手把手教你SpringBoot整合Mybatis
目录
- MyBATis的简单介绍
- 1 环境搭建
- 2 整合方式一:注解版
- 2.1 配置
- 2.2 编码
- 2.3 测试
- 3 整合方式二:XML版
- 3.1 配置
- 3.2 编码
- 3.3 测试
- 4 总结
Mybatis的简单介绍
MyBatis 本是apache的一个开源项目iBatis, 2010年这个项目由apache software foundation 迁移到了google code,并且改名为MyBatis 。2013年11月迁移到github。
iBATIS一词来源于“internet”和“abatis”的组合,是一个基于Java的持久层框架。iBATIS提供的持久层框架包括SQL Maps和Data Access Objects(DAOs)
android MyBatis 是一款优秀的持久层框架,它支持定制化 SQL、存储过程以及高级映射。MyBatis 避免了几乎所有的 JDBC 代码和手动设置参数以及获取结果集。MyBatis 可以使用简单的 XML 或注解来配置和映射原生信息,将接口和 Java 的 POJOs(Plain Ordinary Java Object,普通的 Java对象)映射成数据库中的记录。
思想:ORM:Object Relational Mapping
Mybatis基本框架:
1 环境搭建
新建Spring Boot项目,引入依赖
pom.xml
<!--mysql--> <dependency> <groupId>mysql</groupId> <artifactId>mysql-connector-java</artifactId> <version>5.1.47</version> </dependency> <!--mybatis--> <dependency> <groupId>org.mybatis.spring.boot</groupId> <artifactId>mybatis-spring-boot-starter</artifactId> <version>1.3.2</versijavascripton> </dependency> <!--Druid数据源--> <dependency> <groupId>com.alibaba</groupId> <artifactId>druid-spring-boot-starter</artifactId> <version>1.1.9</version> </dependency> <!--测试--> <dependency> <groupId>org.springframework.boot</groupId> <artifactId>spring-boot-starter-test</artifactId> <scope>test</scope> </dependency>
DB-sql
CREATE TABLE `student` ( `id` int(11) NOT NULL AUTO_INCREMENT, `name` varchar(255) DEFAULT NULL, `age` int(11) DEFAULT NULL, PRIMARY KEY (`id`) ) ENGINE=InnoDB AUTO_INCREMENT=13 DEFAULT CHARSET=utf8;
项目结构
2 整合方式一:注解版
2.1 配置
server: port: 8081 spring: datasource: # 配置数据库 username: root password: 12345 driver-class-name: com.mysql.jdbc.Driver url: jdbc:mysql://localhost:3306/test #数据库名 type: com.alibaba.druid.pool.DruidDataSource
2.2 编码
/** * 注解版 */ @Mapper @Repository public interface JavaStudentMapper { /** * 添加一个学生 * * @param student * @return */ @Insert("insert into student(name, age) " + "values (#{name}, #{age})") public int saveStudent(Student student); /** * 根据ID查看一名学生 * * @param id * @return */ @Select("select * " + "from student " + "where id = #{id}") public Student findStudentById(Integer id); /** * 查询全部学生 * * @return */ @Select("select * " + "from student") @Results({ @Result(property = "id", column = "id"), @Result(property = "name", column = "jsname"), @Result(property = "age", column = "age") }) public List<Student> findAllStudent(); /** * 根据ID删除一个 * * @param id * @return */ @Delete("delete " + "from student " + "where id = #{id}") public int removeStudentById(Integer id); /** * 根据ID修改 * * @param student * @return */ @Update("update set name=#{name},age=#{age} " + "where id=#{id}") public int updateStudentById(Student student); }
2.3 测试
@Autowired private JavaStudentMapper 编程studentMapper; @Test void testJavaMapperInsert() { Student student = new Student("张三", 22); System.out.println(studentMapper.saveStudent(student)); } @Test void testJavaMapperFind() { System.out.println(studentMapper.findStudentById(2)); } @Test void testJavaMapperFindAll() { System.out.println(studentMapper.findAllStudent()); } @Test void testJavaMapperUpdate() { Student student = new Student(2, "张三", 22); System.out.println(studentMapper.updateStudentById(student)); } @Test void testJavaMapperDelete() { System.out.println(studentMapper.removeStudentById(2)); }
3 整合方式二:XML版
3.1 配置
server: port: 8081 spring: application: name: hospitalManager #项目名 datasource: # 配置数据库 username: root password: 12345 driver-class-name: com.mysql.jdbc.Driver url: jdbc:mysql://localhost:3306/test #数据库名 type: com.alibaba.druid.pool.DruidDataSource mybatis: mapper-locations: classpath:mapper/*Mapper.xml #扫描resources下的mapper文件夹下的xml文件 type-aliases-package: org.ymx.sp_mybatis.pojo #实体类所在包,定义别名
主启动类:
@SpringB开发者_开发学习ootApplication @MapperScan("org.ymx.sp_mybatis.xmlMapper") //扫描的mapper public class SpMybatisApplication { public static void main(String[] args) { SpringApplication.run(SpMybatisApplication.class, args); } }
3.2 编码
/** * xml版 */ @Mapper @Repository public interface XmlStudentMapper { /** * 添加一个学生 * * @param student * @return */ public int saveStudent(Student student); /** * 根据ID查看一名学生 * * @param id * @return */ public Student findStudentById(Integer id); /** * 查询全部学生 * * @return */ public List<Student> findAllStudent(); /** * 根据ID删除一个 * * @param id * @return */ public int removeStudentById(Integer id); /** * 根据ID修改 * * @param student * @return */ public int updateStudentById(Student student); }
xml文件(StudentMapper.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="org.ymx.sp_mybatis.dao.xmlMapper.XmlStudentMapper"> <!-- 添加学生--> <insert id="saveStudent" parameterType="org.ymx.sp_mybatis.pojo.Student" useGeneratedKeys="true" keyProperty="id"> insert into student(name, age) values (#{name}, #{age}) </insert> <!--查看学生根据ID--> <select id="findStudentById" parameterType="integer" resultType="org.ymx.sp_mybathttp://www.devze.comis.pojo.Student"> select * from student where id = #{id} </select> <!--查看全部学生--> <select id="findAllStudent" resultMap="studentResult"> select * from student </select> <!--删除学生根据ID--> <delete id="removeStudentById" parameterType="integer"> delete from student where id = #{id} </delete> <!--修改学生根据ID--> <update id="updateStudentById" parameterType="org.ymx.sp_mybatis.pojo.Student"> update student set name=#{name}, age=#{age} where id = #{id} </update> <!--查询结果集--> <resultMap id="studentResult" type="org.ymx.sp_mybatis.pojo.Student"> <result column="id" javaType="INTEGER" jdbcType="INTEGER" property="id"/> <result column="name" javaType="STRING" jdbcType="VARCHAR" property="name"/> <result column="age" javaType="INTEGER" jdbcType="INTEGER" property="age"/> </resultMap> </mapper>
3.3 测试
@Autowired private XmlStudentMapper studentMapper; @Test void testJavaMapperInsert() { Student student = new Student("张三", 22); System.out.println(studentMapper.saveStudent(student)); } @Test void testJavaMapperFind() { System.out.println(studentMapper.findStudentById(2)); } @Test void testJavaMapperFindAll() { System.out.println(studentMapper.findAllStudent()); } @Test void testJavaMapperUpdate() { Student student = new Student(2, "张三", 22); System.out.println(studentMapper.updateStudentById(student)); } @Test void testJavaMapperDelete() { System.out.println(studentMapper.removeStudentById(2)); }
4 总结
基本步骤:
注意事项:
(1)相比注解方式,更推荐使用xml方式,因为注解方式将SQL语句嵌套到Java代码中,一旦需要修改则需要重新编译项目,而xml方式则不需要重新编译项目
(2)xml方式需要在主启动函数或配置类中配置接口的扫描路径
到此这篇关于手把手教你SpringBoot整合Mybatis的文章就介绍到这了,更多相关SpringBoot整合Mybatis内容请搜索我们以前的文章或继续浏览下面的相关文章希望大家以后多多支持我们!
精彩评论