SSM框架學習記錄

SSM框架學習記錄

//項目結構

流程：Controller(接受請求)——>Service（biz）（bl)(寫業務函數接口)(mpl實現)——>Mapper（dao）(data)(接口)——>mapper.xml(寫sql)

mpl文件夾，寫函數實現
entity實體類（pojo）
Mapper：將實體映射到數據庫的接口
Dao： Data Access Objects 連接數據庫

logo4j2.xml(日誌處理的配置文件)

controller調用service，service調用mapper；

每個mapper對應一個mapper.xml
mapper.xml文件中：我們要做到mapper namespace路徑和mapper接口路徑一致

@ResponseBody//自動轉換成相應類型返回給前端

@RequestBody接收json數據
@RequestParam接收參數
可一起使用

mapper寫接口，mapper.xml寫實現，id對應函數名。

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接口的函數名" parameterType="寫傳入的參數類型，可省略" resultType="">
       寫SQL語句，#{傳入的參數名}
    </insert>

<resultMap id="Teacher" type="">//返回不規則數據集，自定義
</mapper>```

```xml

//yml配置文件
server:
  port: 8080

spring:
  datasource:
    username: root
    password: hfut2018214813
    #上面用戶名和密碼要改，下面數據庫名字也要改
    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>