SSM框架入門學習記錄

SSM框架入門學習記錄

//專案結構


包名多種多樣，命名習慣問題，

流程：Controller(接受請求)——>Service（biz）（bl)(寫業務函式介面)(impl實作)——>Mapper（dao）(data)(介面)——>mapper.xml(寫sql)

impl檔案夾，寫函式實作
entity物體類（pojo）//有的命名pojo
Mapper：將物體映射到資料庫的介面
Dao： Data Access Objects 連接資料庫

logo4j2.xml(日志處理的組態檔)

controller呼叫service，service呼叫mapper；
控制層要@Controller，服務層@Service，mapper@Mapper

每個mapper對應一個mapper.xml
mapper.xml檔案中：我們要做到mapper namespace路徑和mapper介面路徑一致

@ResponseBody//自動轉換成相應型別回傳給前端

@RequestBody接收json資料
@RequestParam接收引數
可一起使用

mapper寫介面，mapper.xml寫實作，id對應函式名，

添加完新依賴，動了pom檔案之后，都install一下，
專案用utf-8編碼，

application 內嵌tomcat服務，不用另外安裝tomcat

各種配置使用注解配置，不用xml配置，

Mybatis：
<?xml version="1.0" encoding="UTF-8" ?>
<!DOCYYPE mapper PUBLIC "-//mybatis.org//DTO Mapper 38//EN"
        "http://mybatis.org/dtd/mybatis-3-mapper.dtd">
<mapper namespace="寫對應Mapper包的路徑">
    <insert id="寫對應Mapper介面的函式名" parameterType="寫傳入的引數型別，可省略" resultType="">
       寫SQL陳述句，#{傳入的引數名}
    </insert>

<resultMap id="Teacher" type="">//回傳不規則資料集，自定義
</mapper>```

```xml

//yml組態檔
server:
  port: 8080//埠

spring:
  datasource:
    username: root
    password: hfut2018214813
    #上面用戶名和密碼要改，下面資料庫名字也要改
    url: jdbc:mysql://localhost:3306/paikaosystem?serverTimezone=CTT&characterEncoding=UTF-8&useSSL=false
    driver-class-name: com.mysql.cj.jdbc.Driver

mybatis:
  mapper-locations: classpath:mapping/*Mapper.xml
  type-aliases-package: com.example.demo.entity

#showSql
logging:
  level:
    com:
      example:
        mapper : debug

//pom.xml依賴配置
<?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>
    <parent>
        <groupId>org.springframework.boot</groupId>
        <artifactId>spring-boot-starter-parent</artifactId>
        <version>2.3.2.RELEASE</version>
        <relativePath/> <!-- lookup parent from repository -->
    </parent>
    <groupId>com.example</groupId>
    <artifactId>demo</artifactId>
    <version>0.0.1-SNAPSHOT</version>
    <name>demo</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-data-jdbc</artifactId>
        </dependency>
        <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.mybatis.spring.boot</groupId>
            <artifactId>mybatis-spring-boot-starter</artifactId>
            <version>2.1.3</version>
        </dependency>

        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-devtools</artifactId>
            <scope>runtime</scope>
            <optional>true</optional>
        </dependency>
        <dependency>
            <groupId>mysql</groupId>
            <artifactId>mysql-connector-java</artifactId>
            <scope>runtime</scope>
        </dependency>
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-configuration-processor</artifactId>
            <optional>true</optional>
        </dependency>
        <dependency>
            <groupId>org.projectlombok</groupId>
            <artifactId>lombok</artifactId>
            <optional>true</optional>
        </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>
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-test</artifactId>
            <version>2.3.1.RELEASE</version>
            <scope>test</scope>
        </dependency>
    </dependencies>

    <build>
        <plugins>
            <plugin>
                <groupId>org.springframework.boot</groupId>
                <artifactId>spring-boot-maven-plugin</artifactId>
            </plugin>
        </plugins>
    </build>

</project>