spring.datasource.type=com.alibaba.druid.pool.DruidDataSource
spring.datasource.driver-class-name=com.mysql.cj.jdbc.Driver
spring.datasource.url=jdbc:mysql://localhost:3306/zhangziyangtest?serverTimezone=Asia/Shanghai&characterEncoding=utf8
spring.datasource.username=root
spring.datasource.password=root

初始化druid连接池的连接数量 大小，最小，最大

spring.datasource.druid.initialSize=5
spring.datasource.druid.minIdle=5
spring.datasource.druid.maxActive=20

配置获取连接等待超时的时间

spring.datasource.druid.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

spring.datasource.druid.timeBetweenEvictionRunsMillis=60000

配置一个连接在池中最小生存的时间，单位是毫秒

spring.datasource.druid.minEvictableIdleTimeMillis=300000
spring.datasource.druid.validationQuery=SELECT 1 FROM DUAL
spring.datasource.druid.testWhileIdle=true
spring.datasource.druid.testOnBorrow=false
spring.datasource.druid.testOnReturn=false

是否缓存preparedStatement，也就是PSCache 官方建议MySQL下建议关闭 个人建议如果想用SQL防火墙 建议打开

spring.datasource.druid.poolPreparedStatements=true
spring.datasource.druid.maxPoolPreparedStatementPerConnectionSize=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

spring.datasource.druid.filters=stat,wall,log4j

通过connectProperties属性来打开mergeSql功能；慢SQL记录

spring.datasource.druid.connectionProperties=druid.stat.mergeSql=true;druid.stat.slowSqlMillis=5000

！！！请勿配置timeBetweenLogStatsMillis 会定时输出日志 并导致统计的sql清零

spring.datasource.druid.timeBetweenLogStatsMillis=20000

mybatisdao位置+Bean位置
mybatis.mapper-locations=classpath:mapper/.xml

mybatis.type-aliases-package=com.springboot.demo.bean

分页插件pagehelper配置

pagehelper.page-size-zero=true
pagehelper.offset-as-page-num=true
pagehelper.row-bounds-with-count=true
pagehelper.reasonable=true
pagehelper.params=pageNum=pageHelperStart;pageSize=pageHelperRows;
pagehelper.support-methods-arguments=false
pagehelper.helper-dialect=mysql

springboot + mybatis + pagehelper + druid + mysql

原文：https://www.cnblogs.com/ZhangZiYangDeBoKe/p/11281694.html