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diff --git a/lib/errorcodes.py b/lib/errorcodes.py
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+"""Error codes for PostgresSQL
+
+This module contains symbolic names for all PostgreSQL error codes.
+"""
+# psycopg2/errorcodes.py - PostgreSQL error codes
+#
+# Copyright (C) 2006 Johan Dahlin  <jdahlin@async.com.br>
+#
+# This program is free software; you can redistribute it and/or modify
+# it under the terms of the GNU General Public License as published by the
+# Free Software Foundation; either version 2, or (at your option) any later
+# version.
+#
+# This program is distributed in the hope that it will be useful, but
+# WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTIBILITY
+# or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
+# for more details.
+#
+# Based on:
+#
+#   http://www.postgresql.org/docs/8.1/static/errcodes-appendix.html
+#
+
+# Error classes
+CLASS_SUCCESSFUL_COMPLETION = '00'
+CLASS_WARNING = '01'
+CLASS_NO_DATA = '02'
+CLASS_SQL_STATEMENT_NOT_YET_COMPLETE = '03'
+CLASS_CONNECTION_EXCEPTION = '08'
+CLASS_TRIGGERED_ACTION_EXCEPTION = '09'
+CLASS_FEATURE_NOT_SUPPORTED = '0A'
+CLASS_INVALID_TRANSACTION_INITIATION = '0B'
+CLASS_LOCATOR_EXCEPTION = '0F'
+CLASS_INVALID_GRANTOR = '0L'
+CLASS_INVALID_ROLE_SPECIFICATION = '0P'
+CLASS_CARDINALITY_VIOLATION = '21'
+CLASS_DATA_EXCEPTION = '22'
+CLASS_INTEGRITY_CONSTRAINT_VIOLATION = '23'
+CLASS_INVALID_CURSOR_STATE = '24'
+CLASS_INVALID_TRANSACTION_STATE = '25'
+CLASS_INVALID_SQL_STATEMENT_NAME = '26'
+CLASS_TRIGGERED_DATA_CHANGE_VIOLATION = '27'
+CLASS_INVALID_AUTHORIZATION_SPECIFICATION = '28'
+CLASS_DEPENDENT_PRIVILEGE_DESCRIPTORS_STILL_EXIST = '2B'
+CLASS_INVALID_TRANSACTION_TERMINATION = '2D'
+CLASS_SQL_ROUTINE_EXCEPTION = '2F'
+CLASS_INVALID_CURSOR_NAME = '34'
+CLASS_EXTERNAL_ROUTINE_EXCEPTION = '38'
+CLASS_EXTERNAL_ROUTINE_INVOCATION_EXCEPTION = '39'
+CLASS_SAVEPOINT_EXCEPTION = '3B'
+CLASS_INVALID_CATALOG_NAME = '3D'
+CLASS_INVALID_SCHEMA_NAME = '3F'
+CLASS_TRANSACTION_ROLLBACK = '40'
+CLASS_SYNTAX_ERROR_OR_ACCESS_RULE_VIOLATION = '42'
+CLASS_WITH_CHECK_OPTION_VIOLATION = '44'
+CLASS_INSUFFICIENT_RESOURCES = '53'
+CLASS_PROGRAM_LIMIT_EXCEEDED = '54'
+CLASS_OBJECT_NOT_IN_PREREQUISITE_STATE = '55'
+CLASS_OPERATOR_INTERVENTION = '57'
+CLASS_SYSTEM_ERROR = '58'
+CLASS_CONFIGURATION_FILE_ERROR = 'F0'
+CLASS_PL/PGSQL_ERROR = 'P0'
+CLASS_INTERNAL_ERROR = 'XX'
+
+# Class 00 - Successful Completion
+SUCCESSFUL_COMPLETION = '00'
+
+# Class 01 - Warning
+WARNING = '01000'
+DYNAMIC_RESULT_SETS_RETURNED = '0100C'
+IMPLICIT_ZERO_BIT_PADDING = '01008'
+NULL_VALUE_ELIMINATED_IN_SET_FUNCTION = '01003'
+PRIVILEGE_NOT_GRANTED = '01007'
+PRIVILEGE_NOT_REVOKED = '01006'
+STRING_DATA_RIGHT_TRUNCATION = '01004'
+DEPRECATED_FEATURE = '01P01'
+
+# Class 02 - No Data (this is also a warning class per the SQL standard)
+NO_DATA = '02000'
+NO_ADDITIONAL_DYNAMIC_RESULT_SETS_RETURNED = '02001'
+
+# Class 03 - SQL Statement Not Yet Complete
+SQL_STATEMENT_NOT_YET_COMPLETE = '03000'
+
+# Class 08 - Connection Exception
+CONNECTION_EXCEPTION = '08000'
+CONNECTION_DOES_NOT_EXIST = '08003'
+CONNECTION_FAILURE = '08006'
+SQLCLIENT_UNABLE_TO_ESTABLISH_SQLCONNECTION = '08001'
+SQLSERVER_REJECTED_ESTABLISHMENT_OF_SQLCONNECTION = '08004'
+TRANSACTION_RESOLUTION_UNKNOWN = '08007'
+PROTOCOL_VIOLATION = '08P01'
+
+# Class 09 - Triggered Action Exception
+TRIGGERED_ACTION_EXCEPTION = '09000'
+
+# Class 0A - Feature Not Supported
+FEATURE_NOT_SUPPORTED = '0A000'
+
+# Class 0B - Invalid Transaction Initiation
+INVALID_TRANSACTION_INITIATION = '0B000'
+
+# Class 0F - Locator Exception
+LOCATOR_EXCEPTION = '0F000'
+INVALID_LOCATOR_SPECIFICATION = '0F001'
+
+# Class 0L - Invalid Grantor
+INVALID_GRANTOR = '0L000'
+INVALID_GRANT_OPERATION = '0LP01'
+
+# Class 0P - Invalid Role Specification
+INVALID_ROLE_SPECIFICATION = '0P000'
+
+# Class 21 - Cardinality Violation
+CARDINALITY_VIOLATION = '21000'
+
+# Class 22 - Data Exception
+DATA_EXCEPTION = '22000'
+ARRAY_SUBSCRIPT_ERROR = '2202E'
+CHARACTER_NOT_IN_REPERTOIRE = '22021'
+DATETIME_FIELD_OVERFLOW = '22008'
+DIVISION_BY_ZERO = '22012'
+ERROR_IN_ASSIGNMENT = '22005'
+ESCAPE_CHARACTER_CONFLICT = '2200B'
+INDICATOR_OVERFLOW = '22022'
+INTERVAL_FIELD_OVERFLOW = '22015'
+INVALID_ARGUMENT_FOR_LOGARITHM = '2201E'
+INVALID_ARGUMENT_FOR_POWER_FUNCTION = '2201F'
+INVALID_ARGUMENT_FOR_WIDTH_BUCKET_FUNCTION = '2201G'
+INVALID_CHARACTER_VALUE_FOR_CAST = '22018'
+INVALID_DATETIME_FORMAT = '22007'
+INVALID_ESCAPE_CHARACTER = '22019'
+INVALID_ESCAPE_OCTET = '2200D'
+INVALID_ESCAPE_SEQUENCE = '22025'
+NONSTANDARD_USE_OF_ESCAPE_CHARACTER = '22P06'
+INVALID_INDICATOR_PARAMETER_VALUE = '22010'
+INVALID_LIMIT_VALUE = '22020'
+INVALID_PARAMETER_VALUE = '22023'
+INVALID_REGULAR_EXPRESSION = '2201B'
+INVALID_TIME_ZONE_DISPLACEMENT_VALUE = '22009'
+INVALID_USE_OF_ESCAPE_CHARACTER = '2200C'
+MOST_SPECIFIC_TYPE_MISMATCH = '2200G'
+NULL_VALUE_NOT_ALLOWED = '22004'
+NULL_VALUE_NO_INDICATOR_PARAMETER = '22002'
+NUMERIC_VALUE_OUT_OF_RANGE = '22003'
+STRING_DATA_LENGTH_MISMATCH = '22026'
+STRING_DATA_RIGHT_TRUNCATION = '22001'
+SUBSTRING_ERROR = '22011'
+TRIM_ERROR = '22027'
+UNTERMINATED_C_STRING = '22024'
+ZERO_LENGTH_CHARACTER_STRING = '2200F'
+FLOATING_POINT_EXCEPTION = '22P01'
+INVALID_TEXT_REPRESENTATION = '22P02'
+INVALID_BINARY_REPRESENTATION = '22P03'
+BAD_COPY_FILE_FORMAT = '22P04'
+UNTRANSLATABLE_CHARACTER = '22P05'
+
+# Class 23 - Integrity Constraint Violation
+INTEGRITY_CONSTRAINT_VIOLATION = '23000'
+RESTRICT_VIOLATION = '23001'
+NOT_NULL_VIOLATION = '23502'
+FOREIGN_KEY_VIOLATION = '23503'
+UNIQUE_VIOLATION = '23505'
+CHECK_VIOLATION = '23514'
+
+# Class 24 - Invalid Cursor State
+INVALID_CURSOR_STATE = '24000'
+
+# Class 25 - Invalid Transaction State
+INVALID_TRANSACTION_STATE = '25000'
+ACTIVE_SQL_TRANSACTION = '25001'
+BRANCH_TRANSACTION_ALREADY_ACTIVE = '25002'
+HELD_CURSOR_REQUIRES_SAME_ISOLATION_LEVEL = '25008'
+INAPPROPRIATE_ACCESS_MODE_FOR_BRANCH_TRANSACTION = '25003'
+INAPPROPRIATE_ISOLATION_LEVEL_FOR_BRANCH_TRANSACTION = '25004'
+NO_ACTIVE_SQL_TRANSACTION_FOR_BRANCH_TRANSACTION = '25005'
+READ_ONLY_SQL_TRANSACTION = '25006'
+SCHEMA_AND_DATA_STATEMENT_MIXING_NOT_SUPPORTED = '25007'
+NO_ACTIVE_SQL_TRANSACTION = '25P01'
+IN_FAILED_SQL_TRANSACTION = '25P02'
+
+# Class 26 - Invalid SQL Statement Name
+INVALID_SQL_STATEMENT_NAME = '26000'
+
+# Class 27 - Triggered Data Change Violation
+TRIGGERED_DATA_CHANGE_VIOLATION = '27000'
+
+# Class 28 - Invalid Authorization Specification
+INVALID_AUTHORIZATION_SPECIFICATION = '28000'
+
+# Class 2B - Dependent Privilege Descriptors Still Exist
+DEPENDENT_PRIVILEGE_DESCRIPTORS_STILL_EXIST = '2B000'
+DEPENDENT_OBJECTS_STILL_EXIST = '2BP01'
+
+# Class 2D - Invalid Transaction Termination
+INVALID_TRANSACTION_TERMINATION = '2D000'
+
+# Class 2F - SQL Routine Exception
+SQL_ROUTINE_EXCEPTION = '2F000'
+FUNCTION_EXECUTED_NO_RETURN_STATEMENT = '2F005'
+MODIFYING_SQL_DATA_NOT_PERMITTED = '2F002'
+PROHIBITED_SQL_STATEMENT_ATTEMPTED = '2F003'
+READING_SQL_DATA_NOT_PERMITTED = '2F004'
+
+# Class 34 - Invalid Cursor Name
+INVALID_CURSOR_NAME = '34000'
+
+# Class 38 - External Routine Exception
+EXTERNAL_ROUTINE_EXCEPTION = '38000'
+CONTAINING_SQL_NOT_PERMITTED = '38001'
+MODIFYING_SQL_DATA_NOT_PERMITTED = '38002'
+PROHIBITED_SQL_STATEMENT_ATTEMPTED = '38003'
+READING_SQL_DATA_NOT_PERMITTED = '38004'
+
+# Class 39 - External Routine Invocation Exception
+EXTERNAL_ROUTINE_INVOCATION_EXCEPTION = '39000'
+INVALID_SQLSTATE_RETURNED = '39001'
+NULL_VALUE_NOT_ALLOWED = '39004'
+TRIGGER_PROTOCOL_VIOLATED = '39P01'
+SRF_PROTOCOL_VIOLATED = '39P02'
+
+# Class 3B - Savepoint Exception
+SAVEPOINT_EXCEPTION = '3B000'
+INVALID_SAVEPOINT_SPECIFICATION = '3B001'
+
+# Class 3D - Invalid Catalog Name
+INVALID_CATALOG_NAME = '3D000'
+
+# Class 3F - Invalid Schema Name
+INVALID_SCHEMA_NAME = '3F000'
+
+# Class 40 - Transaction Rollback
+TRANSACTION_ROLLBACK = '40000'
+TRANSACTION_INTEGRITY_CONSTRAINT_VIOLATION = '40002'
+SERIALIZATION_FAILURE = '40001'
+STATEMENT_COMPLETION_UNKNOWN = '40003'
+DEADLOCK_DETECTED = '40P01'
+
+# Class 42 - Syntax Error or Access Rule Violation
+SYNTAX_ERROR_OR_ACCESS_RULE_VIOLATION = '42000'
+SYNTAX_ERROR = '42601'
+INSUFFICIENT_PRIVILEGE = '42501'
+CANNOT_COERCE = '42846'
+GROUPING_ERROR = '42803'
+INVALID_FOREIGN_KEY = '42830'
+INVALID_NAME = '42602'
+NAME_TOO_LONG = '42622'
+RESERVED_NAME = '42939'
+DATATYPE_MISMATCH = '42804'
+INDETERMINATE_DATATYPE = '42P18'
+WRONG_OBJECT_TYPE = '42809'
+UNDEFINED_COLUMN = '42703'
+UNDEFINED_FUNCTION = '42883'
+UNDEFINED_TABLE = '42P01'
+UNDEFINED_PARAMETER = '42P02'
+UNDEFINED_OBJECT = '42704'
+DUPLICATE_COLUMN = '42701'
+DUPLICATE_CURSOR = '42P03'
+DUPLICATE_DATABASE = '42P04'
+DUPLICATE_FUNCTION = '42723'
+DUPLICATE_PREPARED_STATEMENT = '42P05'
+DUPLICATE_SCHEMA = '42P06'
+DUPLICATE_TABLE = '42P07'
+DUPLICATE_ALIAS = '42712'
+DUPLICATE_OBJECT = '42710'
+AMBIGUOUS_COLUMN = '42702'
+AMBIGUOUS_FUNCTION = '42725'
+AMBIGUOUS_PARAMETER = '42P08'
+AMBIGUOUS_ALIAS = '42P09'
+INVALID_COLUMN_REFERENCE = '42P10'
+INVALID_COLUMN_DEFINITION = '42611'
+INVALID_CURSOR_DEFINITION = '42P11'
+INVALID_DATABASE_DEFINITION = '42P12'
+INVALID_FUNCTION_DEFINITION = '42P13'
+INVALID_PREPARED_STATEMENT_DEFINITION = '42P14'
+INVALID_SCHEMA_DEFINITION = '42P15'
+INVALID_TABLE_DEFINITION = '42P16'
+INVALID_OBJECT_DEFINITION = '42P17'
+
+# Class 44 - WITH CHECK OPTION Violation
+WITH_CHECK_OPTION_VIOLATION = '44000'
+
+# Class 53 - Insufficient Resources
+INSUFFICIENT_RESOURCES = '53000'
+DISK_FULL = '53100'
+OUT_OF_MEMORY = '53200'
+TOO_MANY_CONNECTIONS = '53300'
+
+# Class 54 - Program Limit Exceeded
+PROGRAM_LIMIT_EXCEEDED = '54000'
+STATEMENT_TOO_COMPLEX = '54001'
+TOO_MANY_COLUMNS = '54011'
+TOO_MANY_ARGUMENTS = '54023'
+
+# Class 55 - Object Not In Prerequisite State
+OBJECT_NOT_IN_PREREQUISITE_STATE = '55000'
+OBJECT_IN_USE = '55006'
+CANT_CHANGE_RUNTIME_PARAM = '55P02'
+LOCK_NOT_AVAILABLE = '55P03'
+
+# Class 57 - Operator Intervention
+OPERATOR_INTERVENTION = '57000'
+QUERY_CANCELED = '57014'
+ADMIN_SHUTDOWN = '57P01'
+CRASH_SHUTDOWN = '57P02'
+CANNOT_CONNECT_NOW = '57P03'
+
+# Class 58 - System Error (errors external to PostgreSQL itself)
+IO_ERROR = '58030'
+UNDEFINED_FILE = '58P01'
+DUPLICATE_FILE = '58P02'
+
+# Class F0 - Configuration File Error
+CONFIG_FILE_ERROR = 'F0000'
+LOCK_FILE_EXISTS = 'F0001'
+
+# Class P0 - PL/pgSQL Error
+PLPGSQL_ERROR = 'P0000'
+RAISE_EXCEPTION = 'P0001'
+
+# Class XX - Internal Error
+INTERNAL_ERROR = 'XX000'
+DATA_CORRUPTED = 'XX001'
+INDEX_CORRUPTED = 'XX002'