We know that the data types in Java and MySQL are different. In addition to the basic data types, there are also objects in Java.
Sometimes when using MySQL to store data or read data from MySQL, there are some special requirements, such as:
The Integer array is directly stored in MySQL and saved in the form of BLOB. When it is read out, it is ...
Posted on Thu, 14 Nov 2019 04:05:41 -0800 by ShadowX
Object Relational Mapping (ORM, or O/RM, or O/R mapping for short) is a kind of program technology, which is used to realize the conversion of data between different types of systems in object-oriented programming language. In effect, it creates a virtual object database which can be used in programming language.
Through OR ...
Posted on Tue, 12 Nov 2019 12:15:59 -0800 by ianr
Author: Gao PengAt the end of the article, there is his book "in-depth understanding of MySQL master-slave principle 32", in-depth understanding of MySQL master-slave, GTID related technical knowledge. This is a learning record. Please understand if there is any mistake.
This problem is a friend's @ situation, and this friend has rea ...
Posted on Tue, 12 Nov 2019 02:13:42 -0800 by imnsi
Small website structure
Note: if you deploy on the cloud, such as Alibaba cloud, you don't need to deploy keepalived yourself. Just buy the slb of Alibaba cloud, and then distribute the traffic to two haproxy machines
First, deploy two web servers
Compile and install nginx (script is rough)
[root@007-web2 ~]# cat nginx.sh
yum install -y vi ...
Posted on Tue, 12 Nov 2019 02:11:28 -0800 by ioop
Author: Gao Peng
At the end of the article, there is his book "in-depth understanding of MySQL master-slave principle 32", in-depth understanding of MySQL master-slave, GTID related technical knowledge. This is a learning record. Please understand if there is any mistake.
This problem was encountered by a friend @ Fengyun , and thi ...
Posted on Tue, 12 Nov 2019 02:01:45 -0800 by mars16
1. Principle of multi data switching: the core of multi data source dynamic switching is that the bottom layer of spring provides AbstractRoutingDataSource class for data source routing. We mainly inherit this class and implement the methods in it.
The main implementation method is: determineCurrentLookupKey(), which only needs to return the ...
Posted on Sun, 10 Nov 2019 09:02:12 -0800 by gauravupadhyaya
Starting from zabbix 3.4, zabbix has its own monitoring template for mysql, which is convenient for direct monitoring of mysql database on linux without any configuration. However, m is required for mysql database on windows, which cannot be directly monitored. After continuous inquiry, the monitoring method has been found, refer to https://bl ...
Posted on Sat, 09 Nov 2019 08:20:42 -0800 by babygodzilla
Spring Data JPA: Introduction:
Spring Data is the framework that spring provides operation database, and Spring Data JPA is just a module based on JPA standard operation database under Spring Data framework.
Spring Data JPA: operate on data based on JPA standard. Simplify the code of persistence layer, only need to wri ...
Posted on Fri, 08 Nov 2019 08:39:05 -0800 by theeper
The previous article introduced the installation of Docker tool and the use of common commands. In this article, we will introduce how to run MySQL instance in Docker. Some small partners may ask: why run MySQL in Docker? Because it is easy to deploy MySQL instance in Docker, it does not need to consider the dependency differences such ...
Posted on Thu, 07 Nov 2019 22:15:09 -0800 by syacoub
Multiple data source configuration is also a common development requirement. There are solutions for this in Spring and SpringBoot, but generally, if there is a need for multiple data sources, I would recommend that you prefer the distributed database middleware MyCat to solve the problem. A small partner asked questions on my knowledge planet ...
Posted on Thu, 07 Nov 2019 19:13:55 -0800 by LinuxForce