412 lines
15 KiB
Python
412 lines
15 KiB
Python
from collections import namedtuple
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import cx_Oracle
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from django.db import models
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from django.db.backends.base.introspection import BaseDatabaseIntrospection
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from django.db.backends.base.introspection import FieldInfo as BaseFieldInfo
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from django.db.backends.base.introspection import TableInfo as BaseTableInfo
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from django.utils.functional import cached_property
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FieldInfo = namedtuple(
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"FieldInfo", BaseFieldInfo._fields + ("is_autofield", "is_json", "comment")
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)
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TableInfo = namedtuple("TableInfo", BaseTableInfo._fields + ("comment",))
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class DatabaseIntrospection(BaseDatabaseIntrospection):
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cache_bust_counter = 1
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# Maps type objects to Django Field types.
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@cached_property
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def data_types_reverse(self):
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if self.connection.cx_oracle_version < (8,):
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return {
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cx_Oracle.BLOB: "BinaryField",
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cx_Oracle.CLOB: "TextField",
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cx_Oracle.DATETIME: "DateField",
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cx_Oracle.FIXED_CHAR: "CharField",
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cx_Oracle.FIXED_NCHAR: "CharField",
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cx_Oracle.INTERVAL: "DurationField",
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cx_Oracle.NATIVE_FLOAT: "FloatField",
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cx_Oracle.NCHAR: "CharField",
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cx_Oracle.NCLOB: "TextField",
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cx_Oracle.NUMBER: "DecimalField",
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cx_Oracle.STRING: "CharField",
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cx_Oracle.TIMESTAMP: "DateTimeField",
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}
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else:
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return {
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cx_Oracle.DB_TYPE_DATE: "DateField",
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cx_Oracle.DB_TYPE_BINARY_DOUBLE: "FloatField",
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cx_Oracle.DB_TYPE_BLOB: "BinaryField",
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cx_Oracle.DB_TYPE_CHAR: "CharField",
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cx_Oracle.DB_TYPE_CLOB: "TextField",
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cx_Oracle.DB_TYPE_INTERVAL_DS: "DurationField",
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cx_Oracle.DB_TYPE_NCHAR: "CharField",
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cx_Oracle.DB_TYPE_NCLOB: "TextField",
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cx_Oracle.DB_TYPE_NVARCHAR: "CharField",
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cx_Oracle.DB_TYPE_NUMBER: "DecimalField",
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cx_Oracle.DB_TYPE_TIMESTAMP: "DateTimeField",
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cx_Oracle.DB_TYPE_VARCHAR: "CharField",
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}
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def get_field_type(self, data_type, description):
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if data_type == cx_Oracle.NUMBER:
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precision, scale = description[4:6]
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if scale == 0:
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if precision > 11:
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return (
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"BigAutoField"
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if description.is_autofield
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else "BigIntegerField"
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)
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elif 1 < precision < 6 and description.is_autofield:
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return "SmallAutoField"
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elif precision == 1:
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return "BooleanField"
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elif description.is_autofield:
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return "AutoField"
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else:
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return "IntegerField"
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elif scale == -127:
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return "FloatField"
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elif data_type == cx_Oracle.NCLOB and description.is_json:
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return "JSONField"
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return super().get_field_type(data_type, description)
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def get_table_list(self, cursor):
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"""Return a list of table and view names in the current database."""
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cursor.execute(
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"""
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SELECT
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user_tables.table_name,
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't',
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user_tab_comments.comments
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FROM user_tables
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LEFT OUTER JOIN
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user_tab_comments
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ON user_tab_comments.table_name = user_tables.table_name
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WHERE
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NOT EXISTS (
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SELECT 1
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FROM user_mviews
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WHERE user_mviews.mview_name = user_tables.table_name
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)
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UNION ALL
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SELECT view_name, 'v', NULL FROM user_views
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UNION ALL
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SELECT mview_name, 'v', NULL FROM user_mviews
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"""
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)
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return [
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TableInfo(self.identifier_converter(row[0]), row[1], row[2])
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for row in cursor.fetchall()
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]
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def get_table_description(self, cursor, table_name):
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"""
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Return a description of the table with the DB-API cursor.description
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interface.
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"""
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# user_tab_columns gives data default for columns
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cursor.execute(
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"""
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SELECT
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user_tab_cols.column_name,
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user_tab_cols.data_default,
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CASE
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WHEN user_tab_cols.collation = user_tables.default_collation
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THEN NULL
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ELSE user_tab_cols.collation
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END collation,
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CASE
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WHEN user_tab_cols.char_used IS NULL
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THEN user_tab_cols.data_length
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ELSE user_tab_cols.char_length
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END as display_size,
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CASE
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WHEN user_tab_cols.identity_column = 'YES' THEN 1
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ELSE 0
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END as is_autofield,
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CASE
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WHEN EXISTS (
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SELECT 1
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FROM user_json_columns
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WHERE
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user_json_columns.table_name = user_tab_cols.table_name AND
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user_json_columns.column_name = user_tab_cols.column_name
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)
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THEN 1
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ELSE 0
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END as is_json,
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user_col_comments.comments as col_comment
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FROM user_tab_cols
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LEFT OUTER JOIN
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user_tables ON user_tables.table_name = user_tab_cols.table_name
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LEFT OUTER JOIN
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user_col_comments ON
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user_col_comments.column_name = user_tab_cols.column_name AND
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user_col_comments.table_name = user_tab_cols.table_name
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WHERE user_tab_cols.table_name = UPPER(%s)
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""",
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[table_name],
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)
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field_map = {
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column: (
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display_size,
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default if default != "NULL" else None,
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collation,
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is_autofield,
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is_json,
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comment,
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)
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for (
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column,
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default,
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collation,
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display_size,
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is_autofield,
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is_json,
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comment,
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) in cursor.fetchall()
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}
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self.cache_bust_counter += 1
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cursor.execute(
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"SELECT * FROM {} WHERE ROWNUM < 2 AND {} > 0".format(
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self.connection.ops.quote_name(table_name), self.cache_bust_counter
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)
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)
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description = []
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for desc in cursor.description:
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name = desc[0]
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(
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display_size,
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default,
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collation,
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is_autofield,
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is_json,
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comment,
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) = field_map[name]
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name %= {} # cx_Oracle, for some reason, doubles percent signs.
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description.append(
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FieldInfo(
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self.identifier_converter(name),
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desc[1],
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display_size,
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desc[3],
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desc[4] or 0,
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desc[5] or 0,
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*desc[6:],
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default,
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collation,
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is_autofield,
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is_json,
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comment,
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)
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)
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return description
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def identifier_converter(self, name):
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"""Identifier comparison is case insensitive under Oracle."""
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return name.lower()
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def get_sequences(self, cursor, table_name, table_fields=()):
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cursor.execute(
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"""
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SELECT
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user_tab_identity_cols.sequence_name,
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user_tab_identity_cols.column_name
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FROM
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user_tab_identity_cols,
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user_constraints,
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user_cons_columns cols
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WHERE
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user_constraints.constraint_name = cols.constraint_name
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AND user_constraints.table_name = user_tab_identity_cols.table_name
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AND cols.column_name = user_tab_identity_cols.column_name
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AND user_constraints.constraint_type = 'P'
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AND user_tab_identity_cols.table_name = UPPER(%s)
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""",
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[table_name],
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)
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# Oracle allows only one identity column per table.
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row = cursor.fetchone()
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if row:
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return [
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{
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"name": self.identifier_converter(row[0]),
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"table": self.identifier_converter(table_name),
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"column": self.identifier_converter(row[1]),
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}
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]
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# To keep backward compatibility for AutoFields that aren't Oracle
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# identity columns.
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for f in table_fields:
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if isinstance(f, models.AutoField):
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return [{"table": table_name, "column": f.column}]
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return []
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def get_relations(self, cursor, table_name):
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"""
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Return a dictionary of {field_name: (field_name_other_table, other_table)}
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representing all foreign keys in the given table.
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"""
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table_name = table_name.upper()
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cursor.execute(
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"""
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SELECT ca.column_name, cb.table_name, cb.column_name
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FROM user_constraints, USER_CONS_COLUMNS ca, USER_CONS_COLUMNS cb
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WHERE user_constraints.table_name = %s AND
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user_constraints.constraint_name = ca.constraint_name AND
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user_constraints.r_constraint_name = cb.constraint_name AND
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ca.position = cb.position""",
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[table_name],
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)
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return {
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self.identifier_converter(field_name): (
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self.identifier_converter(rel_field_name),
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self.identifier_converter(rel_table_name),
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)
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for field_name, rel_table_name, rel_field_name in cursor.fetchall()
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}
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def get_primary_key_columns(self, cursor, table_name):
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cursor.execute(
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"""
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SELECT
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cols.column_name
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FROM
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user_constraints,
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user_cons_columns cols
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WHERE
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user_constraints.constraint_name = cols.constraint_name AND
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user_constraints.constraint_type = 'P' AND
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user_constraints.table_name = UPPER(%s)
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ORDER BY
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cols.position
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""",
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[table_name],
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)
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return [self.identifier_converter(row[0]) for row in cursor.fetchall()]
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def get_constraints(self, cursor, table_name):
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"""
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Retrieve any constraints or keys (unique, pk, fk, check, index) across
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one or more columns.
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"""
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constraints = {}
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# Loop over the constraints, getting PKs, uniques, and checks
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cursor.execute(
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"""
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SELECT
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user_constraints.constraint_name,
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LISTAGG(LOWER(cols.column_name), ',')
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WITHIN GROUP (ORDER BY cols.position),
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CASE user_constraints.constraint_type
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WHEN 'P' THEN 1
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ELSE 0
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END AS is_primary_key,
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CASE
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WHEN user_constraints.constraint_type IN ('P', 'U') THEN 1
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ELSE 0
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END AS is_unique,
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CASE user_constraints.constraint_type
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WHEN 'C' THEN 1
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ELSE 0
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END AS is_check_constraint
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FROM
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user_constraints
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LEFT OUTER JOIN
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user_cons_columns cols
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ON user_constraints.constraint_name = cols.constraint_name
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WHERE
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user_constraints.constraint_type = ANY('P', 'U', 'C')
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AND user_constraints.table_name = UPPER(%s)
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GROUP BY user_constraints.constraint_name, user_constraints.constraint_type
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""",
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[table_name],
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)
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for constraint, columns, pk, unique, check in cursor.fetchall():
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constraint = self.identifier_converter(constraint)
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constraints[constraint] = {
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"columns": columns.split(","),
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"primary_key": pk,
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"unique": unique,
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"foreign_key": None,
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"check": check,
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"index": unique, # All uniques come with an index
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}
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# Foreign key constraints
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cursor.execute(
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"""
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SELECT
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cons.constraint_name,
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LISTAGG(LOWER(cols.column_name), ',')
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WITHIN GROUP (ORDER BY cols.position),
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LOWER(rcols.table_name),
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LOWER(rcols.column_name)
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FROM
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user_constraints cons
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INNER JOIN
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user_cons_columns rcols
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ON rcols.constraint_name = cons.r_constraint_name AND rcols.position = 1
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LEFT OUTER JOIN
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user_cons_columns cols
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ON cons.constraint_name = cols.constraint_name
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WHERE
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cons.constraint_type = 'R' AND
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cons.table_name = UPPER(%s)
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GROUP BY cons.constraint_name, rcols.table_name, rcols.column_name
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""",
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[table_name],
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)
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for constraint, columns, other_table, other_column in cursor.fetchall():
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constraint = self.identifier_converter(constraint)
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constraints[constraint] = {
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"primary_key": False,
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"unique": False,
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"foreign_key": (other_table, other_column),
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"check": False,
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"index": False,
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"columns": columns.split(","),
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}
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# Now get indexes
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cursor.execute(
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"""
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SELECT
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ind.index_name,
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LOWER(ind.index_type),
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LOWER(ind.uniqueness),
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LISTAGG(LOWER(cols.column_name), ',')
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WITHIN GROUP (ORDER BY cols.column_position),
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LISTAGG(cols.descend, ',') WITHIN GROUP (ORDER BY cols.column_position)
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FROM
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user_ind_columns cols, user_indexes ind
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WHERE
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cols.table_name = UPPER(%s) AND
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NOT EXISTS (
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SELECT 1
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FROM user_constraints cons
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WHERE ind.index_name = cons.index_name
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) AND cols.index_name = ind.index_name
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GROUP BY ind.index_name, ind.index_type, ind.uniqueness
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""",
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[table_name],
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)
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for constraint, type_, unique, columns, orders in cursor.fetchall():
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constraint = self.identifier_converter(constraint)
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constraints[constraint] = {
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"primary_key": False,
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"unique": unique == "unique",
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"foreign_key": None,
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"check": False,
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"index": True,
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"type": "idx" if type_ == "normal" else type_,
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"columns": columns.split(","),
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"orders": orders.split(","),
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}
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return constraints
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