springboot-简单集成mybatis

Posted 2020-12-24 流世幻羽

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;
    }
}