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springboot-curd基于mybatis項目搭建的示例分析，相信很多沒有經驗的人對此束手無策，為此本文總結了問題出現的原因和解決方法，通過這篇文章希望你能解決這個問題。
項目結構：
pom.xml文件：
<parent> <groupId>org.springframework.boot</groupId> <artifactId>spring-boot-starter-parent</artifactId> <version>2.2.2.RELEASE</version> <relativePath/> </parent> <groupId>com.liuyang</groupId> <artifactId>springbootcurd</artifactId> <version>0.0.1-SNAPSHOT</version> <name>springbootcurd</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.mybatis.spring.boot</groupId> <artifactId>mybatis-spring-boot-starter</artifactId> <version>2.2.1</version> </dependency> <!-- 測試依賴--> <dependency> <groupId>junit</groupId> <artifactId>junit</artifactId> <version>4.13</version> <scope>test</scope> </dependency> <!-- springboot 分頁插件 --> <dependency> <groupId>com.github.pagehelper</groupId> <artifactId>pagehelper-spring-boot-starter</artifactId> <version>1.2.13</version> </dependency> <!-- mysql 驅動 --> <dependency> <groupId>mysql</groupId> <artifactId>mysql-connector-java</artifactId> <version>8.0.25</version> </dependency> <!-- c3p0 數據源 --> <dependency> <groupId>com.mchange</groupId> <artifactId>c3p0</artifactId> <version>0.9.5.5</version> </dependency> <!--StringUtils--> <dependency> <groupId>org.apache.commons</groupId> <artifactId>commons-lang3</artifactId> </dependency> <dependency> <groupId>org.springframework.boot</groupId> <artifactId>spring-boot-devtools</artifactId> <!--當前這個項目被繼承之后，這個不向下傳遞--> <optional>true</optional> </dependency> <dependency> <groupId>org.springframework.data</groupId> <artifactId>spring-data-commons</artifactId> <version>2.2.3.RELEASE</version> </dependency> </dependencies> <build> <plugins> <plugin> <groupId>org.springframework.boot</groupId> <artifactId>spring-boot-maven-plugin</artifactId> </plugin> </plugins> </build>
yml
## 數據源配置 spring: ## 熱部署配置 devtools: restart: enabled: true # 設置重啟的目錄，添加目錄的文件需要restart additional-paths: src/main/java # 解決項目自動重新編譯后接口報404的問題 poll-interval: 3000 quiet-period: 1000 datasource: type: com.mchange.v2.c3p0.ComboPooledDataSource driver-class-name: com.mysql.cj.jdbc.Driver url: jdbc:mysql://127.0.0.1:3306/springboot_mybatis?useUnicode=true&characterEncoding=utf8&useSSL=false&serverTimezone=GMT%2B8 username: root password: 123456 ##視圖的配置 freemarker: template-loader-path: classpath*:/views/ charset: UTF-8 content-type: text/html cache: false suffix: .ftl ## mybatis 配置 mybatis: #映射文件的存放路徑 mapper-locations: classpath*:/mapper/*.xml type-aliases-package: com.liuyang.bean,com.liuyang.vo,com.liuyang.query configuration: ## 下劃線轉駝峰配置 map-underscore-to-camel-case: true ## pageHelper pagehelper: helper-dialect: mysql ## 顯示dao 執行sql語句 logging: level: com: xxxx: mapper: debug
bean
private Integer userId; private String userName; private String userPwd;
mapper
public interface Usermapper {
public User selectuserbyid(Integer id);
public User selectUserByName(String userName);
// 注意返回的類型
public int insertUser(User user);
// 根據id進行刪除數據
public int deleteUserById(int userId);
//條件查詢
public List<User> selectUserByItem(UserQuery userQuery);
}mapping.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.liuyang.mapper.Usermapper">
<select id="selectuserbyid" parameterType="int" resultType="com.liuyang.bean.User">
select * from t_user where user_id=#{userId}
</select>
<select id="selectUserByName" parameterType="String" resultType="com.liuyang.bean.User">
select * from t_user where user_name=#{userName}
select * from t_user where user_name=
</select>
<insert id="insertUser">
insert into t_user(user_name,user_pwd) values(#{userName},#{userPwd});
</insert>
<!--刪除一條-->
<delete id="deleteUserById" parameterType="int">
delete from t_user where user_id=#{userId}
</delete>
<!--條件查詢-->
<select id="selectUserByItem" resultType="com.liuyang.bean.User">
select * from t_user
<where>
<if test="userName!=null">
user_name like "%${userName}%"
</if>
</where>
</select>
</mapper>controller
@RestController
public class Usercontroller {
@Resource
private Usermapper usermapper;
@GetMapping("one/{id}")
public User sayUser(@PathVariable Integer id) {
System.out.println( id + "<<<" );
//根據ID查詢
User user = usermapper.selectuserbyid(id);
return user;
}
// 沒有檢測重復
@GetMapping("userOne/{name}")
public User sayUserOne(@PathVariable String name) {
System.out.println( name + "<<<" );
//根據ID查詢
User user = usermapper.selectUserByName( name );
//user--json
return user;
}
@PutMapping("add")
public int sayAdd(User user) {
System.out.println( user + "<<<" );
//根據ID查詢
return usermapper.insertUser( user );
}
@DeleteMapping("delete/{userId}")
public int sayDel(@PathVariable Integer userId) {
System.out.println( userId + "<<<" );
//根據ID查詢
return usermapper.deleteUserById( userId );
}
@GetMapping("query")
public java.util.List<User> sayDel(UserQuery userQuery) {
System.out.println( userQuery + "<<<" );
//分頁的集合數據
return usermapper.selectUserByItem( userQuery );
}
}query
public class UserQuery {
private Integer pageNum=1;
private Integer pageSize=1;
private String userName;以上只是簡單的實現了增刪改查 如果發生了插入或者是刪除異常，我們就應該會自定義全局異常去捕獲出現的問題
新增類 service 主要進行的業務的處理
Userservice
public interface Userservice {
public User queryUserById(Integer userId);
public User queryUserByName(String userName);
public void saveUser(User user);
public void changeUser(User user);
//刪除一條
public void removeUserById(Integer userId);
//查詢用戶信息
public PageInfo<User> queryUserByPage(UserQuery userQuery);
}UserserviceImpl
@Service
public class UserserviceImpl implements Userservice {
@Resource
private Usermapper usermapper;
// 查詢都是用的User返回類型
@Override
public User queryUserById(Integer userId) {
return usermapper.selectuserbyid( userId );
}
@Override
public User queryUserByName(String userName) {
return usermapper.selectUserByName( userName );
}
//增加操作
/***
* 需要用戶名 AssertUtil
* 用戶密碼
* 用戶是否存在
* 添加用戶是否成功
* @param user
*/
@Override
public void saveUser(User user) {
//驗證用戶名
AssertUtil.isTrue( StringUtils.isBlank(user.getUserName()),"用戶名不能為空");
//用戶密碼
AssertUtil.isTrue(StringUtils.isBlank(user.getUserPwd()),"用戶密碼不能為空");
//用戶是否存在
User temp = usermapper.selectUserByName(user.getUserName());
AssertUtil.isTrue(temp!=null,"用戶已經存在");
//用戶添加是否成功
AssertUtil.isTrue(usermapper.insertUser(user)<1,"添加失敗了");
}
// 修改操作
/****
* 用戶名不為空
* 用戶密碼不為空
* 用戶不存在
* 用戶修改操作失敗
*
* @param user
*/
@Override
public void changeUser(User user) {
AssertUtil.isTrue( StringUtils.isBlank( user.getUserName() ),"用戶名不為空" );
AssertUtil.isTrue( StringUtils.isBlank( user.getUserPwd() ),"密碼不為空" );
User temp = usermapper.selectuserbyid(user.getUserId());
AssertUtil.isTrue( temp == null,"用戶不存在");
AssertUtil.isTrue( usermapper.updateUser(user)<1,"修改失敗了");
}
/****
* 刪除是的id是否還存在
* 刪除失敗
* @param userId
*/
@Override
public void removeUserById(Integer userId) {
AssertUtil.isTrue( userId==null|| null==usermapper.selectuserbyid( userId ),"待刪除數據不存在" );
AssertUtil.isTrue( usermapper.deleteUserById( userId )<1,"刪除失敗" );
}
/**
* 分頁參數傳遞了兩個變量 一個是起始位置 一個是一頁有多行數據
*
* @param userQuery
* @return
*/
@Override
public PageInfo<User> queryUserByPage(UserQuery userQuery) {
PageHelper.startPage( userQuery.getPageNum(),userQuery.getPageSize());
List<User> ulist = usermapper.selectUserByItem( userQuery );
PageInfo<User> plist =new PageInfo<User>(ulist);
return plist;
}
}
新增類 用來校驗數據數據是否有誤
AssertUtil
public class AssertUtil {
/**
*
* @param flag 參數
* @param msg 信息
* flag=true
* 拋出異常，自定義
*/
public static void isTrue(Boolean flag,String msg){
if(flag){
throw new ParamException(msg);
}
}
}ParamException 自定義異常類
public class ParamException extends RuntimeException{
private Integer code=300;
private String msg="參數異常";
public ParamException() {
super("參數異常");
}
public ParamException(Integer code) {
super("參數異常");
this.code=code;
}
public ParamException(String msg) {
super(msg);
this.msg=msg;
}
public ParamException(Integer code,String msg) {
super(msg);
this.msg=msg;
this.code=code;
}
public Integer getCode() {
return code;
}
public void setCode(Integer code) {
this.code = code;
}
public String getMsg() {
return msg;
}
public void setMsg(String msg) {
this.msg = msg;
}
}
把數據狀態碼 狀態數據存在在Resultinfo所創建的對象中
ResultInfo
public class ResultInfo {
private Integer code=200;
private String msg="操作成功";
private Object object;
public ResultInfo() {
}
public Integer getCode() {
return code;
}
public void setCode(Integer code) {
this.code = code;
}
public String getMsg() {
return msg;
}
public void setMsg(String msg) {
this.msg = msg;
}
public Object getObject() {
return object;
}
public void setObject(Object object) {
this.object = object;
}
@Override
public String toString() {
return "ResultInfo{" +
"code=" + code +
", msg='" + msg + '\'' +
", object=" + object +
'}';
}
}更新傳遞的事json數據：
分頁查詢：
springboot一種全新的編程規范，其設計目的是用來簡化新Spring應用的初始搭建以及開發過程，SpringBoot也是一個服務于框架的框架，服務范圍是簡化配置文件。
看完上述內容，你們掌握springboot-curd基于mybatis項目搭建的示例分析的方法了嗎？如果還想學到更多技能或想了解更多相關內容，歡迎關注億速云行業資訊頻道，感謝各位的閱讀！
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