JSON Support Querying nested collection Example 1: Unnesting a nested collection Example 2: Unnesting in existential subquery JSON Support SQL plugin supports JSON by followi...

Optionals Introduction Problem Implicit and Explicit Type Rules Fetching Profile Picture Introduction to Optionals Optionals Rules Optionals Unwrapping Forced Unwrapping Im...

One to many relation Inner joins Left outer join Grouping and counting One to many relation To illustrate how to implement one to many relations with the DAL, define another...

struct类型 struct类型的声明 struct 的匿名字段 struct类型 struct类型的声明 Go语言中，也和C或者其他语言一样，可以声明新的类型，作为其它类型的属性或字段的容器。例如，可以创建一个自定义类型person 代表一个人的实体。这个实体拥有属性：姓名和年龄。这样的类型称之struct 。如下代码所示: type pe...

Storing data Storing data Let’s begin by populating the database with some people. We will use the save() and create() methods to add and update people’s records. from da...

Storing data Storing data Let’s begin by populating the database with some people. We will use the save() and create() methods to add and update people’s records. from da...

Functions Introduction Functions Function Types Typing the function Writing the function type Inferring the types Optional and Default Parameters Rest Parameters this this...

乐观事务和悲观事务 悲观事务 1. 编写悲观事务示例 2. 运行不涉及超卖的例子 3. 运行防止超卖的例子 乐观事务 1. 编写乐观事务示例 2. 运行不涉及超卖的例子 3. 运行防止超卖的例子 乐观事务和悲观事务 简单的讲，乐观事务 模型就是直接提交，遇到冲突就回滚，悲观事务 模型就是在真正提交事务前，先尝试对需要修改的资源上锁，只有...

{append} Note {append} {append} 可以在 运行时 为数组变量增加或者创建值。 Note 这需要考虑的是，对于模板中变量的赋值，最好尽量是放到PHP程序代码中进行。 属性: 参数名称 类型 必选参数 默认值 说明 var string Yes n/a 赋值的变量名称 ...

Protocol Extension and Type Constraints Introduction Problem Generic Function - Review Design Protocol Design Protocol Extension Design Pre-Defined Associated Type Source Co...