用以查询某表的详细包含表字段的注释信息 · postgresql手册

### [PostgreSQL函数:用以查询某表的详细包含表字段的注释信息](http://lovejuan1314.iteye.com/blog/1167680)** **博客分类：** - [数据库(Oracle/Postgresql/Hypertable等)](http://lovejuan1314.iteye.com/category/32183) 感谢PostgreSQL论坛阿弟 Sql代码 [![收藏代码](http://lovejuan1314.iteye.com/images/icon_star.png)](# "收藏这段代码") 1. CREATE OR REPLACE FUNCTION pgsql_type(a_type varchar) RETURNS varchar AS 1. $BODY$ 1. DECLARE 1. v_type varchar; 1. BEGIN 1. IF a_type='int8' THEN 1. v_type:='bigint'; 1. ELSIF a_type='int4' THEN 1. v_type:='integer'; 1. ELSIF a_type='int2' THEN 1. v_type:='smallint'; 1. ELSIF a_type='bpchar' THEN 1. v_type:='char'; 1. ELSE 1. v_type:=a_type; 1. END IF; 1. RETURN v_type; 1. END; 1. $BODY$ 1. LANGUAGE PLPGSQL; 1. 1. CREATE TYPE "public"."tablestruct" AS ( 1. "fields_key_name" varchar(100), 1. "fields_name" VARCHAR(200), 1. "fields_type" VARCHAR(20), 1. "fields_length" BIGINT, 1. "fields_not_null" VARCHAR(10), 1. "fields_default" VARCHAR(500), 1. "fields_comment" VARCHAR(1000) 1. ); 1. 1. CREATE OR REPLACE FUNCTION "public"."table_msg" (a_schema_name varchar, a_table_name varchar) RETURNS SETOF "public"."tablestruct" AS 1. $body$ 1. DECLARE 1. v_ret tablestruct; 1. v_oid oid; 1. v_sql varchar; 1. v_rec RECORD; 1. v_key varchar; 1. BEGIN 1. SELECT 1. pg_class.oid INTO v_oid 1. FROM 1. pg_class 1. INNER JOIN pg_namespace ON (pg_class.relnamespace = pg_namespace.oid AND lower(pg_namespace.nspname) = a_schema_name) 1. WHERE 1. pg_class.relname=a_table_name; 1. IF NOT FOUND THEN 1. RETURN; 1. END IF; 1. 1. v_sql=' 1. SELECT 1. pg_attribute.attname AS fields_name, 1. pg_attribute.attnum AS fields_index, 1. pgsql_type(pg_type.typname::varchar) AS fields_type, 1. pg_attribute.atttypmod-4 as fields_length, 1. CASE WHEN pg_attribute.attnotnull THEN ''not null'' 1. ELSE '''' 1. END AS fields_not_null, 1. pg_attrdef.adsrc AS fields_default, 1. pg_description.description AS fields_comment 1. FROM 1. pg_attribute 1. INNER JOIN pg_class ON pg_attribute.attrelid = pg_class.oid 1. INNER JOIN pg_type ON pg_attribute.atttypid = pg_type.oid 1. LEFT OUTER JOIN pg_attrdef ON pg_attrdef.adrelid = pg_class.oid AND pg_attrdef.adnum = pg_attribute.attnum 1. LEFT OUTER JOIN pg_description ON pg_description.objoid = pg_class.oid AND pg_description.objsubid = pg_attribute.attnum 1. WHERE 1. pg_attribute.attnum > 0 1. AND attisdropped <> ''t'' 1. AND pg_class.oid = ' || v_oid || ' 1. ORDER BY pg_attribute.attnum' ; 1. 1. FOR v_rec IN EXECUTE v_sql LOOP 1. v_ret.fields_name=v_rec.fields_name; 1. v_ret.fields_type=v_rec.fields_type; 1. IF v_rec.fields_length > 0 THEN 1. v_ret.fields_length:=v_rec.fields_length; 1. ELSE 1. v_ret.fields_length:=NULL; 1. END IF; 1. v_ret.fields_not_null=v_rec.fields_not_null; 1. v_ret.fields_default=v_rec.fields_default; 1. v_ret.fields_comment=v_rec.fields_comment; 1. 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; 1. IF FOUND THEN 1. v_ret.fields_key_name=v_key; 1. ELSE 1. v_ret.fields_key_name=''; 1. END IF; 1. RETURN NEXT v_ret; 1. END LOOP; 1. RETURN ; 1. END; 1. $body$ 1. LANGUAGE 'plpgsql' VOLATILE CALLED ON NULL INPUT SECURITY INVOKER; 1. 1. COMMENT ON FUNCTION "public"."table_msg"(a_schema_name varchar, a_table_name varchar) 1. IS '获得表信息'; 1. 1. ---重载一个函数 1. CREATE OR REPLACE FUNCTION "public"."table_msg" (a_table_name varchar) RETURNS SETOF "public"."tablestruct" AS 1. $body$ 1. DECLARE 1. v_ret tablestruct; 1. BEGIN 1. FOR v_ret IN SELECT * FROM table_msg('public',a_table_name) LOOP 1. RETURN NEXT v_ret; 1. END LOOP; 1. RETURN; 1. END; 1. $body$ 1. LANGUAGE 'plpgsql' VOLATILE CALLED ON NULL INPUT SECURITY INVOKER; 1. 1. COMMENT ON FUNCTION "public"."table_msg"(a_table_name varchar) 1. IS '获得表信息'; Sql代码 [![收藏代码](http://lovejuan1314.iteye.com/images/icon_star.png)](# "收藏这段代码") 1. 例子 1. 1. CREATE TABLE "public"."login_log" ( 1. "auto_bh" BIGSERIAL, 1. "yhm" VARCHAR(20) NOT NULL, 1. "dlsj" TIMESTAMP WITHOUT TIME ZONE DEFAULT date_trunc('second'::text, ('now'::text)::timestamp(6) with time zone) NOT NULL, 1. "dlip" VARCHAR(30) NOT NULL, 1. "dcsj" TIMESTAMP WITHOUT TIME ZONE DEFAULT date_trunc('second'::text, ('now'::text)::timestamp(6) with time zone) NOT NULL, 1. "zc" CHAR(4) NOT NULL, 1. "zxsj" VARCHAR(20) DEFAULT '00:00:00'::character varying, 1. CONSTRAINT "login_log_pkey" PRIMARY KEY("auto_bh", "dlsj") 1. ) WITH OIDS; 1. 1. COMMENT ON TABLE "public"."login_log" 1. IS '用户登录日记档'; 1. 1. COMMENT ON COLUMN "public"."login_log"."auto_bh" 1. IS '系统编号'; 1. 1. COMMENT ON COLUMN "public"."login_log"."yhm" 1. IS '用户名'; 1. 1. COMMENT ON COLUMN "public"."login_log"."dlsj" 1. IS '登录时间'; 1. 1. COMMENT ON COLUMN "public"."login_log"."dlip" 1. IS '登录IP'; 1. 1. COMMENT ON COLUMN "public"."login_log"."dcsj" 1. IS '登出时间'; 1. 1. COMMENT ON COLUMN "public"."login_log"."zc" 1. IS '进出'; 1. 1. COMMENT ON COLUMN "public"."login_log"."zxsj" 1. IS '在线时间'; 1. 1. select * from table_msg('public','login_log'); 1. 或 1. select * from table_msg('login_log'); 1. 1. 结果 1. fields_key_name | fields_name | fields_type | fields_length | fields_not_null | fields_default | fields_comment 1. -----------------+-------------+-------------+---------------+-----------------+------------------------------------------------------------------------+---------------- 1. login_log_pkey | auto_bh | bigint | | not null | nextval('public.login_log_auto_bh_seq'::text) | 系统编号 1. | yhm | varchar | 20 | not null | | 用户名 1. | dlsj | timestamp | | not null | date_trunc('second'::text, ('now'::text)::timestamp(6) with time zone) | 登录时间 1. | dlip | varchar | 30 | not null | | 登录IP 1. | dcsj | timestamp | | not null | date_trunc('second'::text, ('now'::text)::timestamp(6) with time zone) | 登出时间 1. | zc | char | 4 | not null | | 进出 1. | zxsj | varchar | 20 | | '00:00:00'::character varying | 在线时间 1. 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