Spring Boot 2.0 整合 Mybatis分为两种模式。一种是XML配置，一种是注解。
一、XML配置方式整合
1.1 依赖文件
<?xml version="1.0" encoding="UTF-8"?>
<project xmlns="http://maven.apache.org/POM/4.0.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">
<modelVersion>4.0.0</modelVersion>
<groupId>priv.simon</groupId>
<artifactId>mybatis</artifactId>
<version>0.0.1-SNAPSHOT</version>
<packaging>jar</packaging>
<name>mybatis</name>
<description>Demo project for Spring Boot</description>
<parent>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-parent</artifactId>
<version>2.1.0.RELEASE</version>
<relativePath/> <!-- lookup parent from repository -->
</parent>
<properties>
<project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
<project.reporting.outputEncoding>UTF-8</project.reporting.outputEncoding>
<java.version>1.8</java.version>
</properties>
<dependencies>
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-jdbc</artifactId>
</dependency>
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-web</artifactId>
</dependency>
<dependency>
<groupId>org.mybatis.spring.boot</groupId>
<artifactId>mybatis-spring-boot-starter</artifactId>
<version>1.3.2</version>
</dependency>
<!-- alibaba的druid数据库连接池 -->
<dependency>
<groupId>com.alibaba</groupId>
<artifactId>druid-spring-boot-starter</artifactId>
<version>1.1.10</version>
</dependency>
<!-- 分页插件 -->
<dependency>
<groupId>com.github.pagehelper</groupId>
<artifactId>pagehelper-spring-boot-starter</artifactId>
<version>1.2.10</version>
</dependency>
<dependency>
<groupId>mysql</groupId>
<artifactId>mysql-connector-java</artifactId>
<scope>runtime</scope>
</dependency>
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-test</artifactId>
<scope>test</scope>
</dependency>
</dependencies>
<build>
<plugins>
<plugin>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-maven-plugin</artifactId>
</plugin>
</plugins>
</build>
</project>
在依赖中我们添加了分页插件的依赖。
1.2 配置文件
server:
port: 8080
spring:
datasource:
name: testdb
type: com.alibaba.druid.pool.DruidDataSource
#druid相关配置
druid:
#监控统计拦截的filters
filters: stat
driver-class-name: com.mysql.jdbc.Driver
#基本属性
url: jdbc:mysql://192.168.10.58:3306/testdb?useUnicode=true&characterEncoding=UTF-8&allowMultiQueries=true
username: root
password: 123456
#配置初始化大小/最小/最大
initial-size: 1
min-idle: 1
max-active: 20
#获取连接等待超时时间
max-wait: 60000
#间隔多久进行一次检测，检测需要关闭的空闲连接
time-between-eviction-runs-millis: 60000
#一个连接在池中最小生存的时间
min-evictable-idle-time-millis: 300000
validation-query: SELECT 'x'
test-while-idle: true
test-on-borrow: false
test-on-return: false
#打开PSCache，并指定每个连接上PSCache的大小。oracle设为true，mysql设为false。分库分表较多推荐设置为false
pool-prepared-statements: false
max-pool-prepared-statement-per-connection-size: 20
mybatis:
mapper-locations: classpath:mapper/*.xml
type-aliases-package: priv.simon.mybatis.model
#分页插件
pagehelper:
helperDialect: mysql
reasonable: true
supportMethodsArguments: true
params: count=countSql
1.3 创建表和实体
在数据库中执行下面的SQL创建表：
CREATE DATABASE testdb;
CREATE TABLE user(
userId INT NOT NULL PRIMARY KEY AUTO_INCREMENT,
userName VARCHAR(255) NOT NULL ,
password VARCHAR(255) NOT NULL ,
phone VARCHAR(255) NOT NULL
) ENGINE=INNODB AUTO_INCREMENT=1000 DEFAULT CHARSET=utf8;
对应在priv.simon.mybatis.model包下创建实体User：
public class User {
private Integer userId;
private String username;
private String password;
private String phone;
public Integer getUserId() {
return userId;
}
public void setUserId(Integer userId) {
this.userId = userId;
}
public String getUsername() {
return username;
}
public void setUsername(String username) {
this.username = username == null ? null : username.trim();
}
public String getPassword() {
return password;
}
public void setPassword(String password) {
this.password = password == null ? null : password.trim();
}
public String getPhone() {
return phone;
}
public void setPhone(String phone) {
this.phone = phone == null ? null : phone.trim();
}
}
1.4 创建查询接口mapper
在priv.simon.mybatis.mapper包下创建UserMapper
public interface UserMapper {
/**
* 插入数据
* @param record 数据记录
* @return 成功操作的记录数
*/
int insert(User record);
/**
* 查询所有用户
*
* @return 所有用户数据
*/
List <User> selectUsers();
}
1.5 创建service
在priv.simon.mybatis.service下创建IUserService接口
public interface IUserService {
/**
* 增添用户
*
* @param user 用户信息
*/
int addUser(User user);
/**
* 查询所有用户信息
*
* @param pageNum 页码
* @param pageSize 显示记录数
*/
PageInfo<User> findAllUser(int pageNum, int pageSize);
}
在priv.simon.mybatis.service.impl下创建IUserService的实现类UserService
@Service
public class UserService implements IUserService {
private final UserMapper userDao;
@Autowired
public UserService(UserMapper userDao) {
this.userDao = userDao;
}
@Override
public int addUser(User user) {
return userDao.insert(user);
}
@Override
public PageInfo <User> findAllUser(int pageNum, int pageSize) {
//将参数传给这个方法就可以实现物理分页了，非常简单。
PageHelper.startPage(pageNum, pageSize);
List <User> userDomains = userDao.selectUsers();
return new PageInfo(userDomains);
}
}
1.6 创建Controller
在priv.simon.mybatis.controller下创建UserController
@RestController
public class UserController {
@Autowired
private UserService userService;
@ResponseBody
@PostMapping("/addUser")
public int addUser(User user) {
return userService.addUser(user);
}
@ResponseBody
@GetMapping("/findAllUser")
public Object findAllUser(
@RequestParam(name = "pageNum", required = false, defaultValue = "1")
int pageNum,
@RequestParam(name = "pageSize", required = false, defaultValue = "10")
int pageSize) {
return userService.findAllUser(pageNum, pageSize);
}
}
1.7 启动类修改
在启动类上添加mapper扫描注解
@SpringBootApplication
@MapperScan("priv.simon.mybatis.mapper")
public class MybatisApplication {
public static void main(String[] args) {
SpringApplication.run(MybatisApplication.class, args);
}
}
二、注解方式整合
- 修改配置文件
注释mybatis.mapper-locations: classpath:mapper/*.xml配置。 - 修改
UserMapper.java
public interface UserMapper {
/**
* 插入数据
* @param record 数据记录
* @return 成功操作的记录数
*/
@Insert("INSERT INTO user(userId,username,password,phone}) VALUES(#{userId}, #{username}, #{password},#{phone})")
int insert(User record);
/**
* 查询所有用户
*
* @return 所有用户数据
*/
@Select("SELECT * FROM user")
@Results({
@Result(property = "userId",column = "userId"),
@Result(property = "username",column = "username"),
@Result(property = "password",column = "password"),
@Result(property = "phone",column = "phone")
})
List <User> selectUsers();
}
- @Select 是查询类的注解，所有的查询均使用这个
- @Result 修饰返回的结果集，关联实体类属性和数据库字段一一对应，如果实体类* 属性和数据库属性名保持一致，就不需要这个属性来修饰。
- @Insert 插入数据库使用，直接传入实体类会自动解析属性到对应的值
其它地方无需修改。
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