Postgresql使用函数初始化所有索引初始值

	select * from 序列值名称(Exp:user_id_seq);
	ALTER SEQUENCE  user_id_seq restart with 4;

实际修改的是last_value值

CREATE OR REPLACE FUNCTION "public"."initseq"()
  RETURNS "pg_catalog"."int4" AS $BODY$
DECLARE 
		mysql text;
		seqnames RECORD;
		num int4 := 0;
BEGIN
	FOR seqnames in select relname from pg_class where relowner=(select usesysid from pg_user where usename='数据库用户名') and relkind='S' LOOP
		mysql:= 'ALTER SEQUENCE '||quote_ident(seqnames.relname) || ' RESTART WITH 1';
		-- WITH 1表示添加下一条数据的ID值
		EXECUTE mysql;
		num := num +1;
	END LOOP;
	RETURN num;
END;
$BODY$
  LANGUAGE plpgsql VOLATILE
  COST 100

执行之后会将所有已有序列初始化值为1.