榜单
服务器优惠
AI论文
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while
while Checking the condition at the end of a loop As an expression while A while executes its body as long as its condition is truthy. while some_condition do_this en... -
while
while Checking the condition at the end of a loop As an expression while A while executes its body as long as its condition is truthy. while some_condition do_this en... -
while
while Checking the condition at the end of a loop As an expression while A while executes its body as long as its condition is truthy. while some_condition do_this en... -
模型
自由地引入不是 ActiveRecord 的模型类。 模型的命名应有意义（但简短）且不含缩写。 如果需要模型类有与 ActiveRecord 类似的行为（如验证），但又不想有 ActiveRecord 的数据库功能，应使用 ActiveAttr 这个 gem。 class Message include ActiveAttr ::... -
The Program
The Program Main code The Program The program is a global object in which you can define types, methods and file-local variables. # Defines a method in the program def add... -
The Program
The Program Main code The Program The program is a global object in which you can define types, methods and file-local variables. # Defines a method in the program def add ... -
The Program
The Program Main code The Program The program is a global object in which you can define types, methods and file-local variables. # Defines a method in the program def add... -
Type inference
Type inference With type restrictions Without type restrictions 1. Assigning a literal value 2. Assigning the result of invoking the class method new 3. Assigning a variable th... -
sql trace
SQL TRACE能够交互式的提供上一次执行的SQL请求执行过程信息及各阶段的耗时。 sql trace开关 sql trace功能默认时关闭的，可通过session变量来控制其关闭和打开； set ob_enable_trace_log = 0 / 1 ; show trace 当sql trace功能打开后，执行需要诊断的SQ... -
Has Many
Setup Basic usage Add and Remove Querying Also known as one-to-many, is an association between a single entity (Author ) and a collection of many other linked entities (Book ...