spring boot隔离级别READ_UNCOMMITTED不工作

spring.datasource.url=jdbc:mysql://localhost:3306/mydb?characterEncoding=utf8&useSSL=false&allowPublicKeyRetrieval=true&serverTimezone=Asia/Shanghai
spring.datasource.username=root
spring.datasource.password=123456
spring.datasource.driver-class-name=com.mysql.jdbc.Driver
spring.datasource.tomcat.default-auto-commit=false
spring.datasource.tomcat.initial-size=5
spring.datasource.tomcat.max-active=20
spring.datasource.tomcat.max-idle=10
spring.datasource.tomcat.min-idle=5
spring.datasource.tomcat.test-while-idle=true
spring.datasource.tomcat.test-on-borrow=false
spring.datasource.tomcat.validation-query=SELECT 1
spring.datasource.tomcat.validation-query-timeout=1
spring.jpa.database-platform=org.hibernate.dialect.MySQL5InnoDBDialect
spring.jpa.show-sql=true
spring.jpa.hibernate.ddl-auto=none
spring.jpa.properties.hibernate.format_sql=true

# 隔离级别配置
spring.jpa.properties.hibernate.connection.isolation=1