I am running into a behavior with a postgresql function with a SETOF
refcursor's returning multiple columns. Not sure if there is a different way to
retrieve a SETOF refcursor's with variable columns? Alternatively can I return
a primitive value and a refcursor from the same function. I tried specifying
this as OUT parameters without any luck. In Oracle you can pass this in
functions:
Platform:postgresql-x64-9.0 (PostgreSQL 9.0.1, compiled by Visual C++ build
1500, 64-bit)Java1.6JDBC4 Postgresql Driver, Version 9.0-801
Function:CREATE OR REPLACE FUNCTION test() RETURNS SETOF refcursor
AS$BODY$DECLAREref1 refcursor;ref2 refcursor;BEGIN OPEN ref1 FOR
SELECT 1; RETURN NEXT ref1; OPEN ref2 FOR SELECT 2, 3;
RETURN NEXT ref2; RETURN;END;$BODY$ LANGUAGE plpgsql
Java Code:CallableStatement cs = conn.prepareCall("{ call test() }");ResultSet
rs = cs.executeQuery();
while (rs.next()) { System.out.println(rs.getString(1));ResultSet rs2 =
(ResultSet)rs.getObject(1); while (rs2.next()) {
ResultSetMetaData rsmd = rs2.getMetaData(); int numberOfColumns =
rsmd.getColumnCount();System.out.println("numberOfColumns: " +
numberOfColumns); System.out.println(rs2.getString(1));
System.out.println(rs2.getString(2)); }}
Output:numberOfColumns: 11org.postgresql.util.PSQLException:
The column index is out of range: 2, number of columns: 1.at
org.postgresql.jdbc2.AbstractJdbc2ResultSet.checkColumnIndex(AbstractJdbc2ResultSet.java:2680)
at
org.postgresql.jdbc2.AbstractJdbc2ResultSet.checkResultSet(AbstractJdbc2ResultSet.java:2697)
at
org.postgresql.jdbc2.AbstractJdbc2ResultSet.getString(AbstractJdbc2ResultSet.java:1872)
at PgBlob.test(PgBlob.java:64)at PgBlob.main(PgBlob.java:37)
It appears the second result-set takes in the number of columns from the first
irrespective of the number of columns from the second. If the change the
function to return 2 refcursor's with same number of columns then it works as
expected.
Function:CREATE OR REPLACE FUNCTION test() RETURNS SETOF refcursor
AS$BODY$DECLAREref1 refcursor;ref2 refcursor;BEGIN OPEN ref1 FOR
SELECT 1, null; RETURN NEXT ref1; OPEN ref2 FOR SELECT 2, 3;
RETURN NEXT ref2; RETURN;END;$BODY$ LANGUAGE plpgsql
Output:numberOfColumns: 214numberOfColumns:
223
