Springboot入門之整合mybatis

1，建立maven工程，在pom.xml中添加jar包依賴。

<?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.travelsky.springboot</groupId>
    <artifactId>03-springboot-mybatis</artifactId>
    <version>1.0.0</version>    
    <!--繼承springboot父級項目的依賴-->
    <parent>
        <groupId>org.springframework.boot</groupId>
        <artifactId>spring-boot-starter-parent</artifactId>
        <version>2.0.2.RELEASE</version>
        <relativePath/> <!-- lookup parent from repository -->
    </parent>
    <!--屬性配置-->
    <properties>
        <project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
        <project.reporting.outputEncoding>UTF-8</project.reporting.outputEncoding>
        <java.version>1.8</java.version>
    </properties>

    <dependencies>
        <!--springboot開發web項目的起步依賴-->
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-web</artifactId>
        </dependency>
        <!--加載mybatis整合springboot-->
        <dependency>
            <groupId>org.mybatis.spring.boot</groupId>
            <artifactId>mybatis-spring-boot-starter</artifactId>
            <version>1.3.1</version>
        </dependency>
        <!--MySQL的jdbc驅動-->
        <dependency>
            <groupId>mysql</groupId>
            <artifactId>mysql-connector-java</artifactId>
        </dependency>

    </dependencies>

    <build>
        <plugins>
            <!--配置mybatis自動生成器插件-->
            <plugin>
                <groupId>org.mybatis.generator</groupId>
                <artifactId>mybatis-generator-maven-plugin</artifactId>
                <version>1.3.6</version>
                <configuration>
                    <!--配置檔案的位置-->
                    <configurationFile>GeneratorMapper.xml</configurationFile>
                    <verbose>true</verbose>
                    <overwrite>true</overwrite>
                </configuration>
            </plugin>

        </plugins>

    </build>
</project>      

2，建立資料庫springbootmb，建立表student

3，建立application.properties檔案，指定mapper.xml檔案的路徑和資料源資訊。

#指定mapper.xml檔案的路徑
mybatis.mapper-locations=classpath:com/travelsky/springboot/mapper/*.xml

########################################################
###datasource -- 指定mysql資料庫連接配接資訊.
########################################################
spring.datasource.url = jdbc:mysql://localhost:3306/springboot
spring.datasource.username = root
spring.datasource.password = root
spring.datasource.driver-class-name=com.mysql.jdbc.Driver      

4，将mybatis自動生成器GeneratorMapper.xml放入工程中

<?xml version="1.0" encoding="UTF-8" ?>
<!DOCTYPE generatorConfiguration
        PUBLIC "-//mybatis.org//DTD MyBatis Generator Configuration 1.0//EN"
        "http://mybatis.org/dtd/mybatis-generator-config_1_0.dtd">
<generatorConfiguration>

    <!--指定連接配接資料庫的JDBC驅動包所在位置，指定到你本機的完整路徑 
    需要確定本地maven倉庫中是否含有此資料庫驅動jar包-->
    <classPathEntry location="E:/repository/mysql/mysql-connector-java/5.1.41/mysql-connector-java-5.1.41.jar"/>

    <!--配置table表資訊内容體，targetRuntime指定采用mybatis3的版本-->
    <context id="tables" targetRuntime="MyBatis3">
        <!--抑制生成注釋，由于生成的注釋都是英文的，可以不讓它生成-->
        <commentGenerator>
            <property name="suppressAllComments" value="true"/>
        </commentGenerator>

        <!--配置資料庫連接配接資訊 每次需手動修改資料庫名和使用者名密碼-->
        <jdbcConnection driverClass="com.mysql.jdbc.Driver"
                        connectionURL="jdbc:mysql://localhost:3306/springbootmb"
                        userId="root"
                        password="root">
        </jdbcConnection>

        <!--生成model類，targetPackage指定model類的包名，targetProject指定生成的model放在工程下面那個位置-->
        <javaModelGenerator targetPackage="com.travelsky.springboot.model" targetProject="src/main/java">
            <property name="enableSubPackages" value="false"/>
            <property name="trimStrings" value="false"/>
        </javaModelGenerator>
        <!--生成mapper類，targetPackage指定mapper類的包名，targetProject指定生成的mapper放在工程下面那個位置-->
        <sqlMapGenerator targetPackage="com.travelsky.springboot.mapper" targetProject="src/main/java">
            <property name="enableSubPackages" value="false"/>

        </sqlMapGenerator>
        <!--生成Mybatis的Mapper.xml檔案，targetPackage指定mapper類的包名,targetProject指定生成的mapper.xml放在eclipse哪個工程下面-->
        <javaClientGenerator type="XMLMAPPER" targetPackage="com.travelsky.springboot.mapper"
                             targetProject="src/main/java">
            <property name="enableSubpackages" value="false"/>
        </javaClientGenerator>

        <!--資料庫表名以及對應的java模型類名 
        tableName：資料庫中表名    domainObjectName：生成的實體類名-->
        <table tableName="student"
               domainObjectName="Student"
               enableUpdateByExample="false"
               enableDeleteByExample="false"
               enableSelectByExample="false"
               selectByExampleQueryId="false"/>
    </context>


</generatorConfiguration>      

5，自動生成model和mapper

在IDEA的Maven Project中重新整理一下可以看到mybatis-generator，輕按兩下下面的mybatis-gennerator:generate

可以看到控制台BUILD SUCCESS

此時工程下生成了model和mapper

此時算是真正準備好了springboot與mybatis整合的開發環境

6，建立springboot的main方法 application.java，啟動springboot程式

加上@SpringBootApplication注解開啟自動掃描

import org.springframework.boot.SpringApplication;
import org.springframework.boot.autoconfigure.SpringBootApplication;

@SpringBootApplication
public class Application {
    public static void main(String[] args) {
        SpringApplication.run(Application.class,args);
    }
}      

7，在生成的mapper接口檔案類上加@Mapper注解，或者在運作的主類添加@MapperScan（“com.travelsky.springboot.mapper”）注解掃描

如果加上mapper注解後在接口實作類中注入mapper時候報錯，這是IEDA工具報錯，按照下圖步驟将錯誤修改為警告即可

8，建立service和controller通路資料庫傳回json格式資料

@Service
public class StudentServiceImpl implements StudentService {
    @Autowired
    private StudentMapper studentMapper;

    @Override
    public List<Student> getAll() {
        return studentMapper.selectAll();
    }
}      

@RestController
public class MyBatisController {
    @Autowired
    private StudentServiceImpl getAllStudentServiceImpl;

    @ResponseBody
    @RequestMapping("boot/getAll")
    public Object getAllStudent(){
        //調用service
        List<Student> list = getAllStudentServiceImpl.getAll();
        return list;
    }
}

      

通路結果：