/usr/lib/python3/dist-packages/sqlalchemy/dialects/informix/base.py is in python3-sqlalchemy 0.7.8-1.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 152 153 154 155 156 157 158 159 160 161 162 163 164 165 166 167 168 169 170 171 172 173 174 175 176 177 178 179 180 181 182 183 184 185 186 187 188 189 190 191 192 193 194 195 196 197 198 199 200 201 202 203 204 205 206 207 208 209 210 211 212 213 214 215 216 217 218 219 220 221 222 223 224 225 226 227 228 229 230 231 232 233 234 235 236 237 238 239 240 241 242 243 244 245 246 247 248 249 250 251 252 253 254 255 256 257 258 259 260 261 262 263 264 265 266 267 268 269 270 271 272 273 274 275 276 277 278 279 280 281 282 283 284 285 286 287 288 289 290 291 292 293 294 295 296 297 298 299 300 301 302 303 304 305 306 307 308 309 310 311 312 313 314 315 316 317 318 319 320 321 322 323 324 325 326 327 328 329 330 331 332 333 334 335 336 337 338 339 340 341 342 343 344 345 346 347 348 349 350 351 352 353 354 355 356 357 358 359 360 361 362 363 364 365 366 367 368 369 370 371 372 373 374 375 376 377 378 379 380 381 382 383 384 385 386 387 388 389 390 391 392 393 394 395 396 397 398 399 400 401 402 403 404 405 406 407 408 409 410 411 412 413 414 415 416 417 418 419 420 421 422 423 424 425 426 427 428 429 430 431 432 433 434 435 436 437 438 439 440 441 442 443 444 445 446 447 448 449 450 451 452 453 454 455 456 457 458 459 460 461 462 463 464 465 466 467 468 469 470 471 472 473 474 475 476 477 478 479 480 481 482 483 484 485 486 487 488 489 490 491 492 493 494 495 496 497 498 499 500 501 502 503 504 505 506 507 508 509 510 511 512 513 514 515 516 517 518 519 520 521 522 523 524 525 526 527 528 529 530 531 532 533 534 535 536 537 538 539 540 541 542 543 544 545 546 547 548 549 550 551 552 553 554 555 556 557 558 559 560 561 562 563 564 565 566 567 568 569 570 571 572 573 574 575 576 577 578 579 580 581 582 583 584 585 586 587 588 589 590 591 592 593 594 595 596 597 | # informix/base.py
# Copyright (C) 2005-2012 the SQLAlchemy authors and contributors <see AUTHORS file>
# coding: gbk
#
# This module is part of SQLAlchemy and is released under
# the MIT License: http://www.opensource.org/licenses/mit-license.php
"""Support for the Informix database.
.. note::
The Informix dialect functions on current SQLAlchemy versions
but is not regularly tested, and may have many issues and
caveats not currently handled.
"""
import datetime
from sqlalchemy import sql, schema, exc, pool, util
from sqlalchemy.sql import compiler, text
from sqlalchemy.engine import default, reflection
from sqlalchemy import types as sqltypes
from functools import reduce
RESERVED_WORDS = set(
["abs", "absolute", "access", "access_method", "acos", "active", "add",
"address", "add_months", "admin", "after", "aggregate", "alignment",
"all", "allocate", "all_rows", "alter", "and", "ansi", "any", "append",
"array", "as", "asc", "ascii", "asin", "at", "atan", "atan2", "attach",
"attributes", "audit", "authentication", "authid", "authorization",
"authorized", "auto", "autofree", "auto_reprepare", "auto_stat_mode",
"avg", "avoid_execute", "avoid_fact", "avoid_full", "avoid_hash",
"avoid_index", "avoid_index_sj", "avoid_multi_index", "avoid_nl",
"avoid_star_join", "avoid_subqf", "based", "before", "begin",
"between", "bigint", "bigserial", "binary", "bitand", "bitandnot",
"bitnot", "bitor", "bitxor", "blob", "blobdir", "boolean", "both",
"bound_impl_pdq", "buffered", "builtin", "by", "byte", "cache", "call",
"cannothash", "cardinality", "cascade", "case", "cast", "ceil", "char",
"character", "character_length", "char_length", "check", "class",
"class_origin", "client", "clob", "clobdir", "close", "cluster",
"clustersize", "cobol", "codeset", "collation", "collection",
"column", "columns", "commit", "committed", "commutator", "component",
"components", "concat", "concurrent", "connect", "connection",
"connection_name", "connect_by_iscycle", "connect_by_isleaf",
"connect_by_rootconst", "constraint", "constraints", "constructor",
"context", "continue", "copy", "cos", "costfunc", "count", "crcols",
"create", "cross", "current", "current_role", "currval", "cursor",
"cycle", "database", "datafiles", "dataskip", "date", "datetime",
"day", "dba", "dbdate", "dbinfo", "dbpassword", "dbsecadm",
"dbservername", "deallocate", "debug", "debugmode", "debug_env", "dec",
"decimal", "declare", "decode", "decrypt_binary", "decrypt_char",
"dec_t", "default", "default_role", "deferred", "deferred_prepare",
"define", "delay", "delete", "deleting", "delimited", "delimiter",
"deluxe", "desc", "describe", "descriptor", "detach", "diagnostics",
"directives", "dirty", "disable", "disabled", "disconnect", "disk",
"distinct", "distributebinary", "distributesreferences",
"distributions", "document", "domain", "donotdistribute", "dormant",
"double", "drop", "dtime_t", "each", "elif", "else", "enabled",
"encryption", "encrypt_aes", "encrypt_tdes", "end", "enum",
"environment", "error", "escape", "exception", "exclusive", "exec",
"execute", "executeanywhere", "exemption", "exists", "exit", "exp",
"explain", "explicit", "express", "expression", "extdirectives",
"extend", "extent", "external", "fact", "false", "far", "fetch",
"file", "filetoblob", "filetoclob", "fillfactor", "filtering", "first",
"first_rows", "fixchar", "fixed", "float", "floor", "flush", "for",
"force", "forced", "force_ddl_exec", "foreach", "foreign", "format",
"format_units", "fortran", "found", "fraction", "fragment",
"fragments", "free", "from", "full", "function", "general", "get",
"gethint", "global", "go", "goto", "grant", "greaterthan",
"greaterthanorequal", "group", "handlesnulls", "hash", "having", "hdr",
"hex", "high", "hint", "hold", "home", "hour", "idslbacreadarray",
"idslbacreadset", "idslbacreadtree", "idslbacrules",
"idslbacwritearray", "idslbacwriteset", "idslbacwritetree",
"idssecuritylabel", "if", "ifx_auto_reprepare", "ifx_batchedread_table",
"ifx_int8_t", "ifx_lo_create_spec_t", "ifx_lo_stat_t", "immediate",
"implicit", "implicit_pdq", "in", "inactive", "increment", "index",
"indexes", "index_all", "index_sj", "indicator", "informix", "init",
"initcap", "inline", "inner", "inout", "insert", "inserting", "instead",
"int", "int8", "integ", "integer", "internal", "internallength",
"interval", "into", "intrvl_t", "is", "iscanonical", "isolation",
"item", "iterator", "java", "join", "keep", "key", "label", "labeleq",
"labelge", "labelglb", "labelgt", "labelle", "labellt", "labellub",
"labeltostring", "language", "last", "last_day", "leading", "left",
"length", "lessthan", "lessthanorequal", "let", "level", "like",
"limit", "list", "listing", "load", "local", "locator", "lock", "locks",
"locopy", "loc_t", "log", "log10", "logn", "long", "loop", "lotofile",
"low", "lower", "lpad", "ltrim", "lvarchar", "matched", "matches",
"max", "maxerrors", "maxlen", "maxvalue", "mdy", "median", "medium",
"memory", "memory_resident", "merge", "message_length", "message_text",
"middle", "min", "minute", "minvalue", "mod", "mode", "moderate",
"modify", "module", "money", "month", "months_between", "mounting",
"multiset", "multi_index", "name", "nchar", "negator", "new", "next",
"nextval", "next_day", "no", "nocache", "nocycle", "nomaxvalue",
"nomigrate", "nominvalue", "none", "non_dim", "non_resident", "noorder",
"normal", "not", "notemplatearg", "notequal", "null", "nullif",
"numeric", "numrows", "numtodsinterval", "numtoyminterval", "nvarchar",
"nvl", "octet_length", "of", "off", "old", "on", "online", "only",
"opaque", "opclass", "open", "optcompind", "optical", "optimization",
"option", "or", "order", "ordered", "out", "outer", "output",
"override", "page", "parallelizable", "parameter", "partition",
"pascal", "passedbyvalue", "password", "pdqpriority", "percaltl_cos",
"pipe", "pli", "pload", "policy", "pow", "power", "precision",
"prepare", "previous", "primary", "prior", "private", "privileges",
"procedure", "properties", "public", "put", "raise", "range", "raw",
"read", "real", "recordend", "references", "referencing", "register",
"rejectfile", "relative", "release", "remainder", "rename",
"reoptimization", "repeatable", "replace", "replication", "reserve",
"resolution", "resource", "restart", "restrict", "resume", "retain",
"retainupdatelocks", "return", "returned_sqlstate", "returning",
"returns", "reuse", "revoke", "right", "robin", "role", "rollback",
"rollforward", "root", "round", "routine", "row", "rowid", "rowids",
"rows", "row_count", "rpad", "rtrim", "rule", "sameas", "samples",
"sampling", "save", "savepoint", "schema", "scroll", "seclabel_by_comp",
"seclabel_by_name", "seclabel_to_char", "second", "secondary",
"section", "secured", "security", "selconst", "select", "selecting",
"selfunc", "selfuncargs", "sequence", "serial", "serial8",
"serializable", "serveruuid", "server_name", "session", "set",
"setsessionauth", "share", "short", "siblings", "signed", "sin",
"sitename", "size", "skall", "skinhibit", "skip", "skshow",
"smallfloat", "smallint", "some", "specific", "sql", "sqlcode",
"sqlcontext", "sqlerror", "sqlstate", "sqlwarning", "sqrt",
"stability", "stack", "standard", "start", "star_join", "statchange",
"statement", "static", "statistics", "statlevel", "status", "stdev",
"step", "stop", "storage", "store", "strategies", "string",
"stringtolabel", "struct", "style", "subclass_origin", "substr",
"substring", "sum", "support", "sync", "synonym", "sysdate",
"sysdbclose", "sysdbopen", "system", "sys_connect_by_path", "table",
"tables", "tan", "task", "temp", "template", "test", "text", "then",
"time", "timeout", "to", "today", "to_char", "to_date",
"to_dsinterval", "to_number", "to_yminterval", "trace", "trailing",
"transaction", "transition", "tree", "trigger", "triggers", "trim",
"true", "trunc", "truncate", "trusted", "type", "typedef", "typeid",
"typename", "typeof", "uid", "uncommitted", "under", "union",
"unique", "units", "unknown", "unload", "unlock", "unsigned",
"update", "updating", "upon", "upper", "usage", "use",
"uselastcommitted", "user", "use_hash", "use_nl", "use_subqf",
"using", "value", "values", "var", "varchar", "variable", "variance",
"variant", "varying", "vercols", "view", "violations", "void",
"volatile", "wait", "warning", "weekday", "when", "whenever", "where",
"while", "with", "without", "work", "write", "writedown", "writeup",
"xadatasource", "xid", "xload", "xunload", "year"
])
class InfoDateTime(sqltypes.DateTime):
def bind_processor(self, dialect):
def process(value):
if value is not None:
if value.microsecond:
value = value.replace(microsecond=0)
return value
return process
class InfoTime(sqltypes.Time):
def bind_processor(self, dialect):
def process(value):
if value is not None:
if value.microsecond:
value = value.replace(microsecond=0)
return value
return process
def result_processor(self, dialect, coltype):
def process(value):
if isinstance(value, datetime.datetime):
return value.time()
else:
return value
return process
colspecs = {
sqltypes.DateTime : InfoDateTime,
sqltypes.TIMESTAMP: InfoDateTime,
sqltypes.Time: InfoTime,
}
ischema_names = {
0 : sqltypes.CHAR, # CHAR
1 : sqltypes.SMALLINT, # SMALLINT
2 : sqltypes.INTEGER, # INT
3 : sqltypes.FLOAT, # Float
3 : sqltypes.Float, # SmallFloat
5 : sqltypes.DECIMAL, # DECIMAL
6 : sqltypes.Integer, # Serial
7 : sqltypes.DATE, # DATE
8 : sqltypes.Numeric, # MONEY
10 : sqltypes.DATETIME, # DATETIME
11 : sqltypes.LargeBinary, # BYTE
12 : sqltypes.TEXT, # TEXT
13 : sqltypes.VARCHAR, # VARCHAR
15 : sqltypes.NCHAR, # NCHAR
16 : sqltypes.NVARCHAR, # NVARCHAR
17 : sqltypes.Integer, # INT8
18 : sqltypes.Integer, # Serial8
43 : sqltypes.String, # LVARCHAR
-1 : sqltypes.BLOB, # BLOB
-1 : sqltypes.CLOB, # CLOB
}
class InfoTypeCompiler(compiler.GenericTypeCompiler):
def visit_DATETIME(self, type_):
return "DATETIME YEAR TO SECOND"
def visit_TIME(self, type_):
return "DATETIME HOUR TO SECOND"
def visit_TIMESTAMP(self, type_):
return "DATETIME YEAR TO SECOND"
def visit_large_binary(self, type_):
return "BYTE"
def visit_boolean(self, type_):
return "SMALLINT"
class InfoSQLCompiler(compiler.SQLCompiler):
def default_from(self):
return " from systables where tabname = 'systables' "
def get_select_precolumns(self, select):
s = ""
if select._offset:
s += "SKIP %s " % select._offset
if select._limit:
s += "FIRST %s " % select._limit
s += select._distinct and "DISTINCT " or ""
return s
def visit_select(self, select, asfrom=False, parens=True, **kw):
text = compiler.SQLCompiler.visit_select(self, select, asfrom, parens, **kw)
if asfrom and parens and self.dialect.server_version_info < (11,):
#assuming that 11 version doesn't need this, not tested
return "table(multiset" + text + ")"
else:
return text
def limit_clause(self, select):
return ""
def visit_function(self, func, **kw):
if func.name.lower() == 'current_date':
return "today"
elif func.name.lower() == 'current_time':
return "CURRENT HOUR TO SECOND"
elif func.name.lower() in ('current_timestamp', 'now'):
return "CURRENT YEAR TO SECOND"
else:
return compiler.SQLCompiler.visit_function(self, func, **kw)
def visit_mod(self, binary, **kw):
return "MOD(%s, %s)" % (self.process(binary.left), self.process(binary.right))
class InfoDDLCompiler(compiler.DDLCompiler):
def visit_add_constraint(self, create):
preparer = self.preparer
return "ALTER TABLE %s ADD CONSTRAINT %s" % (
self.preparer.format_table(create.element.table),
self.process(create.element)
)
def get_column_specification(self, column, **kw):
colspec = self.preparer.format_column(column)
first = None
if column.primary_key and column.autoincrement:
try:
first = [c for c in column.table.primary_key.columns
if (c.autoincrement and
isinstance(c.type, sqltypes.Integer) and
not c.foreign_keys)].pop(0)
except IndexError:
pass
if column is first:
colspec += " SERIAL"
else:
colspec += " " + self.dialect.type_compiler.process(column.type)
default = self.get_column_default_string(column)
if default is not None:
colspec += " DEFAULT " + default
if not column.nullable:
colspec += " NOT NULL"
return colspec
def get_column_default_string(self, column):
if (isinstance(column.server_default, schema.DefaultClause) and
isinstance(column.server_default.arg, str)):
if isinstance(column.type, (sqltypes.Integer, sqltypes.Numeric)):
return self.sql_compiler.process(text(column.server_default.arg))
return super(InfoDDLCompiler, self).get_column_default_string(column)
### Informix wants the constraint name at the end, hence this ist c&p from sql/compiler.py
def visit_primary_key_constraint(self, constraint):
if len(constraint) == 0:
return ''
text = "PRIMARY KEY "
text += "(%s)" % ', '.join(self.preparer.quote(c.name, c.quote)
for c in constraint)
text += self.define_constraint_deferrability(constraint)
if constraint.name is not None:
text += " CONSTRAINT %s" % self.preparer.format_constraint(constraint)
return text
def visit_foreign_key_constraint(self, constraint):
preparer = self.dialect.identifier_preparer
remote_table = list(constraint._elements.values())[0].column.table
text = "FOREIGN KEY (%s) REFERENCES %s (%s)" % (
', '.join(preparer.quote(f.parent.name, f.parent.quote)
for f in list(constraint._elements.values())),
preparer.format_table(remote_table),
', '.join(preparer.quote(f.column.name, f.column.quote)
for f in list(constraint._elements.values()))
)
text += self.define_constraint_cascades(constraint)
text += self.define_constraint_deferrability(constraint)
if constraint.name is not None:
text += " CONSTRAINT %s " % \
preparer.format_constraint(constraint)
return text
def visit_unique_constraint(self, constraint):
text = "UNIQUE (%s)" % (', '.join(self.preparer.quote(c.name, c.quote) for c in constraint))
text += self.define_constraint_deferrability(constraint)
if constraint.name is not None:
text += "CONSTRAINT %s " % self.preparer.format_constraint(constraint)
return text
class InformixIdentifierPreparer(compiler.IdentifierPreparer):
reserved_words = RESERVED_WORDS
class InformixDialect(default.DefaultDialect):
name = 'informix'
max_identifier_length = 128 # adjusts at runtime based on server version
type_compiler = InfoTypeCompiler
statement_compiler = InfoSQLCompiler
ddl_compiler = InfoDDLCompiler
colspecs = colspecs
ischema_names = ischema_names
preparer = InformixIdentifierPreparer
default_paramstyle = 'qmark'
def __init__(self, has_transactions=True, *args, **kwargs):
self.has_transactions = has_transactions
default.DefaultDialect.__init__(self, *args, **kwargs)
def initialize(self, connection):
super(InformixDialect, self).initialize(connection)
# http://www.querix.com/support/knowledge-base/error_number_message/error_200
if self.server_version_info < (9, 2):
self.max_identifier_length = 18
else:
self.max_identifier_length = 128
def do_begin(self, connection):
cu = connection.cursor()
cu.execute('SET LOCK MODE TO WAIT')
if self.has_transactions:
cu.execute('SET ISOLATION TO REPEATABLE READ')
def do_commit(self, connection):
if self.has_transactions:
connection.commit()
def do_rollback(self, connection):
if self.has_transactions:
connection.rollback()
def _get_table_names(self, connection, schema, type, **kw):
schema = schema or self.default_schema_name
s = "select tabname, owner from systables where owner=? and tabtype=?"
return [row[0] for row in connection.execute(s, schema, type)]
@reflection.cache
def get_table_names(self, connection, schema=None, **kw):
return self._get_table_names(connection, schema, 'T', **kw)
@reflection.cache
def get_view_names(self, connection, schema=None, **kw):
return self._get_table_names(connection, schema, 'V', **kw)
@reflection.cache
def get_schema_names(self, connection, **kw):
s = "select owner from systables"
return [row[0] for row in connection.execute(s)]
def has_table(self, connection, table_name, schema=None):
schema = schema or self.default_schema_name
cursor = connection.execute(
"""select tabname from systables where tabname=? and owner=?""",
table_name, schema)
return cursor.first() is not None
@reflection.cache
def get_columns(self, connection, table_name, schema=None, **kw):
schema = schema or self.default_schema_name
c = connection.execute(
"""select colname, coltype, collength, t3.default, t1.colno from
syscolumns as t1 , systables as t2 , OUTER sysdefaults as t3
where t1.tabid = t2.tabid and t2.tabname=? and t2.owner=?
and t3.tabid = t2.tabid and t3.colno = t1.colno
order by t1.colno""", table_name, schema)
primary_cols = self.get_primary_keys(connection, table_name, schema, **kw)
columns = []
rows = c.fetchall()
for name, colattr, collength, default, colno in rows:
name = name.lower()
autoincrement = False
primary_key = False
if name in primary_cols:
primary_key = True
# in 7.31, coltype = 0x000
# ^^-- column type
# ^-- 1 not null, 0 null
not_nullable, coltype = divmod(colattr, 256)
if coltype not in (0, 13) and default:
default = default.split()[-1]
if coltype == 6: # Serial, mark as autoincrement
autoincrement = True
if coltype == 0 or coltype == 13: # char, varchar
coltype = ischema_names[coltype](collength)
if default:
default = "'%s'" % default
elif coltype == 5: # decimal
precision, scale = (collength & 0xFF00) >> 8, collength & 0xFF
if scale == 255:
scale = 0
coltype = sqltypes.Numeric(precision, scale)
else:
try:
coltype = ischema_names[coltype]
except KeyError:
util.warn("Did not recognize type '%s' of column '%s'" %
(coltype, name))
coltype = sqltypes.NULLTYPE
column_info = dict(name=name, type=coltype, nullable=not not_nullable,
default=default, autoincrement=autoincrement,
primary_key=primary_key)
columns.append(column_info)
return columns
@reflection.cache
def get_foreign_keys(self, connection, table_name, schema=None, **kw):
schema_sel = schema or self.default_schema_name
c = connection.execute(
"""select t1.constrname as cons_name,
t4.colname as local_column, t7.tabname as remote_table,
t6.colname as remote_column, t7.owner as remote_owner
from sysconstraints as t1 , systables as t2 ,
sysindexes as t3 , syscolumns as t4 ,
sysreferences as t5 , syscolumns as t6 , systables as t7 ,
sysconstraints as t8 , sysindexes as t9
where t1.tabid = t2.tabid and t2.tabname=? and t2.owner=? and t1.constrtype = 'R'
and t3.tabid = t2.tabid and t3.idxname = t1.idxname
and t4.tabid = t2.tabid and t4.colno in (t3.part1, t3.part2, t3.part3,
t3.part4, t3.part5, t3.part6, t3.part7, t3.part8, t3.part9, t3.part10,
t3.part11, t3.part11, t3.part12, t3.part13, t3.part4, t3.part15, t3.part16)
and t5.constrid = t1.constrid and t8.constrid = t5.primary
and t6.tabid = t5.ptabid and t6.colno in (t9.part1, t9.part2, t9.part3,
t9.part4, t9.part5, t9.part6, t9.part7, t9.part8, t9.part9, t9.part10,
t9.part11, t9.part11, t9.part12, t9.part13, t9.part4, t9.part15, t9.part16) and t9.idxname =
t8.idxname
and t7.tabid = t5.ptabid""", table_name, schema_sel)
def fkey_rec():
return {
'name' : None,
'constrained_columns' : [],
'referred_schema' : None,
'referred_table' : None,
'referred_columns' : []
}
fkeys = util.defaultdict(fkey_rec)
rows = c.fetchall()
for cons_name, local_column, \
remote_table, remote_column, remote_owner in rows:
rec = fkeys[cons_name]
rec['name'] = cons_name
local_cols, remote_cols = \
rec['constrained_columns'], rec['referred_columns']
if not rec['referred_table']:
rec['referred_table'] = remote_table
if schema is not None:
rec['referred_schema'] = remote_owner
if local_column not in local_cols:
local_cols.append(local_column)
if remote_column not in remote_cols:
remote_cols.append(remote_column)
return list(fkeys.values())
@reflection.cache
def get_primary_keys(self, connection, table_name, schema=None, **kw):
schema = schema or self.default_schema_name
# Select the column positions from sysindexes for sysconstraints
data = connection.execute(
"""select t2.*
from systables as t1, sysindexes as t2, sysconstraints as t3
where t1.tabid=t2.tabid and t1.tabname=? and t1.owner=?
and t2.idxname=t3.idxname and t3.constrtype='P'""",
table_name, schema
).fetchall()
colpositions = set()
for row in data:
colpos = set([getattr(row, 'part%d' % x) for x in range(1,16)])
colpositions |= colpos
if not len(colpositions):
return []
# Select the column names using the columnpositions
# TODO: Maybe cache a bit of those col infos (eg select all colnames for one table)
place_holder = ','.join('?'*len(colpositions))
c = connection.execute(
"""select t1.colname
from syscolumns as t1, systables as t2
where t2.tabname=? and t1.tabid = t2.tabid and
t1.colno in (%s)""" % place_holder,
table_name, *colpositions
).fetchall()
return reduce(lambda x,y: list(x)+list(y), c, [])
@reflection.cache
def get_indexes(self, connection, table_name, schema, **kw):
# TODO: schema...
c = connection.execute(
"""select t1.*
from sysindexes as t1 , systables as t2
where t1.tabid = t2.tabid and t2.tabname=?""",
table_name)
indexes = []
for row in c.fetchall():
colnames = [getattr(row, 'part%d' % x) for x in range(1,16)]
colnames = [x for x in colnames if x]
place_holder = ','.join('?'*len(colnames))
c = connection.execute(
"""select t1.colname
from syscolumns as t1, systables as t2
where t2.tabname=? and t1.tabid = t2.tabid and
t1.colno in (%s)""" % place_holder,
table_name, *colnames
).fetchall()
c = reduce(lambda x,y: list(x)+list(y), c, [])
indexes.append({
'name': row.idxname,
'unique': row.idxtype.lower() == 'u',
'column_names': c
})
return indexes
@reflection.cache
def get_view_definition(self, connection, view_name, schema=None, **kw):
schema = schema or self.default_schema_name
c = connection.execute(
"""select t1.viewtext
from sysviews as t1 , systables as t2
where t1.tabid=t2.tabid and t2.tabname=?
and t2.owner=? order by seqno""",
view_name, schema).fetchall()
return ''.join([row[0] for row in c])
def _get_default_schema_name(self, connection):
return connection.execute('select CURRENT_ROLE from systables').scalar()
|