企业 SpringBoot 教程（六）springboot整合mybatis

蔚落 2022-03-12 13:38 297阅读 0赞

引入依赖

在pom文件引入mybatis-spring-boot-starter的依赖：完整项目的源码来源 技术支持一七九一七四三三八零

<dependency>
         <groupId>org.mybatis.spring.boot</groupId>
         <artifactId>mybatis-spring-boot-starter<artifactId>
         <version>1.3.0</version>
     </dependency>

引入数据库连接依赖：

<dependency>
                <groupId>mysql</groupId>
                <artifactId>mysql-connector-java</artifactId>
                <scope>runtime</scope>
            </dependency>
            <dependency>
                <groupId>com.alibaba</groupId>
                <artifactId>druid</artifactId>
                <version>1.0.29</version>
            </dependency>

引入数据源

application.properties配置文件中引入数据源：

spring.datasource.url=jdbc:mysql://localhost:3306/test
    spring.datasource.username=root
    spring.datasource.password=123456
    spring.datasource.driver-class-name=com.mysql.jdbc.Driver

这样，springboot就可以访问数据了。

创建数据库表

建表语句：

-- create table `account`
    # DROP TABLE `account` IF EXISTS
    CREATE TABLE `account` (
      `id` int(11) NOT NULL AUTO_INCREMENT,
      `name` varchar(20) NOT NULL,
      `money` double DEFAULT NULL,
      PRIMARY KEY (`id`)
    ) ENGINE=InnoDB AUTO_INCREMENT=4 DEFAULT CHARSET=utf8;
    INSERT INTO `account` VALUES ('1', 'aaa', '1000');
    INSERT INTO `account` VALUES ('2', 'bbb', '1000');
    INSERT INTO `account` VALUES ('3', 'ccc', '1000');

具体实现

这篇文篇通过注解的形式实现。

创建实体：

public class Account { 
    private int id ; 
    private String name ; 
    private double money;
    
    setter… 
    getter… 
    }

dao层

@Mapper
    public interface AccountMapper {
     
        @Insert("insert into account(name, money) values(#{name}, #{money})")
        int add(@Param("name") String name, @Param("money") double money);
     
        @Update("update account set name = #{name}, money = #{money} where id = #{id}")
        int update(@Param("name") String name, @Param("money") double money, @Param("id") int  id);
     
        @Delete("delete from account where id = #{id}")
        int delete(int id);
     
        @Select("select id, name as name, money as money from account where id = #{id}")
        Account findAccount(@Param("id") int id);
     
        @Select("select id, name as name, money as money from account")
        List<Account> findAccountList();
    }

service层

@Service
    public class AccountService {
        @Autowired
        private AccountMapper accountMapper;
     
        public int add(String name, double money) {
            return accountMapper.add(name, money);
        }
        public int update(String name, double money, int id) {
            return accountMapper.update(name, money, id);
        }
        public int delete(int id) {
            return accountMapper.delete(id);
        }
        public Account findAccount(int id) {
            return accountMapper.findAccount(id);
        }
        public List<Account> findAccountList() {
            return accountMapper.findAccountList();
        }
    }