The data source module for Mybatis is located inOrg.apache.ibatis.datasource.
Common data source components are implementedJavax.sql.DataSourceInterface.Within Mybatis, third-party data source components are integrated, and data source implementations are provided.In general, data source initializat ...
Posted by sane993 on Wed, 17 Jun 2020 02:59:26 +0200
Mysqldump is a logical backup method. Its biggest defect is that the speed of backup and recovery is slow. For a database less than 50G, this speed is acceptable. But if the database is very large, it is not suitable to use mysqldump backup again. At this time, you need a kind of easy-to-use and efficient tool. Xtrabackup is one of them, known ...
Posted by motofzr1000 on Tue, 16 Jun 2020 10:20:51 +0200
How to install MySQL on Ubuntu 20.04
MySQL is the most popular open source relational database management system. It's fast, easy to use, easy to expand, and part of the popular LAMP and LEMP.
This guide explains how to install and protect MySQL on Ubuntu 20.04.
Make sure you are logged in as sudo user
Install MySQL on Ubuntu
At th ...
Posted by dorgon on Tue, 16 Jun 2020 08:57:06 +0200
Because an interface is too slow... Try to optimize (/ baldness)
Spring data used- mongo:2.1.3
mongo driver: 3.8.2
You can see me First query sentence.
Original page query
Due to the large amount of data, the query was slow, and it was later found that there was no need to use aggregation at all. With aggregate que ...
Posted by kat_jumper_33 on Tue, 16 Jun 2020 07:39:31 +0200
On Jetpack(1) - ViewModelOn Jetpack(2) - LifecyclesOn Jetpack(3) - LiveDataDemo project
Although Android carries SQLite, its operation is troublesome, and if it is a large-scale project, it will become confusing and difficult to maintain, unless you design a very good architecture and package.
Of cour ...
Posted by Runnion on Tue, 16 Jun 2020 05:22:09 +0200
Find the order status of the customer, which is displayed as: customer ID, company name, order ID, employee ID
where orders.CustomerID=customers.CustomerID and orders.ShipCity=customers.City
Posted by shortysbest on Tue, 16 Jun 2020 04:20:18 +0200
Ten suggestions for Java exception handling, I hope to help you ~
This article has been uploaded to github:
Public number: A little boy collecting snails
First, try not to use e.printStackTrace(), but to use log printing.
// do what you want
Posted by sheilam on Mon, 15 Jun 2020 18:07:36 +0200
J2WEB course design example
I found a good article about database query display error: Analysis of mysql coding errors.
And then I have a crack free version navicat . extraction code: dv6k
Project Name: xixijiaxiang online e-book City
Project background: (if I think about it myself, I won ...
Posted by brucensal on Mon, 15 Jun 2020 07:23:16 +0200
Implement delayed loading
Delay loading using allocation
Using Collection to delay loading
It is to load data when it is needed, and not to load data when it is not needed. Lazy loading is also called lazy loading
Advantages: query from single table first, ...
Posted by theDog on Sun, 14 Jun 2020 11:24:43 +0200
Introducing pagehelper dependency
application.yml Medium configuration
Test paging query interface
application.yml Configuration of pagehelper in
If you use mybatis to write paging query, it's troublesome. You need to write the select ...
Posted by dicamille on Sun, 14 Jun 2020 09:01:08 +0200