When using limit paging query, do delete operation, which will result in data loss
1, Prepare data
1.1 mysql data script
1. All data before verification
2. Data on the first page
3. Delete records
4. Add record
5. Data on the second page
6. Data after verification
Four, suggesti ...
Posted on Wed, 15 Apr 2020 09:18:15 -0700 by roadkillguy
Druid is Alibaba's open-source database connection pool. As a rising star, Druid has higher performance than dbcp and c3p0, and is used more and more widely.
High performance. The performance is much higher than dbcp and c3p0.
As long as it is a database supported by jdbc, Druid supports it and has good su ...
Posted on Sun, 29 Mar 2020 07:58:17 -0700 by gowni
The project uses spring boot + jpa + druid, and LOG is logback. druid does not print SQL content befor ...
Posted on Fri, 20 Mar 2020 07:54:14 -0700 by linuxdoniv
In the quick start, we demonstrated how to access local sample data, but Druid actually supports very rich data access methods.Such as batch data access and real-time streaming data access.In this paper, we will introduce these data access methods.
File Data Access: Loading batch data from a file
Accessing stream data from Kafka: Loading st ...
Posted on Mon, 16 Mar 2020 19:16:01 -0700 by shavas
Case: user login
User login case requirements:
1. Write two input boxes of login.html login page username & password
2. use the Druid database connection pool technology to operate the user table in the mysql and day14 databases
3. Using JdbcTemplate technology to encapsulate JDBC
4. Log in succ ...
Posted on Tue, 11 Feb 2020 08:50:12 -0800 by Supernovas
3. Online learning interface3.1 demand analysisAccording to the business process below, this chapter completes the front-end learning page to request the learning service to obtain the course video address, and automatically plays the video. 3.2 build development environment3.2.1 create databaseCreat ...
Posted on Fri, 07 Feb 2020 07:37:38 -0800 by if
Why use a database connection pool
Do not use database connection pools: For sites with high concurrency, this can cause the following problems:
Every web request establishes a database connection, reusing system resources in the same steps
Unable to control the number of connection objects created, sy ...
Posted on Sun, 26 Jan 2020 17:23:07 -0800 by heepofajeep
There are several problems
1) The existence of hard coding (username and password, url and classnameDriver) will be changed at any time
2) Just load the class file once, and load the file every time
3) The connection object needs to be created every time it queries, which is a waste of resources
4) Close resource code is lo ...
Posted on Sun, 05 Jan 2020 21:41:27 -0800 by badboy1245
Master and slave data source configuration
Data source configuration of sub database and sub table
Using dynamic data source and AOP to realize sub database
1. Configure multiple data sources in the application.yml file
date-format: yyyy-MM-dd HH:mm:ss
Posted on Thu, 19 Dec 2019 07:17:53 -0800 by my800stuff
I. technical parameters:
Database connection pool: druid
Project pom file:
<?xml version="1.0" encoding="UTF-8"?>
<project xmlns="http://maven.apache.org/POM/4.0.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
Posted on Mon, 02 Dec 2019 20:29:56 -0800 by DaPrince