@MapperScan注解需要在pom.xml导入啥
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如下：
<?xml version="1.0" encoding="UTF-8"?>
<!DOCTYPE generatorConfiguration
PUBLIC "-//mybatis.org//DTD MyBatis Generator Configuration 1.0//EN"
"http://mybatis.org/dtd/mybatis-generator-config_1_0.dtd">
<generatorConfiguration>
<properties resource="application.properties"/>
<context id="mysql" targetRuntime="MyBatis3Simple" defaultModelType="flat">
<property name="beginningDelimiter" value="`"/>
在SpringBoot中集成MyBatis，可以在mapper接口上添加@Mapper注解，将mapper注入到Spring,但是如果每一给mapper都添加@mapper注解会很麻烦，这时可以使用@MapperScan注解来扫描包。
经测试发现，@MapperScan注解只会扫描包中的接口，不会扫描类，所以可以在包中写Provider类。
@MapperScan("com.demo.mapper")：扫描指定包中的接口。
@MapperScan("com.demo.*.mapper")：一个*代表任意字符串，但只代表一级包,比如可以扫到com.demo.aaa.mapper,不能扫到com.demo.aaa.bbb.mapper.
@MapperScan("com.demo.**.mapper")：两个*代表任意个包,比如可以扫到。com.demo.aaa.mapper,也可以扫到com.demo.aaa.bbb.mapper.
参考技术A <?xml version="1.0" encoding="UTF-8"?><!DOCTYPE generatorConfiguration
PUBLIC "-//mybatis.org//DTD MyBatis Generator Configuration 1.0//EN"
"http://mybatis.org/dtd/mybatis-generator-config_1_0.dtd">
<generatorConfiguration>
<properties resource="application.properties"/>
<context id="Mysql" targetRuntime="MyBatis3Simple" defaultModelType="flat">
<property name="beginningDelimiter" value="`"/> 参考技术B <dependency>
<groupId>org.mybatis</groupId>
<artifactId>mybatis-spring</artifactId>
<version>2.0.0</version>
</dependency>
缺少一个mybatis-spring的包
springboot-简单集成mybatis
Spring Boot 集成Mybatis:
---------------------------------------
1、新建一个新的Maven Project;
2、需要在pom.xml文件添加相应的依赖，
比如：mysql驱动；
PageHelper分页插件，需要版本号；
3、编写启动类，大部分和之前的代码是一样的，需要的注意的是：
需要添加一个注解@MapperScan --指定MyBatis持久类的位置；
4、编写一个测试的实体类Student;
5、编写一个StudentMapper,使用@Select和@Save进行数据库操作；
使用@Options配置返回的主键信息；
6、编写StudentService;
7、编写StudentController;
8、添加分页配置信息，需要添加一个MyBatisConfiguration;
9、使用PageHelper.startPage(pageNum,pageSize)进行分页；
1.pom文件
<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>com.it.huanyu</groupId>
<artifactId>spring-boot-mybatis1</artifactId>
<version>0.0.1-SNAPSHOT</version>
<packaging>jar</packaging>
<name>spring-boot-mybatis1</name>
<url>http://maven.apache.org</url>
<!-- spring boot parent节点，引入这个之后，在下面和spring boot相关的就不需要引入版本了; -->
<parent>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-parent</artifactId>
<version>1.4.1.RELEASE</version>
</parent>
<properties>
<project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
<!-- 指定一下jdk的版本 ，这里我们使用jdk 1.8 ,默认是1.6 -->
<java.version>1.8</java.version>
</properties>
<dependencies>
<!-- web支持: 1、web mvc; 2、restful; 3、jackjson支持; 4、aop ........ -->
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-web</artifactId>
</dependency>
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-devtools</artifactId>
<optional>true</optional>
<scope>true</scope>
</dependency>
<!-- mysql 数据库驱动. -->
<dependency>
<groupId>mysql</groupId>
<artifactId>mysql-connector-java</artifactId>
</dependency>
<!-- spring-boot mybatis依赖： 请不要使用1.0.0版本，因为还不支持拦截器插件， 1.1.1 是博主写帖子时候的版本，大家使用最新版本即可 -->
<dependency>
<groupId>org.mybatis.spring.boot</groupId>
<artifactId>mybatis-spring-boot-starter</artifactId>
<version>1.1.1</version>
</dependency>
<!-- MyBatis提供了拦截器接口，我们可以实现自己的拦截器， 将其作为一个plugin装入到SqlSessionFactory中。 Github上有位开发者写了一个分页插件，我觉得使用起来还可以，挺方便的。
Github项目地址： https://github.com/pagehelper/Mybatis-PageHelper -->
<dependency>
<groupId>com.github.pagehelper</groupId>
<artifactId>pagehelper</artifactId>
<version>4.1.0</version>
</dependency>
<!-- 添加Spring-data-jpa依赖. -->
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-data-jpa</artifactId>
</dependency>
</dependencies>
<build>
<plugins>
<plugin>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-maven-plugin</artifactId>
<configuration>
<!--fork : 如果没有该项配置，devtools不会起作用，即应用不会restart -->
<fork>true</fork>
</configuration>
</plugin>
</plugins>
</build>
</project>
2.启动类
package com.it.huanyu.spring_boot_mybatis1;
import org.mybatis.spring.annotation.MapperScan;
import org.springframework.boot.SpringApplication;
import org.springframework.boot.autoconfigure.SpringBootApplication;
/**
* Hello world!
*
*/
@SpringBootApplication
@MapperScan("com.it.huanyu.*")
public class App
{
public static void main( String[] args )
{
System.err.println("hellowaa");
SpringApplication.run(App.class, args);
}
}
3.实体类
package com.it.huanyu.spring_boot_mybatis1;
import javax.persistence.Entity;
import javax.persistence.GeneratedValue;
import javax.persistence.GenerationType;
import javax.persistence.Id;
@Entity
public class Student {
@Id
@GeneratedValue(strategy=GenerationType.AUTO)
private Integer id;
private String name;
private String remarks;
public Integer getId() {
return id;
}
public void setId(Integer id) {
this.id = id;
}
public String getName() {
return name;
}
public void setName(String name) {
this.name = name;
}
public String getRemarks() {
return remarks;
}
public void setRemarks(String remarks) {
this.remarks = remarks;
}
}
4.数据库和jpa使用配置application.properties
######################################################## ###datasource ######################################################## spring.datasource.url = jdbc:mysql://localhost:3306/test spring.datasource.username = root spring.datasource.password = 123 spring.datasource.driverClassName = com.mysql.jdbc.Driver spring.datasource.max-active=20 spring.datasource.max-idle=8 spring.datasource.min-idle=8 spring.datasource.initial-size=10 ######################################################## ### Java Persistence Api -- Spring jpau7684u914Du7F6Eu4FE1u606F. ######################################################## # Specify the DBMS spring.jpa.database = MYSQL # Show or not log for each sql query spring.jpa.show-sql = true # Hibernate ddl auto (create, create-drop, update) spring.jpa.hibernate.ddl-auto = update # Naming strategy #[org.hibernate.cfg.ImprovedNamingStrategy #org.hibernate.cfg.DefaultNamingStrategy] spring.jpa.hibernate.naming-strategy = org.hibernate.cfg.ImprovedNamingStrategy # stripped before adding them to the entity manager) spring.jpa.properties.hibernate.dialect = org.hibernate.dialect.MySQL5Dialect
5.StudentMapper
package com.it.huanyu.spring_boot_mybatis1;
import java.util.List;
import org.apache.ibatis.annotations.Insert;
import org.apache.ibatis.annotations.Options;
import org.apache.ibatis.annotations.Select;
public interface StudentMapper {
@Select("select *from Student where name like #{name}")
public List<Student> queryAll(String name) ;
@Select("select *from Student where id = #{id}")
public Student getById(Integer id);
@Select("select name from Student where id = #{id}")
public String getNameById(long id);
@Insert("insert into Student(name,remarks) values(#{name},#{remarks}) ")
@Options(useGeneratedKeys=true,keyProperty="id",keyColumn="id")
public void insert(Student stu);
}
6.StudentService
package com.it.huanyu.spring_boot_mybatis1;
import java.util.List;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Service;
import org.springframework.transaction.annotation.Transactional;
@Service
public class StudentService {
@Autowired
private StudentMapper studentMapper;
public List<Student> queryAll(String name) {
return studentMapper.queryAll(name);
}
@Transactional
public void insert(Student stu) {
studentMapper.insert(stu);
}
}
7.StudentController
package com.it.huanyu.spring_boot_mybatis1;
import java.util.List;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RestController;
import com.github.pagehelper.PageHelper;
@RestController
public class StudentController {
@Autowired
private StudentService studentService;
/**
* 查詢
*/
@RequestMapping("/queryAll")
public List<Student> queryAll(String name){
PageHelper.startPage(2, 1);
return studentService.queryAll(name);
}
/**
* Tina及
*/
@RequestMapping("/insert")
public Student insert(){
Student stu=new Student();
stu.setName("lisi");
stu.setRemarks("猪队友");
studentService.insert(stu);
return stu;
}
}
8.PageHelper分页插件
package com.it.huanyu.spring_boot_mybatis1;
import java.util.Properties;
import org.springframework.context.annotation.Bean;
import org.springframework.context.annotation.Configuration;
import com.github.pagehelper.PageHelper;
@Configuration
public class MyBatisConfiguration {
@Bean
public PageHelper pageHelper() {
System.out.println("MyBatisConfiguration.pageHelper()");
PageHelper pageHelper = new PageHelper();
Properties p = new Properties();
p.setProperty("offsetAsPageNum", "true");
p.setProperty("rowBoundsWithCount", "true");
p.setProperty("reasonable", "true");
pageHelper.setProperties(p);
return pageHelper;
}
}
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