日期字段將自動填寫

Question

我使用PostgreSQL和創建見下表：

CREATE TABLE "TrainingMatrix" 
(
    payroll text NOT NULL, 
    "TrainingName" text NOT NULL, 
    "Institute" text, 
    "TrainingDate" date NOT NULL, 
    "ExpiryDate" date, 
    "RecorderName" text, 
    "EnteringDate" date, 
    CONSTRAINT "TrainingMatrix_pkey" PRIMARY KEY (payroll, "TrainingName", "TrainingDate") 
) 

我想讓EnteringDate被自動由當前的日期在機器每次進入記錄填寫。

Answer 1

CREATE TABLE "TrainingMatrix" 
(
    payroll text NOT NULL, 
    "TrainingName" text NOT NULL, 
    "Institute" text, 
    "TrainingDate" date NOT NULL, 
    "ExpiryDate" date, 
    "RecorderName" text, 
    "EnteringDate" date NOT NULL default current_date,--"EnteringDate" date, 
    CONSTRAINT "TrainingMatrix_pkey" PRIMARY KEY (payroll, "TrainingName", "TrainingDate") 
) 

Answer 2

使用默認的關鍵字

column datatype default sysdate 

檢查這個問題，以及

How to set default value for column of new created table from select statement in 11g

Answer 3

通過使用默認的系統日期，你可以achive所需的輸出。

CREATE TABLE "TrainingMatrix" 
(
    payroll text NOT NULL, 
    "TrainingName" text NOT NULL, 
    "Institute" text, 
    "TrainingDate" date NOT NULL, 
    "ExpiryDate" date, 
    "RecorderName" text, 
    "EnteringDate" date default sysdate, 
    CONSTRAINT "TrainingMatrix_pkey" PRIMARY KEY (payroll, "TrainingName", "TrainingDate") 
) 

Answer 4

CREATE TABLE "TrainingMatrix" 
(
    payroll text NOT NULL, 
    "TrainingName" text NOT NULL, 
    "Institute" text, 
    "TrainingDate" date NOT NULL, 
    "ExpiryDate" date, 
    "RecorderName" text, 
    "EnteringDate" date not null default current_timestamp, 
    CONSTRAINT "TrainingMatrix_pkey" PRIMARY KEY (payroll, "TrainingName", "TrainingDate") 
) 

CURRENT_TIMESTAMP是equivelent到現在（）將給當前日期&時間（包括時區）http://www.postgresql.org/docs/8.1/static/functions-datetime.html

定義列不空也將有助於確保沒有記錄明確地進入沒有時間戳。