
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this method is that it can be fetched one time and cached for
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subsequent calls.
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"""
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table_id = None
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if schema is None:
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schema = self.default_schema_name
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TABLEID_SQL = text("""
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SELECT o.id AS id
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FROM sysobjects o JOIN sysusers u ON o.uid=u.uid
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WHERE u.name = :schema_name
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AND o.name = :table_name
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AND o.type in ('U', 'V')
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""")
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if util.py2k:
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if isinstance(schema, unicode):
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schema = schema.encode("ascii")
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if isinstance(table_name, unicode):
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table_name = table_name.encode("ascii")
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result = connection.execute(TABLEID_SQL,
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schema_name=schema,
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table_name=table_name)
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table_id = result.scalar()
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if table_id is None:
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raise exc.NoSuchTableError(table_name)
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return table_id
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@reflection.cache
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def get_columns(self, connection, table_name, schema=None, **kw):
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table_id = self.get_table_id(connection, table_name, schema,
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info_cache=kw.get("info_cache"))
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COLUMN_SQL = text("""
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SELECT col.name AS name,
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t.name AS type,
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(col.status & 8) AS nullable,
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(col.status & 128) AS autoincrement,
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com.text AS 'default',
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|
col.prec AS precision,
|
|
col.scale AS scale,
|
|
col.length AS length
|
|
FROM systypes t, syscolumns col LEFT OUTER JOIN syscomments com ON
|
|
col.cdefault = com.id
|
|
WHERE col.usertype = t.usertype
|
|
AND col.id = :table_id
|
|
ORDER BY col.colid
|
|
""")
|
|
|
|
results = connection.execute(COLUMN_SQL, table_id=table_id)
|
|
|
|
columns = []
|
|
for (name, type_, nullable, autoincrement, default, precision, scale,
|
|
length) in results:
|
|
col_info = self._get_column_info(name, type_, bool(nullable),
|
|
bool(autoincrement),
|
|
default, precision, scale,
|
|
length)
|
|
columns.append(col_info)
|
|
|
|
return columns
|
|
|
|
def _get_column_info(self, name, type_, nullable, autoincrement, default,
|
|
precision, scale, length):
|
|
|
|
coltype = self.ischema_names.get(type_, None)
|
|
|
|
kwargs = {}
|
|
|
|
if coltype in (NUMERIC, DECIMAL):
|
|
args = (precision, scale)
|
|
elif coltype == FLOAT:
|
|
args = (precision,)
|
|
elif coltype in (CHAR, VARCHAR, UNICHAR, UNIVARCHAR, NCHAR, NVARCHAR):
|
|
args = (length,)
|
|
else:
|
|
args = ()
|
|
|
|
if coltype:
|
|
coltype = coltype(*args, **kwargs)
|
|
# is this necessary
|
|
# if is_array:
|
|
# coltype = ARRAY(coltype)
|
|
else:
|
|
util.warn("Did not recognize type '%s' of column '%s'" %
|
|
(type_, name))
|
|
coltype = sqltypes.NULLTYPE
|
|
|
|
if default:
|
|
default = default.replace("DEFAULT", "").strip()
|
|
default = re.sub("^'(.*)'$", lambda m: m.group(1), default)
|
|
else:
|
|
default = None
|
|
|
|
column_info = dict(name=name, type=coltype, nullable=nullable,
|
|
default=default, autoincrement=autoincrement)
|
|
return column_info
|
|
|
|
@reflection.cache
|
|
def get_foreign_keys(self, connection, table_name, schema=None, **kw):
|
|
|
|
table_id = self.get_table_id(connection, table_name, schema,
|
|
info_cache=kw.get("info_cache"))
|
|
|
|
table_cache = {}
|
|
column_cache = {}
|
|
foreign_keys = []
|
|
|
|
table_cache[table_id] = {"name": table_name, "schema": schema}
|
|
|
|
COLUMN_SQL = text("""
|
|
SELECT c.colid AS id, c.name AS name
|
|
FROM syscolumns c
|
|
WHERE c.id = :table_id
|
|
""")
|
|
|
|
results = connection.execute(COLUMN_SQL, table_id=table_id)
|
|
columns = {}
|
|
for col in results:
|
|
columns[col["id"]] = col["name"]
|
|
column_cache[table_id] = columns
|
|
|
|
REFCONSTRAINT_SQL = text("""
|
|
SELECT o.name AS name, r.reftabid AS reftable_id,
|
|
r.keycnt AS 'count',
|
|
r.fokey1 AS fokey1, r.fokey2 AS fokey2, r.fokey3 AS fokey3,
|
|
r.fokey4 AS fokey4, r.fokey5 AS fokey5, r.fokey6 AS fokey6,
|
|
r.fokey7 AS fokey7, r.fokey1 AS fokey8, r.fokey9 AS fokey9,
|
|
r.fokey10 AS fokey10, r.fokey11 AS fokey11, r.fokey12 AS fokey12,
|
|
r.fokey13 AS fokey13, r.fokey14 AS fokey14, r.fokey15 AS fokey15,
|
|
r.fokey16 AS fokey16,
|
|
r.refkey1 AS refkey1, r.refkey2 AS refkey2, r.refkey3 AS refkey3,
|
|
r.refkey4 AS refkey4, r.refkey5 AS refkey5, r.refkey6 AS refkey6,
|
|
r.refkey7 AS refkey7, r.refkey1 AS refkey8, r.refkey9 AS refkey9,
|
|
r.refkey10 AS refkey10, r.refkey11 AS refkey11,
|
|
r.refkey12 AS refkey12, r.refkey13 AS refkey13,
|
|
r.refkey14 AS refkey14, r.refkey15 AS refkey15,
|
|
r.refkey16 AS refkey16
|
|
FROM sysreferences r JOIN sysobjects o on r.tableid = o.id
|
|
WHERE r.tableid = :table_id
|
|
""")
|
|
referential_constraints = connection.execute(
|
|
REFCONSTRAINT_SQL, table_id=table_id).fetchall()
|
|
|
|
REFTABLE_SQL = text("""
|
|
SELECT o.name AS name, u.name AS 'schema'
|
|
FROM sysobjects o JOIN sysusers u ON o.uid = u.uid
|
|
WHERE o.id = :table_id
|
|
""")
|
|
|
|
for r in referential_constraints:
|
|
reftable_id = r["reftable_id"]
|
|
|
|
if reftable_id not in table_cache:
|
|
c = connection.execute(REFTABLE_SQL, table_id=reftable_id)
|
|
reftable = c.fetchone()
|
|
c.close()
|
|
table_info = {"name": reftable["name"], "schema": None}
|
|
if (schema is not None or
|
|
reftable["schema"] != self.default_schema_name):
|
|
table_info["schema"] = reftable["schema"]
|
|
|
|
table_cache[reftable_id] = table_info
|
|
results = connection.execute(COLUMN_SQL, table_id=reftable_id)
|
|
reftable_columns = {}
|
|
for col in results:
|
|
reftable_columns[col["id"]] = col["name"]
|
|
column_cache[reftable_id] = reftable_columns
|
|
|
|
reftable = table_cache[reftable_id]
|
|
reftable_columns = column_cache[reftable_id]
|
|
|
|
constrained_columns = []
|
|
referred_columns = []
|
|
for i in range(1, r["count"] + 1):
|
|
constrained_columns.append(columns[r["fokey%i" % i]])
|
|
referred_columns.append(reftable_columns[r["refkey%i" % i]])
|
|
|
|
fk_info = {
|
|
"constrained_columns": constrained_columns,
|
|
"referred_schema": reftable["schema"],
|
|
"referred_table": reftable["name"],
|
|
"referred_columns": referred_columns,
|
|
"name": r["name"]
|
|
}
|
|
|
|
foreign_keys.append(fk_info)
|
|
|
|
return foreign_keys
|
|
|
|
@reflection.cache
|
|
def get_indexes(self, connection, table_name, schema=None, **kw):
|
|
table_id = self.get_table_id(connection, table_name, schema,
|
|
info_cache=kw.get("info_cache"))
|
|
|
|
INDEX_SQL = text("""
|
|
SELECT object_name(i.id) AS table_name,
|
|
i.keycnt AS 'count',
|
|
i.name AS name,
|
|
(i.status & 0x2) AS 'unique',
|
|
index_col(object_name(i.id), i.indid, 1) AS col_1,
|
|
index_col(object_name(i.id), i.indid, 2) AS col_2,
|
|
index_col(object_name(i.id), i.indid, 3) AS col_3,
|
|
index_col(object_name(i.id), i.indid, 4) AS col_4,
|
|
index_col(object_name(i.id), i.indid, 5) AS col_5,
|
|
index_col(object_name(i.id), i.indid, 6) AS col_6,
|
|
index_col(object_name(i.id), i.indid, 7) AS col_7,
|
|
index_col(object_name(i.id), i.indid, 8) AS col_8,
|
|
index_col(object_name(i.id), i.indid, 9) AS col_9,
|
|
index_col(object_name(i.id), i.indid, 10) AS col_10,
|
|
index_col(object_name(i.id), i.indid, 11) AS col_11,
|
|
index_col(object_name(i.id), i.indid, 12) AS col_12,
|
|
index_col(object_name(i.id), i.indid, 13) AS col_13,
|
|
index_col(object_name(i.id), i.indid, 14) AS col_14,
|
|
index_col(object_name(i.id), i.indid, 15) AS col_15,
|
|
index_col(object_name(i.id), i.indid, 16) AS col_16
|
|
FROM sysindexes i, sysobjects o
|
|
WHERE o.id = i.id
|
|
AND o.id = :table_id
|
|
AND (i.status & 2048) = 0
|
|
AND i.indid BETWEEN 1 AND 254
|
|
""")
|
|
|
|
results = connection.execute(INDEX_SQL, table_id=table_id)
|
|
indexes = []
|
|
for r in results:
|
|
column_names = []
|
|
for i in range(1, r["count"]):
|
|
column_names.append(r["col_%i" % (i,)])
|
|
index_info = {"name": r["name"],
|
|
"unique": bool(r["unique"]),
|
|
"column_names": column_names}
|
|
indexes.append(index_info)
|
|
|
|
return indexes
|
|
|
|
@reflection.cache
|
|
def get_pk_constraint(self, connection, table_name, schema=None, **kw):
|
|
table_id = self.get_table_id(connection, table_name, schema,
|
|
info_cache=kw.get("info_cache"))
|
|
|
|
PK_SQL = text("""
|
|
SELECT object_name(i.id) AS table_name,
|
|
i.keycnt AS 'count',
|
|
i.name AS name,
|
|
index_col(object_name(i.id), i.indid, 1) AS pk_1,
|
|
index_col(object_name(i.id), i.indid, 2) AS pk_2,
|
|
index_col(object_name(i.id), i.indid, 3) AS pk_3,
|
|
index_col(object_name(i.id), i.indid, 4) AS pk_4,
|
|
index_col(object_name(i.id), i.indid, 5) AS pk_5,
|
|
index_col(object_name(i.id), i.indid, 6) AS pk_6,
|
|
index_col(object_name(i.id), i.indid, 7) AS pk_7,
|
|
index_col(object_name(i.id), i.indid, 8) AS pk_8,
|
|
index_col(object_name(i.id), i.indid, 9) AS pk_9,
|
|
index_col(object_name(i.id), i.indid, 10) AS pk_10,
|
|
index_col(object_name(i.id), i.indid, 11) AS pk_11,
|
|
index_col(object_name(i.id), i.indid, 12) AS pk_12,
|
|
index_col(object_name(i.id), i.indid, 13) AS pk_13,
|
|
index_col(object_name(i.id), i.indid, 14) AS pk_14,
|
|
index_col(object_name(i.id), i.indid, 15) AS pk_15,
|
|
index_col(object_name(i.id), i.indid, 16) AS pk_16
|
|
FROM sysindexes i, sysobjects o
|
|
WHERE o.id = i.id
|
|
AND o.id = :table_id
|
|
AND (i.status & 2048) = 2048
|
|
AND i.indid BETWEEN 1 AND 254
|
|
""")
|
|
|
|
results = connection.execute(PK_SQL, table_id=table_id)
|
|
pks = results.fetchone()
|
|
results.close()
|
|
|
|
constrained_columns = []
|
|
if pks:
|
|
for i in range(1, pks["count"] + 1):
|
|
constrained_columns.append(pks["pk_%i" % (i,)])
|
|
return {"constrained_columns": constrained_columns,
|
|
"name": pks["name"]}
|
|
else:
|
|
return {"constrained_columns": [], "name": None}
|
|
|
|
@reflection.cache
|
|
def get_schema_names(self, connection, **kw):
|
|
|
|
SCHEMA_SQL = text("SELECT u.name AS name FROM sysusers u")
|
|
|
|
schemas = connection.execute(SCHEMA_SQL)
|
|
|
|
return [s["name"] for s in schemas]
|
|
|
|
@reflection.cache
|
|
def get_table_names(self, connection, schema=None, **kw):
|
|
if schema is None:
|
|
schema = self.default_schema_name
|
|
|
|
TABLE_SQL = text("""
|
|
SELECT o.name AS name
|
|
FROM sysobjects o JOIN sysusers u ON o.uid = u.uid
|
|
WHERE u.name = :schema_name
|
|
AND o.type = 'U'
|
|
""")
|
|
|
|
if util.py2k:
|
|
if isinstance(schema, unicode):
|
|
schema = schema.encode("ascii")
|
|
|
|
tables = connection.execute(TABLE_SQL, schema_name=schema)
|
|
|
|
return [t["name"] for t in tables]
|
|
|
|
@reflection.cache
|
|
def get_view_definition(self, connection, view_name, schema=None, **kw):
|
|
if schema is None:
|
|
schema = self.default_schema_name
|
|
|
|
VIEW_DEF_SQL = text("""
|
|
SELECT c.text
|
|
FROM syscomments c JOIN sysobjects o ON c.id = o.id
|
|
WHERE o.name = :view_name
|
|
AND o.type = 'V'
|
|
""")
|
|
|
|
if util.py2k:
|
|
if isinstance(view_name, unicode):
|
|
view_name = view_name.encode("ascii")
|
|
|
|
view = connection.execute(VIEW_DEF_SQL, view_name=view_name)
|
|
|
|
return view.scalar()
|
|
|
|
@reflection.cache
|
|
def get_view_names(self, connection, schema=None, **kw):
|
|
if schema is None:
|
|
schema = self.default_schema_name
|
|
|
|
VIEW_SQL = text("""
|
|
SELECT o.name AS name
|
|
FROM sysobjects o JOIN sysusers u ON o.uid = u.uid
|
|
WHERE u.name = :schema_name
|
|
AND o.type = 'V'
|
|
""")
|
|
|
|
if util.py2k:
|
|
if isinstance(schema, unicode):
|
|
schema = schema.encode("ascii")
|
|
views = connection.execute(VIEW_SQL, schema_name=schema)
|
|
|
|
return [v["name"] for v in views]
|
|
|
|
def has_table(self, connection, table_name, schema=None):
|
|
try:
|
|
self.get_table_id(connection, table_name, schema)
|
|
except exc.NoSuchTableError:
|
|
return False
|
|
else:
|
|
return True
|