Re: problem with pgjdbc prepared statements and new jsonb exists operator (?)

Peter,

Can you pull from head, this should work

Dave Cramer

dave.cramer(at)credativ(dot)ca
http://www.credativ.ca

On 19 January 2015 at 15:36, Peter Mortier <peter(dot)mortier(at)gmail(dot)com> wrote:

> Hello,
>
> I'm testing out the new jsonb functionality in Postgresql 9.4 and ran
> across an issue with some of the newly introduced operators for the jsonb
> datatype described here (
> http://www.postgresql.org/docs/9.4/static/functions-json.html#FUNCTIONS-JSONB-OP-TABLE)
> when used with JDBC prepared statements.
>
> I have created the following table:
>
> create table "JsonTest0" ("id" BIGSERIAL NOT NULL PRIMARY KEY,"json" jsonb
> DEFAULT ' {"a":"v1","b":2} ' NOT NULL)
>
> When I'm creating and executing a simple statement using the exist
> operator then I get expected results back:
>
> connection.createStatement.executeQuery("select x2.\"json\" from
> \"JsonTest0\" x2 where (x2.\"json\" ? 'c') = true")
>
> When I try to execute the same query using a prepared statement, I get the
> following:
>
> connection.prepareStatement("select x2.\"json\" from \"JsonTest0\" x2
> where (x2.\"json\" ? 'c') = true").executeQuery()
>
> org.postgresql.util.PSQLException: No value specified for parameter 1.
> at
> org.postgresql.core.v3.SimpleParameterList.checkAllParametersSet(SimpleParameterList.java:216)
> at
> org.postgresql.core.v3.QueryExecutorImpl.execute(QueryExecutorImpl.java:244)
> at
> org.postgresql.jdbc2.AbstractJdbc2Statement.execute(AbstractJdbc2Statement.java:560)
> at
> org.postgresql.jdbc2.AbstractJdbc2Statement.executeWithFlags(AbstractJdbc2Statement.java:417)
> at
> org.postgresql.jdbc2.AbstractJdbc2Statement.executeQuery(AbstractJdbc2Statement.java:302)
>
> So it looks like the ? character, which is used as the jsonb exists
> operator is confusing the prepared statement parser, which treats it as a
> parameter substitution instead.
>
> Is this expected behaviour and am I stuck with non-prepared statements
> when using the new ?, ?& and ?| jsonb operators ?
> Any other workarounds, like escaping or function aliases that you may know
> of ?
>
> I tested with both: 9.3-1100-jdbc41 and 9.4-1200-jdbc41-SNAPSHOT versions
>
> BR,
>
> Peter Mortier
>
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