在PostgreSQL中,您可以使用CURRENT_TIMESTAMP函数来获取当前的时间戳,或者使用CURRENT_DATE函数获取当前日期。 示例: 获取当前时间戳: ="hljs">="hljs-keyword">SELECT="hljs-built_in">CURRENT_TIMESTAMP;="2"> 获取当前日期: ="hljs">="hljs-keyword">SELECT="hljs-built_in">CURRENT_DATE; 这些函数将...
lock.locktag_lockmethodid, lockmode); TimestampDifference(get_timeout_start_time(DEADLOCK_TIMEOUT), GetCurrentTimestamp(), &secs, &usecs); msecs = secs * 1000 + usecs / 1000; usecs = usecs % 1000; if (deadlock_state == DS_SOFT_DEADLOCK) ereport(LOG, (errmsg(...
Returns zero (a time safely in the past) if we are willing to wait forever. */ static TimestampTz GetStandbyLimitTime(void) { TimestampTz rtime; bool fromStream; /* * The cutoff time is the last WAL data receipt time plus the appropriate delay variable. Delay of -1 means wait foreve...
ProcSleep ResolveRecoveryConflictWithLock if (GetCurrentTimestamp() >= ltime && ltime != 0) VirtualTransactionId *backends; backends = GetLockConflicts(&locktag, AccessExclusiveLock); ResolveRecoveryConflictWithVirtualXIDs(backends, PROCSIG_RECOVERY_CONFLICT_LOCK, false) VirtualTransactionId是什么?
And this function gets the current date and time… Important syntax requirement: this has to go between parentheses()! I’ll give you two examples to make this clear! If you want to get the current year, just type this: SELECT date_part('year', (SELECT current_timestamp)); ...
,to_char(to_timestamp(CAST(EXTRACT(EPOCH FROM CURRENT_TIMESTAMP )* 1000 AS int8) / 1000) AT TIME ZONE 'PRC', 'yyyy-mm-dd hh24:mi:ss') 时间戳转日期 epoch 表示距新世纪 1970-01-01 00:00:00 的秒数. SQL SERVER --普通时间 转 13 位时间戳SELECTCONVERT(BIGINT,DATEDIFF(MI,'1970-01...
ckpt_start_t = GetCurrentTimestamp(); /* * Use a critical section to force system panic if we have trouble. */ START_CRIT_SECTION(); if (shutdown) { LWLockAcquire(ControlFileLock, LW_EXCLUSIVE); ControlFile->state = DB_SHUTDOWNING; ControlFile->time = (pg_time_t) time(NULL); ...
couldn't get a connection to the database - Postgres Job Scheduling issued (Windows based machine) pgAgent (PostgreSQL定时任务) 在PostgreSQL 的基本安装中并没有定时任务这一项,必须和PostGis一样通过组件的方式安装,该组件的名字叫 PgAgent,安装了此组件才能在 PostgreSQL 中创建定时任务。
*/s->state=TRANS_PREPARE;//获得当前时间prepared_at=GetCurrentTimestamp();/* *将prepare transaction事务的信息保存到共享内存中,这时候会检查已有的prepare transaction * 避免gid冲突 */gxact=MarkAsPreparing(xid,prepareGID,prepared_at,GetUserId(),MyDatabaseId);prepareGID=NULL;//收集两阶段提交过程中...
PG除支持标准SQL类型(如INT、VARCHAR、TIMESTAMP),还提供几何类型(如POINT、POLYGON)、数组类型(如INT[])及用户自定义类型。 CREATE TABLE employees ( id SERIAL PRIMARY KEY, -- SERIAL自动生成唯一标识符 name TEXT NOT NULL, -- TEXT类型存储长文本(无长度限制) ...