sql - Error while concatenating plpgsql var with query on cursor statement -


i getting error trying concatenate var sch in second for:

error: syntax error in or next "||" sql state: 42601 character: 1151

does know how solve problem concatenation?

create or replace function generate_mallet_input2() returns void $$  declare  sch name; r record;    begin      sch in       select schema_name information_schema.schemata schema_name not in ('test','summary','public','pg_toast','pg_temp_1','pg_toast_temp_1','pg_catalog','information_schema')      loop           r in select rp.id id,g.classified classif, concat(rp.summary,rp.description,string_agg(c.message, '. ')) mess              sch.report rp             inner join || sch || .report_comment rc on rp.id=rc.report_id             inner join || sch || .comment c on rc.comments_generatedid=c.generatedid              inner join || sch || .gold_set g on rp.id=g.key             g.classified = (values('bug'),('improvement'),('refactoring'))             group g.classified,rp.summary,rp.description,rp.id          loop              if r.classif = 'bug'                 execute 'copy( values('|| r.mess  || ') ) ''/tmp/csv-temp/bug/' || quote_ident(sch) || '-' || r.id || '.txt '' delimiter '' '' ';             elsif r.classif = 'improvement'                 execute 'copy( values('|| r.mess  || ') ) ''/tmp/csv-temp/improvement/' || quote_ident(sch) || '-' || r.id || '.txt '' delimiter '' '' ';             elsif r.classif = 'refactoring'                 execute 'copy( values('|| r.mess  || ') ) ''/tmp/csv-temp/refactoring/' || quote_ident(sch) || '-' || r.id || '.txt '' delimiter '' '' ';             end if;                        end loop;        end loop;      return;   end; $$ language plpgsql strict;

you cannot dynamically change schema embedded sql. database related identifier have constant. if have modern postgresql (probably higher 9.2, works in 9.4), can change search path:

create schema s1; create schema s2; create table s1.t1(a int); create table s2.t1(a int); insert s1.t1 values(10); insert s2.t1 values(20);  $$ declare r record; begin    in 1..2 loop     perform set_config('search_path', 's'||i, true);     r in select * t1 loop        raise notice '%', r;     end loop;   end loop;  end; $$;

if code doesn't work, have use dynamic sql - for in execute statement.


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