command.or command.or 解释 ：数据库查询指令，用于连接多个筛选条件，各条件之间满足逻辑”或”的关系。或指令有两种用法，一是进行同一字段的”或”查询操作，二是可以进行不同字段直接的”或”查询操作。该指令接受数组类型的参数。 例如，筛选出数据表中 age 小于 25 或者大于 50 的用户 代码示例 级联查询写法： ...

seconds_diff description Syntax example keywords seconds_diff description Syntax INT seconds_diff(DATETIME enddate, DATETIME startdate) The difference between the start ...

seconds_diff description Syntax example keywords seconds_diff description Syntax INT seconds_diff(DATETIME enddate, DATETIME startdate) The difference between the start ...

seconds_diff description Syntax example keywords seconds_diff description Syntax INT seconds_diff(DATETIME enddate, DATETIME startdate) 开始时间到结束时间相差几秒 example mysql > ...

seconds_diff description Syntax example keywords seconds_diff description Syntax INT seconds_diff(DATETIME enddate, DATETIME startdate) The difference between the start ...

seconds_diff description Syntax example keywords seconds_diff description Syntax INT seconds_diff(DATETIME enddate, DATETIME startdate) 开始时间到结束时间相差几秒 example mysql > ...

seconds_diff description Syntax example keywords seconds_diff description Syntax INT seconds_diff(DATETIME enddate, DATETIME startdate) 开始时间到结束时间相差几秒 example mysql > ...

seconds_diff description Syntax example keywords seconds_diff description Syntax INT seconds_diff(DATETIME enddate, DATETIME startdate) The difference between the start ...

Introduction to bee tool Installing bee tool bee tool commands Command new Command api Command run Command pack Command bale Command version Command generate Command migrat...

5.3 Model 5.3 Model Model是ActiveRecord中最重要的组件之一，它充当MVC模式中的Model部分。以下是Model定义示例代码： public class User extends Model < User > { public static final User da...