nested set

The nested class is defined in the class. Classes with embedded classes are called external classes. According to the "deep understanding of Nested classes and internal classes", the nested classes are classified into static nesting classes and

Special tools and techniques--Nested classesThere is the ability to define a class within a class, which is nested classes, also known as nested types, unlike the local classes described later . Nested classes are most often used to define run

Special tools and techniques--Nested classesYou can define a class inside another class (unlike the local class described later , in which a nested class is inside a class ) , such that a class is a nested class, also known as a nested type. Nested

To create a variable-length array type This variable length array can hold up to two data, the type of the data is VARCHAR2 (50) Change the size or precision of an element type You can change the size of long array types and nested

I. Nested loop principleNested loop connection (loop nested connection) refers to a two-table connection, which is followed by a two-tier nested loop to match sequentially, and finally gets the table join method that returns the result set.If the

1. What is a nested type: a type defined inside a class and struct is called a nested type, for example1 class Container 2 {3 class Nested 4 {5 Nested () {}6 }7 }2. Whether the external type is a struct or a class. Nested type

 Error Handling of nested transactions and transaction retention points     For nested transactions.1. Start external transactions, start internal transactions, and try catchInternal error: if an internal transaction error occurs, internal and

Source from: http://hwhuang.javaeye.com/blog/650903 KeywordsConcepts of nested transactions and autonomous transactionsUse of nested transactionsUse of autonomous transactions1. Concepts1. nested transaction ):It refers to one or more sub

Database Table design. It is not best to have only the most suitable (adjacent table, Path Enumeration, nested set, closure table), enumeration packet tableWhen designing a database, do we break through the general rules and find the most suitable

Take a closer look at other functions of the Oracle nested table and make a simple arrangement. Oracle provides two methods to use nested tables:1. PL/SQL code is used as the extended PL/SQL language. (This section describes the oracle memory table