Navigating a Data Hierarchy with Table Views 导航数据表视图层次 A common use of table views—and one to which they’re ideally suited—is to navigate hierarchies of data. A table view at a top level of the hierarchy lists categories of data at the most general l
Scenario Suppose we have a database table A, and then we create a CDS redirect view B for it, then every time the READ OPEN SQL is done on table A, ABAP kernel will direct this request to view B, and serve the request with content from B. Prerequisit
Collection View Basics Collection View 基础 To present its content onscreen, a collection view cooperates with many different objects. Some objects are custom and must be provided by your app. For example, your app must provide a data source object t
今天同事让我看一个触发器为什么老是报错,当执行DML语句触发触发器后,会报ORA-04091错误:ORA-04091: table xxxx is mutating, trigger/function may not see it .对应的中文错误提示为:ORA-04091: 表 xxx发生了变化, 触发器/函数不能读它. 原因分析: [oracle@DB-Server ~]$ oerr ora 409104091, 00000, "table %s.%s is mutating, trigge