springboot[4]_配置mybatis

在springboot中使用mybatis

1. 建表
   在test库中，建立一张animal表，并存入三条数据。
   CREATE TABLE test.animal (
   id int(11) NOT NULL AUTO_INCREMENT,
   name varchar(30) CHARACTER SET latin1 COLLATE latin1_swedish_ci NULL DEFAULT NULL,
   PRIMARY KEY (id) USING BTREE
   ) ENGINE = InnoDB AUTO_INCREMENT = 1 CHARACTER SET = utf8 COLLATE = utf8_general_ci ROW_FORMAT = Compact;
   INSERT INTO test.animal(id, name) VALUES (1, 'dog');
   INSERT INTO test.animal(id, name) VALUES (2, 'cat');
   INSERT INTO test.animal(id, name) VALUES (3, 'pig');

2. 导入依赖
   导入mybatis 和 mysql 依赖，因为springboot有指定mysql的版本，所以我就没写版本。
   
   
   org.mybatis.spring.boot

        <artifactId>mybatis-spring-boot-starter</artifactId><version>1.1.1</version></dependency><dependency><groupId>mysql</groupId><artifactId>mysql-connector-java</artifactId></dependency>
   

3. yml配置
   spring:
   datasource:
   url: jdbc:mysql://127.0.0.1:3306/test?characterEncoding=UTF-8
   username: root
   password: 1234
   driver-class-name: com.mysql.cj.jdbc.Driver

4. entity，mapper和service
   AnimalMapper: (注解方式，当然也可以使用xml配置)
   @Mapper
   public interface AnimalMapper {
   @Select("select * from animal")
   List selectAll();

   @Select("select * from animal where id = #{id}")
   Animal selectByKey(Integer id);

   /**

   • 因为是自增id，所有加上@Options注解
     /
     @Insert("insert into animal(id,name) values (#{id}, #{name}) ")
     @Options(useGeneratedKeys = true, keyProperty = "id")
     void insertOne(Animal animal);
     }
     IAnimal:
     public interface IAnimal {
     /*
   • 查找所有
     */
     List selectAll();

   /**

   • 按主键查找
     */
     Animal selectByKey(Integer id);

   /**

   • 添加一个元素
     */
     void insertOne(Animal animal);
     }
     AnimalImpl
     @Service
     public class AnimalImpl implements IAnimal {
     @Resource
     private AnimalMapper animalMapper;

   @Override
   public List selectAll() {
   return animalMapper.selectAll();
   }

   @Override
   public Animal selectByKey(Integer id) {
   return animalMapper.selectByKey(id);
   }

   @Override
   public void insertOne(Animal animal) {
   animalMapper.insertOne(animal);
   }
   }
   Animal:
   public class Animal {
   private Integer id;

   private String name;

   public Integer getId() {
   return id;
   }

   public void setId(Integer id) {
   this.id = id;
   }

   public String getName() {
   return name;
   }

   public void setName(String name) {
   this.name = name;
   }
   }

5. 控制层
   AnimalController
   @RestController
   public class AnimalController {
   @Resource
   private IAnimal iAnimal;

   @GetMapping("/getAll")
   public List getAll() {
   return iAnimal.selectAll();
   }

   @GetMapping("/getOne")
   public Animal getOne(@RequestParam("id") Integer id) {
   return iAnimal.selectByKey(id);
   }

   @PostMapping("/insertOne")
   public void insertOne(@RequestBody Animal animal) {
   iAnimal.insertOne(animal);
   }
   }

6. 测试
   ● 查所有数据
   

● 条件查询

● 新增数据