postgresql 按小時(shí)分表（含觸發(fā)器）的實(shí)現(xiàn)方式

CREATE OR REPLACE FUNCTION auto_insert_into_tbl_partition()
 RETURNS trigger AS
$BODY$
DECLARE
  time_column_name   text ;      -- 父表中用于分區(qū)的時(shí)間字段的名稱[必須首先初始化!!]
  curMM     varchar(16);    -- 'YYYYMM'字串,用做分區(qū)子表的后綴
  isExist     boolean;    -- 分區(qū)子表,是否已存在
  strSQL     text;
  
BEGIN
  -- 調(diào)用前,必須首先初始化(時(shí)間字段名):time_column_name [直接從調(diào)用參數(shù)中獲取!!]
  time_column_name := TG_ARGV[0];
  
  -- 判斷對(duì)應(yīng)分區(qū)表 是否已經(jīng)存在?
  EXECUTE 'SELECT $1.'||time_column_name INTO strSQL USING NEW;
  curMM := to_char( strSQL::timestamp , 'YYYYMMDDHH' );
  select count(1) INTO isExist from pg_class where relname = ('t_audit_'||curMM);
 
  -- 若不存在, 則插入前需 先創(chuàng)建子分區(qū)
  IF ( isExist = false ) THEN 
    -- 創(chuàng)建子分區(qū)表
    strSQL := 'CREATE TABLE IF NOT EXISTS t_audit_'||curMM||'() INHERITS (t_audit);' ; 
    EXECUTE strSQL;
    -- 創(chuàng)建索引
    strSQL := 'CREATE INDEX t_audit_'||curMM||'_INDEX_'||time_column_name||' ON t_audit_'||curMM||' ('||time_column_name||');' ;
    EXECUTE strSQL;
  END IF;
 
  -- 插入數(shù)據(jù)到子分區(qū)!
  strSQL := 'INSERT INTO t_audit_'||curMM||' SELECT $1.*' ;
  EXECUTE strSQL USING NEW;
  RETURN NULL; 
END
$BODY$
 LANGUAGE plpgsql;

CREATE TRIGGER insert_tbl_partition_trigger
 BEFORE INSERT
 ON t_audit
 FOR EACH ROW
 EXECUTE PROCEDURE auto_insert_into_tbl_partition('time');

CREATE OR REPLACE FUNCTION "public"."trigger_day_aqi"()
 RETURNS "pg_catalog"."trigger" AS $BODY$
BEGIN
  --日均值表，沒有o3,小時(shí)值表，沒有o3_8h
   NEW.so2iaqi=DAY_SO2_AQI(NEW.so2);
     NEW.no2iaqi=DAY_NO2_AQI(NEW.no2);
     NEW.coiaqi=DAY_CO_AQI(NEW.co);
     NEW.o3_8hiaqi=O3_8_AQI(NEW.o3_8h);
     NEW.pm10iaqi=PM10_AQI(NEW.pm10);
     NEW.pm25iaqi=PM25_AQI(NEW.pm25);
     NEW.aqi=NEW.coiaqi;
     NEW.primarypol='CO';
    IF NEW.aqiNEW.no2iaqi  then  NEW.aqi=NEW.no2iaqi;  NEW.primarypol='NO2';  end if;
    IF NEW.aqiNEW.so2iaqi  then  NEW.aqi=NEW.so2iaqi;  NEW.primarypol='SO2';  end if;
    IF NEW.aqiNEW.o3_8hiaqi then  NEW.aqi=NEW.o3_8hiaqi;  NEW.primarypol='O3_8H'; end if;
    IF NEW.aqiNEW.pm10iaqi then  NEW.aqi=NEW.pm10iaqi;  NEW.primarypol='PM10';  end if;
    IF NEW.aqiNEW.pm25iaqi then  NEW.aqi=NEW.pm25iaqi;  NEW.primarypol='PM2.5'; end if; 
    IF NEW.aqi=50      then  NEW.primarypol='-';   end if;
     NEW.aqilevel=getRank(NEW.aqi);
  RETURN NEW;
END;
$BODY$
 LANGUAGE plpgsql VOLATILE
 COST 100

CREATE TRIGGER gk_site_day_insert BEFORE INSERT ON gk_site_day
  FOR EACH ROW EXECUTE PROCEDURE trigger_day_aqi();