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Postgresql Custom Error Messages

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8.3 / 8.4 / 9.0 PostgreSQL 9.4.9 Documentation Prev Up Next Appendix A. PostgreSQL Error Codes All messages emitted by

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the PostgreSQL server are assigned five-character error codes that follow the SQL raise notice in postgresql function standard's conventions for "SQLSTATE" codes. Applications that need to know which error condition has occurred should usually test the

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error code, rather than looking at the textual error message. The error codes are less likely to change across PostgreSQL releases, and also are not subject to change due to postgresql raise notice multiple variables localization of error messages. Note that some, but not all, of the error codes produced by PostgreSQL are defined by the SQL standard; some additional error codes for conditions not defined by the standard have been invented or borrowed from other databases. According to the standard, the first two characters of an error code denote a class of errors, while the postgresql raise notice not working last three characters indicate a specific condition within that class. Thus, an application that does not recognize the specific error code might still be able to infer what to do from the error class. Table A-1 lists all the error codes defined in PostgreSQL 9.4.9. (Some are not actually used at present, but are defined by the SQL standard.) The error classes are also shown. For each error class there is a "standard" error code having the last three characters 000. This code is used only for error conditions that fall within the class but do not have any more-specific code assigned. The symbol shown in the column "Condition Name" is the condition name to use in PL/pgSQL. Condition names can be written in either upper or lower case. (Note that PL/pgSQL does not recognize warning, as opposed to error, condition names; those are classes 00, 01, and 02.) For some types of errors, the server reports the name of a database object (a table, table column, data type, or constraint) associated with the error; for example, the name of the uniq

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million programmers, just like you, helping each other. Join them; it only takes a minute: Sign up Custom error code class range in PostgreSql? up vote 4 down vote favorite The PostgreSql documentation does not seem https://www.postgresql.org/docs/9.4/static/errcodes-appendix.html to mention a special class range for custom error codes. Has any been defined or is there an unofficial agreement on a specific class range? postgresql customization error-code share|improve this question asked Mar 23 '14 at 17:28 JVerstry 20.6k48164300 1 Very good question, I'll raise it on the mailing list. –Craig Ringer Mar 24 '14 at 1:39 Love this question - I'm currently trying to work with both PostgreSQL and http://stackoverflow.com/questions/22594395/custom-error-code-class-range-in-postgresql Oracle, where Oracle uses and supports returning custom error codes via SQLException#getErrorCode(), while PostgreSQL always return 0 from that method. I've looked pretty hard and found nothing discussing custom errors via SQLException#getSQLState(). –rbellamy Feb 18 at 4:21 add a comment| 1 Answer 1 active oldest votes up vote 4 down vote At the bottom of the first section on this page there is some oblique, and indeed rather unspecific, reference to custom error codes. My approach for custom error codes: Start with a capital letter but not F (predefined config file errors), H (fdw), P (PL/pgSQL) or X (internal). Do not use 0 (zero) or P in the 3rd column. Predefined error codes use these commonly. Use a capital letter in the 4th position. No predefined error codes have this. As an example, start with a character for your app: "T". Then a two-char error class: "3G". Then a sequential code "A0"-"A9", "B0"-"B9", etc. Yields T3GA0, T3GA1, etc. But as Craig Ringer indicated in his comment to the OP, some better guidance on the topic might be useful. Keep in mind though that such guidance would hardly solve the issue, unless a global registry is made of error ranges for common extensions. I am doubtful that such a registry will be made, however. share|improve this answ

here for a quick overview of the site Help Center Detailed answers to any questions you might have Meta Discuss the workings and policies of this site About Us Learn more about Stack Overflow the company Business Learn more about http://stackoverflow.com/questions/14399150/custom-error-message-for-postgresql-check-constrint hiring developers or posting ads with us Stack Overflow Questions Jobs Documentation Tags Users Badges Ask Question x Dismiss Join the Stack Overflow Community Stack Overflow is a community of 6.2 million programmers, just like you, helping each other. http://initd.org/psycopg/docs/errorcodes.html Join them; it only takes a minute: Sign up Custom error message for postgresql check constrint up vote 0 down vote favorite I have the "valid_id" check constraint on my requests table. But when it violates the constraint it raise notice shows following error ERROR: new row for relation "requests" violates check constraint "valid_name" DETAIL: Failing row contains .... But instead of that I want to show message like "Failed to insert record. name is required". Is there any way to show the custom error message in PostgreSQL? postgresql error-handling constraints share|improve this question edited Jun 25 '14 at 21:20 Sam 4,61972455 asked Jan 18 '13 at 12:37 Rohan Patil 1,925721 have you tried to rename the postgres raise notice constraint? –regilero Jan 18 '13 at 12:39 My bad. Its "valid_name" Whenever I try to insert the null in the name field then it gives the error but instead of that I want to show my custom error message –Rohan Patil Jan 18 '13 at 12:42 You could name it Failed_to_insert_record_name_is_required instead of valid_name. –regilero Jan 18 '13 at 12:46 1 check also: dba.stackexchange.com/questions/20693/… –regilero Jan 18 '13 at 12:49 add a comment| 1 Answer 1 active oldest votes up vote 1 down vote This is kind of advanced territory here because you want to be pretty familiar with SQL states as well as existing error messages before you get started. Note that you want to re-used existing sql states as appropriate so that the application doesn't know you have overridden your check constraint. But what you can do is create a function which runs the check and issues a raise exception if the check fails. Something like: CREATE FUNCTION check_is_not_null(value text, column_name text) RETURNS BOOL LANGUAGE plpgsql AS $$ begin IF $1 IS NULL THEN RAISE EXCEPTION 'Error: % is required', $2; END IF; RETURN TRUE; END; $$; If you are using 8.4 or higher, you can specify an SQL state. share|improve this answer answered Apr 21 '13 at 10:06 Chris Travers 12.9k424107 1 Note that you still can't control the whole error message produced by

codes and error classes codes. Subclasses of Error make the PostgreSQL error code available in the pgcode attribute. From PostgreSQL documentation: All messages emitted by the PostgreSQL server are assigned five-character error codes that follow the SQL standard's conventions for SQLSTATE codes. Applications that need to know which error condition has occurred should usually test the error code, rather than looking at the textual error message. The error codes are less likely to change across PostgreSQL releases, and also are not subject to change due to localization of error messages. Note that some, but not all, of the error codes produced by PostgreSQL are defined by the SQL standard; some additional error codes for conditions not defined by the standard have been invented or borrowed from other databases. According to the standard, the first two characters of an error code denote a class of errors, while the last three characters indicate a specific condition within that class. Thus, an application that does not recognize the specific error code can still be able to infer what to do from the error class. See also PostgreSQL Error Codes table An example of the available constants defined in the module: >>> errorcodes.CLASS_SYNTAX_ERROR_OR_ACCESS_RULE_VIOLATION '42' >>> errorcodes.UNDEFINED_TABLE '42P01' Constants representing all the error values defined by PostgreSQL versions between 8.1 and 9.4 are included in the module. psycopg2.errorcodes.lookup(code)ΒΆ Lookup an error code or class code and return its symbolic name. Raise KeyError if the code is not found. >>> try: ... cur.execute("SELECT ouch FROM aargh;") ... except Exception, e: ... pass ... >>> errorcodes.lookup(e.pgcode[:2]) 'CLASS_SYNTAX_ERROR_OR_ACCESS_RULE_VIOLATION' >>> errorcodes.lookup(e.pgcode) 'U

 

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