Johannes Björk wrote
> Hi, Im hoping someone could help me with this. I am new to any kind of sql
> coding so bare with me.
>
> I have written the below working function which I would like to print to
> .csv file(s)
>
> CREATE FUNCTION retrieve_info(input_method TEXT, input_species TEXT)
> RETURNS SETOF
> retrieve_info_tbl AS $$
> SELECT tblA.id, tblA.method, tblA.species, tblA.location
> FROM tblA
> WHERE method=input_method AND species=input_species
> GROUP BY id, method, species
> ORDER BY location
> $$ LANGUAGE 'sql';
>
> DUMMY DATA
>
> tblA (filled)
>
> create table tblA (id varchar(5) PRIMARY KEY, method text, species
> varchar(10), location
> text);
> insert into tblA values ('1a', 'mtd1', 'sp1', 'locA'),('1b', 'mtd1',
> 'sp2', 'locC'),('1c',
> 'mtd2', 'sp3', 'locB'),('1d', 'mtd1', 'sp1', 'locB'),('1e', 'mtd2', 'sp5',
> 'locA');
> retrieve_info_tbl (empty)
>
> create table retrieve_info_tbl (id varchar(5) PRIMARY KEY, method text,
> ind varchar(10),
> location text);
> Calling function
>
> SELECT * FROM retrieve_info('mtd1','sp1');
> OUTPUT
>
> retrieve_info(mtd1, sp3)
>
> id | method | ind | location
> ----------------------------
> 1a | mtd1 | sp3 | locA
> 1d | mtd1 | sp3 | locB
>
> Since I have not succeeded in this, I tried to work around it creating a
> function which called this function and printed the result to a .csv file.
>
> CREATE FUNCTION print_out(x TEXT, y TEXT) RETURNS void AS $$
> COPY (SELECT * FROM retrieve_info(x,y)) TO 'myfilepath/test.csv'
> WITH CSV HEADER;
> $$ LANGUAGE 'sql';
> Calling nested function.
>
> SELECT * FROM print_out('mtd1','sp1');
> OUTPUT
>
> The above gives this ERROR: column "x" does not exist SQL state: 42703
> Context: SQL function "print_out" statement 1. However, when substituting
> x,y in print_out() with 'mtd1','sp1' the correct output is printed to
> test.csv
>
> I would really appreciate any pointers on either one of the above
> problems.
>
> Many thanks,
>
> Johannes
What PostgreSQL version?
SQL functions only recently could refer to input parameters by name. Before
you had to use $1, $2, etc... To reference them.
David J.
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