SpringBoot整合Druid和mybatis-plus
Druid简介
Java程序很大一部分要操作数据库，为了提高性能操作数据库的时候，又不得不使用数据库连接池。
Druid 是阿里巴巴开源平台上一个数据库连接池实现，结合了 C3P0、DBCP 等 DB 池的优点，同时加入了日志监控。
Druid 可以很好的监控 DB 池连接和 SQL 的执行情况，天生就是针对监控而生的 DB 连接池。
Druid已经在阿里巴巴部署了超过600个应用，经过一年多生产环境大规模部署的严苛考验。
Spring Boot 2.0 以上默认使用 Hikari 数据源，可以说 Hikari 与 Driud 都是当前 Java Web 上最优秀的数据源，我们来重点介绍 Spring Boot 如何集成 Druid 数据源，如何实现数据库监控。
pom.xml
<!--数据库驱动-->
<dependency>
<groupId>mysql</groupId>
<artifactId>mysql-connector-java</artifactId>
<scope>runtime</scope>
</dependency>
<!--lombok-->
<dependency>
<groupId>org.projectlombok</groupId>
<artifactId>lombok</artifactId>
<optional>true</optional>
</dependency>
<!--mybatis-plus-->
<dependency>
<groupId>com.baomidou</groupId>
<artifactId>mybatis-plus-boot-starter</artifactId>
<version>3.0.5</version>
</dependency>
<!-- druid -->
<!--引入druid数据源-->
<!-- https://mvnrepository.com/artifact/com.alibaba/druid -->
<dependency>
<groupId>com.alibaba</groupId>
<artifactId>druid</artifactId>
<version>1.1.21</version>
</dependency>
<dependency>
<groupId>log4j</groupId>
<artifactId>log4j</artifactId>
<version>1.2.17</version>
</dependency>application.yml
#服务的名称
spring:
application:
name: product-service
########-spring datasource-########
datasource:
#账号配置
url: jdbc:mysql://bt.jfgapp.com:3306/springcould?useSSL=true&useUnicode=true&characterEncoding=utf-8&serverTimezone=UTC
username: springcould
password: springcould@
driver-class-name: com.mysql.cj.jdbc.Driver
#druid连接池配置
type: com.alibaba.druid.pool.DruidDataSource
initialSize: 5
minIdle: 5
maxActive: 20
maxWait: 60000
timeBetweenEvictionRunsMillis: 60000
minEvictableIdleTimeMillis: 300000
validationQuery: SELECT 1 FROM DUAL
testWhileIdle: true
testOnBorrow: false
testOnReturn: false
poolPreparedStatements: true
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
filters: stat,wall,log4j
connectionProperties: druid.stat.mergeSql=true;druid.stat.slowSqlMillis=5000
# mybatis-plus相关配置
mybatis-plus:
# xml扫描，多个目录用逗号或者分号分隔（告诉 Mapper 所对应的 XML 文件位置）
mapper-locations: classpath:mapper/*.xml
# 以下配置均有默认值,可以不设置
global-config:
db-config:
#主键类型 auto:"数据库ID自增" 1:"用户输入ID",2:"全局唯一ID (数字类型唯一ID)", 3:"全局唯一ID UUID";
id-type: auto
#字段策略 IGNORED:"忽略判断" NOT_NULL:"非 NULL 判断") NOT_EMPTY:"非空判断"
field-strategy: NOT_EMPTY
#数据库类型
db-type: MYSQL
#驼峰下划线转换
db-column-underline: true
#mp2.3+ 全局表前缀 p_
#table-prefix: mp_
#刷新mapper 调试神器
refresh-mapper: true
#数据库大写下划线转换
#capital-mode: true
#逻辑删除配置（下面3个配置）
logic-delete-value: 4
logic-not-delete-value: 0
configuration:
#配置返回数据库(column下划线命名&&返回java实体是驼峰命名)，自动匹配无需as（没开启这个，SQL需要写as： select user_id as userId）
map-underscore-to-camel-case: true
# 如果查询结果中包含空值的列，则 MyBatis 在映射的时候，不会映射这个字段
call-setters-on-nulls: true
cache-enabled: false
#配置JdbcTypeForNull, oracle数据库必须配置
jdbc-type-for-null: 'null'
# 这个配置会将执行的sql打印出来，在开发或测试的时候可以用
log-impl: org.apache.ibatis.logging.stdout.StdOutImplpackage com.sxpcwlkj.product_server.config;
import com.alibaba.druid.support.http.StatViewServlet;
import com.alibaba.druid.support.http.WebStatFilter;
import org.springframework.context.annotation.Configuration;
import org.springframework.boot.web.servlet.FilterRegistrationBean;
import org.springframework.boot.web.servlet.ServletRegistrationBean;
import org.springframework.context.annotation.Bean;
/**
* @author Alan Chen
* @description Druid连接池监控平台 http://localhost:8080/druid/index.html
* @date 2019/6/4
*/
@Configuration
public class DruidConfiguration {
@Bean
public ServletRegistrationBean startViewServlet(){
ServletRegistrationBean servletRegistrationBean = new ServletRegistrationBean(new StatViewServlet(),"/druid/*");
// IP白名单
servletRegistrationBean.addInitParameter("allow","127.0.0.1");
// IP黑名单(共同存在时，deny优先于allow)
servletRegistrationBean.addInitParameter("deny","127.0.0.2");
//控制台管理用户
servletRegistrationBean.addInitParameter("loginUsername","admin");
servletRegistrationBean.addInitParameter("loginPassword","123456");
//是否能够重置数据
servletRegistrationBean.addInitParameter("resetEnable","false");
return servletRegistrationBean;
}
@Bean
public FilterRegistrationBean statFilter(){
FilterRegistrationBean filterRegistrationBean = new FilterRegistrationBean(new WebStatFilter());
//添加过滤规则
filterRegistrationBean.addUrlPatterns("/*");
//忽略过滤的格式
filterRegistrationBean.addInitParameter("exclusions","*.js,*.gif,*.jpg,*.png,*.css,*.ico,/druid/*");
return filterRegistrationBean;
}
}package com.sxpcwlkj.product_server.config;
import com.alibaba.druid.pool.DruidDataSource;
import org.springframework.boot.context.properties.ConfigurationProperties;
import org.springframework.context.annotation.Bean;
import org.springframework.context.annotation.Configuration;
import javax.sql.DataSource;
@Configuration
public class DruidConfig {
@ConfigurationProperties(prefix = "spring.datasource")
@Bean
public DataSource druid() {
return new DruidDataSource();
}
}
package com.sxpcwlkj.product_server.config;
import com.baomidou.mybatisplus.extension.plugins.PaginationInterceptor;
import org.springframework.boot.autoconfigure.condition.ConditionalOnClass;
import org.springframework.context.annotation.Bean;
import org.springframework.context.annotation.Configuration;
/**
* MybatisPlus 配置
*/
@Configuration
@ConditionalOnClass(value = {PaginationInterceptor.class})
public class MybatisPlusConfig {
@Bean
public PaginationInterceptor paginationInterceptor() {
PaginationInterceptor paginationInterceptor = new PaginationInterceptor();
return paginationInterceptor;
}
}
