Re: Bug in JDBC.driver CopyManager method when copying json output

I suggest this is a backend problem...

This is done with psql...

select to_json('my name is \"rabbit\"'::text);
           to_json
-----------------------------
 "my name is \\\"rabbit\\\""
(1 row)

test=# COPY (select to_json('my name is \"rabbit\"'::text)) TO STDOUT WITH
NULL AS ''";
test"#
test=# COPY (select to_json('my name is \"rabbit\"'::text)) TO STDOUT WITH
NULL AS '';
"my name is \\\\\\"rabbit\\\\\\""


Dave Cramer

[email protected]
www.postgresintl.com


On Fri, 19 Oct 2018 at 10:12, Stadlmann, Gerson <[email protected]>
wrote:

> Dear JDBC-Devs,
>
> i think i found an escaping bug that causes duplicate escaping with
> backslash when using jdbc drivers CopyManager with JSON results.
>
>
>
> *Sample Query:*
>
> select to_json( 'my name is "rabbit"'::text);
>
>
>
> *Executing this query as Statement*
>
> <java>
>
> Statement statement = connection.createStatement()
>
> ResultSet resultSet = statement.executeQuery("select to_json('my name is
> \"rabbit\"'::text)");
>
> String result=resultSet.next().getString(1);// => "my name is \"rabbit\""
>
> </java>
>
>
>
> *Execution of this query using CopyManager (see result file attachment)*
>
> This Execution does the duplicate escaping for JSON output causing invalid
> json text.
>
> <java>
>
> BaseConnection bc=(BaseConnection)
> connection;
>
> final CopyManager cm=new CopyManager(bc);
>
> File someFile=new File("test.json");
>
> try(FileWriter fw=new FileWriter(someFile)){
>
>                 cm.copyOut("COPY (select to_json('my name is
> \"rabbit\"'::text)) TO STDOUT WITH NULL AS ''", fw);
>
>                 // => my name is *\*\"rabbit*\*\" instead
>
> }
>
> </java>
>
>
>
>
>
> *My Driver:*
>
> <dependency>
>
>            <groupId>org.postgresql</groupId>
>
>            <artifactId>*postgresql*</artifactId>
>
>            <version>42.2.5</version>
>
>        </dependency>
>
>
>
> *My pg Server (Docker):*
>
> 10.4 (Debian 10.4-2.pgdg90+1)
>
>
>
> If that is required behavior I suggest to introduce another format “json”
> in addition to “text” and “csv”.
>
>
>
> Kind regards
>
>
>
> *Gerson Stadlmann*
>
> Manager Software Development International
>
>
>
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