SpringBoot整合Druid和mybatis-plus

Druid簡介

Java程序很大一部分要操作數據庫，為了提高性能操作數據庫的時候，又不得不使用數據庫連接池。
Druid 是阿里巴巴開源平台上一個數據庫連接池實現，結合了 C3P0、DBCP 等 DB 池的優點，同時加入了日志監控。
Druid 可以很好的監控 DB 池連接和 SQL 的執行情況，天生就是針對監控而生的 DB 連接池。
Druid已經在阿里巴巴部署了超過600個應用，經過一年多生產環境大規模部署的嚴苛考驗。
Spring Boot 2.0 以上默認使用 Hikari 數據源，可以說 Hikari 與 Driud 都是當前 Java Web 上最優秀的數據源，我們來重點介紹 Spring Boot 如何集成 Druid 數據源，如何實現數據庫監控。

pom.xml

 <!--數據庫驅動--> <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數據源--> <!-- 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

#服務的名稱 spring: application: name: product-service ########-spring datasource-######## datasource: #賬號配置 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連接池配置 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 #配置監控統計攔截的filters，去掉后監控界面sql無法統計，'wall'用於防火牆 filters: stat,wall,log4j connectionProperties: druid.stat.mergeSql=true;druid.stat.slowSqlMillis=5000 # mybatis-plus相關配置 mybatis-plus: # xml掃描，多個目錄用逗號或者分號分隔（告訴 Mapper 所對應的 XML 文件位置） mapper-locations: classpath:mapper/*.xml # 以下配置均有默認值,可以不設置 global-config: db-config: #主鍵類型 auto:"數據庫ID自增" 1:"用戶輸入ID",2:"全局唯一ID (數字類型唯一ID)", 3:"全局唯一ID UUID"; id-type: auto #字段策略 IGNORED:"忽略判斷" NOT_NULL:"非 NULL 判斷") NOT_EMPTY:"非空判斷" field-strategy: NOT_EMPTY #數據庫類型 db-type: MYSQL #駝峰下划線轉換 db-column-underline: true #mp2.3+ 全局表前綴 p_ #table-prefix: mp_ #刷新mapper 調試神器 refresh-mapper: true #數據庫大寫下划線轉換 #capital-mode: true #邏輯刪除配置（下面3個配置） logic-delete-value: 4 logic-not-delete-value: 0 configuration: #配置返回數據庫(column下划線命名&&返回java實體是駝峰命名)，自動匹配無需as（沒開啟這個，SQL需要寫as： select user_id as userId） map-underscore-to-camel-case: true # 如果查詢結果中包含空值的列，則 MyBatis 在映射的時候，不會映射這個字段 call-setters-on-nulls: true cache-enabled: false #配置JdbcTypeForNull, oracle數據庫必須配置 jdbc-type-for-null: 'null' # 這個配置會將執行的sql打印出來，在開發或測試的時候可以用 log-impl: org.apache.ibatis.logging.stdout.StdOutImpl

package 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連接池監控平台 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白名單 servletRegistrationBean.addInitParameter("allow","127.0.0.1"); // IP黑名單(共同存在時，deny優先於allow) servletRegistrationBean.addInitParameter("deny","127.0.0.2"); //控制台管理用戶 servletRegistrationBean.addInitParameter("loginUsername","admin"); servletRegistrationBean.addInitParameter("loginPassword","123456"); //是否能夠重置數據 servletRegistrationBean.addInitParameter("resetEnable","false"); return servletRegistrationBean; } @Bean public FilterRegistrationBean statFilter(){ FilterRegistrationBean filterRegistrationBean = new FilterRegistrationBean(new WebStatFilter()); //添加過濾規則 filterRegistrationBean.addUrlPatterns("/*"); //忽略過濾的格式 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; } }