springboot连接数据库:
1.mybatis (注解版:一个sql语句只能查询一张表)
1.1 1 select * from t_user 2 select * from t_dept 通过java代码进行关联组成一个集合返回页面
2.1 注解版完成 单表增删改查
2.mysql
3.datasource:username password url driver
4.druid监控数据库
4.1 导入druid pom文件
<dependency>
<groupId>com.alibaba</groupId>
<artifactId>druid</artifactId>
<version>1.1.3</version>
</dependency>
4.2 配置数据库监控日志记录,将spring boot中log4j排除,并引入slf4j日志记录
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-web</artifactId>
<exclusions>
<exclusion>
<groupId>org.apache.logging.log4j</groupId>
<artifactId>log4j-to-slf4j</artifactId>
</exclusion>
</exclusions>
</dependency>
<dependency>
<groupId>org.slf4j</groupId>
<artifactId>slf4j-api</artifactId>
<version>1.7.25</version>
</dependency>
<dependency>
<groupId>org.slf4j</groupId>
<artifactId>log4j-over-slf4j</artifactId>
</dependency>
<dependency>
<groupId>org.slf4j</groupId>
<artifactId>jcl-over-slf4j</artifactId>
</dependency>
4.3 配置连接池属性
#配置数据源
spring.datasource.type=com.alibaba.druid.pool.DruidDataSource
spring.datasource.url=jdbc:mysql://localhost:3306/1806a?useUnicode=true&characterEncoding=utf8&useSSL=true&zeroDateTimeBehavior=convertToNull
spring.datasource.username=root
spring.datasource.password=root
spring.datasource.driver-class-name=com.mysql.jdbc.Driver
# 下面为连接池的补充设置,应用到上面所有数据源中
spring.datasource.initialSize=5
spring.datasource.minIdle=5
spring.datasource.maxActive=20
# 配置获取连接等待超时的时间
spring.datasource.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.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.minEvictableIdleTimeMillis=300000
spring.datasource.validationQuery=SELECT 1 FROM DUAL
spring.datasource.testWhileIdle=true
spring.datasource.testOnBorrow=false
spring.datasource.testOnReturn=false
# 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.filters=stat,wall,log4j
spring.datasource.logSlowSql=true
4.4 导入druid监控类DruidConfiguration,放在config包下
4.5 启动项目访问http://localhost:8080/druid/login.html
4.6druid常用属性解释:https://blog.csdn.net/deng11408205/article/details/79629183
4.7
https://www.cnblogs.com/liuchuanfeng/p/7002046.html
https://blog.csdn.net/moshowgame/article/details/80304198
5.页面thymeleaf页面模板引擎