Quick learn - MyBatis map file

Chapter 4 MyBatis mapping file 4.1 introduction to mybatis mapping file The real power of MyBatis lies in its mapping statement and its magic. Because of its extraordinary power, the XML file of mapper is relatively simple. If you compare it with JDBC code with the same function, you will immediate ...

Posted by wtg21.org on Mon, 10 Feb 2020 04:20:58 -0800

[MySQL] performance ﹣ schema Library of MySQL

MySQL comes with four databases, which are: information_schema performance_schema mysql test This article introduces the performance ﹣ schema library. Sketch Performance schema library is a new storage engine in MySQL 5.5. It is mainly used to collect database server performance parameters, monitor ...

Posted by tanju on Mon, 10 Feb 2020 03:27:39 -0800

MyBatis delay load (lazy load) Introduction

MyBatis delayed loading Introduction In the previous article, multi table query is introduced. In practice, we often involve multi table joint query, but sometimes, not all query results will be used immediately. Let me give two examples: For example, to query the purchase details of a batch of notebook computers, instead of directly displayi ...

Posted by kkeim on Mon, 10 Feb 2020 02:50:54 -0800

[Python reptile actual combat] statistics of OJ test record statistics of Codeforces test record

Article directory 1, Demand analysis 2, Specific implementation 3, Full code I don't know if other people will do this. Anyway, as an Acmer who has been in the pit for more than one year, sometimes I want to know how many problems I have written. Of course, I can go to OJ for one problem, but it's ...

Posted by 87dave87 on Sun, 09 Feb 2020 23:09:09 -0800

How to use CouchDB wallet in Fabric Node SDK

When an application interacts with a Hyperledger Fabric network, the Fabric node first verifies the identity of the application, that is, whether the certificate held by the application allows access to the Hyperledger Fabric network.In Hyperledger, these identities are stored in the wallet.In this tutorial, we will show you how to use a CouchD ...

Posted by andrewgarn on Sun, 09 Feb 2020 20:49:30 -0800

In a word, the essence of MYSQL optimization

This article has more points of knowledge and a longer length of text, please be patient to learn MySQL has become the backbone of relational database products nowadays, and is favored by Internet companies. Out-of-office interviews want BAT, high salary, no knowledge of MySQL optimization, and the ...

Posted by doug007 on Sun, 09 Feb 2020 19:59:13 -0800

Back end interaction

First step (1) Form login settings and form validation   1> Set click event - > get the password value of the account entered in the form - > use regular expression to verify the form - > send ajax request - > enter the background - > Import configuration file - > receive the data sent by ajax - &gt ...

Posted by debigmac on Sun, 09 Feb 2020 12:00:16 -0800

SQL injection filter for WebApi

Development tools: Visual Studio 2017 C × version: C × 7.1 The most effective way to prevent SQL injection is to use parameterized queries when invoking the database. But if you are taking over an old WebApi project and don't want to change the code of many database access layers, how to do it. My solution is to add a filter. Write ...

Posted by njm on Sun, 09 Feb 2020 10:56:35 -0800

MySQL basic learning (4) -- JAVA application based on MySQL

Requirement: Based on MYSQL, implement the last Zheng code query java program implemented with SQLite and improve it: input aacm, then output "no comment". When a Chinese character or a Chinese character word is input, the Zheng code code of that character or word is output. 1. Set up Zheng code table in MySQL databa ...

Posted by ramesh_iridium on Sun, 09 Feb 2020 09:53:12 -0800

Simple login case

preparation: Import the required jar package, import it into the lib package under the web directory and WEB-INF directory, and add it into the module The following picture:Configuration database file druid.properties driverClassName=com.mysql.cj.jdbc.Driver url=jdbc:mysql:///Day14 you can create your o ...

Posted by Lukey on Sun, 09 Feb 2020 07:52:08 -0800