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前言:
本项目基于maven构建,使用mybatis-spring-boot作为spring-boot项目的持久层框架
spring-boot中使用mybatis持久层框架与原spring项目使用方式和注解都不相同,需要依赖mybatis-spring-boot包
1、引入mybatis和数据库及其他项目依赖
1.1、引入mybatis依赖
- <!-- mybatis-spring-boot --> <dependency> <groupId></groupId> <artifactId></artifactId> <version></version> </dependency>
1.2、引入mysql 驱动
- <!-- mysql--> <dependency> <groupId></groupId> <artifactId></artifactId> </dependency>
1.3、项目pom.xml一览
- <project= =
- => <modelVersion></modelVersion> <groupId></groupId> <artifactId></artifactId> <packaging></packaging> <version></version> <name></name> <parent> <groupId></groupId> <artifactId></artifactId> <version></version> </parent> <dependencies>
- <dependency> <groupId></groupId> <artifactId></artifactId> <exclusions><exclusion><groupId></groupId> <artifactId></artifactId></exclusion></exclusions>> </dependency>
- <dependency> <groupId></groupId> <artifactId></artifactId> </dependency>
- <dependency> <groupId></groupId> <artifactId></artifactId> </dependency> <dependency> <groupId></groupId> <artifactId></artifactId> </dependency>
- <dependency> <groupId></groupId> <artifactId></artifactId> </dependency> <dependency> <groupId></groupId> <artifactId></artifactId> <scope></scope> </dependency> <dependency> <groupId></groupId> <artifactId></artifactId> <scope></scope> </dependency>
- <dependency> <groupId></groupId> <artifactId></artifactId> <version></version> </dependency>
- <dependency> <groupId></groupId> <artifactId></artifactId> <version></version> </dependency> <dependency> <groupId></groupId> <artifactId></artifactId> <version></version> </dependency> </dependencies> <profiles> <profile> <id></id> <dependencies> > <dependency> <groupId></groupId> <artifactId></artifactId> <type></type> </dependency> </dependencies> </profile> </profiles>
- <build> <plugins> <plugin> <groupId></groupId> <artifactId></artifactId> </plugin> </plugins> </build> <repositories> <repository> <id></id> <url></url> </repository> </repositories> <pluginRepositories> <pluginRepository> <id></id> <url></url> </pluginRepository> </pluginRepositories> </project>
2、配置数据库连接参数、设置mybatis的mappers所在包以及spring-boot服务参数配置
在项目根目录下创建一个application.properties,该文件用于定义spring-boot的相关参数及数据库参数,以及配置mybatis的mappers扫描路径
如果是maven项目,application.properties放在src/main/resource/目录下
配置如下:
spring.datasource.url=jdbc:MySQL://127.0.0.1:3306/test
spring.datasource.username=root
spring.datasource.password=eguid
spring.datasource.driver-class-name=com.mysql.jdbc.Driver
spring.datasource.max-idle=5
spring.datasource.max-wait=10000
spring.datasource.min-idle=1
spring.datasource.initial-size=3
server.port=8088
server.session.timeout=10
server.tomcat.max-threads=800
server.tomcat.uri-encoding=UTF-8
mybatis.mapperLocations=classpath:cn/eguid/carSysWEB/mappers/*.xml
3、mybatis的dao接口及mapper.xml实现
3.1、定义mybatis的dao接口
该接口与mybatis-spring方式不同,需要加上一个@Mapper注解
@Mapper注解用于声明该接口为mybatis的dao接口
-
package
import
import
import
import
//使用Mapper注解声明该接口为mybatis的dao接口
@Mapper
publicinterface
public
public(value = ) String org_parent_coding);
-
public(value=) String dep_id);
-
}
3.2、dao接口对应的mapper.xml
mapper.xml与原mybatis写法相同
-
<!DOCTYPE mapper
-
-
>
<mapper=>
<resultMap= =>
<id= =/>
<result= =/>
<result= =/>
<result= =/>
</resultMap>
<select= =>
</select>
<select= = =>
=#{parentCoding,=}
-
</select>
<select= = =>
=#{dep_id}
-
</select>
</mapper>
补充:
做完以上步骤,就可以在service中直接通过spring的IOC注解注入mybatis的dao实现,我这里的dao接口是GetInfoDao,所以是注入‘getInfoDao’就可以正确引用该持久层;
注意:必须在spring-boot的入口类中开启@ComponentScan注解才能扫描到项目中所有注解
-
package
import
import
import
import
@SpringBootApplication
//开启通用注解扫描
@ComponentScan
publicclassextends
* 实现SpringBootServletInitializer可以让spring-boot项目在web容器中运行
-
*/
-
protected
this
returnsuper
publicstaticvoid
class
}
5、总结:
1、spring-boot项目中使用mabatis需要依赖mybatis-spring-boot
2、需要在application.xml中定义数据库连接参数以及mybatis的mappers文件扫描路径
3、mybatis的dao接口需要加上@Mapper注解才能被spring-boot正确扫描到
4、spring-boot开启注解扫描的注解是@ComponentScan
6.让外部Tomcat运行Spring Boot项目
只需要在原项目上做两件事
1、在pom.xml中排除org.springframework.boot的内置tomcat容器
- <dependency>
- <groupId>org.springframework.boot</groupId>
- <artifactId>spring-boot-starter-web</artifactId>
- <exclusions>
- <exclusion>
- <groupId>org.springframework.boot</groupId>
- <artifactId>spring-boot-starter-tomcat</artifactId>
- </exclusion>
- </exclusions>
- </dependency>
2、spring-boot入口实现SpringBootServletInitializer接口
补充:SpringBootServletInitializer接口依赖javax.servlet包,需要在pom.xml中引入该包
spring-boot入口类必须实现SpringBootServletInitializer接口的configure方法才能让外部容器运行spring-boot项目
注意:SpringBootServletInitializer接口需要依赖 javax.servlet
-
package
import
import
import
import
import
import
import
import
@SpringBootApplication
// 开启通用注解扫描
@ComponentScan
publicclassextends
* 实现SpringBootServletInitializer可以让spring-boot项目在web容器中运行
-
*/
-
protected
this
returnsuper
publicstaticvoid
class
}