Add and query data table with object-oriented idea, JDBC code is super detailed

In this paper, the JDBC program is written with the object-oriented idea, and the java program is used to add the student information to the data table, and the student information can be queried by given ID card number or by given examination number. The created data table is as follows: CREATE TABLE EXAMSTUDENT( FlowID INTEGER, Type ...

Posted on Tue, 03 Dec 2019 19:19:41 -0500 by rbastien

Three states of Hibernate object

hibernate has three states: Transient, persistent, detached The following figure shows the state transition of objects in hibernate: Example 1 @Test public void Test12() { Configuration cfg = new Configuration().configure();//Get configuration SessionFactory sessionFactory = cfg.buildSessionFactory();//Create session factor ...

Posted on Tue, 03 Dec 2019 17:08:34 -0500 by stiphu

Navicat tool and pymysql module of mysql

1. Introduction to ide tools (Navicat) In order to facilitate the test, use the IDE tool, Navicat, which is essentially a socket client, a visual tool for connecting mysql server, and a graphical interface version. The difference between it and using the command line directly is similar to the difference between linux and windows. Navicat downl ...

Posted on Tue, 03 Dec 2019 13:07:45 -0500 by 9902468

Oracle column rollover function use

I. business scenario Today, we need to implement a table with a column of effects: user name a (account a), user name B (account b)... This format. This brings us to VM concat, oracle's column conversion function.You can use the format wm|concat (a | '(' |; b | ')'), where a represents the user name field and b represents the accou ...

Posted on Tue, 03 Dec 2019 08:58:14 -0500 by NoPHPPhD

[Mybatis] - configuration initialization process

Mybatis configuration initialization process Test code SqlMapConfig.xml <?xml version="1.0" encoding="utf-8"?> <!DOCTYPE configuration PUBLIC "-//mybatis.org//DTD Config 3.0//EN" "http://mybatis.org/dtd/mybatis-3-config.dtd"> <configuration> <properties resource="db.properties"/> <typeAliases> ...

Posted on Tue, 03 Dec 2019 06:29:11 -0500 by beckstei

The way programmers are technologically transformed Handwritten MyBatis framework

The core functionality of the MyBatis framework is not difficult, it's all about dynamic proxy and jdbc operations, it's hard to write code that is scalable, highly cohesive, and less coupled. The Mybatis function completed in this paper is relatively simple, and there are many areas of code that need to be improved. You can combine Mybatis so ...

Posted on Tue, 03 Dec 2019 06:00:18 -0500 by atyndall

MySQL omissions in software test learning

function -- function -- Empty operation select trim(' ss '); -- Rounding select round(-1.5); -- The result is-2 select round(1.5); -- The result is 2 -- Get 0 at random-10 Integer select round(rand()*10); -- Randomly take records from a table select *,rand() from student order by rand() limit 1; -- select Medium ...

Posted on Tue, 03 Dec 2019 05:54:44 -0500 by hesyar

The implementation of registration function in Java Web

Implementation of registration function Experimental steps 1. Create the database mydb with the character code of utf-8. 2. Create a tb_user table in the mydb database. The structure of the table is as follows: 3. Import the project of Experiment 1 in eclipse. The project structure after import is as follows: 4. Copy the reg ...

Posted on Tue, 03 Dec 2019 04:47:03 -0500 by iceraider

Python automatic operation and maintenance development: basic Mysql Database Paging and paging in Python code

Back end database paging is implemented according to limit The first writing method: limit the number of pages offset start position select id,name,sex,tel,addr from user limit 1 offset 1; select * from student limit pageSize offset (pageNumber-1)*pageSize The second writing method: limit starting position, number of pages select id,name from ...

Posted on Mon, 02 Dec 2019 19:23:45 -0500 by kh411dz

Troubleshooting of Oracle with high resource consumption but execution = 0

During the daily inspection of a customer's production environment database, it was found that the AWR report had a high resource consumption but execution = 0This phenomenon can be explained as that SQL does not complete once in this one hour snapshot cycle.(1)For the first article SQLID=1cc0y3fyndjcv UPDATE User1.Tab1 A SET (col1, col2, col3, ...

Posted on Mon, 02 Dec 2019 17:25:14 -0500 by Domestics