jsp to realize simple picture verification code (after login to realize the query database function)

1, Functional analysis of implementation (1) The function of adding the verification code on the landing page plays a certain security role. The login can be realized only when the correct verification code, user name and password are entered. (2) Realize the function of querying database. In the page ...

Posted on Sat, 22 Feb 2020 04:34:39 -0500 by exoduses

Detailed tutorial of Django connecting Mongodb (using mongoengine)

1, Understand MongoDB database? Introduction: MongoDB is written by C + + language. It is an open source database system based on distributed file storage. It is a document oriented database. It is JSON like data format, free and flexible. Advantages: scalable clustering, mass data storage, fast q ...

Posted on Sat, 22 Feb 2020 04:06:55 -0500 by liro

Getting started with Flask

Catalog 1, Architecture introduction 1. What is Flask? 2, Flask form operation 3, What is flask Sqlalchemy? 1. How to configure the database? 2. Define model 3. Model column type 4. Model column properties 5. Data query 6. Paging implementation 7. Flask migrate database migration 1. Model ...

Posted on Sat, 22 Feb 2020 02:50:54 -0500 by Nulletz

Inversion of control and dependency injection in Laravel source code analysis

concept Inversion of Control (IoC) is a design principle in object-oriented programming, which can be used to reduce the coupling between computer codes. It is a programming idea, which can let us design better programs. Dependency injection (DI) is a way to realize IOC. By this way, we can transf ...

Posted on Sat, 22 Feb 2020 01:38:45 -0500 by mickwaffle

[Emlog optimization] cache file optimization speed up article publishing speed up cache speed

Today, the webmaster of preferred resources continues to share the optimization of the Emlog website. How to speed up the caching speed of the website and the publishing speed of the articles? The previous article talked about a very rough method, which is simple and effective, but this is not in lin ...

Posted on Sat, 22 Feb 2020 00:22:31 -0500 by accident

Dynamic SQL for Mybatis Series

Contents of this Chapter Differences between #{} and ${} where and if usage of dynamic SQL Use of trim and if in dynamic SQL Use of SQL and include for dynamic SQL Use of select (when, otherwise) for dynamic SQL Use of foreach for dynamic SQL 1. #{} and ${} #{} should be a placeholder fo ...

Posted on Fri, 21 Feb 2020 23:00:16 -0500 by iamtheironman

Design Mode_Singleton Mode

An overview of the singleton pattern 1. Core: Ensure that a class has only one instance and provide a global access point to that instance. 2. Advantages of the singleton mode: 1) The performance overhead of the system is reduced because the singleton mode only produces one instance object.When th ...

Posted on Fri, 21 Feb 2020 21:04:40 -0500 by khurramijaz

#IT star is not a dream. Deploy MongoDB in Python

Case: using Python to deploy MongoDB Various standard libraries related to system management will be used in the case, including os, os.path, shutil, tarfile and subprocess modules. The download address of MongoDB is as follows: wget https://fastdl.mongodb.org/linux/mongodb-linux-s390x-rhel72-4.3.3.tgz Create a directory, pass in the MongoDB ...

Posted on Fri, 21 Feb 2020 09:18:54 -0500 by njwan

A simple addition, deletion, modification and query of sprigboot+jpa

Recently, I have taught myself some basic usage of springboot on mooc.com, and I have learned some relevant knowledge on the way to use it. Next, I will write down my learning achievements: This record is a simple addition, deletion, modification and query of mysql database using springboot+jpa. After a ...

Posted on Fri, 21 Feb 2020 05:03:10 -0500 by kyllerj

Hibernate learning crud operations on entity classes

Article directory 1 preliminary preparation 1.1 environment construction 1.2 create tool class to implement the creation of table 1.3 create test class 2 crud operation implementation 2.1 add 2.2 query by id 2.3 amendment 2.4 delete 1 preliminary preparation 1.1 environment construction se ...

Posted on Fri, 21 Feb 2020 03:08:11 -0500 by ginoitalo