SpringBoot构建微服务实战 之 整合Mybatis(一)

SpringBoot构建微服务实战 之 整合Mybatis

SpringBoot整合 Mybatis 主要有两种主流的方法，一是基于注解的整合，二是基于配置的整合。本章我们学习一下SpringBoot 基于注解整合 Mybatis。

新建Maven项目



添加依赖和修改pom.xml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.sstps.springBoot</groupId>
<artifactId>Martket</artifactId>
<version>0.0.1-SNAPSHOT</version>
<packaging>war</packaging>

<properties>
<project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
<Maven.compiler.source>1.8</Maven.compiler.source>
<Ma
4000
ven.compiler.target>1.8</Maven.compiler.target>
</properties>

<dependencyManagement>
<dependencies>
<!-- https://mvnrepository.com/artifact/org.springframework.boot/spring-boot-dependencies -->
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-dependencies</artifactId>
<version>1.5.8.RELEASE</version>
<type>pom</type>
<scope>import</scope>
</dependency>
</dependencies>
</dependencyManagement>

<dependencies>

<!-- SpringBoot starts -->
<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.springframework.boot</groupId>
<artifactId>spring-boot-starter</artifactId>
</dependency>
<!-- SpringBoot ends -->

<!-- mysql starts -->
<dependency>
<groupId>mysql</groupId>
<artifactId>mysql-connector-java</artifactId>
</dependency>
<dependency>
<groupId>org.mybatis</groupId>
<artifactId>mybatis</artifactId>
<version>3.4.1</version>
</dependency>
<!-- mysql ends -->

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

<!-- junit starts -->
<dependency>
<groupId>junit</groupId>
<artifactId>junit</artifactId>
<scope>test</scope>
</dependency>
<!-- junit ends -->

</dependencies>
</project>

配置数据源 application.properties

spring.datasource.url=jdbc:mysql:///sstps_product?useSSL=false&serverTimezone=UTC
spring.datasource.username=root
spring.datasource.password=bai5331359
spring.datasource.driver-class-name=com.mysql.jdbc.Driver

建库建表 product.sql

create database sstps_product default charset uft8;

create table products(pid int not null primary key auto_increment,pname varchar(200),type varchar(50),price double,createTime timestamp)

新建Product 实体 Product.java

package com.sstps.market.entity;

import java.security.Timestamp;

import org.springframework.stereotype.Component;

@Component
public class Product {

private Integer pid;
private String pname;
private String type;
private Double price;
private Timestamp createTime;

public Integer getPid() {
return pid;
}

public void setPid(Integer pid) {
this.pid = pid;
}

public String getPname() {
return pname;
}

public void setPname(String pname) {
this.pname = pname;
}

public String getType() {
return type;
}

public void setType(String type) {
this.type = type;
}

public Double getPrice() {
return price;
}

public void setPrice(Double price) {
this.price = price;
}

public Timestamp getCreateTime() {
return createTime;
}

public void setCreateTime(Timestamp createTime) {
this.createTime = createTime;
}

@Override
public String toString() {
return "Product [pid=" + pid + ", pname=" + pname + ", type=" + type + ", price=" + price + ", createTime="
+ createTime + "]";
}
}

新建Mapper ProductMapper.java

package com.sstps.market.mapper;

import java.util.List;

import org.apache.ibatis.annotations.Delete;
import org.apache.ibatis.annotations.Insert;
import org.apache.ibatis.annotations.Mapper;
import org.apache.ibatis.annotations.Select;
import org.apache.ibatis.annotations.Update;
import com.sstps.market.entity.Product;

@Mapper
public interface ProductMapper {

@Insert("insert into products (pname,type,price) values(#{pname},#{type},#{price})")
public Integer addProduct(Product product);

@Delete("delete from products where pid =#{arg1}")
public Integer deleteById(int pid);

@Update("update products set pname=#{pname},type=#{type},price=#{price} where pid=#{pid}")
public Integer updateProduct(Product product);

@Select("select * from products where pid =#{arg1}")
public Product getProductById(Integer id);

@Select("select * from products oredr by pid desc")
public  List<Product> queryProductByList();

}

代码解读：

@Mapper MyBatis 集成SpringBoot 注解 使用该注解Spring 会为Mybaits生成相应实体类。

@Insert/@update/@Delete/@Select:MyBatis Mapper接口注解。

App.java

package com.sstps.market;

import org.springframework.boot.SpringApplication;
import org.springframework.boot.autoconfigure.SpringBootApplication;
import org.springframework.context.ConfigurableApplicationContext;
import org.springframework.transaction.annotation.Transactional;

import com.sstps.market.entity.Product;
import com.sstps.market.mapper.ProductMapper;

@SpringBootApplication
public class App {

@Transactional
public static void main(String[] args) {

ConfigurableApplicationContext context = SpringApplicat
b4c4
ion.run(App.class, args);
ProductMapper productMapper = context.getBean(ProductMapper.class);

Product product = context.getBean(Product.class);

product.setPname("SpringBootDemo");
product.setType("LearningMatires");
product.setPrice(105.00);

productMapper.addProduct(product);

context.close();

}

}

结果

小结

SpringBoot 整合Mybatis 需要相应的jar 包，具体请看 pom.xml 代码和注解。同时我们也许知道 SpringBoot 与 Mybatis 的关联jar 是由 Mybatis 方提供的(谁叫Spring 牛逼呢~~)。

基于注解整合Mybatis 时只需要引入@Mapper 注解并在相应的抽象方法上添加 @Insert/@update/@Delete/@Select 即可完成Mybatis 的实体类的注入和Mapper关系的建立(实际由mybatis-spring-boot-starter\1.3.0\mybatis-spring-boot-starter-1.3.0.jar 封装整个映射的实现和抽象)。

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