Tag:cascade

  • Spring MVC cascade attribute processing can not convert exception problem solving

    Time:2021-5-6

    This article mainly introduces the spring MVC cascade attribute processing can not be converted exception problem solving, this article through the example code is very detailed, for everyone’s study or work has a certain reference learning value, need friends can refer to Two things to note, 1. In the mapper XML file, the corresponding cascade […]

  • Share two recently encountered MySQL database bug cases

    Time:2021-5-3

    In the past month, when dealing with historical data problems, I encountered two MySQL bugs in a row. I’d like to share them with you, and you are welcome to point out if there is any problem. BUG1: Database version:  MySQL5.7.25 – 28 Operating system:CentOS 7.7 (not important) Database architecture: master slave cascade slave Database […]

  • Opencv Development Notes (55): red fat 8 minutes to take you in-depth understanding of Haar, LBP features and cascade classifier recognition process

    Time:2021-4-19

    If the article is original, it can’t be reproduced without permissionOriginal blog address: https://blog.csdn.net/qq21497936Original blog navigation: https://blog.csdn.net/qq21497936/article/details/102478062Blog address: https://blog.csdn.net/qq21497936/article/details/106144767Dear readers, knowledge is boundless and manpower is poor. Either change the demand, or find professionals, or do research on your ownRed fat man (red imitation) blog: development technology collection (including QT practical technology, raspberry pie, 3D, […]

  • What can. Net ORM navigation properties solve?

    Time:2021-4-18

    Write at the beginning From the earliest single table operation, Later, I contacted left join, right join and inner join queries, Because of the limited funds, we need to deal with the actual needs in multi table query. Do you have such experience? This paper explains the design idea of navigation attributes (manytoone, onetomany, manytomany) […]

  • Meet SQL (2)

    Time:2021-2-26

    SQL self study notes constraint 1.0 concept and classification   2.0 non NULL constraint   3.0 unique constraints   4.0 primary key constraints   Automatic growth     5.0 foreign key constraints   Cascade operation     Multi table relation Overview of three situations       Backup and restore of database     multi-table […]

  • Oracle delete table space and user

    Time:2021-2-7

    Log in as system user to find the user to be deleted: –Find users select  * from dba_users; –Find the path to the workspaceselect * from dba_data_files;    –Delete userDrop user user name cascade;–Delete table space and data fileDrop tablespace name including contents and datafiles cascade constraint;   For example, delete the user name as test, […]

  • How to use Select tag to cascade in JSP page

    Time:2021-2-7

    Do query page, query conditions are more often involved in the cascade. For a simple example, take the educational administration system as an example. We need to query the teaching plan information. The query criteria are enrollment batch, student level (from college to college), major and course. What is the cascading relationship between them?The enrollment […]

  • MySQL constraints

    Time:2021-1-16

    Concept: limit the data in the table to ensure the correctness, validity and integrity of the data. Classification: Primary key constraint: primary key Non NULL constraint: not null Unique constraint: unique Foreign key constraint: foreign key Non NULL constraint: not null, value cannot be null Add constraints when creating tables CREATE TABLE stu( id INT,Name […]

  • The war of microservices: cascading failures and avalanches

    Time:2020-10-29

    “The war of microservices” is a series of themes about the design of microservices. It is mainly aimed at some contradictions / conflicts after the microservice service, and does not involve a specific knowledge point. If you have any questions or suggestions, please feel free to exchange them. In the war of microservices: unification and […]

  • Two ways of spring cascading attribute assignment

    Time:2020-10-19

    This article mainly introduces the two ways of spring cascading attribute assignment analysis, the article introduces in detail through the example code, which has a certain reference learning value for everyone’s study or work, and friends in need can refer to it Car.java package com.gong.spring.beans; public class Car { private String name; public String getName() […]

  • Introduction and visit of k8s job

    Time:2020-10-15

    Job description Job is a kind of task type provided by k8s, which is responsible for batch processing of short live one-off tasks, that is, tasks executed only once. It ensures that one or more pods of batch tasks are successfully completed Three usage scenarios of job Non parallel tasks: only one pod is started. […]

  • What problems can. Net ORM navigation properties solve?

    Time:2020-10-1

    Write at the beginning From the earliest single table operations, Later, we contacted left join, right join and inner join queries, Because of the limited funds, it is necessary to deal with the actual needs in the multi table query. Do you have such experience? This paper explains the design ideas of navigation attributes (manytoone, […]