Re: Out Parameter Support

On 6-Jan-06, at 9:55 AM, Kyle R Morse/Eden wrote:

>
> Thanks for your reply.
> It is 'sort of' supported. I guess I need to be more specific.
> Here is an example of one of the stored functions:
>
> CREATE OR REPLACE FUNCTION EDEN_ITPP.INSERT_COMPANY(INCOMPANY_NAME
> IN VARCHAR,
> INPARENT_COMPANY_ID IN
> INTEGER,
> INPHONE IN VARCHAR,
> INFAX IN VARCHAR,
> NEWID OUT INTEGER) AS $$
> DECLARE
> TEMPNEWID INTEGER;
> BEGIN
> SELECT MAX(ID) INTO TEMPNEWID FROM COMPANY;
> TEMPNEWID := TEMPNEWID + 1;
> IF TEMPNEWID IS NULL THEN
> TEMPNEWID := 1;
> END IF;
> INSERT INTO COMPANY
> (ID,COMPANY_NAME,PARENT_COMPANY_ID,PHONE,FAX,ENABLED)
> VALUES
> (TEMPNEWID,INCOMPANY_NAME,INPARENT_COMPANY_ID,INPHONE,INFAX,1);
> NEWID := TEMPNEWID;
> END;
> $$ LANGUAGE plpgsql;
>
> This function basically inserts a new company in the company table
> and returns the new company's id in the out parameter.
> This is the definition for the company table it is inserting on:
>
> CREATE TABLE EDEN_ITPP.COMPANY (
> ID INTEGER NOT NULL,
> COMPANY_NAME VARCHAR(55) NOT NULL,
> PARENT_COMPANY_ID INTEGER,
> PHONE VARCHAR(30),
> FAX VARCHAR(30),
> ENABLED SMALLINT DEFAULT 1 NOT NULL );
>
> -- DDL Statements for primary key on Table COMPANY
> CREATE UNIQUE INDEX company_pkey ON EDEN_ITPP.COMPANY(ID);
>
>
> This works fine from JDBC if I do this:
>
> PreparedStatement p = conn.prepareCall("? = call
> EDEN_ITPP.INSERT_COMPANY(?, ?, ?, ?)");
> p.registerOutParameter(1, Types.INTEGER);
> p.setString(2, "NewCompany");
> p.setInt(3, 0);
> p.setString(4, "555-555-5555");
> p.setString(5, "555-555-5556");
> p.execute();
> System.out.println(p.getInt(1));
>
> It returns the new company's ID as expected.
>
> However, the query is not constructed using the posgre syntax, it
> uses the standard JDBC stored procedure syntax, so as to be
> compatible with our other DBs
> (Right now it runs on DB2, SQL Server, Oracle, and MySQL, all of
> which work with this query):

This is not specific to postgres, this is the jdbc spec. I'd have to
look into why it isn't working as expected, however you have worse
problems using max(id) to get a unique number in an mvcc database
such as postgresql or oracle.

Dave
>
> PreparedStatement p = conn.prepareCall("call
> EDEN_ITPP.INSERT_COMPANY(?,?, ?, ?, ?)");
> p.setString(1, "NewCompany");
> p.setInt(2, 0);
> p.setString(3, "555-555-5555");
> p.setString(4, "555-555-5556");
> p.registerOutParameter(5, Types.INTEGER);
> p.execute();
> System.out.println(p.getInt(5));
>
> But Postgre barfs at this.
> The exception thrown is:
> PSQLException: A CallableStatement function was executed and the
> return was of type java.sql.Types=4 however type java.sql.Types=0
> was registered.
>
> I am using Server 8.1.1 and JDBC driver 8.1Build 404.
> Does anyone know if there is any plan to support out parameters for
> stored functions in PostgreSQL in the future?
>
> (See the Note regarding stored procedures and out parameter support)
> http://jdbc.postgresql.org/documentation/81/callproc.html
>
> Thanks for your help,
> Kyle
>
>