sql - 如何创建默认值为 'now' 的时间戳列？

Question

如何创建一个时间戳列默认为 DATETIME('now') 的表？

像这样:

CREATE TABLE test (
    id INTEGER PRIMARY KEY AUTOINCREMENT, 
    t TIMESTAMP DEFAULT DATETIME('now')
);

这会出错。

Answer 1

截至version 3.1.0您可以将 CURRENT_TIMESTAMP 与 DEFAULT 一起使用子句:

If the default value of a column is CURRENT_TIME, CURRENT_DATE or CURRENT_TIMESTAMP, then the value used in the new row is a text representation of the current UTC date and/or time. For CURRENT_TIME, the format of the value is "HH:MM:SS". For CURRENT_DATE, "YYYY-MM-DD". The format for CURRENT_TIMESTAMP is "YYYY-MM-DD HH:MM:SS".

CREATE TABLE test (
    id INTEGER PRIMARY KEY AUTOINCREMENT,
    t TIMESTAMP DEFAULT CURRENT_TIMESTAMP
);