上一篇已經記錄了Springboot整合Thymeleaf
一、準備工作
首先準備好表和數據
pom依賴：
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-thymeleaf</artifactId>
</dependency>
<!-- mybatis-spring-boot-starter -->
<dependency>
<groupId>org.mybatis.spring.boot</groupId>
<artifactId>mybatis-spring-boot-starter</artifactId>
<version>2.0.1</version>
</dependency>
<!-- mysql-connector-java -->
<dependency>
<groupId>mysql</groupId>
<artifactId>mysql-connector-java</artifactId>
<version>5.1.47</version>
</dependency>
application.properties
spring.datasource.driver-class-name = com.mysql.jdbc.Driver
spring.datasource.url = jdbc:mysql://localhost:3306/數據庫名?useUnicode=true&characterEncoding=UTF-8&useSSL=false&serverTimezone=UTC
spring.datasource.username = root
spring.datasource.password = 密碼
新建Student類
public class Student {
private Integer id;
private String sname;
getter setter...
}
二、註解方式
新建mapper接口: StudentMapper 加上註解@Mapper
@Mapper
public interface StudentMapper {
@Select("select * from student")
List<Student> findAll();
}
對應的註解有：@Insert、@Delete、@Update
這裏省略service層,直接創建Controller
@Controller
@RequestMapping("/studentManage")
public class StudentController {
@Autowired
StudentMapper studentMapper;
@RequestMapping("/listStudent")
public String toStudentView(Model model){
List<Student> students = studentMapper.findAll();
model.addAttribute("students",students);
return "views/listStudent";
}
}
html:
<!DOCTYPE html>
<html lang="en" xmlns:th="http://www.w3.org/1999/xhtml">
<head>
<meta charset="UTF-8">
<title>學生</title>
</head>
<body>
<table>
<thead>
<tr>
<th>id</th>
<th>學生姓名</th>
</tr>
</thead>
<tbody>
<tr th:each="s: ${students}">
<td th:text="${s.id}"></td>
<td th:text="${s.sname}"></td>
</tr>
</tbody>
</table>
</body>
</html>
運行項目：訪問http://localhost:8080/studentManage/listStudent
註解方式對一些簡單的SQL來說還是很方便的，但是實際項目中肯定會有複雜SQL，而複雜的SQL放註解上簡直慘不忍睹，所以下面來說一下XML的方式。
三、XML方式
首先把mapper接口的@Select註解去掉
在StudentMapper同文件夾下新建StudentMapper.xml文件 這裏要注意namespace 學到這裏應該對MyBatis沒有疑惑了
<?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.test.demo.mapper.StudentMapper">
<select id="findAll" resultType="com.test.demo.domain.Student">
select * from student
</select>
</mapper>
注意：在properties文件中指明從哪裏去找xml配置文件
mybatis.mapper-locations=classpath:com/test/demo/mapper/*.xml
好了其他不用動，運行項目開始訪問： 一樣的效果
四、擴展
上文中提到要在mapper接口上添加註解@Mapper 實際項目中mapper接口肯定很多，我們可以在主程序上加上
@MapperScan("com.test.demo.mapper")
也可以指定多個包