Pure white tutorial using Druid database connection pool in idea

1. download druid Related documents

Official download website https://repo1.maven.org/maven2/com/alibaba/druid/1.2.6/

Download these three jar After the document , Put three files in the same folder

Add : What is? jar file ?
In the field of software ,JAR file （Java file , English ：Java ARchive） Is a package file format , Usually used to aggregate a large number of Java Class file 、 Related metadata and resources （ Text 、 Pictures, etc ） File to a file , To distribute Java Platform applications or libraries .

2. stay idea Import druid and mysql

Left click druid-1.2.6jar file , Choose ,ctrl+c Key Copy .
With jdbc_demo Module as an example .
Right click jdbc_demo, Click New , Click on the table of contents , Name it lib, determine .

Left click lib Catalog

Press ctrl+v Realization Paste

Click ok

You can see this jar Documents and in lib Inside the folder .
then
Right click druid-1.2.6jar, Click Add to Library （ The last line ）

In the same way , take mysql-connector-java-8.0.29 Import and add to the Library
The premise is that you downloaded mysql 了 .
mysql Please search the tutorial separately for the installation configuration of .
Recommend a software ,everythingeverything Download address You can quickly find the desired file and get the location address

3. To configure

stay src New file in , Name it druid.properties
stay druid.properties Paste the following code into the file

#druid File configuration ,MySQL edition 8.0.29,druid edition 1.2.6//
driverClassName = com.mysql.cj.jdbc.Driver
# Fill in your own database name in the database name below ,password Fill in your own database password 
#url = jdbc:mysql://localhost:3306/ Database name ?useUnicode=true&characterEncoding=utf-8&userSSL=false&serverTimezone=GMT%2B8
url=jdbc:mysql://localhost:3306/datebase2?useUnicode=true&characterEncoding=UTF-8&useSSL=false&serverTimezone=Asia/Shanghai&zeroDateTimeBehavior=CONVERT_TO_NULL&allowPublicKeyRetrieval=true
username=root
password=*******
# Number of initial connections 
initialSize = 5
# maximum connection 
maxActive = 10
# Maximum timeout 
maxWait = 3000

complete