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1. Grammar Break executable method saved on the database server for other developers to call It can effectively reduce the data interaction between database and server, improve efficiency and reduce bandwidth consumption Syntax format: declare -- define part, save variable, reference variable, record exception begin -- logical processing ...

  Django ORM multi table operation (Advanced)   1, Create model Next, we design the corresponding relationship between each table through the book management system. Through the relationship above, we can define our model class. from django.db import models class Book(models.Model): title = models.CharField(max_length= ...

MyBatis-XML Schema 1. Brief Description - Differences from Notes Execution efficiency: same Speed of development: faster annotations Easy maintenance: Notes are simpler. Old company, old projects still use XML     2. Environmental Setup 1. Make sure the database has been created 2. Import jar package & core configuration file ...

1, Date and time functions 1. Function to get the current dateIt's the same. It's different CURDATE(): used to get the current date of the systemCurrent "date() is used by the system to get the current date mysql> select CURDATE(),CURRENT_DATE(); 2. Get function of current time CURTIME(): used to get the current time of the system ...

1, Installation and release according to official instructions 2, New customized Models and controllers 1. Create a new database table (it is recommended to directly create a table in the database. If you want to try, you can also create a table in migrations. Please refer to the PHP artican command for details) 2. Create models through PHP ...

1, Summary One sentence summary: 1. The data migration of lavarel is relatively simple, which is to create data tables with php 2. Create migration file: PHP artican make: migration create? HD? Table -- create = HD 3. Create the migration file as a table: PHP artican migrate   1. Install barryvdh / laravel ide helper to add code prom ...

2020-03-29 20:00:27   1, Error message Recently, the project implementation colleagues upgraded the system and changed a field of test.test tab. The SQL statement is as follows: ALTER TABLE TEST.TEST_TAB_T1 MODIFY BXXX VARCHAR(200); After the system upgrade of the project, the MySQL master-slave synchronization er ...

One view atlas and the use of routing Using the view set ViewSet, you can place a series of logically related actions into a class: list() provides a set of data retrieve() provides a single data create() create data update() to save the data Destroy() delete data The ViewSet view set class no longer implements methods su ...

MySQL installation tutorial of Docker series With the previous basic tutorial Common command operation manual of Docker series After that, this blog records a mysql installation tutorial mysql image query command docker search mysql Several key parameters are explained as follows: INDEX docker.io is the official website of docker NAME the NA ...

Introduction Refer to the following article for the problem of Django2 connecting to MySQL and the solution of modifying the source code: The interaction between Django and MySQL However, there are many problems when the above source code modification method is used in the production environment. This article explains in detail how to solve thi ...