Tag: select

BGP path selection-Next_Hop and MED experiment examples

1. Understanding attributes: Well-known mandatory: All BGP devices can recognize this type of attribute and must exist in Update messages. If such attributes are missing, the routing information will be incorrect. Well-known discretionary: All BGP devices can recognize this type of attribute, but it is not required to exist in the Update message. That is, […]

Python implementation selects data sets containing specified categories from the Labelme data set

Python implementation selects data sets containing specified categories from the Labelme data set Preface Prerequisites Related introduction lab environment Select data sets containing specified categories from the Labelme data set Code Output results Foreword Due to my limited level, errors and omissions will inevitably occur. Please criticize and correct me. For more exciting content, you […]

Multiplexing (Part 1) – select

Table of Contents 1. Select interface 1. Understand the select system call 2. Understanding of each parameter 2. Write select server 1. Two tool categories 2. Network socket encapsulation 3. Server class writing 4. Source file writing 5. Run 1. select interface 1. Understand the select system call int select(int nfds, fd_set readfds, fd_set writefds, […]

BGP path selection–AS_Path

AS_Path attribute The AS_Path attribute records all the AS numbers that a route passes through from the local to the destination address in vector order. When receiving a route, if the device finds that the AS number is in the AS_Path list, it will not receive the route, thus avoiding inter-AS routing loops. When the […]

BGP path selection–Preferred Value

BGP attributes Routing attributes are specific descriptions of routes. All BGP routing attributes can be divided into the following four categories. Common BGP attribute types are shown in Table 1: Well-known mandatory: All BGP devices can recognize this type of attribute and must exist in Update messages. If such attributes are missing, the routing information […]

Comprehensive selection of graduation project topics for data science and big data majors

Table of Contents Preface Topic selection Proposal guidance and suggestions More selected topics Topic selection help at last Foreword Hello everyone, this is the senior graduation project of Hailang! Senior year is the busiest time in the entire university. While you are busy preparing for postgraduate entrance examinations, public entrance examinations, teaching qualifications examinations or […]

MySQL error Expression #2 of SELECT list is not in GROUP BY clause and contains nonaggregated column solution

Error reason Using the GROUP BY statement violates sql_mode=only_full_group_by. In MySQL database version 5.7 or above, the ONLY_FULL_GROUP_BY SQL mode is enabled by default. In this mode, for the group by operation, if the query column in the select statement is not in the group by appears, then this SQL is illegal because the column […]

XML is associated with CSS, CSS attributes, floating positioning, and attribute selectors.

XML associated CSS 1) Call independent style files An independent css style file is a text file with the extension “.css”. XML must use preprocessing directives in order to use cascading style sheets. 2) Embed style statements into XML files Another way is to use the “style” attribute within the tag to define the style. […]

GoLong’s learning path (16) Basic tool GORM (operate database Mysql) (create database, insert data Insert and query data select))

GORM is similar to Mybatis in Java, which is great news for developers and supports mainstream databases. Article directory Install method 1 Method 2 Link to Mysql database Link existing database link Create table create Create a record with specified fields Batch insert Create hook Create based on Map Inquire Search based on primary key […]