SpringBoot practice | using JdbcTemplates to access Mysql

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For example, today we will introduce that springboot accesses relational mysql through jdbc and spring's JdbcTemplate.

• SpringBoot 2.x
• jdk 1.8
• maven 3.0
• idea
• mysql

To build a spring boot project, friends who won't refer to the old article: How to use IDEA to build Spring Boot project

<dependencies>xml <!-- jdbcTemplate rely on --> <dependency> <groupId>org.springframework.boot</groupId> <artifactId>spring-boot-starter-jdbc</artifactId> </dependency> <!-- open web: --> <dependency> <groupId>org.springframework.boot</groupId> <artifactId>spring-boot-starter-web</artifactId> </dependency> <!-- mysql Connection class --> <dependency> <groupId>mysql</groupId> <artifactId>mysql-connector-java</artifactId> <scope>runtime</scope> </dependency> <!-- https://mvnrepository.com/artifact/com.alibaba/druid --> <!-- druid Connection pool--> <dependency> <groupId>com.alibaba</groupId> <artifactId>druid</artifactId> <version>1.1.13</version> </dependency> <dependency> <groupId>org.springframework.boot</groupId> <artifactId>spring-boot-starter-test</artifactId> <scope>test</scope> </dependency> </dependencies>

spring: datasource: driver-class-name: com.mysql.jdbc.Driver url: jdbc:mysql://127.0.0.1:3306/test?useUnicode=true&characterEncoding=utf8&serverTimezone=UTC&useSSL=true username: Database user name password: Database password

package com.nasus.domain; /** * Project Name:jdbctemplate_demo <br/> * Package Name:com.nasus.domain <br/> * Date:2019/2/3 10:55 <br/> * <b>Description:</b> TODO: Describe the function of this class < br / > * * @author <a href="[email protected]">nasus</a><br/> * Copyright Notice ========================================================= * This file contains proprietary information of Eastcom Technologies Co. Ltd. * Copying or reproduction without prior written approval is prohibited. * Copyright (c) 2019 ======================================================= */ public class Student { private Integer id; private String name; private Integer age; public Integer getId() { return id; } public void setId(Integer id) { this.id = id; } public String getName() { return name; } public void setName(String name) { this.name = name; } public Integer getAge() { return age; } public void setAge(Integer age) { this.age = age; } @Override public String toString() { return "Student{" + "id=" + id + ", name='" + name + '\'' + ", age=" + age + '}'; } }

package com.nasus.dao; import com.nasus.domain.Student; import java.util.List; /** * Project Name:jdbctemplate_demo <br/> * Package Name:com.nasus.dao <br/> * Date:2019/2/3 10:59 <br/> * <b>Description:</b> TODO: Describe the function of this class < br / > * @author <a href="[email protected]">nasus</a><br/> */ public interface IStudentDao { int add(Student student); int update(Student student); int delete(int id); Student findStudentById(int id); List<Student> findStudentList(); }

Specific implementation class:

package com.nasus.dao.impl; import com.nasus.dao.IStudentDao; import com.nasus.domain.Student; import java.util.List; import org.springframework.beans.factory.annotation.Autowired; import org.springframework.jdbc.core.BeanPropertyRowMapper; import org.springframework.jdbc.core.JdbcTemplate; import org.springframework.stereotype.Repository; /** * Project Name:jdbctemplate_demo <br/> * Package Name:com.nasus.dao.impl <br/> * Date:2019/2/3 11:00 <br/> * <b>Description:</b> TODO: Describe the function of this class < br / > * * @author <a href="[email protected]">nasus</a><br/> */ @Repository public class IStudentDaoImpl implements IStudentDao{ @Autowired private JdbcTemplate jdbcTemplate; @Override public int add(Student student) { return jdbcTemplate.update("insert into student(name, age) values(?, ?)", student.getName(),student.getAge()); } @Override public int update(Student student) { return jdbcTemplate.update("UPDATE student SET NAME=? ,age=? WHERE id=?", student.getName(),student.getAge(),student.getId()); } @Override public int delete(int id) { return jdbcTemplate.update("DELETE from TABLE student where id=?",id); } @Override public Student findStudentById(int id) { // BeanPropertyRowMapper automatically maps the database fields and entity classes of the List result List obtained List<Student> list = jdbcTemplate.query("select * from student where id = ?", new Object[], new BeanPropertyRowMapper(Student.class)); if(list!=null && list.size()>0){ Student student = list.get(0); return student; }else{ return null; } } @Override public List<Student> findStudentList() { // Use Spring's JdbcTemplate to query the database, get the List of List results, and automatically correspond the database table fields and entity classes. You can use BeanPropertyRowMapper List<Student> list = jdbcTemplate.query("select * from student", new Object[]{}, new BeanPropertyRowMapper(Student.class)); if(list!=null && list.size()>0){ return list; }else{ return null; } } }

package com.nasus.service; import com.nasus.domain.Student; import java.util.List; /** * Project Name:jdbctemplate_demo <br/> * Package Name:com.nasus.service <br/> * Date:2019/2/3 11:17 <br/> * <b>Description:</b> TODO: Describe the function of this class < br / > * * @author <a href="[email protected]">nasus</a><br/> */ public interface IStudentService { int add(Student student); int update(Student student); int delete(int id); Student findStudentById(int id); List<Student> findStudentList(); }

Implementation class:

package com.nasus.service.impl; import com.nasus.dao.IStudentDao; import com.nasus.domain.Student; import com.nasus.service.IStudentService; import java.util.List; import org.springframework.beans.factory.annotation.Autowired; import org.springframework.stereotype.Repository; /** * Project Name:jdbctemplate_demo <br/> * Package Name:com.nasus.service.impl <br/> * Date:2019/2/3 11:18 <br/> * <b>Description:</b> TODO: Describe the function of this class < br / > * * @author <a href="[email protected]">nasus</a><br/> * Copyright Notice ========================================================= * This file contains proprietary information of Eastcom Technologies Co. Ltd. * Copying or reproduction without prior written approval is prohibited. * Copyright (c) 2019 ======================================================= */ @Repository public class IStudentServiceImpl implements IStudentService { @Autowired private IStudentDao iStudentDao; @Override public int add(Student student) { return iStudentDao.add(student); } @Override public int update(Student student) { return iStudentDao.update(student); } @Override public int delete(int id) { return iStudentDao.delete(id); } @Override public Student findStudentById(int id) { return iStudentDao.findStudentById(id); } @Override public List<Student> findStudentList() { return iStudentDao.findStudentList(); } }

package com.nasus.controller; import com.nasus.domain.Student; import com.nasus.service.IStudentService; import java.util.List; import org.springframework.beans.factory.annotation.Autowired; import org.springframework.web.bind.annotation.DeleteMapping; import org.springframework.web.bind.annotation.GetMapping; import org.springframework.web.bind.annotation.PathVariable; import org.springframework.web.bind.annotation.PostMapping; import org.springframework.web.bind.annotation.PutMapping; import org.springframework.web.bind.annotation.RequestBody; import org.springframework.web.bind.annotation.RequestMapping; import org.springframework.web.bind.annotation.RestController; /** * Project Name:jdbctemplate_demo <br/> * Package Name:com.nasus.controller <br/> * Date:2019/2/3 11:21 <br/> * <b>Description:</b> TODO: Describe the function of this class < br / > * * @author <a href="[email protected]">nasus</a><br/> */ @RestController @RequestMapping("/student") public class StudentController { @Autowired private IStudentService iStudentService; @PostMapping("") public int addStudent(@RequestBody Student student){ return iStudentService.add(student); } @PutMapping("/") public String updateStudent(@PathVariable Integer id, @RequestBody Student student){ Student oldStudent = new Student(); oldStudent.setId(id); oldStudent.setName(student.getName()); oldStudent.setAge(student.getAge()); int t = iStudentService.update(oldStudent); if (t == 1){ return student.toString(); }else { return "Error in updating student information"; } } @GetMapping("/") public Student findStudentById(@PathVariable Integer id){ return iStudentService.findStudentById(id); } @GetMapping("/list") public List<Student> findStudentList(){ return iStudentService.findStudentList(); } @DeleteMapping("/") public int deleteStudentById(@PathVariable Integer id){ return iStudentService.delete(id); } }

Other api tests can pass the postman test. I have passed all the tests here. Please feel free to use it.

Source code download: https://github.com/turoDog/De...

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3 December 2019, 13:27 | Views: 9876