详解springboot中mybatis注解形式

springboot整合mybatis对数据库进行访问，本实例采用注解的方式，如下：

pom.xml文件

 <parent>
    <groupId>org.springframework.boot</groupId>
    <artifactId>spring-boot-starter-parent</artifactId>
    <version>2.0.5.RELEASE</version>
  </parent>
  <properties>
    <project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
    <maven.compiler.source>1.8</maven.compiler.source>
    <maven.compiler.target>1.8</maven.compiler.target>
  </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.springframework.boot</groupId>
      <artifactId>spring-boot-starter-web</artifactId>
    </dependency>
    <dependency>
      <groupId>mysql</groupId>
      <artifactId>mysql-connector-java</artifactId>
      <version>5.1.45</version>
    </dependency>
    <dependency>
      <groupId>org.springframework.boot</groupId>
      <artifactId>spring-boot-starter-jdbc</artifactId>
    </dependency>
    <dependency>
      <groupId>org.springframework.boot</groupId>
      <artifactId>spring-boot-configuration-processor</artifactId>
      <optional>true</optional>
    </dependency>
    <dependency>
      <groupId>org.mybatis.spring.boot</groupId>
      <artifactId>mybatis-spring-boot-starter</artifactId>
      <version>1.3.1</version>
    </dependency>
  </dependencies>

  <build>
    <plugins>
      <plugin>
        <groupId>org.springframework.boot</groupId>
        <artifactId>spring-boot-maven-plugin</artifactId>
      </plugin>
    </plugins>
  </build>
</project>

domain类

package com.rookie.bigdata.domain;

/**
 * @author
 * @date 2018/10/9
 */
public class Student {
  private Long stuNo;
  private String name;
  private Integer age;
  public Student() {
  }
  public Student(String name, Integer age) {
    this.name = name;
    this.age = age;
  }
  public Student(Long stuNo, String name, Integer age) {
    this.stuNo = stuNo;
    this.name = name;
    this.age = age;
  }
  public Long getStuNo() {
    return stuNo;
  }
  public void setStuNo(Long stuNo) {
    this.stuNo = stuNo;
  }
  public String getName() {
    return name;
  }
  public void setName(String name) {
    this.name = name;
  }
  public Integer getAge() {
    return age;
  }
  public void setAge(Integer age) {
    this.age = age;
  }
  @Override
  public boolean equals(Object o) {
    if (this == o) return true;
    if (o == null || getClass() != o.getClass()) return false;
    Student student = (Student) o;
    if (stuNo != null ? !stuNo.equals(student.stuNo) : student.stuNo != null) return false;
    if (name != null ? !name.equals(student.name) : student.name != null) return false;
    return age != null ? age.equals(student.age) : student.age == null;
  }
  @Override
  public int hashCode() {
    int result = stuNo != null ? stuNo.hashCode() : 0;
    result = 31 * result + (name != null ? name.hashCode() : 0);
    result = 31 * result + (age != null ? age.hashCode() : 0);
    return result;
  }
  @Override
  public String toString() {
    return "Student{" +
        "stuNo=" + stuNo +
        ", name='" + name + '\'' +
        ", age=" + age +
        '}';
  }
}

StudentMapper类

package com.rookie.bigdata.mapper;
import com.rookie.bigdata.domain.Student;
import org.apache.ibatis.annotations.*;
import java.util.List;
import java.util.Map;
/**
 * @author
 * @date 2018/10/9
 */
@Mapper
public interface StudentMapper {

  @Select("SELECT * FROM student WHERE name = #{name}")
  Student findByName(@Param("name") String name);

  @Results({
      @Result(property = "name", column = "name"),
      @Result(property = "age", column = "age")
  })
  @Select("SELECT name, age FROM student")
  List<Student> findAll();

  @Insert("INSERT INTO student(name, age) VALUES(#{name}, #{age})")
  int insert(@Param("name") String name, @Param("age") Integer age);

  @Update("UPDATE student SET age=#{age} WHERE name=#{name}")
  void update(Student student);

  @Delete("DELETE FROM student WHERE id =#{id}")
  void delete(Long id);

  @Insert("INSERT INTO student(name, age) VALUES(#{name}, #{age})")
  int insertByUser(Student student);

  @Insert("INSERT INTO student(name, age) VALUES(#{name,jdbcType=VARCHAR}, #{age,jdbcType=INTEGER})")
  int insertByMap(Map<String, Object> map);

}

测试类如下：

package com.rookie.bigdata.mapper;
import org.junit.Test;
import org.junit.runner.RunWith;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.boot.test.context.SpringBootTest;
import org.springframework.test.context.junit4.SpringRunner;
import org.springframework.transaction.annotation.Transactional;
import static org.junit.Assert.*;
/**
 * @author
 * @date 2018/10/10
 */
@RunWith(SpringRunner.class)
@SpringBootTest
public class StudentMapperTest {

  @Autowired
  private StudentMapper studentMapper;

  @Test
  public void findByName() throws Exception {
    System.out.println(studentMapper.findByName("zhangsan"));
  }

  @Test
  public void findAll() throws Exception {
    System.out.println(studentMapper.findByName("zhangsan"));
  }

  @Test
  public void insert() throws Exception {
    System.out.println(  studentMapper.insert("zhangsan", 20));
  }

  @Test
  public void update() throws Exception {
  }

  @Test
  public void delete() throws Exception {
  }

  @Test
  public void insertByUser() throws Exception {
  }

  @Test
  public void insertByMap() throws Exception {
  }
}

大家可以自己编写测试类进行测试一下，后续会更新xml的配置方式和mybatis采用多数据源进行配置的方式