问题
This question already has an answer here:
- Convert escaped Unicode character back to actual character in PostgreSQL 1 answer
I am loading data dump from external source and some strings contain \uXXXX sequences for the UTF8 chars, like this one:
\u017D\u010F\u00E1r nad S\u00E1zavou
I can check the contents by using E'' constant in psql, but cannot find any function/operator to return me proper value.
I'd like to ask, if it's possible to convert this string with unicode escapes into normal UTF8 without using PL/pgSQL functions?
回答1:
I don't think there is a built in method for that. Easiest way I can think of is the plpgsql function you wanted to avoid:
CREATE OR REPLACE FUNCTION str_eval(text, OUT t text) AS
$func$
BEGIN
EXECUTE 'SELECT E''' || replace($1, '''', '''''') || ''''
USING $1
INTO t;
END
$func$ LANGUAGE plpgsql IMMUTABLE STRICT;
The updated version safeguards against SQLi and is faster, too.
来源：https://stackoverflow.com/questions/10111654/how-to-convert-literal-u-sequences-into-utf-8