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Re: calling a stored function which return set of records

From: Szabó Tamás <szabta(at)hdsnet(dot)hu>
To: pgsql-jdbc(at)postgresql(dot)org
Subject: Re: calling a stored function which return set of records
Date: 2009-07-12 08:13:08
Message-ID: 4A599B14.4090002@hdsnet.hu (view raw or flat)
Thread:
Lists: pgsql-jdbc
Now I modified my java code :
            c.setAutoCommit(false);
            // Procedure call.
            CallableStatement cs = (CallableStatement) c.prepareCall("{ 
call ? = get_recipe_data[(?,?,?,?,?,?,?)] }");
            cs.setInt(1, 1);
            cs.registerOutParameter(2, Types.INTEGER);
            cs.registerOutParameter(3, Types.FLOAT);
            cs.registerOutParameter(4, Types.FLOAT);
            cs.registerOutParameter(5, Types.FLOAT);
            cs.registerOutParameter(6, Types.FLOAT);
            cs.registerOutParameter(7, Types.FLOAT);
            cs.execute();
           
            cs.close();

Now I get an error message that parameter 8 is not specified, which I 
understand beacuse there are 8 placeholders ( "?" ) , but I can't find 
out what should i define for the type of SET OF RECORDS as the functions 
returns this type of data.

However the stored procedure called from postgresql client program works 
well.
> You are creating the CallableStatement wrong.
> c.prepareCall("{ call get_recipe_kcal( ?,?,?,?,?,? ) }")
>
> Read more here:
> http://java.sun.com/javase/6/docs/technotes/guides/jdbc/getstart/callablestatement.html#1003293
>
> I suggest reading the whole thing here:
> http://java.sun.com/javase/6/docs/technotes/guides/jdbc/
>
>
> Szabó Tamás wrote:
>   
>> Hello!
>>
>> I have a stored function in a postgresql databse, and I want to call it 
>> from my java program.
>>
>> The stored function is like this:
>>
>> CREATE OR REPLACE FUNCTION get_recipe_data(recipe_id integer,
>>    OUT recipe_id integer,
>>    OUT kcal real,
>>    OUT kj real,
>>    OUT protein real,
>>    OUT fat real,
>>    OUT carbohydrates real
>> ) RETURNS SETOF record
>>
>>     AS $$
>>
>> BEGIN
>>
>> RETURN QUERY
>> SELECT recipes_ingredients_conn.recipe_id,
>>   sum(recipes_ingredients_conn.amount / ingredients.amount * 
>> ingredients.kcal),
>>   sum(recipes_ingredients_conn.amount / ingredients.amount * 
>> ingredients.kj),
>>   sum(recipes_ingredients_conn.amount / ingredients.amount * 
>> ingredients.protein),
>>   sum(recipes_ingredients_conn.amount / ingredients.amount * 
>> ingredients.fat),
>>   sum(recipes_ingredients_conn.amount / ingredients.amount * 
>> ingredients.carbohydrates)
>>
>> FROM recipes_ingredients_conn, ingredients
>> WHERE (recipes_ingredients_conn.ingredient_id = 
>> ingredients.ingredient_id) AND (recipes_ingredients_conn.recipe_id = 
>> recipe_id)
>> GROUP BY recipes_ingredients_conn.recipe_id;
>> END
>>
>> $$
>>
>>     LANGUAGE plpgsql;
>>
>>
>> The code sheet from my java program is like:
>>
>> ...
>> // Turn transactions off.
>>             c.setAutoCommit(false);
>>             // Procedure call, i don't know if this is the right way to 
>> define the stored function
>>            // Maybe do i use a refcursor or something like this???
>>             CallableStatement upperProc = c.prepareCall("{ (?,?,?,?,?,?) 
>> = call get_recipe_kcal( ? ) }");
>>            
>>             upperProc.registerOutParameter(1, Types.INTEGER);
>>             upperProc.registerOutParameter(2, Types.REAL);
>>             upperProc.registerOutParameter(3, Types.REAL);
>>             upperProc.registerOutParameter(4, Types.REAL);
>>             upperProc.registerOutParameter(5, Types.REAL);
>>             upperProc.registerOutParameter(6, Types.REAL);
>>
>>             upperProc.setInt(7, 1);
>>            
>>             upperProc.execute();
>>             double i = upperProc.getDouble(3);
>>            
>>             System.out.println(i);
>>             upperProc.close();
>> ...
>>
>> When I try to run the java program I get the following error message: 
>> Error: Malformed function or procedure escape syntax at offset 2.
>> I don't really know what I'm doing wrong, i read through some articles 
>> about the problem, but I couldn't find a solution.
>> Please help me If you can. Thnaks!
>>
>>
>> -- 
>> Sent via pgsql-jdbc mailing list (pgsql-jdbc(at)postgresql(dot)org)
>> To make changes to your subscription:
>> http://www.postgresql.org/mailpref/pgsql-jdbc
>>
>>
>>     
>
>   


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