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[帮助文档] DataphinJava代码调用数据服务API报错ColumnsAuthCheckFailed:XXX"

问题描述Dataphin Java代码调用数据服务API报错“Columns Auth Check Failed: XXX"。问题原因Java代码编辑错误，数据服务API没有该返回值。解决方案修改Java代码，去掉不存在的数据服务API返回值即可。适用于Dataphin数据服务API

[帮助文档] DataphinJava代码调用数据服务API报错APInotfoundwith`POST/get/XXX`"

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[帮助文档] Dataphin如何解决数据源查询逻辑表数据,运行报错java.sql.SQLException:executeerror:Tableforbidden

问题描述Dataphin 通过SDK代码调用“服务”模块发布的“Dataphin数据源”查询逻辑表数据，运行报错“java.sql.SQLException:execute error: Table forbidden”问题原因SQL语句中没有带业务板块导致。解决方案修改SDK代码，SQL语句中加上...

Java架构师教你写代码（二） - 使用建造者替代多参数的构造器（下）

4 建造者模式适于类层次结构使用构建器的平行层次结构，每个构建器都嵌套在相应类中。抽象类有抽象类构建器；具体类有具体类构建器。4.1 实例类继承结构中处于最底端的抽象类：各种比萨：BasePizza.Builder 泛型类型，有个递归类型的参数。和抽象的 self 方法一起，允许在子类中适当地进行方...

Java架构师教你写代码（二） - 使用建造者替代多参数的构造器（上）

静态工厂和构造器的局限：对于大量可选参数情况，难以做到很好的扩展。比如一个类，表示包装食品上的营养标签。有些字段是必需的：净含量、毛重和每单位份量的卡路里，还有 20 个可选字段，如：总脂肪、饱和脂肪、反式脂肪、胆固醇、钠…大多食品只使用可选字段中的少数，且非零值。这样的类怎么编写构造...

Java架构师教你写代码（一） - 使用静态工厂方法（简单工厂）替代构造器（下）

2.2 无需在每次调用时创建新对象这使得不可变类使用事先构造好的实例，或在构造实例时缓存实例，重复分配以避免创建不必要的重复对象。Boolean.valueOf(boolean) 方法：它从不创建对象。Boolean类中该方法将 boolean 基本类型值转换为一个 Boolean 对象引用返回一个...

Java架构师教你写代码（一） - 使用静态工厂方法（简单工厂）替代构造器（中）

logback 应用JDBC实例返回值是一个抽象类，必有一子类实现这其中URLStreamHandler就相当于各种抽象产品,而其实现类即各种具体的产品URLStreamHandlerFactory就相当于 VideoFactory而如下 Factory 就相当于如 JavaVideoFactory...

Java架构师教你写代码（一） - 使用静态工厂方法（简单工厂）替代构造器（上）

1 简单工厂定义由一个工厂对象决定创建出哪一种产品类的实例类型创建型，但不属于GOF23种设计模式官方定义Define an interface for creating an object,but let subclasses decide which class to instantiate.F...

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