Question

我有一个问题，我有一个查询，有多个表，我想创建一个函数，将该查询作为表返回

SELECT mat.codigo as codmatr, mat.codigoalumno as codal, mat.codigoempresa as codemp ,mat.codigopresentacion as codpre,
    mat.codigosecretaria as codsec, mat.fecha as fechamat, mat.estado as estadomat,
    mat.vigencia as vigmat, p.apellidos as apeAl, p.apellidos||' '||p.nombres as nombrecompleto,
    p.nombres as nomAl,razonsocial ,pre.codigocurso as codcur,cur.nombre as curso
    FROM matricula mat join alumno al on mat.codigoalumno = al.codigoalumno
    join persona p on  al.codigoalumno = p.codigo
    join persona pe on mat.codigoalumno = pe.codigo
    left join empresa emp on mat.codigoempresa = emp.codigo
    join presentacion pre on mat.codigopresentacion = pre.codigo
    join curso cur on cur.codigo = pre.codigocurso
    order by nombrecompleto

那是我的疑问这是我的功能

CREATE OR REPLACE FUNCTION fn_lisMatricula() RETURNS SETOF Matricula AS
$BODY$
DECLARE
    r Matricula%rowtype;
r Persona%rowtype;

BEGIN
    FOR r IN SELECT mat.codigo as codmatr, mat.codigoalumno as codal, mat.codigoempresa as codemp ,mat.codigopresentacion as codpre,
    mat.codigosecretaria as codsec, mat.fecha as fechamat, mat.estado as estadomat,
    mat.vigencia as vigmat, p.apellidos as apeAl, p.apellidos||' '||p.nombres as nombrecompleto,
    p.nombres as nomAl,razonsocial ,pre.codigocurso as codcur,cur.nombre as curso
    FROM matricula mat join alumno al on mat.codigoalumno = al.codigoalumno
    join persona p on  al.codigoalumno = p.codigo
    join persona pe on mat.codigoalumno = pe.codigo
    left join empresa emp on mat.codigoempresa = emp.codigo
    join presentacion pre on mat.codigopresentacion = pre.codigo
    join curso cur on cur.codigo = pre.codigocurso
    order by nombrecompleto
    LOOP       
        RETURN NEXT r;
    END LOOP;
    RETURN;
END
$BODY$
LANGUAGE 'plpgsql';

select * from fn_lisMatricula()

问题是函数的结果只有我的“matricula”表的结构，但我想要所有查询结果的结构。

Answer 1

使用RETURNS TABLE并指定结果列类型和名称。请参阅the PostgreSQL documentation for PL/PgSQL和CREATE FUNCTION。

或者，您可以：

CREATE TYPE用于此目的的自定义复合类型，并返回SETOF it;
使用OUT参数和RETURNS SETOF RECORD，
使用RETURNS SETOF RECORD并在调用函数

RETURNS TABLE(...)是迄今为止最简单的选择。

如何在查询中使用多个表从函数postgresql返回一个表？

1 个答案: