Question

Im trying to write sample stored functions in postgresql and call them using the CallableStatement offered by JDBC.

Here’s some my test code

Consumer bean =new Consumer();
CallableStatement pstmt = null;
try {
con.setAutoCommit(false);
String  query = "{ ? = call getData( ? ) }";
pstmt = con.prepareCall(query); 
 pstmt.registerOutParameter(1, Types.OTHER);
      pstmt.setInt(2,5);
      pstmt.execute(); // execute update statement
      bean=(Consumer)pstmt.getObject(1);
       System.out.println("bean"+bean.getConsumer_name());

And my Stored function is of the form .

CREATE FUNCTION getData(int) RETURNS SETOF db_consumer AS $$
 SELECT * FROM db_consumer WHERE consumer_id = $1;
$$ LANGUAGE SQL;

However, I’m getting the following error when I try to run the code .

org.postgresql.util.PSQLException: A CallableStatement was executed with an invalid    number of  parameters .

Any idea why this could be happening?

Answer 1

I don’t think you need a CallableStatement as you should be able to run select * from getData(5) directly:

PreparedStatement pstmt = con.prepareStatement("select * from getData(?)")
pstmt.setInt(1,5);
ResultSet rs = pstmt.execute(); 
while (rs.next()) {
  System.out.println(rs.getString(1));
}