二、spring boot配置mybatis

 
    spring boot的默认配置文件在resources/ 
   application.properties 
   下，首先需要配置数据源 
  

spring.datasource.url=jdbc:mysql://localhost:3306/shop spring.datasource.username=root spring.datasource.password=****** spring.datasource.driver-class-name=com.mysql.jdbc.Driver

 
    然后如果如果想使用mybatis需要对mybatis进行配置，我们知道mybatis的使用方式有两种，一种是使用注解的方式写sql语句 
  

@Select("SELECT * FROM user WHERE name = #{name}") User findByName(@Param("name") String name); @Results({ @Result(property = "name", column = "name"), @Result(property = "age", column = "age") }) @Select("SELECT name, age FROM user") List<User> findAll(); @Insert("INSERT INTO user(name, age) VALUES(#{name}, #{age})") int insert(@Param("name") String name, @Param("age") Integer age);

 
    另外还有一种是使用mapper文件，每一个dao层只写接口不写实现，然后对应写一个mapper.xml文件。 
  

 
   注解版 
  

 
    首先新建一个测试数据库，tb_user有id、username、password三个字段，自己伪造几条数据，这里只是将spring boot和mybatis跑通，就是简单的查询。 
  

pojo中写一个user实体类

public class User { private String username; private String password; public String getUsername() { return username; } public void setUsername(String username) { this.username = username; } public String getPassword() { return password; } public void setPassword(String password) { this.password = password; } }

dao中写mapper接口

public interface TbUserMapper { @Select("SELECT * FROM tb_user WHERE username = #{username}") User findByName(@Param("username") String username); }

加扫描包

写一个test类

@RunWith(SpringRunner.class) @SpringBootTest public class UserMapperTest { @Autowired private TbUserMapper tbUserMapper; @Test public void testQuery() throws Exception { User users = tbUserMapper.findByName("tidy"); System.out.println(users.getPassword()); } }

运行test结果

 
    到此注解的方式就完成了 
  

 
   xml形式 
  

 
    修改application.properties 
  

mybatis.config-locations=classpath:mybatis/mybatis-config.xml mybatis.mapper-locations=classpath:mybatis/mapper/*.xml mybatis.type-aliases-package=com.shop.pojo spring.datasource.url=jdbc:mysql://localhost:3306/shop spring.datasource.username=root spring.datasource.password=****** spring.datasource.driver-class-name=com.mysql.jdbc.Driver

 
    修改TbUserMapper  
  

public interface TbUserMapper { User findByName(@Param("username") String username); }

添加配置文件

 
    添加配置文件TbUserMapper.xml和mybatis-config.xml.目录同application.properties配置目录相同。 
  

 
   mybatis-config.xml 这与SSM配置相同，也可配置其他内容，如分页插件 
  

<?xml version="1.0" encoding="UTF-8" ?> <!DOCTYPE configuration PUBLIC "-//mybatis.org//DTD Config 3.0//EN" "http://mybatis.org/dtd/mybatis-3-config.dtd"> <configuration>  <typeAliases> <typeAlias alias="Integer" type="java.lang.Integer" /> <typeAlias alias="Long" type="java.lang.Long" /> <typeAlias alias="HashMap" type="java.util.HashMap" /> <typeAlias alias="LinkedHashMap" type="java.util.LinkedHashMap" /> <typeAlias alias="ArrayList" type="java.util.ArrayList" /> <typeAlias alias="LinkedList" type="java.util.LinkedList" /> </typeAliases> </configuration>

 
   mybatis-config.xml 
  

<?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.shop.mapper.TbUserMapper" > <resultMap id="user" type="com.shop.pojo.User" > <result column="username" property="username" jdbcType="VARCHAR" /> <result column="password" property="password" jdbcType="VARCHAR" /> </resultMap> <select id="findByName" resultMap="user" > SELECT username,password FROM tb_user WHERE username = #{username} </select> </mapper>

 
    其他内容不变，运行测试类结果相同 
  

 
    xml形式完成后项目目录如下： 
  

二、spring boot配置mybatis

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