*/ MemSet(&CheckpointStats, 0, sizeof(CheckpointStats)); CheckpointStats.ckpt_start_t = GetCurrentTimestamp(); /* * Let smgr prepare for checkpoint; this has to happen outside the * critical section and before we determine the REDO pointer. Note that * smgr must not do anything that'd...
CURRENT_TIME(precision) CURRENT_TIMESTAMP(precision) 还记得上面说的特殊值now吗,实际上跟CURRENT_TIMESTAMP一样: Copy //下面三个完全相等SELECTCURRENT_TIMESTAMP;SELECTTIMESTAMP'now';SELECTnow(); # (2)不带时区信息# LOCALTIME LOCALTIMESTAMP LOCALTIME(precision) LOCALTIMESTAMP(precision) 仅Date 没有时...
age(timestamp) interval 从current_date减去得到的数值 age(timestamp '1957-06-13') 43 years 8 mons 3 days current_date date 今天的日期 current_time time 现在的时间 current_timestamp timestamp 日期和时间 date_part(text, timestamp) double 获取子域(等效于extract) date...
UPDATE "deptDict" SET deptcode=deptcode,deptname=deptname,pycode=pycode,isenabled=isenabled,updatedhisdatetime=CURRENT_TIMESTAMP WHERE deptcode=deptcode; RETURN TRUE; END $body$ LANGUAGE 'plpgsql' VOLATILE; 最后再加上如何执行这个存储过程(函数) -- 执行存储过程方法1 SELECT * FROM 函数名称(参数1...
create or replacefunctiongetMedianTime(starttimeTIMESTAMP,endtimeTIMESTAMP)returns varcharas$$ declare p_day integer;p_hour integer;p_minute integer;p_second integer;sumTime varchar;beginsumTime:='';p_day:=(selectextract(dayFROM(age(endtime,starttime)));ifp_day<>0thensumTime:=sumTime||p_...
1、创建默认时间: datetime default getdate() 1. Oracle: 1、创建默认时间:date default sysdate 1. MySql: 1、创建默认时间: datetime NULL DEFAULT CURRENT_TIMESTAMP COMMENT '创建时间' ; 1. PostgreSql: 1、创建默认时间:datetime varchar(40) DEFAULT (now()) ...
5. INSERT INTO pgbench_history (tid, bid, aid, delta, mtime) VALUES ($1, $2, $3, $4, CURRENT_TIMESTAMP); 6. UPDATE pgbench_accounts SET abalance = abalance + $1 WHERE aid = $2; 7. END; 测试的时候,N从32增大到768,取TPS。结果如下: ...
(pgstat_fetch_stat_bgwriter()->buf_alloc); } Datum pg_stat_get_bgwriter_stat_reset_time(PG_FUNCTION_ARGS) { PG_RETURN_TIMESTAMPTZ(pgstat_fetch_stat_bgwriter()->stat_reset_timestamp); } 还有一个select * from pg_stat_bgwriter ;可以看下这个视图的定义,它的信息综合了bgwriter,checkpointer,...
Java Instant和Postgres TIMESTAMPTZ之间的3位数字差 给定Java中的以下字段: private Instant createdDate = Instant.now(); 对应于Postgres中的以下字段: created_date TIMESTAMPTZ NOT NULL DEFAULT CURRENT_TIMESTAMP; 并使用Spring Data JDBC CrudRepository save(S实体)保存到数据库中。
timestamp?报错postgres 的一个字段是 timestamp 类型 我插入语句是 insert ... (current_timestamp)...