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https://gitlab.com/MoonTestUse1/AdministrationItDepartmens.git
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MoonTestUse1
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# dialects/mssql/information_schema.py
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# Copyright (C) 2005-2024 the SQLAlchemy authors and contributors
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# <see AUTHORS file>
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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: https://www.opensource.org/licenses/mit-license.php
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# mypy: ignore-errors
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from ... import cast
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from ... import Column
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from ... import MetaData
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from ... import Table
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from ...ext.compiler import compiles
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from ...sql import expression
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from ...types import Boolean
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from ...types import Integer
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from ...types import Numeric
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from ...types import NVARCHAR
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from ...types import String
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from ...types import TypeDecorator
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from ...types import Unicode
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ischema = MetaData()
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class CoerceUnicode(TypeDecorator):
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impl = Unicode
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cache_ok = True
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def bind_expression(self, bindvalue):
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return _cast_on_2005(bindvalue)
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class _cast_on_2005(expression.ColumnElement):
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def __init__(self, bindvalue):
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self.bindvalue = bindvalue
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@compiles(_cast_on_2005)
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def _compile(element, compiler, **kw):
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from . import base
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if (
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compiler.dialect.server_version_info is None
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or compiler.dialect.server_version_info < base.MS_2005_VERSION
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):
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return compiler.process(element.bindvalue, **kw)
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else:
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return compiler.process(cast(element.bindvalue, Unicode), **kw)
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schemata = Table(
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"SCHEMATA",
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ischema,
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Column("CATALOG_NAME", CoerceUnicode, key="catalog_name"),
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Column("SCHEMA_NAME", CoerceUnicode, key="schema_name"),
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Column("SCHEMA_OWNER", CoerceUnicode, key="schema_owner"),
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schema="INFORMATION_SCHEMA",
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)
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tables = Table(
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"TABLES",
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ischema,
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Column("TABLE_CATALOG", CoerceUnicode, key="table_catalog"),
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Column("TABLE_SCHEMA", CoerceUnicode, key="table_schema"),
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Column("TABLE_NAME", CoerceUnicode, key="table_name"),
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Column("TABLE_TYPE", CoerceUnicode, key="table_type"),
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schema="INFORMATION_SCHEMA",
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)
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columns = Table(
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"COLUMNS",
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ischema,
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Column("TABLE_SCHEMA", CoerceUnicode, key="table_schema"),
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Column("TABLE_NAME", CoerceUnicode, key="table_name"),
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Column("COLUMN_NAME", CoerceUnicode, key="column_name"),
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Column("IS_NULLABLE", Integer, key="is_nullable"),
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Column("DATA_TYPE", String, key="data_type"),
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Column("ORDINAL_POSITION", Integer, key="ordinal_position"),
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Column(
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"CHARACTER_MAXIMUM_LENGTH", Integer, key="character_maximum_length"
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),
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Column("NUMERIC_PRECISION", Integer, key="numeric_precision"),
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Column("NUMERIC_SCALE", Integer, key="numeric_scale"),
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Column("COLUMN_DEFAULT", Integer, key="column_default"),
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Column("COLLATION_NAME", String, key="collation_name"),
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schema="INFORMATION_SCHEMA",
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)
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mssql_temp_table_columns = Table(
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"COLUMNS",
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ischema,
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Column("TABLE_SCHEMA", CoerceUnicode, key="table_schema"),
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Column("TABLE_NAME", CoerceUnicode, key="table_name"),
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Column("COLUMN_NAME", CoerceUnicode, key="column_name"),
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Column("IS_NULLABLE", Integer, key="is_nullable"),
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Column("DATA_TYPE", String, key="data_type"),
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Column("ORDINAL_POSITION", Integer, key="ordinal_position"),
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Column(
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"CHARACTER_MAXIMUM_LENGTH", Integer, key="character_maximum_length"
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),
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Column("NUMERIC_PRECISION", Integer, key="numeric_precision"),
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Column("NUMERIC_SCALE", Integer, key="numeric_scale"),
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Column("COLUMN_DEFAULT", Integer, key="column_default"),
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Column("COLLATION_NAME", String, key="collation_name"),
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schema="tempdb.INFORMATION_SCHEMA",
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)
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constraints = Table(
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"TABLE_CONSTRAINTS",
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ischema,
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Column("TABLE_SCHEMA", CoerceUnicode, key="table_schema"),
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Column("TABLE_NAME", CoerceUnicode, key="table_name"),
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Column("CONSTRAINT_NAME", CoerceUnicode, key="constraint_name"),
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Column("CONSTRAINT_TYPE", CoerceUnicode, key="constraint_type"),
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schema="INFORMATION_SCHEMA",
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)
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column_constraints = Table(
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"CONSTRAINT_COLUMN_USAGE",
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ischema,
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Column("TABLE_SCHEMA", CoerceUnicode, key="table_schema"),
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Column("TABLE_NAME", CoerceUnicode, key="table_name"),
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Column("COLUMN_NAME", CoerceUnicode, key="column_name"),
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Column("CONSTRAINT_NAME", CoerceUnicode, key="constraint_name"),
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schema="INFORMATION_SCHEMA",
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)
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key_constraints = Table(
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"KEY_COLUMN_USAGE",
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ischema,
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Column("TABLE_SCHEMA", CoerceUnicode, key="table_schema"),
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Column("TABLE_NAME", CoerceUnicode, key="table_name"),
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Column("COLUMN_NAME", CoerceUnicode, key="column_name"),
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Column("CONSTRAINT_NAME", CoerceUnicode, key="constraint_name"),
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Column("CONSTRAINT_SCHEMA", CoerceUnicode, key="constraint_schema"),
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Column("ORDINAL_POSITION", Integer, key="ordinal_position"),
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schema="INFORMATION_SCHEMA",
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)
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ref_constraints = Table(
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"REFERENTIAL_CONSTRAINTS",
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ischema,
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Column("CONSTRAINT_CATALOG", CoerceUnicode, key="constraint_catalog"),
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Column("CONSTRAINT_SCHEMA", CoerceUnicode, key="constraint_schema"),
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Column("CONSTRAINT_NAME", CoerceUnicode, key="constraint_name"),
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# TODO: is CATLOG misspelled ?
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Column(
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"UNIQUE_CONSTRAINT_CATLOG",
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CoerceUnicode,
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key="unique_constraint_catalog",
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),
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Column(
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"UNIQUE_CONSTRAINT_SCHEMA",
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CoerceUnicode,
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key="unique_constraint_schema",
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),
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Column(
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"UNIQUE_CONSTRAINT_NAME", CoerceUnicode, key="unique_constraint_name"
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),
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Column("MATCH_OPTION", String, key="match_option"),
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Column("UPDATE_RULE", String, key="update_rule"),
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Column("DELETE_RULE", String, key="delete_rule"),
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schema="INFORMATION_SCHEMA",
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)
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views = Table(
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"VIEWS",
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ischema,
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Column("TABLE_CATALOG", CoerceUnicode, key="table_catalog"),
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Column("TABLE_SCHEMA", CoerceUnicode, key="table_schema"),
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Column("TABLE_NAME", CoerceUnicode, key="table_name"),
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Column("VIEW_DEFINITION", CoerceUnicode, key="view_definition"),
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Column("CHECK_OPTION", String, key="check_option"),
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Column("IS_UPDATABLE", String, key="is_updatable"),
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schema="INFORMATION_SCHEMA",
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)
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computed_columns = Table(
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"computed_columns",
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ischema,
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Column("object_id", Integer),
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Column("name", CoerceUnicode),
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Column("is_computed", Boolean),
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Column("is_persisted", Boolean),
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Column("definition", CoerceUnicode),
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schema="sys",
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)
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sequences = Table(
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"SEQUENCES",
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ischema,
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Column("SEQUENCE_CATALOG", CoerceUnicode, key="sequence_catalog"),
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Column("SEQUENCE_SCHEMA", CoerceUnicode, key="sequence_schema"),
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Column("SEQUENCE_NAME", CoerceUnicode, key="sequence_name"),
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schema="INFORMATION_SCHEMA",
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)
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class NumericSqlVariant(TypeDecorator):
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r"""This type casts sql_variant columns in the identity_columns view
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to numeric. This is required because:
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* pyodbc does not support sql_variant
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* pymssql under python 2 return the byte representation of the number,
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int 1 is returned as "\x01\x00\x00\x00". On python 3 it returns the
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correct value as string.
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"""
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impl = Unicode
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cache_ok = True
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def column_expression(self, colexpr):
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return cast(colexpr, Numeric(38, 0))
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identity_columns = Table(
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"identity_columns",
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ischema,
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Column("object_id", Integer),
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Column("name", CoerceUnicode),
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Column("is_identity", Boolean),
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Column("seed_value", NumericSqlVariant),
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Column("increment_value", NumericSqlVariant),
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Column("last_value", NumericSqlVariant),
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Column("is_not_for_replication", Boolean),
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schema="sys",
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)
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class NVarcharSqlVariant(TypeDecorator):
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"""This type casts sql_variant columns in the extended_properties view
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to nvarchar. This is required because pyodbc does not support sql_variant
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"""
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impl = Unicode
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cache_ok = True
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def column_expression(self, colexpr):
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return cast(colexpr, NVARCHAR)
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extended_properties = Table(
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"extended_properties",
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ischema,
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Column("class", Integer), # TINYINT
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Column("class_desc", CoerceUnicode),
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Column("major_id", Integer),
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Column("minor_id", Integer),
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Column("name", CoerceUnicode),
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Column("value", NVarcharSqlVariant),
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schema="sys",
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)
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