'init'

.gitignore

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+HELP.md
+target/
+!.mvn/wrapper/maven-wrapper.jar
+!**/src/main/**/target/
+!**/src/test/**/target/
+**/temp
+
+### STS ###
+.apt_generated
+.classpath
+.factorypath
+.project
+.settings
+.springBeans
+.sts4-cache
+
+### IntelliJ IDEA ###
+.idea
+*.iws
+*.iml
+*.ipr
+
+### NetBeans ###
+/nbproject/private/
+/nbbuild/
+/dist/
+/nbdist/
+/.nb-gradle/
+build/
+!**/src/main/**/build/
+!**/src/test/**/build/
+
+### VS Code ###
+.vscode/
+
+### Vue ###
+**/node_modules
+**/.idea
+dist
+

doc/小白做毕设-第七节.md

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+# 第七节
+
+## postman下载
+
+https://app.getpostman.com/app/download/win64
+
+## postman测试接口
+
+![image-20220123214300191](https://gitee.com/xqnode/images/raw/master/imgs/image-20220123214300191.png)
+
+![](https://gitee.com/xqnode/images/raw/master/imgs/image-20220123223019361.png)
+
+## UserController.java
+
+```
+package com.qingge.springboot.controller;
+
+import com.qingge.springboot.entity.User;
+import com.qingge.springboot.mapper.UserMapper;
+import com.qingge.springboot.service.UserService;
+import org.springframework.beans.factory.annotation.Autowired;
+import org.springframework.web.bind.annotation.*;
+
+import java.util.List;
+
+@RestController
+@RequestMapping("/user")
+public class UserController {
+
+
+    @Autowired
+    private UserMapper userMapper;
+
+    @Autowired
+    private UserService userService;
+
+    // 新增和修改
+    @PostMapping
+    public Integer save(@RequestBody User user) {
+        // 新增或者更新
+        return userService.save(user);
+    }
+
+    // 查询所有数据
+    @GetMapping
+    public List<User> index() {
+        List<User> all = userMapper.findAll();
+        return all;
+    }
+
+    @DeleteMapping("/{id}")
+    public Integer delete(@PathVariable Integer id) {
+        return userMapper.deleteById(id);
+    }
+}
+
+```
+
+
+
+## UserMapper.java
+
+```
+package com.qingge.springboot.mapper;
+
+import com.qingge.springboot.entity.User;
+import org.apache.ibatis.annotations.*;
+
+import java.util.List;
+
+@Mapper
+public interface UserMapper {
+
+    @Select("SELECT * from sys_user")
+    List<User> findAll();
+
+    @Insert("INSERT into sys_user(username, password,nickname,email,phone,address) VALUES (#{username}, #{password}," +
+            " #{nickname}, #{email},#{phone}, #{address})")
+    int insert(User user);
+
+    int update(User user);
+
+    @Delete("delete from sys_user where id = #{id}")
+    Integer deleteById(@Param("id") Integer id);
+
+}
+```
+
+
+
+## UserService.java
+
+```
+package com.qingge.springboot.service;
+
+import com.qingge.springboot.entity.User;
+import com.qingge.springboot.mapper.UserMapper;
+import org.springframework.beans.factory.annotation.Autowired;
+import org.springframework.stereotype.Service;
+
+@Service
+public class UserService {
+
+    @Autowired
+    private UserMapper userMapper;
+
+    public int save(User user) {
+        if (user.getId() == null) {  // user没有id，则表示是新增
+            return userMapper.insert(user);
+        } else { // 否则为更新
+            return userMapper.update(user);
+        }
+    }
+
+}
+
+```
+
+
+
+## User.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.qingge.springboot.mapper.UserMapper">
+
+    <update id="update">
+        update sys_user
+        <set>
+            <if test="username != null">
+                username = #{username},
+            </if>
+<!--            <if test="password != null">-->
+<!--                password = #{password}-->
+<!--            </if>-->
+            <if test="nickname != null">
+                nickname = #{nickname},
+            </if>
+            <if test="email != null">
+                email = #{email},
+            </if>
+            <if test="phone != null">
+                phone = #{phone},
+            </if>
+            <if test="address != null">
+                address = #{address}
+            </if>
+        </set>
+        <where>
+            id = #{id}
+        </where>
+    </update>
+
+</mapper>
+
+```
+
+
+
+## application.yml
+
+```
+server:
+  port: 9090
+
+spring:
+  datasource:
+    driver-class-name: com.mysql.cj.jdbc.Driver
+    url: jdbc:mysql://localhost:3306/qing?serverTimezone=GMT%2b8
+    username: root
+    password: 123456
+mybatis:
+  mapper-locations: classpath:mapper/*.xml  #扫描所有mybatis的xml文件
+  configuration:
+    log-impl: org.apache.ibatis.logging.stdout.StdOutImpl
+
+```
+