注意：如果我们使用spring-boot-starter-jdbc 或 spring-boot-starter-data-jpa “starters”坐标,Spring Boot将自动配置HikariCP连接池，

因为HikariCP在性能和并发性相比其他连接池都要好。

org.springframework.bootspring-boot-starter-jdbc

一、默认连接池策略

1.如果可以得到HikariCP连接池类，就优先配置HikariCP

2.否则，如果Tomcat pooling类可以得到，则使用它

3.如果上面两个都拿不到，则配置其他连接池，比如Commons DBCP2

spring.datasource.url=jdbc:mysql://localhost/test
spring.datasource.username=dbuser
spring.datasource.password=dbpass
spring.datasource.driver-class-name=com.mysql.jdbc.Driver

yml文件：

复制代码
spring:
datasource:
url: jdbc:mysql://localhost:3306/heimdallr?useUnicode=true&characterEncoding=utf8&allowMultiQueries=true
username: root
password: 123
driver-class-name: com.mysql.jdbc.Driver

Spring Boot官方推荐的数据库连接池是Hikari，从一些第三方的评测结果看，Hikari的性能比Druid要好，但是Druid自带各种监控工具，背后又有阿里一直在为它背书

hikari数据源配置，

hikari:connection-test-query: SELECT 1 FROM DUALconnection-timeout: 30000maximum-pool-size: 20max-lifetime: 1800000minimum-idle: 5

复制代码

二、自己指定连接池

通过设置spring.datasource.type属性，可以跳过默认连接池选择策略，比如指定druid连接池

下面为连接池的补充设置，应用到上面所有数据源中

初始化大小，最小，最大

max-idle: 10
max-wait: 1000
min-idle: 5
initial-size: 5
output.ansi.enabled: always

配置druid

druid:

配置获取连接等待超时的时间

  maxWait: 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

  timeBetweenEvictionRunsMillis: 60000minEvictableIdleTimeMillis: 300000validationQuery: SELECT 1 FROM t_usertestWhileIdle: truetestOnBorrow: truetestOnReturn: false

打开PSCache，并且指定每个连接上PSCache的大小

  poolPreparedStatements: truemaxPoolPreparedStatementPerConnectionSize: 20

配置监控统计拦截的filters，去掉后监控界面sql无法统计，'wall’用于防火墙

  filters: stat,wall,log4jconnectionProperties: druid.stat.mergeSql=true;druid.stat.slowSqlMillis=5000

合并多个DruidDataSource的监控数据

useGlobalDataSourceStat: true

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