Why is the JDBC driver not loaded

Loading drivers using Class.forName When using JDBC to connect to a database, the driver needs to be loaded first.You can declare the driver to load through Class.forName, which is not really clear here because Class.forName not only loads the class into memory, but also initializes it (the code in the static block is executed).The registration ...

Posted on Sat, 14 Dec 2019 02:08:00 -0800 by crazy_carl

How to connect HBase with Phoenix JDBC

I. introduce Mavan dependency <!-- https://mvnrepository.com/artifact/org.apache.phoenix/phoenix-core --> <dependency> <groupId>org.apache.phoenix</groupId> <artifactId>phoenix-core</artifactId> <version>4.14.0-HBase-1.3</version> </dependency> 2. Establish J ...

Posted on Fri, 13 Dec 2019 11:21:25 -0800 by god_zun

How simple is application.properties database sensitive information encryption?

Written in front As the saying goes: "customer is God", as a programmer, I sometimes directly meet the needs of customers. After all, I am on the side of providing services, so I will try my best to meet the temporary requirements. A few days ago, I had a need to meet vulnerability detection. I wanted to encrypt the plaintext sensitiv ...

Posted on Sat, 07 Dec 2019 14:01:19 -0800 by spider

jsp real jsp + jdbc login

jsp implementation of jsp + jdbc login Implementation ideas A form page, enter the user login and password, and then submit the information to the jsp page for verification. If the server can jump to the login success page, fail, jump to the error page When you jump, the URL of the window will change The code is as follows Write login code Logi ...

Posted on Thu, 05 Dec 2019 17:40:03 -0800 by transfield

SSM configuring multiple data sources to use annotations

Don't talk about it. Go straight to the code and configuration file 1. The name of the application-test-mysql.properties configuration file can be written with the type of properties (two data sources are MySQL and jdbc is orcale) jdbc.driver.class=com.mysql.jdbc.Driver jdbc.url=jdbc\:mysql\://localhost\:3306/xzcomp jdbc.user ...

Posted on Fri, 29 Nov 2019 21:04:48 -0800 by SpaceLincoln

Construction and basic use of hive environment

hadoop@vm2:~/apache-hive-0.14.0-bin$ ll total 400 drwxrwxr-x 8 hadoop hadoop 4096 Apr 16 04:45 ./ drwxr-xr-x 28 hadoop hadoop 4096 Apr 16 07:04 ../ drwxrwxr-x 3 hadoop hadoop 4096 Apr 16 04:45 bin/ drwxrwxr-x 2 hadoop hadoop 4096 Apr 16 07:02 conf/ drwxrwxr-x 4 hadoop hadoop 4096 Apr 16 04:45 examples/ drwxrwxr-x ...

Posted on Wed, 27 Nov 2019 12:35:35 -0800 by dr4296

Simple implementation of Dao design pattern

I. what is Dao design mode Dao design pattern encapsulates the details of operating the specific database and provides the interface of operating the database for the business layer. Therefore, it reduces the coupling between the business layer code and the specific database, facilitates the division of labor, and increases the portability of t ...

Posted on Tue, 26 Nov 2019 20:46:13 -0800 by jsimmons

Is it difficult to separate reading from writing?springboot with aop is easy to implement

Catalog Preface Environment Deployment Start Project Be careful Reference: Preface It's been a month since I joined the new company, I've finished the work at hand, and the last few days I finally have time to research the code for my old project.During the process of researching the ...

Posted on Tue, 26 Nov 2019 17:44:00 -0800 by intech

Java operating database -- manually implementing database connection pool

Absrtact: This paper mainly studies how to realize a database connection pool manually, and some improvements on this basis. Some of the content comes from the following Blogs: https://blog.csdn.net/soonfly/article/details/72731144 A simple database connection pool Connection pool tool class The connection pool uses thread safe queue to store c ...

Posted on Tue, 26 Nov 2019 03:44:18 -0800 by Rohan Hill

Spring Boot source code analysis - core capabilities of Spring Boot - integration of Mybatis

In this article, we integrate the orm framework of Mybatis in Spring boot. After all, we analyze the source code of its automatic configuration. Let's review how to integrate Mybatis in Spring. You can see my article. Mybaits source code analysis (10) --- spring mybatis framework use and source code analysis  Spring mybatis uses Add maven depen ...

Posted on Mon, 25 Nov 2019 19:42:11 -0800 by Option