BEFORE UPDATE ON your_tableFOR EACH ROWEXECUTE PROCEDURE update_timestamp();from sqlalchemy import Column, Integer, String, DateTime, func from db.base_class import Base class Demo(Base): # 表的名字: __tablename__
CREATE TABLE `student` ( `id` bigint(20) unsigned NOT NULL AUTO_INCREMENT COMMENT '主键', `gmt_create` datetime NOT NULL DEFAULT CURRENT_TIMESTAMP COMMENT '创建时间', `gmt_modified` datetime NOT NULL DEFAULT CURRENT_TIMESTAMP ON UPDATE CURRENT_TIMESTAMP COMMENT '修改时间', student_id varcha...
| desc | varchar(256) | YES | | NULL | | | update_time | timestamp | NO | | CURRENT_TIMESTAMP | on update CURRENT_TIMESTAMP | 1. 2. 3. 4. 5. 6. 7. 8. 根据step参数来控制每次批量生成数目,比如step=1000,根据max_id+step来计算每种业务tag的号段区间,不同tag之间互不影响,即不...
'YYYY-MM-DD HH24:MI:SS.US')ANDcreatetime <= to_timestamp('2013-04-22 23:59:59', 'YYYY-MM-DD HH24:MI:SS.US')ANDto_char(updatetime, 'YYYY-MM-DD') >= to_char(to_date('2013-01-22', 'YYYY-MM-DD
(id int,time timestamp); insert into t_rec values (1,now()); insert into t_rec values (2,now()); insert into t_rec values (3,now()); insert into t_rec values (4,now()); insert into t_rec values (5,now()); select pg_switch_wal(); checkpoint; select * from t_rec; ...
n_tup_del bigint,n_tup_hot_upd bigint,n_live_tup bigint,n_dead_tup bigint,last_vacuum timestamp,last_autovacuum timestamp,last_analyze timestamp,last_autoanalyze timestamp,vacuum_count bigint,autovacuum_count bigint,analyze_count bigint,autoanalyze_count bigint, ...
PostgreSQL天然集群,多个集群可以组成集簇,有点类似军队的连、团、旅这样的组织规则。对于我们日常学习使用的单节点则是单个集簇单个集群,自己就是集群。 PostgreSQL如何管理这种集群规则?答案是通过一个无符号4个字节的标识进行管理,一个对象就是集群里的一个数据库。
CREATE TABLE IF NOT EXISTS `accounts`( `id` INT UNSIGNED AUTO_INCREMENT, `owner` VARCHAR(100) NOT NULL, `balance` INT NOT NULL, `currency` VARCHAR(100) NOT NULL, `create_at` TIMESTAMP DEFAULT CURRENT_TIMESTAMP ON UPDATE CURRENT_TIMESTAMP, PRIMARY KEY ( `id` ) USING BTREE )ENGINE=Inn...
CREATETABLExxl_job_log_report(id serialPRIMARYKEY,trigger_day timestampNULL,running_count intNOTNULLDEFAULT'0',suc_count intNOTNULLDEFAULT'0',fail_count intNOTNULLDEFAULT'0',update_time timestampNULL);COMMENTONCOLUMNxxl_job_log_report.trigger_dayIS'调度-时间';COMMENTONCOLUMNxxl_job_log_report....
},add_time:DataTypes.INTEGER,last_login:DataTypes.INTEGER,username:DataTypes.STRING,password:DataTypes.STRING,email:DataTypes.STRING,login_ip:DataTypes.STRING,},{sequelize,indexes:[{unique:true,fields:["id"],},],freezeTableName:true,timestamps:false,//是否自动添加时间戳createAt，updateAt...