How to call stored procedure taking array using odbc:param_query in Erlang

问题

I have a stored procedure in db2

create type intArray as integer array[100]@

create or replace procedure sum(in numList intArray, out total integer) 
begin 
    declare i, n integer;  

    set n = CARDINALITY(numList);

    set i = 1; 
    set total = 100; 

    while (i <= n) do 
    set total = total + numList[i]; 
    set i = i + 1; 
    end while;    
end@

I am trying to call through Erlang odbc:param_query.

odbc:param_query(Ref,  "CALL sum (?, ?)", [{sql_integer,[1]}, {sql_integer,out, [1]}]).

The above is giving me proper return as

{executed,1,[{101}]}

But when I pass multiple values as

 odbc:param_query(Ref,  "CALL sum (?, ?)", [{sql_integer,[1,2,3,4]}, {sql_integer,out, [1]}]).

It is throwing an exception

exception exit: {badarg,odbc,param_query,'Params'} in function odbc:decode/1 (odbc.erl, line 894)

Is there any other way to pass a list (Array) to the stored procedure?

回答1:

It looks like there is no OBDC data type (at least with a corresponding Erlang one) for a list of integer (see erlang obdc documentation). I don't know how the the final query should look like (the syntax for int array) but I think that you can achieve what you want by creating your query as a string:

Query = io_lib:format("CALL sum (~p , ~p)",[int_array_syntax([1,2,3,4]),1])

and then use odbc:sql_query(Ref, Query).

回答2:

I believe you need to have an equal amount of arguments in both lists of arguments, meaning add three 1s in your 2nd list or arguments.

odbc:param_query(Ref,  "CALL sum (?, ?)", [{sql_integer, [1,2,3,4]}, {sql_integer, out, [1,1,1,1]}]).

来源：https://stackoverflow.com/questions/18929391/how-to-call-stored-procedure-taking-array-using-odbcparam-query-in-erlang