数据类型(可以有模式修饰)，可以是基本类型，复合类型、域类型、游标、或者可以引用一个现有表类型、字段类型(建立时转换为对应的类型)、还可以是多态类型 anyelement、anyarray，也可以是各种数据类型的数组形式。

基本类型

teledb=# CREATE OR REPLACE PROCEDURE p_base_para (a_int integer,a_str text) AS
$$
BEGIN  
    RAISE NOTICE 'a_int = % ; a_str = %',a_int,a_str;
END;
$$
LANGUAGE PLPGSQL;
CREATE PROCEDURE
teledb=# 
CALL  p_base_para(1,'teledb_pg');                                  
NOTICE:  a_int = 1 ; a_str = teledb_pg
CALL
teledb=#
teledb=# CREATE OR REPLACE PROCEDURE p_base_array (a_int integer[],a_str text[]) AS
$$
BEGIN  
    RAISE NOTICE 'a_int = % ; a_str = %',a_int,a_str;
END;
$$
LANGUAGE PLPGSQL;
CREATE PROCEDURE
teledb=# CALL p_base_array(ARRAY[1,2,3],ARRAY['teledb_pg','pgxz']);              
NOTICE:  a_int = {1,2,3} ; a_str = {teledb_pg,pgxz}
CALL
teledb=#

复合类型

teledb=# CREATE TYPE public.t_per AS
(  
    id integer,  
    mc text
);
CREATE TYPE
teledb=# CREATE OR REPLACE PROCEDURE p_type (a_row public.t_per) AS                               $$
BEGIN        
RAISE NOTICE 'id = % ; mc = %',a_row.id,a_row.mc;
END;
$$
LANGUAGE PLPGSQL;
CREATE PROCEDURE
teledb=# CALL p_type(ROW(1,'teledb_pg')::public.t_per);
NOTICE:  id = 1 ; mc = teledb_pg
CALL
teledb=#

复合数组

teledb=# CREATE OR REPLACE PROCEDURE p_type_array (a_rec public.t_per[]) AS
$$
BEGIN  
    RAISE NOTICE 'a_rec = %',a_rec;
    RAISE NOTICE 'a_rec[1].id = %',a_rec[1].id;
END;
$$
LANGUAGE PLPGSQL;
CREATE PROCEDURE
teledb=# CALL p_type_array (ARRAY[ROW(1,'teledb_pg'),ROW(1,'pgxz')]::public.t_per[]);
NOTICE:  a_rec = {"(1,teledb_pg)","(1,pgxz)"}
NOTICE:  a_rec[1].id = 1
CALL
teledb=#

行类型

teledb=# create table public.t(id int,mc text);
CREATE TABLE
teledb=#

teledb=# CREATE OR REPLACE PROCEDURE p_row (a_row public.t)  AS
$$
BEGIN
RAISE NOTICE 'id = % ; mc = %',a_row.id,a_row.mc;
END;
$$
LANGUAGE PLPGSQL;
CREATE PROCEDURE
teledb=#CALL p_row(ROW(1,'teledb_pg'));
NOTICE:  id = 1 ; mc = teledb_pg
CALL
teledb=#

行数组

teledb=# CREATE OR REPLACE PROCEDURE p_row_array (a_rec public.t[]) AS
$$
BEGIN
    RAISE NOTICE 'a_rec = %',a_rec;
    RAISE NOTICE 'a_rec[1].id = %',a_rec[1].id;
END;
$$
LANGUAGE PLPGSQL;
CREATE PROCEDURE
teledb=# CALL p_row_array(array[row(1,'teledb_pg'),row(1,'pgxz')]::public.t[]);
NOTICE:  a_rec = {"(1,teledb_pg)","(1,pgxz)"}
NOTICE:  a_rec[1].id = 1
CALL
teledb=#

游标类型

teledb=# CREATE OR REPLACE PROCEDURE p_refcursor (a_ref refcursor) AS
$$
DECLARE    v_rec record;
BEGIN  
    OPEN a_ref FOR SELECT * FROM t LIMIT 1;  
    FETCH a_ref INTO v_rec;  
    RAISE NOTICE 'v_rec = % ',v_rec;
END;
$$
LANGUAGE PLPGSQL;
CREATE PROCEDURE
teledb=# CALL p_refcursor('a');
NOTICE:  v_rec = (1,teledb_pg) 
CALL
teledb=#

teledb=# CREATE OR REPLACE PROCEDURE f_any(a_arg anyelement) AS
$$
BEGIN  
RAISE NOTICE '%',a_arg;
END;
$$
LANGUAGE PLPGSQL;
CREATE PROCEDURE

teledb=# CALL f_any(1);
NOTICE:  1
CALL

teledb=# CALL f_any('teledb_pg'::varchar);
NOTICE:  teledb_pg
CALL
teledb=#

teledb=# CALL f_any('teledb_pg'::TEXT);
NOTICE:  teledb_pg 
f_any
-------

(1 行记录)
teledb=# CALL f_any(ROW(1,'teledb_pg')::public.t);
NOTICE:  (1,teledb_pg)
CALL
teledb=#

teledb=# CALL f_any(ARRAY[1,2]::INTEGER[]);
NOTICE:  {1,2}
CALL
teledb=#

teledb=# CALL  f_any(ARRAY[[1,2],[3,4],[5,6]]::INTEGER[][][]);
NOTICE:  {{1,2},{3,4},{5,6}}
CALL
teledb=#
注意多态类型参数调用时最好直接声明参数类型，否则有可能出错。
teledb=# CREATE OR REPLACE PROCEDURE f_any(a_arg anyarray) AS
$$
BEGIN  
    RAISE NOTICE '%',a_arg;
END;
$$
LANGUAGE PLPGSQL;
CREATE PROCEDURE
teledb=# call f_any(ARRAY['teledb_pg','pgxz']::TEXT[]);
ERROR:  procedure f_any(text[]) is not unique
LINE 1: call f_any(ARRAY['teledb_pg','pgxz']::TEXT[]);
               ^
HINT:  Could not choose a best candidate procedure. You might need to add explicit type casts.
teledb=#teledb=# CREATE OR REPLACE PROCEDURE f_any(a_arg anyarray) AS
$$
BEGIN  
    RAISE NOTICE '%',a_arg;
END;
$$
LANGUAGE PLPGSQL;
CREATE PROCEDURE
teledb=# call f_any(ARRAY['teledb_pg','pgxz']::TEXT[]);
ERROR:  procedure f_any(text[]) is not unique
LINE 1: call f_any(ARRAY['teledb_pg','pgxz']::TEXT[]);
               ^
HINT:  Could not choose a best candidate procedure. You might need to add explicit type casts.
teledb=#

注意
Anyelement 参数如果写成数组，其意义就跟 anyarray 参数一致，所以  f_any(a_arg anyelement) 与 f_any(a_arg anyarray) 在调用 f_any(ARRAY[1,2]) 时就会出现函数不是唯一化的错误 (ERROR:  function f_any(…) is not unique) 提示。

参数默认值

teledb=# CREATE OR REPLACE PROCEDURE p_default_value (a_int INTEGER DEFAULT 1) AS
$$
BEGIN
    RAISE NOTICE 'a_int = %',a_int;
END;
$$
LANGUAGE PLPGSQL;
CREATE PROCEDURE
teledb=# CALL p_default_value(2);
NOTICE:  a_int = 2
CALL
teledb=# CALL p_default_value(); 
NOTICE:  a_int = 1
CALL
teledb=#

如果原来存在一个p_default_value () 这样的存储过程，则上面的执行就会出错，因为系统无法清楚到底要执行哪个函数，如下所示。

teledb=# CREATE OR REPLACE PROCEDURE p_default_value() AS
$$
BEGIN
    RAISE NOTICE '无参数';
END;
$$
LANGUAGE plpgsql ;
CREATE PROCEDURE
teledb=# CALL p_default_value();
ERROR:  procedure p_default_value() is not unique
LINE 1: CALL p_default_value();
             ^
HINT:  Could not choose a best candidate procedure. You might need to add explicit type casts.
teledb=#

出错提示，p_default_value () 存储过程不是唯一的，这是使用上一个需要特别注意的地方。