springboot+mybatis實現增刪改查
阿新 • • 發佈：2020-07-14
開發工具IDEA
二.新增依賴pom.xml
1 <?xml version="1.0" encoding="UTF-8"?> 2 <project xmlns="http://maven.apache.org/POM/4.0.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" 3 xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 https://maven.apache.org/xsd/maven-4.0.0.xsd"> 4View Code<modelVersion>4.0.0</modelVersion> 5 <parent> 6 <groupId>org.springframework.boot</groupId> 7 <artifactId>spring-boot-starter-parent</artifactId> 8 <version>2.3.1.RELEASE</version> 9 <relativePath/> <!-- lookup parent from repository --> 10</parent> 11 <groupId>com.jzdsh</groupId> 12 <artifactId>demo</artifactId> 13 <version>0.0.1-SNAPSHOT</version> 14 <name>demo</name> 15 <description>Demo project for Spring Boot</description> 16 17 <properties> 18<java.version>1.8</java.version> 19 </properties> 20 21 <dependencies> 22 <!-- postgresql資料庫驅動--> 23 <dependency> 24 <groupId>org.postgresql</groupId> 25 <artifactId>postgresql</artifactId> 26 <version>42.2.5</version> 27 </dependency> 28 <dependency> 29 <groupId>org.springframework.boot</groupId> 30 <artifactId>spring-boot-starter-jdbc</artifactId> 31 </dependency> 32 <dependency> 33 <groupId>org.springframework.boot</groupId> 34 <artifactId>spring-boot-starter-thymeleaf</artifactId> 35 </dependency> 36 <dependency> 37 <groupId>org.projectlombok</groupId> 38 <artifactId>lombok</artifactId> 39 </dependency> 40 <dependency> 41 <groupId>org.springframework.boot</groupId> 42 <artifactId>spring-boot-starter-web</artifactId> 43 </dependency> 44 <dependency> 45 <groupId>org.mybatis.spring.boot</groupId> 46 <artifactId>mybatis-spring-boot-starter</artifactId> 47 <version>2.1.3</version> 48 </dependency> 49 <dependency> 50 <groupId>mysql</groupId> 51 <artifactId>mysql-connector-java</artifactId> 52 <scope>runtime</scope> 53 </dependency> 54 <dependency> 55 <groupId>org.springframework.boot</groupId> 56 <artifactId>spring-boot-starter-test</artifactId> 57 <scope>test</scope> 58 <exclusions> 59 <exclusion> 60 <groupId>org.junit.vintage</groupId> 61 <artifactId>junit-vintage-engine</artifactId> 62 </exclusion> 63 </exclusions> 64 </dependency> 65 </dependencies> 66 67 <build> 68 <plugins> 69 <plugin> 70 <groupId>org.springframework.boot</groupId> 71 <artifactId>spring-boot-maven-plugin</artifactId> 72 </plugin> 73 </plugins> 74 </build> 75 76 </project>
三.配置檔案application.properties 點選檢視更多配置
1 server.port=8080 2 server.servlet.context-path=/wuzhiqiang#專案名 3 4 5 spring.datasource.url=jdbc:postgresql://10.100.55.64:5432/ruleengine#連線路徑 6 spring.datasource.username=#使用者名稱 7 spring.datasource.password=#密碼 8 spring.datasource.driverClassName=org.postgresql.Driver#驅動 9 10 mybatis.mapperLocations=classpath:templates/mapper/**/*.xmlView Code
四.專案結構
五.上程式碼
1.controller StudentController
1 package com.jzdsh.demo.controller; 2 3 import com.jzdsh.demo.model.Student; 4 import com.jzdsh.demo.service.StudentService; 5 import com.jzdsh.demo.util.AjaxMessage; 6 import org.springframework.beans.factory.annotation.Autowired; 7 import org.springframework.web.bind.annotation.RequestMapping; 8 import org.springframework.web.bind.annotation.RestController; 9 10 import java.util.List; 11 12 /** 13 * @author ex_wuzhiqiang. 14 * @date 2020/7/13. 15 * @time 15:36. 16 */ 17 @RestController 18 @RequestMapping("/index") 19 public class StudentController { 20 @Autowired(required = false) 21 private StudentService studentService; 22 23 @RequestMapping("/select") 24 public AjaxMessage selectAll(){ 25 AjaxMessage<Object> objectAjaxMessage = new AjaxMessage<>(); 26 List<Student> list = studentService.selectAll(); 27 if (list != null){ 28 objectAjaxMessage.setData(list); 29 objectAjaxMessage.setIs(true); 30 objectAjaxMessage.setMsg("success"); 31 }else { 32 objectAjaxMessage.setMsg("fail"); 33 objectAjaxMessage.setIs(false); 34 } 35 return objectAjaxMessage; 36 } 37 }View Code
2.service StudentService
1 package com.jzdsh.demo.service; 2 3 import com.jzdsh.demo.model.Student; 4 5 import java.util.List; 6 7 /** 8 * @author ex_wuzhiqiang. 9 * @date 2020/7/13. 10 * @time 15:38. 11 */ 12 public interface StudentService { 13 List<Student> selectAll(); 14 }View Code
3.service impl StudentServiceImpl
1 package com.jzdsh.demo.service.impl; 2 3 import com.jzdsh.demo.dao.StudentDao; 4 import com.jzdsh.demo.model.Student; 5 import com.jzdsh.demo.service.StudentService; 6 import org.springframework.beans.factory.annotation.Autowired; 7 import org.springframework.stereotype.Service; 8 9 import java.util.List; 10 11 /** 12 * @author ex_wuzhiqiang. 13 * @date 2020/7/13. 14 * @time 15:38. 15 */ 16 @Service 17 public class StudentServiceImpl implements StudentService { 18 @Autowired 19 private StudentDao studentDao; 20 @Override 21 public List<Student> selectAll() { 22 try { 23 return studentDao.selectAll(); 24 } catch (Exception e) { 25 e.printStackTrace(); 26 } 27 return null; 28 } 29 }View Code
4.dao StudentDao
1 package com.jzdsh.demo.dao; 2 3 import com.jzdsh.demo.model.Student; 4 import org.apache.ibatis.annotations.Mapper; 5 6 import java.util.List; 7 8 /** 9 * @author ex_wuzhiqiang. 10 * @date 2020/7/13. 11 * @time 16:16. 12 */ 13 @Mapper 14 public interface StudentDao { 15 List<Student> selectAll(); 16 }View Code
5.util AjaxMessage
1 package com.jzdsh.demo.util; 2 3 import lombok.Data; 4 5 /** 6 * @author ex_wuzhiqiang. 7 * @date 2020/7/13. 8 * @time 15:39. 9 */ 10 @Data 11 public class AjaxMessage<T> { 12 private String msg; 13 private T data; 14 private boolean is; 15 public AjaxMessage() { 16 this.msg="成功"; 17 this.is=true; 18 } 19 20 public AjaxMessage(String code, String msg, boolean is) { 21 this.msg = msg; 22 this.is = is; 23 } 24 25 public AjaxMessage(String code, String msg, T data, boolean is) { 26 this.msg = msg; 27 this.data = data; 28 this.is = is; 29 } 30 }View Code
6.templates/mapper/student StudentMapper.xml
1 <?xml version="1.0" encoding="UTF-8" ?> 2 <!DOCTYPE mapper PUBLIC "-//mybatis.org//DTD Mapper 3.0//EN" 3 "http://mybatis.org/dtd/mybatis-3-mapper.dtd" > 4 <mapper namespace="com.jzdsh.demo.dao.StudentDao"> 5 6 <select id="selectAll" resultType="com.jzdsh.demo.model.Student"> 7 select * from t_test_marketcount order by id asc 8 </select> 9 </mapper>View Code
7.頁面resource/index.html
1 <!DOCTYPE html> 2 <html lang="en"> 3 <head> 4 5 <meta charset="UTF-8"> 6 <title>Title</title> 7 </head> 8 <body> 9 <button onclick="selectButton()"> 10 查詢 11 </button> 12 <table> 13 <thead> 14 <tr> 15 <th>id</th> 16 <th>姓名</th> 17 <th>年齡</th> 18 </tr> 19 </thead> 20 <tbody> 21 22 </tbody> 23 </table> 24 <script type="text/javascript" src="./js/jquery-2.1.1.min.js"></script> 25 <script> 26 function selectButton() { 27 28 $.ajax({ 29 type:"post", 30 url:"/wuzhiqiang/index/select", 31 dataType:"json", 32 success:function (data) { 33 console.log(JSON.stringify(data)); 34 35 console.log(data.data.length 36 ) 37 var str = ""; 38 for (var i=0;i<data.data.length;i++){ 39 str +="<tr>" + 40 "<td>" + 41 data.data[i].id+ 42 "</td>" + 43 "<td>" + 44 data.data[i].name+ 45 "</td>" + 46 "<td>" + 47 data.data[i].age+ 48 "</td>" + 49 "</tr>"; 50 } 51 $("table tbody").append(str); 52 53 } 54 }) 55 } 56 </script> 57 </body> 58 </html>View Code
六.資料庫
七.效果展示
--------------------到此查詢簡單的做完了，增刪改就差不多了，在此就不寫了。。。。。。。。。。。---------------------------------------------------
八.問題總結
1.html頁面引入了jquery，但是js報unresolved function or method $()；
解決：
在idea中選擇file-settings開啟設定視窗，找到Libraries,在Language&Frameworks下面的JavaScript中
點選add，彈出視窗
點選“+”選擇要新增的jquery檔案，注意要選擇不帶min的jquery
2.application.properties問題
主要主要application.properties和application.yml的書寫格式
再一個就是對mapper.xml檔案路徑配置時，要注意路徑（直接寫在resources下直接寫檔名；如果寫在templates包下則要加包名。
如本專案路徑為templates/mapper/studetent/StudentMapper.xml：
配置為：mybatis.mapperLocations=classpath:templates/mapper/**/*.xml）
3.idea中的lombok外掛已經下載，並且在另一個專案上可以使用，但在此專案上不能使用解決辦法：
settings -> Build,Execution,Deployment -> Annotation Processors -> 把Enable annotation processing勾選
4.啟動類
報錯：required a bean of type 'XXX.XXX.XXX' that could not be found
把主啟動類上的exclude= {DataSourceAutoConfiguration.class} 去掉，然後就可以了。
原來為什麼加這個引數？因為原來沒有在application.yml或者application.properties中配置spring.datasource.url這個屬性，所以啟動會報錯。
但是後來我配置了資料來源相關的屬性，應該把exclude= {DataSourceAutoConfiguration.class}去掉，而且spring-data-jpa是操作資料庫相關的框架，可能exculde資料來源配置導致spring不會自動掃描repository。