我的当前函数:
DECLARE
day integer;
year integer;
tablename text;
startdate text;
enddate text;
BEGIN
day:=date_part('doy',to_timestamp(NEW.date));
year:=date_part('year',to_timestamp(NEW.date));
tablename:='pings_'||year||'_'||day||'_'||NEW.id;
-- RAISE EXCEPTION 'tablename=%',tablename;
PERFORM 'tablename' FROM pg_tables WHERE 'schemaname'=tablename;
-- RAISE EXCEPTION 'found=%',FOUND;
IF FOUND <> TRUE THEN
startdate:=date_part('year',to_timestamp(NEW.date))||'-'||date_part('month',to_timestamp(NEW.date))||'-'||date_part('day',to_timestamp(NEW.date));
enddate:=startdate::timestamp + INTERVAL '1 day';
EXECUTE 'CREATE TABLE $1 (
CHECK ( date >= DATE $2 AND date < DATE $3 )
) INHERITS (pings)' USING quote_ident(tablename),startdate,enddate;
END IF;
EXECUTE 'INSERT INTO $1 VALUES (NEW.*)' USING quote_ident(tablename);
RETURN NULL;
END;
我想让它自动创建一个名为
pings_YEAR_DOY_ID
的表格,但它总是失败并显示以下错误信息:2011-10-24 13:39:04 CDT [15804]: [1-1] ERROR: invalid input syntax for type double precision: "-" at character 45
2011-10-24 13:39:04 CDT [15804]: [2-1] QUERY: SELECT date_part('year',to_timestamp( $1 ))+'-'+date_part('month',to_timestamp( $2 ))+'-'+date_part('day',to_timestamp( $3 ))
2011-10-24 13:39:04 CDT [15804]: [3-1] CONTEXT: PL/pgSQL function "ping_partition" line 15 at assignment
2011-10-24 13:39:04 CDT [15804]: [4-1] STATEMENT: INSERT INTO pings VALUES (0,0,5);
尝试2
应用更改并进行了一些修改(日期是unixtimestamp列,我的想法是在选择时整数列比时间戳列快),我得到了下面的错误,不确定是否使用了USING NEW
的正确语法?
更新后的函数:
CREATE FUNCTION ping_partition() RETURNS trigger
LANGUAGE plpgsql
AS $_$DECLARE
day integer;
year integer;
tablename text;
startdate text;
enddate text;
BEGIN
day:=date_part('doy',to_timestamp(NEW.date));
year:=date_part('year',to_timestamp(NEW.date));
tablename:='pings_'||year||'_'||day||'_'||NEW.id;
-- RAISE EXCEPTION 'tablename=%',tablename;
PERFORM 'tablename' FROM pg_tables WHERE 'schemaname'=tablename;
-- RAISE EXCEPTION 'found=%',FOUND;
IF FOUND <> TRUE THEN
startdate := to_char(to_timestamp(NEW.date), 'YYYY-MM-DD');
enddate:=startdate::timestamp + INTERVAL '1 day';
EXECUTE 'CREATE TABLE ' || quote_ident(tablename) || ' (
CHECK ( date >= EXTRACT(EPOCH FROM DATE ' || quote_literal(startdate) || ')
AND date < EXTRACT(EPOCH FROM DATE ' || quote_literal(enddate) || ') )
) INHERITS (pings)';
END IF;
EXECUTE 'INSERT INTO ' || quote_ident(tablename) || ' SELECT $1' USING NEW;
RETURN NULL;
END;
$_$;
我的声明:
INSERT INTO pings VALUES (0,0,5);
SQL错误:
ERROR: column "date" is of type integer but expression is of type pings
LINE 1: INSERT INTO pings_1969_365_0 SELECT $1
^
HINT: You will need to rewrite or cast the expression.
QUERY: INSERT INTO pings_1969_365_0 SELECT $1
CONTEXT: PL/pgSQL function "ping_partition" line 22 at EXECUTE statement