PostgreSQL函数:用以查询某表的详细 包含表字段的注释信息

感谢PostgreSQL论坛阿弟

CREATE OR REPLACE FUNCTION pgsql_type(a_type varchar) RETURNS varchar AS
$BODY$
DECLARE
     v_type varchar;
BEGIN
     IF a_type='int8' THEN
          v_type:='bigint';
     ELSIF a_type='int4' THEN
          v_type:='integer';
     ELSIF a_type='int2' THEN
          v_type:='smallint';
     ELSIF a_type='bpchar' THEN
          v_type:='char';
     ELSE
          v_type:=a_type;
     END IF;
     RETURN v_type;
END;
$BODY$
LANGUAGE PLPGSQL;

CREATE TYPE "public"."tablestruct" AS (
  "fields_key_name" varchar(100),
  "fields_name" VARCHAR(200),
  "fields_type" VARCHAR(20),
  "fields_length" BIGINT,
  "fields_not_null" VARCHAR(10),
  "fields_default" VARCHAR(500),
  "fields_comment" VARCHAR(1000)
);

CREATE OR REPLACE FUNCTION "public"."table_msg" (a_schema_name varchar, a_table_name varchar) RETURNS SETOF "public"."tablestruct" AS
$body$
DECLARE
     v_ret tablestruct;
     v_oid oid;
     v_sql varchar;
     v_rec RECORD;
     v_key varchar;
BEGIN
     SELECT
           pg_class.oid  INTO v_oid
     FROM
           pg_class
           INNER JOIN pg_namespace ON (pg_class.relnamespace = pg_namespace.oid AND lower(pg_namespace.nspname) = a_schema_name)
     WHERE
           pg_class.relname=a_table_name;
     IF NOT FOUND THEN
         RETURN;
     END IF;

     v_sql='
     SELECT
           pg_attribute.attname AS fields_name,
           pg_attribute.attnum AS fields_index,
           pgsql_type(pg_type.typname::varchar) AS fields_type,
           pg_attribute.atttypmod-4 as fields_length,
           CASE WHEN pg_attribute.attnotnull  THEN ''not null''
           ELSE ''''
           END AS fields_not_null,
           pg_attrdef.adsrc AS fields_default,
           pg_description.description AS fields_comment
     FROM
           pg_attribute
           INNER JOIN pg_class  ON pg_attribute.attrelid = pg_class.oid
           INNER JOIN pg_type   ON pg_attribute.atttypid = pg_type.oid
           LEFT OUTER JOIN pg_attrdef ON pg_attrdef.adrelid = pg_class.oid AND pg_attrdef.adnum = pg_attribute.attnum
           LEFT OUTER JOIN pg_description ON pg_description.objoid = pg_class.oid AND pg_description.objsubid = pg_attribute.attnum
     WHERE
           pg_attribute.attnum > 0
           AND attisdropped <> ''t''
           AND pg_class.oid = ' || v_oid || '
     ORDER BY pg_attribute.attnum' ;

     FOR v_rec IN EXECUTE v_sql LOOP
         v_ret.fields_name=v_rec.fields_name;
         v_ret.fields_type=v_rec.fields_type;
         IF v_rec.fields_length > 0 THEN
            v_ret.fields_length:=v_rec.fields_length;
         ELSE
            v_ret.fields_length:=NULL;
         END IF;
         v_ret.fields_not_null=v_rec.fields_not_null;
         v_ret.fields_default=v_rec.fields_default;
         v_ret.fields_comment=v_rec.fields_comment;
         SELECT constraint_name INTO v_key FROM information_schema.key_column_usage WHERE table_schema=a_schema_name AND table_name=a_table_name AND column_name=v_rec.fields_name;
         IF FOUND THEN
            v_ret.fields_key_name=v_key;
         ELSE
            v_ret.fields_key_name='';
         END IF;
         RETURN NEXT v_ret;
     END LOOP;
     RETURN ;
END;
$body$
LANGUAGE 'plpgsql' VOLATILE CALLED ON NULL INPUT SECURITY INVOKER;

COMMENT ON FUNCTION "public"."table_msg"(a_schema_name varchar, a_table_name varchar)
IS '获得表信息';

---重载一个函数
CREATE OR REPLACE FUNCTION "public"."table_msg" (a_table_name varchar) RETURNS SETOF "public"."tablestruct" AS
$body$
DECLARE
    v_ret tablestruct;
BEGIN
    FOR v_ret IN SELECT * FROM table_msg('public',a_table_name) LOOP
        RETURN NEXT v_ret;
    END LOOP;
    RETURN;
END;
$body$
LANGUAGE 'plpgsql' VOLATILE CALLED ON NULL INPUT SECURITY INVOKER;

COMMENT ON FUNCTION "public"."table_msg"(a_table_name varchar)
IS '获得表信息';

例子

CREATE TABLE "public"."login_log" (
  "auto_bh" BIGSERIAL, 
  "yhm" VARCHAR(20) NOT NULL, 
  "dlsj" TIMESTAMP WITHOUT TIME ZONE DEFAULT date_trunc('second'::text, ('now'::text)::timestamp(6) with time zone) NOT NULL, 
  "dlip" VARCHAR(30) NOT NULL, 
  "dcsj" TIMESTAMP WITHOUT TIME ZONE DEFAULT date_trunc('second'::text, ('now'::text)::timestamp(6) with time zone) NOT NULL, 
  "zc" CHAR(4) NOT NULL, 
  "zxsj" VARCHAR(20) DEFAULT '00:00:00'::character varying, 
  CONSTRAINT "login_log_pkey" PRIMARY KEY("auto_bh", "dlsj")
) WITH OIDS;

COMMENT ON TABLE "public"."login_log"
IS '用户登录日记档';

COMMENT ON COLUMN "public"."login_log"."auto_bh"
IS '系统编号';

COMMENT ON COLUMN "public"."login_log"."yhm"
IS '用户名';

COMMENT ON COLUMN "public"."login_log"."dlsj"
IS '登录时间';

COMMENT ON COLUMN "public"."login_log"."dlip"
IS '登录IP';

COMMENT ON COLUMN "public"."login_log"."dcsj"
IS '登出时间';

COMMENT ON COLUMN "public"."login_log"."zc"
IS '进出';

COMMENT ON COLUMN "public"."login_log"."zxsj"
IS '在线时间';

select * from table_msg('public','login_log');
或
select * from table_msg('login_log');

结果
fields_key_name | fields_name | fields_type | fields_length | fields_not_null |                             fields_default                             | fields_comment
-----------------+-------------+-------------+---------------+-----------------+------------------------------------------------------------------------+----------------
 login_log_pkey  | auto_bh     | bigint      |               | not null        | nextval('public.login_log_auto_bh_seq'::text)                          | 系统编号
                 | yhm         | varchar     |            20 | not null        |                                                                        | 用户名
                 | dlsj        | timestamp   |               | not null        | date_trunc('second'::text, ('now'::text)::timestamp(6) with time zone) | 登录时间
                 | dlip        | varchar     |            30 | not null        |                                                                        | 登录IP
                 | dcsj        | timestamp   |               | not null        | date_trunc('second'::text, ('now'::text)::timestamp(6) with time zone) | 登出时间
                 | zc          | char        |             4 | not null        |                                                                        | 进出
                 | zxsj        | varchar     |            20 |                 | '00:00:00'::character varying                                          | 在线时间
(7 rows)