2008/9/29, Rodrigo Monteiro <[EMAIL PROTECTED]>: > Boa tarde a todos. > > Vou fazer a migração do banco do meu sistema para 8.3 esta semana. Agora me > paira uma dúvida levantada por um colega, antigos programadores do meu > sistema prepararam alguns selects desta forma > select * from movimento where cupom = 123456, sendo que o campo cupom é > string, no 8.2 funciona normalmente mas me disseram que no 8.3 não vai > funcionar é verdade? >
Do manual: http://www.postgresql.org/docs/current/interactive/release-8-3.html "E.5.2.1. General * Non-character data types are no longer automatically cast to TEXT (Peter, Tom) Previously, if a non-character value was supplied to an operator or function that requires text input, it was automatically cast to text, for most (though not all) built-in data types. This no longer happens: an explicit cast to text is now required for all non-character-string types. For example, these expressions formerly worked: substr(current_date, 1, 4) 23 LIKE '2%' but will now draw "function does not exist" and "operator does not exist" errors respectively. Use an explicit cast instead: substr(current_date::text, 1, 4) 23::text LIKE '2%' (Of course, you can use the more verbose CAST() syntax too.) The reason for the change is that these automatic casts too often caused surprising behavior. An example is that in previous releases, this expression was accepted but did not do what was expected: current_date < 2017-11-17 This is actually comparing a date to an integer, which should be (and now is) rejected — but in the presence of automatic casts both sides were cast to text and a textual comparison was done, because the text < text operator was able to match the expression when no other < operator could. Types char(n) and varchar(n) still cast to text automatically. Also, automatic casting to text still works for inputs to the concatenation (||) operator, so long as least one input is a character-string type." Osvaldo _______________________________________________ pgbr-geral mailing list [email protected] https://listas.postgresql.org.br/cgi-bin/mailman/listinfo/pgbr-geral
