[Java知识库]spring-boot框架实现数据库的增删改查

想对比与ssm框架 spring-boot也是基于ssm框架开发的 相比于ssm springboot书写起来更简单方便 ssm繁多的xml文件 在springboot中都可以被优化掉 通过大量的便签来实现多层结构之间的关联代码更简单易懂

创建一个maven工程

?导入jar包

<?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 https://maven.apache.org/xsd/maven-4.0.0.xsd">
    <modelVersion>4.0.0</modelVersion>
    <groupId>com.njbdqn</groupId>
    <artifactId>mysqb2</artifactId>
    <version>0.0.1-SNAPSHOT</version>
    <name>mysqb2</name>
    <description>Demo project for Spring Boot</description>

    <properties>
        <java.version>1.8</java.version>
        <project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
        <project.reporting.outputEncoding>UTF-8</project.reporting.outputEncoding>
        <spring-boot.version>2.3.7.RELEASE</spring-boot.version>
    </properties>

    <dependencies>
        <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>2.1.4</version>
        </dependency>

        <dependency>
            <groupId>com.oracle.database.jdbc</groupId>
            <artifactId>ojdbc8</artifactId>
            <scope>runtime</scope>
        </dependency>
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-test</artifactId>
            <scope>test</scope>
            <exclusions>
                <exclusion>
                    <groupId>org.junit.vintage</groupId>
                    <artifactId>junit-vintage-engine</artifactId>
                </exclusion>
            </exclusions>
        </dependency>
    </dependencies>

    <dependencyManagement>
        <dependencies>
            <dependency>
                <groupId>org.springframework.boot</groupId>
                <artifactId>spring-boot-dependencies</artifactId>
                <version>${spring-boot.version}</version>
                <type>pom</type>
                <scope>import</scope>
            </dependency>
        </dependencies>
    </dependencyManagement>

    <build>
        <plugins>
            <plugin>
                <groupId>org.apache.maven.plugins</groupId>
                <artifactId>maven-compiler-plugin</artifactId>
                <version>3.8.1</version>
                <configuration>
                    <source>1.8</source>
                    <target>1.8</target>
                    <encoding>UTF-8</encoding>
                </configuration>
            </plugin>
            <plugin>
                <groupId>org.springframework.boot</groupId>
                <artifactId>spring-boot-maven-plugin</artifactId>
                <version>2.3.7.RELEASE</version>
                <configuration>
                    <mainClass>com.njbdqn.mysqb2.Mysqb2Application</mainClass>
                </configuration>
                <executions>
                    <execution>
                        <id>repackage</id>
                        <goals>
                            <goal>repackage</goal>
                        </goals>
                    </execution>
                </executions>
            </plugin>
        </plugins>
    </build>

</project>

书写实体类

public class Bank {
    private int id;
    private String name;
    private int money;

    public int getId() {
        return id;
    }

    public void setId(int id) {
        this.id = id;
    }

    public String getName() {
        return name;
    }

    public void setName(String name) {
        this.name = name;
    }

    public int getMoney() {
        return money;
    }

    public void setMoney(int money) {
        this.money = money;
    }
}

定义方法接口

public interface BankDAO {
    public List<Bank> findAll();
    public void insertBank(Bank bank);
    public void deletBank(int id);
    public void updateBank(Bank bank);

}

控制层

@RestController
public class BankCtrl {
    @Resource
    private BankService bankService;

    @RequestMapping("/all")
    public List<Bank> find(){
        return bankService.fall();
    }
    @RequestMapping("/insert")
    public String insert(@RequestBody Bank bank){
        bankService.insert(bank);
        return "ok";
    }
    @RequestMapping("/del")
    public String del(@RequestBody int id){
        bankService.del(id);
        return "ok";
    }
    @RequestMapping("/update")
    public String up(@RequestBody Bank bank){
        bankService.update(bank);
        return "ok";
    }
}

服务层

@Service
@Transactional //开启自动事务
public class BankService {
    @Resource
    private BankDAO bdao;
    public List<Bank> fall(){
        return bdao.findAll();
    }
    public void insert(Bank bank){
        bdao.insertBank(bank);
    }
    public void del(int id){
        bdao.deletBank(id);
    }
    public void update(Bank bank){
        bdao.updateBank(bank);
    }
}

测试层

@SpringBootApplication
@MapperScan("com.baoluo.mysqb2.dao")
public class Mysqb2Application {

    public static void main(String[] args) {

        SpringApplication.run(Mysqb2Application.class, args);
    }

}

bank.xml

<?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.baoluo.mysqb2.dao.BankDAO">
    <select id="findAll" resultType="bank">
        select * from bank
    </select>
    <insert id="insertBank" parameterType="bank">
        insert into bank values (#{id},#{name},#{money})
    </insert>
    <delete id="deletBank" parameterType="bank">
        delete from bank where id=#{id}
    </delete>
    <update id="updateBank" parameterType="bank">
        update bank
        <set>
            <if test="name!=null">name=#{name},</if>
            <if test="money!=0">name=#{money}</if>
        </set>
        <where>
            <if test="id !=0">
                id=#{id}
            </if>
        </where>
    </update>
</mapper>

application.yml

spring:
  datasource:
    driver-class-name: oracle.jdbc.driver.OracleDriver
    url: jdbc:oracle:thin:@192.168.80.171:1521:orcl
    username: cm
    password: ok


mybatis:
  mapper-locations: classpath*:mapper/*.xml
  type-aliases-package: com.njbdqn.mysqb2.entity

server:
  port: 8081

然后启动程序

?spring-boot自带tomcat也不需要配置

然后打开网页

输入http://localhost:8081/all

?就可以看到数据库数据了 是不是比ssm简单多了

但是ssm还是根本? 框架会变但是ssm底层架构不会变