PostgreSQL/Postgre SQL/Insert Data

Insert data to a log table

postgres=#
postgres=# create table logtable(t varchar(10), value varchar(10));
CREATE TABLE
postgres=#
postgres=#
postgres=# CREATE FUNCTION logfunc1(logtxt text) RETURNS timestamp AS $$
postgres$#    BEGIN
postgres$#        INSERT INTO logtable VALUES (logtxt, "now");
postgres$#        RETURN "now";
postgres$#    END;
postgres$# $$ LANGUAGE plpgsql;
CREATE FUNCTION
postgres=#
postgres=# select logfunc1("text");
          REATE
        logfunc1
-------------------------
 2006-10-21 15:16:38.375
(1 row)
postgres=#
postgres=# select * from logtable;
    REATE
  t   | value
------+-------
 text | now
(1 row)
postgres=#
postgres=# drop function logfunc1(logtxt text);
DROP FUNCTION
postgres=# drop table logtable;
DROP TABLE
postgres=#
postgres=#

Using function to insert data to a table

postgres=#
postgres=#
postgres=# CREATE TABLE "shipments" (
postgres(#      "id" integer NOT NULL,
postgres(#      "customer_id" integer,
postgres(#      "isbn" text,
postgres(#      "ship_date" timestamp with time zone
postgres(# );
CREATE TABLE
postgres=# insert into shipments values (2,    107,  "0394800753","2001-09-22 20:18:56-07");
INSERT 0 1
postgres=#
postgres=# select * from shipments;
 id | customer_id |    isbn    |       ship_date
----+-------------+------------+------------------------
  2 |         107 | 0394800753 | 2001-09-22 20:18:56-07
(1 row)
postgres=#
postgres=# drop function add_shipment(integer,text);
DROP FUNCTION
postgres=#
postgres=# CREATE FUNCTION "add_shipment" (integer,text) RETURNS timestamp with time zone AS "
postgres"#   DECLARE
postgres"#     customer_id ALIAS FOR $1;
postgres"#     isbn ALIAS FOR $2;
postgres"#     shipment_id INTEGER;
postgres"#     right_now timestamp;
postgres"#   BEGIN
postgres"#     right_now := ""now"";
postgres"#     INSERT INTO shipments VALUES ( 3, customer_id, isbn, right_now );
postgres"#     RETURN right_now;
postgres"#   END;
postgres"# " LANGUAGE "plpgsql";
CREATE FUNCTION
postgres=#
postgres=# select add_shipment(1,"newItem");
        add_shipment
----------------------------
 2006-10-09 10:06:16.195-07
(1 row)
postgres=#
postgres=# select * from shipments;
 id | customer_id |    isbn    |         ship_date
----+-------------+------------+----------------------------
  2 |         107 | 0394800753 | 2001-09-22 20:18:56-07
  3 |           1 | newItem    | 2006-10-09 10:06:16.195-07
(2 rows)
postgres=#
postgres=# drop table shipments;
DROP TABLE
postgres=#