我对Firebird不是很熟悉,也许有人可以给我讲讲一些基础知识。
我有一个相当简单的查询
SELECT *
FROM "PREORDER"
WHERE COLLECTED = 'N'
AND MOST_RECENT = 'Y'
我想选择所有收集到的布尔值在N上并且是最近的元素。但我也希望选择收集到的且客户编号不等于零的所有元素。如下所示:
SELECT *
FROM "PREORDER"
WHERE ( COLLECTED = 'N' OR (COLLECTED = 'Y' AND (CUSTOM
我正在研究快速编程语言,目前的主题是garbige
class Person{
var firstName: String
var lastName: String
init(firstName: String, lastName: String){
self.firstName = firstName
self.lastName = lastName
}
deinit{
print("\(firstName) \(lastName) is being removed from momory!
我正在处理一个EF数据类集,其中一个类在属性上相当大。然而,许多属性可以被分组到子类别中,我想这样做是为了帮助清楚。它也被开发为“代码优先”。
例如,对于雇员,以下内容是在EF中实现的。
Public Class Employee
Public Overridable Property ID As Integer
Public Overridable Property Surname as String
Public Overridable Property FirstName as String
Public Overridable property Age