spring boot 与 mybatis集合创建项目

布满荆棘的人生 2021-09-27 15:28 203阅读 0赞

1，建立项目在pom.xml导入jar

<?xml version="1.0" encoding="UTF-8"?>
    <project xmlns="http://maven.apache.org/POM/4.0.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
    xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">
    	<modelVersion>4.0.0</modelVersion>
    
    	<groupId>com.qxmof</groupId>
    	<artifactId>springutil</artifactId>
    	<version>0.0.1-SNAPSHOT</version>
    	<packaging>jar</packaging>
    
    	<name>springutil</name>
    	<description>Demo project for Spring Boot</description>
    
    	<parent>
    		<groupId>org.springframework.boot</groupId>
    		<artifactId>spring-boot-starter-parent</artifactId>
    		<version>2.0.3.RELEASE</version>
    		<relativePath/> 
    	</parent>
    
    	<properties>
    		<mysql-connector.version>5.1.38</mysql-connector.version>
    		<project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
    		<project.reporting.outputEncoding>UTF-8</project.reporting.outputEncoding>
    		<java.version>1.8</java.version>
    	</properties>
    
    	<dependencies>
    		<dependency>
    			<groupId>org.springframework.boot</groupId>
    			<artifactId>spring-boot-starter-web</artifactId>
    		</dependency>
    
    		<dependency>
    			<groupId>org.springframework.boot</groupId>
    			<artifactId>spring-boot-starter-test</artifactId>
    			<scope>test</scope>
    		</dependency>
    		
            <dependency>
    		    <groupId>org.mybatis.spring.boot</groupId>
    		    <artifactId>mybatis-spring-boot-starter</artifactId>
    		    <version>1.3.2</version>
    		</dependency>
            <dependency>
    			<groupId>mysql</groupId>
    			<artifactId>mysql-connector-java</artifactId>
    			<version>${mysql-connector.version}</version>
    		</dependency>
    		
    	</dependencies>
    
    	<build>
    		<plugins>
    			<plugin>
    				<groupId>org.springframework.boot</groupId>
    				<artifactId>spring-boot-maven-plugin</artifactId>
    				
    				<dependencies>
                        <dependency>
                            <groupId>org.springframework</groupId>
                            <artifactId>springloaded</artifactId>
                            <version>1.2.5.RELEASE</version>
                        </dependency>
                    </dependencies>
                    
    			</plugin>
    		</plugins>
    	</build>
    
    
    </project>

2，数据库配置

server.port=8080
    spring.datasource.url=jdbc:mysql://localhost:3306/springboot
    spring.datasource.username=root
    spring.datasource.password=123456
    spring.datasource.driver-class-name=com.mysql.jdbc.Driver
    
    spring.jpa.database=MYSQL
    spring.jpa.show-sql=true
    spring.jpa.hibernate.ddl-auto=update

# mybatis设置 #

3，设置spring boot启动器初始化加载

@SpringBootApplication
    @MapperScan(basePackages = {"com.qxmof.springutil.test.mapper","com.qxmof.springutil.test.service"})
    public class SpringutilApplication {
    
    	public static void main(String[] args) {
    		SpringApplication.run(SpringutilApplication.class, args);
    	}
    }

此处@MapperScan是加载时需要注入的包路径（建议使用注解在mapper文件上注解@Mapper将文件注入）

在配置类上添加以上注解，可以扫描dao包中的所有接口，替代在每个dao中写@Mapper注解，不过这样会提高耦合度。而@Mapper可以与dao自成一体，与@Controller、@Service遥相呼应，整体结构更优雅

@Mapper：声明一个mybatis的dao接口，会被spring boot扫描到

4，Mapper接口类

@Mapper
    public interface TestMapper {
    
    	@Select("select * from es_test")
    	Test getById();
    	
    	@Options(useGeneratedKeys= true,keyProperty = "id")//需要返回id时这样注解
    	int insertTest(Test test);
    }

此mapper类中sql用的注解格式，也可以使用xml格式

4.1xml格式sql

<?xml version="1.0" encoding="UTF-8"?>
    <!DOCTYPE mapper PUBLIC "-//mybatis.org//DTD Mapper 3.0//EN"
            "http://mybatis.org/dtd/mybatis-3-mapper.dtd" >
    <mapper namespace="com.qxmof.springutil.test.mapper.TestMapper">
        <resultMap id="testMap" type="com.qxmof.springutil.model.Test">
            <result property="name" column="name"/>
            <result property="age" column="age"/>
            <result property="createtime" column="createtime"/>
        </resultMap>
        <select id="getById" resultType="testMap">
            SELECT * FROM es_test
        </select>
        <insert id="insertTest" parameterType="String"  useGeneratedKeys="true" keyProperty="id">
        	insert into es_test (name) value (#{name}); 
        </insert>
    </mapper>

xml和注解格式的sql选择其一即可，建议选择注解格式

5，实现层

@Service
    public class ServiceTest implements IServiceTest {
    
    	@Autowired
    	private TestMapper testMapper;
    	
    	
    	@Override
    	public Test getTest1() {
    		return testMapper.getById();
    	}
    
    }

6，接口层

public interface IServiceTest \{

Test getTest1();  
\}

至此最简单的一个spring boot加mybatis项目构建完成