Spring Boot Tutorial (7): Spring Boot integrates druid connection pool

1. Project preparation

Directly use the source code of the previous chapter, Spring Boot Tutorial (6): Spring Boot integrates mybatis

2. Add druid dependencies

<!-- druid -->
<dependency>
    <groupId>com.alibaba</groupId>
    <artifactId>druid-spring-boot-starter</artifactId>
    <version>1.1.9</version>
</dependency>

3. Data source configuration

Add druid configuration to the application.propertiesconfiguration file

## 数据源配置
#spring.datasource.url=jdbc:mysql://localhost:3306/springboot?useUnicode=true&characterEncoding=utf-8&useSSL=false
#spring.datasource.username=root
#spring.datasource.password=root
#spring.datasource.driver-class-name=com.mysql.jdbc.Driver

# 这4个参数key里不带druid也可以，即可以还用上面的这个4个参数
spring.datasource.druid.url=jdbc:mysql://localhost:3306/springboot?useUnicode=true&characterEncoding=utf-8&useSSL=false
spring.datasource.druid.username=root
spring.datasource.druid.password=root
spring.datasource.druid.driver-class-name=com.mysql.jdbc.Driver

# 初始化时建立物理连接的个数
spring.datasource.druid.initial-size=5
# 最大连接池数量
spring.datasource.druid.max-active=30
# 最小连接池数量
spring.datasource.druid.min-idle=5
# 获取连接时最大等待时间，单位毫秒
spring.datasource.druid.max-wait=60000
# 配置间隔多久才进行一次检测，检测需要关闭的空闲连接，单位是毫秒
spring.datasource.druid.time-between-eviction-runs-millis=60000
# 连接保持空闲而不被驱逐的最小时间
spring.datasource.druid.min-evictable-idle-time-millis=300000
# 用来检测连接是否有效的sql，要求是一个查询语句
spring.datasource.druid.validation-query=SELECT 1 FROM DUAL
# 建议配置为true，不影响性能，并且保证安全性。申请连接的时候检测，如果空闲时间大于timeBetweenEvictionRunsMillis，执行validationQuery检测连接是否有效。
spring.datasource.druid.test-while-idle=true
# 申请连接时执行validationQuery检测连接是否有效，做了这个配置会降低性能。
spring.datasource.druid.test-on-borrow=false
# 归还连接时执行validationQuery检测连接是否有效，做了这个配置会降低性能。
spring.datasource.druid.test-on-return=false
# 是否缓存preparedStatement，也就是PSCache。PSCache对支持游标的数据库性能提升巨大，比如说oracle。在mysql下建议关闭。
spring.datasource.druid.pool-prepared-statements=true
# 要启用PSCache，必须配置大于0，当大于0时，poolPreparedStatements自动触发修改为true。
spring.datasource.druid.max-pool-prepared-statement-per-connection-size=50
# 配置监控统计拦截的filters，去掉后监控界面sql无法统计
spring.datasource.druid.filters=stat,wall
# 通过connectProperties属性来打开mergeSql功能；慢SQL记录
spring.datasource.druid.connection-properties=druid.stat.mergeSql=true;druid.stat.slowSqlMillis=500
# 合并多个DruidDataSource的监控数据
spring.datasource.druid.use-global-data-source-stat=true

4. Test

Start the service, enter the browser, http://localhost:8080/usersand the interface is as follows:

Browser input http://localhost:8080/druid, the interface is as follows:

Open the sql window of the mysql client navicat, execute show full processlistit, and display the following content:

As you can see, after starting the project, 5 data connections are created directly, which are controlled by the application.propertiesconfiguration file spring.datasource.druid.initial-size=5.

Five, druid monitoring

In step 4, we can see that the druid console interface can be seen directly by the browser input http://localhost:8080/druid, where you can see a lot of project information. It is very dangerous if you let the user access it at will. We can configure it, and the settings can only be accessed through login authentication.

Add to the application.propertiesconfiguration file:

# druid连接池监控
spring.datasource.druid.stat-view-servlet.login-username=admin
spring.datasource.druid.stat-view-servlet.login-password=123
# 排除一些静态资源，以提高效率
spring.datasource.druid.web-stat-filter.exclusions=*.js,*.gif,*.jpg,*.png,*.css,*.ico,/druid/*

You only need to configure the user name and password. After restarting the server, you need to log in to access it again. Browser input http://localhost:8080/druid, the interface is as follows: Enter the user name and password

configured in the configuration file just now , and you can access it normally after logging in.admin123

Source code:
github
code cloud