本章详情
使用SpringBoot和MyBatis通过注解的方式操作数据库 使用SpringBoot和MyBatis通过XML配置文件的方式操作数据库
项目搭建
1. 打开idea,选择Create New Project
2.选择Spring Initializer,然后点击Next
3.填写组织,坐标等信息,然后点击Next
4.选择依赖Web,然后勾选Web,之后一直Next下去,直到项目构建完成
5.项目结构搭好之后,我们新建一些目录分为控制层,服务层,数据访问层,实体层,完整结构如下
6.由于我们要使用MyBatis操作数据库,所以需要添加一些依赖,完整的pom.xml文件如下
<?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>
<parent>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-parent</artifactId>
<version>2.1.3.RELEASE</version>
<relativePath/> <!-- lookup parent from repository -->
</parent>
<groupId>com.demo02</groupId>
<artifactId>demo_02</artifactId>
<version>0.0.1-SNAPSHOT</version>
<name>demo_02</name>
<description>Demo project for Spring Boot</description>
<properties>
<java.version>1.8</java.version>
</properties>
<dependencies>
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-web</artifactId>
</dependency>
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-test</artifactId>
<scope>test</scope>
</dependency>
<!--mybatis-spring适配器-->
<dependency>
<groupId>org.mybatis.spring.boot</groupId>
<artifactId>mybatis-spring-boot-starter</artifactId>
<version>1.1.1</version>
</dependency>
<!--mysql驱动包-->
<dependency>
<groupId>mysql</groupId>
<artifactId>mysql-connector-java</artifactId>
<version>5.1.30</version>
</dependency>
</dependencies>
<build>
<plugins>
<plugin>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-maven-plugin</artifactId>
</plugin>
</plugins>
</build>
</project>
7.接下来我们需要新建数据库以及生成实体,数据的建立我就不重复多说了,说一下使用idea快速生成实体(Product),数据库的sql脚本如下
#创建商品信息表
create table product
(
pid int primary key not null auto_increment COMMENT"商品编号",
pname varchar(50) COMMENT"商品名称",
pprice DECIMAL(10,2) COMMENT"商品价格",
ptime varchar(50) COMMENT"入库时间",
pcount int COMMENT"库存",
pstatus int COMMENT"商品状态" #0 代表下架,1代表上架
)COMMENT"商品信息表"
insert into product(pname,pprice,ptime,pcount,pstatus)VALUES
("苹果",11,"2019-10-1",11,1)
SELECT * from product
8.Database表示要连接的数据库名称,User表示用户名称,Password表示密码,然后点击Ok,然后选择你要生成实体的目录,生成完成之后基本结构就搭建好了
9.Product实体代码如下
package com.ssm.entity;
/*
* 商品实体类
* */
public class Product {
private long pid;//编号
private String pname;//名称
private double pprice;//价格
private String ptime;//入库时间
private long pcount;//数量
private long pstatus;//状态
//无参构造方法
public Product() {}
//带参构造方法
public Product(long pid, String pname, double pprice, String ptime, long pcount, long pstatus) {
this.pid = pid;
this.pname = pname;
this.pprice = pprice;
this.ptime = ptime;
this.pcount = pcount;
this.pstatus = pstatus;
}
public long getPid() {
return pid;
}
public void setPid(long pid) {
this.pid = pid;
}
public String getPname() {
return pname;
}
public void setPname(String pname) {
this.pname = pname;
}
public double getPprice() {
return pprice;
}
public void setPprice(double pprice) {
this.pprice = pprice;
}
public String getPtime() {
return ptime;
}
public void setPtime(String ptime) {
this.ptime = ptime;
}
public long getPcount() {
return pcount;
}
public void setPcount(long pcount) {
this.pcount = pcount;
}
public long getPstatus() {
return pstatus;
}
public void setPstatus(long pstatus) {
this.pstatus = pstatus;
}
@Override
public String toString() {
return "Product{" +
"pid=" + pid +
", pname='" + pname + '\'' +
", pprice=" + pprice +
", ptime='" + ptime + '\'' +
", pcount=" + pcount +
", pstatus=" + pstatus +
'}';
}
}
SpringBoot整合MyBatis基于注解
1.接下来,我们就需要配置一下连接数据库的配置文件,在application.xml中进行配置,applicaion.xml文件如下
#连接数据库的驱动
spring.datasource.driver-class-name=com.mysql.jdbc.Driver
#连接数据库的url
spring.datasource.url=jdbc:mysql://localhost:3306/ssm?characterEncoding=utf-8
#用户名
spring.datasource.username=root
#密码
spring.datasource.password=123456
2.现在我们就可以操作数据库了,编写ProductDao,ProductService,ProductImple,ProductController以及配置SpringBoot主程序,由于我们新建的包不是和SpringBoot主程序同级目录,所以无法扫描到。项目启动时,只有@SpringBootApplication 所在的包下面才能被扫描到,启动类是MainApplication.java, 也就是MainApplication.java类所在的这个包,而其他的controller和service以及mapper在其他的包里,所以并没有被扫描。所以我们需要配置一下
3.ProductDao文件如下
package com.ssm.dao;
import com.ssm.entity.Product;
import org.apache.ibatis.annotations.Select;
import java.util.List;
public interface ProductDao {
@Select("select * from product")
List<Product> findAllProduct();
}
4.ProductService文件如下
package com.ssm.service;
import com.ssm.entity.Product;
import java.util.List;
public interface ProductService {
List<Product> findAllProduct();
}
5.ProductImple文件如下
package com.ssm.service.imple;
import com.ssm.dao.ProductDao;
import com.ssm.entity.Product;
import com.ssm.service.ProductService;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Service;
import java.util.List;
@Service
public class ProductImple implements ProductService {
@Autowired
private ProductDao productDao;
@Override
public List<Product> findAllProduct() {
return productDao.findAllProduct();
}
}
6.ProductController文件如下
package com.ssm.controller;
import com.ssm.entity.Product;
import com.ssm.service.ProductService;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.web.bind.annotation.GetMapping;
import org.springframework.web.bind.annotation.RestController;
import java.util.List;
@RestController
public class ProductController {
@Autowired
private ProductService productService;
//查询全部的商品信息
@GetMapping("/product")
public List<Product> findAllProduct(){
return productService.findAllProduct();
}
}
7.SpringBoot主程序文件如下
package com.demo02.demo_02;
import org.mybatis.spring.annotation.MapperScan;
import org.springframework.boot.SpringApplication;
import org.springframework.boot.autoconfigure.SpringBootApplication;
import org.springframework.context.annotation.ComponentScan;
@SpringBootApplication
@ComponentScan(basePackages = {"com.ssm.controller","com.ssm.service"})
@MapperScan(basePackages = {"com.ssm.dao"})
public class Demo02Application {
public static void main(String[] args) {
SpringApplication.run(Demo02Application.class, args);
}
}
8.点击运行,在地址栏输入localhost:8080/product,出现如下结果
[{ "pid": 16, "prane": ”苹果","pprice": 11.0,"ptime": "2019-10-1" , " pcount": 11, " pstatus": 1}]
SpringBoot整合MyBatis基于XML配置文件
1.现在我们通过第二种方式操作数据库,我们先将application.xml中的配置文件全部注释,然后新建applicaion.yml,为什么要使用这种格式呢?因为这种方式方便简洁,官方也推荐我们使用这种类型,这是一些的相关格式。
server:
port: 8801
eureka:
client:
registerWithEureka: false
fetchRegistry: false
serviceUrl:
defaultZone: http://localhost:8801/eureka/
2.applicaion.yml配置如下
spring:
datasource:
driver-class-name: com.mysql.jdbc.Driver
url: jdbc:mysql://localhost:3306/ssm?characterEncoding=utf-8
username: root
password: 123456
mybatis:
typeAliasesPackage: com.ssm.entity
mapperLocations: classpath:mapper/*Mapper.xml
3.我们要通过xml的格式操作数据库也就是我们需要写Mapper.xml文件,在src/main/resources新建Mapper文件夹,然后新建ProductMapper.xml
4.ProductMapper.xml文件如下
<?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.ssm.dao.ProductDao">
<!--查询全部商品信息-->
<select id="findAllProduct" resultType="product">
select * from product
</select>
</mapper>
5.ProductDao文件如下
package com.ssm.dao;
import com.ssm.entity.Product;
import org.apache.ibatis.annotations.Select;
import java.util.List;
public interface ProductDao {
// @Select("select * from product")
List<Product> findAllProduct();
}
6.ProductService文件如下
package com.ssm.service;
import com.ssm.entity.Product;
import java.util.List;
public interface ProductService {
List<Product> findAllProduct();
}
7.ProductImple文件如下
package com.ssm.service.imple;
import com.ssm.dao.ProductDao;
import com.ssm.entity.Product;
import com.ssm.service.ProductService;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Service;
import java.util.List;
@Service
public class ProductImple implements ProductService {
@Autowired
private ProductDao productDao;
@Override
public List<Product> findAllProduct() {
return productDao.findAllProduct();
}
}
8.ProductController文件如下
package com.ssm.controller;
import com.ssm.entity.Product;
import com.ssm.service.ProductService;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.web.bind.annotation.GetMapping;
import org.springframework.web.bind.annotation.RestController;
import java.util.List;
@RestController
public class ProductController {
@Autowired
private ProductService productService;
//查询全部的商品信息
@GetMapping("/product")
public List<Product> findAllProduct(){
return productService.findAllProduct();
}
}
9.SpringBoot主程序文件如下
package com.demo02.demo_02;
import org.mybatis.spring.annotation.MapperScan;
import org.springframework.boot.SpringApplication;
import org.springframework.boot.autoconfigure.SpringBootApplication;
import org.springframework.context.annotation.ComponentScan;
@SpringBootApplication
@ComponentScan(basePackages = {"com.ssm.controller","com.ssm.service"})
@MapperScan(basePackages = {"com.ssm.dao"})
public class Demo02Application {
public static void main(String[] args) {
SpringApplication.run(Demo02Application.class, args);
}
}
10.运行,结果和之前的一样
[{ "pid": 16, "prane": ”苹果","pprice": 11.0,"ptime": "2019-10-1" , " pcount": 11, " pstatus": 1}]