SSMP整合演示

已于 2023-05-26 20:11:11 修改
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分类专栏： SpringBoot 文章标签： mybatis java spring boot
于 2023-05-26 18:08:14 首次发布
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本文链接：https://blog.youkuaiyun.com/weixin_51330376/article/details/130891394
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文章详细描述了如何创建一个名为`user`的数据库表，包括表结构和初始数据插入。接着，引入了mybatis-plus的依赖，用于简化SpringBoot项目的数据库操作，并展示了如何配置数据库连接信息。之后，创建了User实体类和UserDao接口，实现了基本的增删改查功能。此外，还提到了分页功能的配置和测试，以及日志的开启设置。

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创建数据库

-- ----------------------------
-- Table structure for user
-- ----------------------------
DROP TABLE IF EXISTS `user`;
CREATE TABLE `user`  (
  `id` int(0) UNSIGNED NOT NULL AUTO_INCREMENT,
  `name` varchar(10) CHARACTER SET utf8 COLLATE utf8_bin NULL DEFAULT NULL,
  `sex` char(6) CHARACTER SET utf8 COLLATE utf8_bin NULL DEFAULT NULL,
  `pwd` varchar(20) CHARACTER SET utf8 COLLATE utf8_bin NULL DEFAULT NULL,
  `email` varchar(20) CHARACTER SET utf8 COLLATE utf8_bin NULL DEFAULT NULL,
  PRIMARY KEY (`id`) USING BTREE
) ENGINE = InnoDB AUTO_INCREMENT = 28 CHARACTER SET = utf8 COLLATE = utf8_bin ROW_FORMAT = Dynamic;

-- ----------------------------
-- Records of user
-- ----------------------------
INSERT INTO `user` VALUES (1, 'test0', '男', 'aaaa', '1230@qq.com');
INSERT INTO `user` VALUES (2, 'test1', '女', 'aaaa', '1231@qq.com');
INSERT INTO `user` VALUES (3, 'test2', '男', 'aaaa', '1232@qq.com');
INSERT INTO `user` VALUES (4, 'test3', '女', 'aaaa', '1233@qq.com');
INSERT INTO `user` VALUES (5, 'test4', '男', 'aaaa', '1234@qq.com');
INSERT INTO `user` VALUES (6, 'test5', '女', 'aaaa', '1235@qq.com');
INSERT INTO `user` VALUES (7, 'test6', '男', 'aaaa', '1236@qq.com');
INSERT INTO `user` VALUES (8, 'test7', '女', 'aaaa', '1237@qq.com');
INSERT INTO `user` VALUES (9, 'test8', '男', 'aaaa', '1238@qq.com');
INSERT INTO `user` VALUES (10, 'test9', '女', 'aaaa', '1239@qq.com');
INSERT INTO `user` VALUES (11, 'test10', '男', 'aaaa', '12310@qq.com');
INSERT INTO `user` VALUES (12, 'test11', '女', 'aaaa', '12311@qq.com');
INSERT INTO `user` VALUES (13, 'test12', '男', 'aaaa', '12312@qq.com');
INSERT INTO `user` VALUES (14, 'test13', '女', 'aaaa', '12313@qq.com');
INSERT INTO `user` VALUES (15, 'test14', '男', 'aaaa', '12314@qq.com');

创建项目

导入坐标




        <!--mybatis-plus的springboot支持-->
        <dependency>
            <groupId>com.baomidou</groupId>
            <artifactId>mybatis-plus-boot-starter</artifactId>
            <version>3.4.3.1</version>
        </dependency>
        <!--mysql驱动-->
        <dependency>
            <groupId>mysql</groupId>
            <artifactId>mysql-connector-java</artifactId>
            <scope>runtime</scope>
        </dependency>
        <!--简化代码的工具包-->
        <dependency>
            <groupId>org.projectlombok</groupId>
            <artifactId>lombok</artifactId>
            <optional>true</optional>
        </dependency>
        <!--测试-->
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-test</artifactId>
            <scope>test</scope>
        </dependency>
        <dependency>
            <groupId>junit</groupId>
            <artifactId>junit</artifactId>
            <version>4.13.1</version>
            <scope>test</scope>
        </dependency>

修改配置文件

mybatis-plus:
  configuration:
    log-impl: org.apache.ibatis.logging.stdout.StdOutImpl #开启sql日志
    map-underscore-to-camel-case: true
    # 该配置就是将带有下划线的表字段映射为驼峰格式的实体类属性
spring:
  datasource:
    driver-class-name: com.mysql.cj.jdbc.Driver
    url: jdbc:mysql://localhost:3306/test?serverTimezone=GMT%2B8&useUnicode=true&characterEncoding=UTF-8
    username: root
    password: root


mybatis-plus:
configuration:
    log-impl: org.apache.ibatis.logging.stdout.StdOutImpl #开启sql日志
    map-underscore-to-camel-case: true
global-config:
    db-config:
      table-prefix: tbl_		#设置表名通用前缀
      id-type: auto				#设置主键id字段的生成策略为参照数据库设定的策略，当前数据库设置id生成策略为自增

编写数据层

创建实体类domian

import com.baomidou.mybatisplus.annotation.IdType;
import com.baomidou.mybatisplus.annotation.TableId;
import com.baomidou.mybatisplus.annotation.TableName;
import lombok.Builder;
import lombok.Data;

@Data
@Builder
@TableName(value = "User")//指定表名
public class User implements Serializable {
    private static final long serialVersionUID = -5644799954031156649L;
    //value与数据库主键列名一致，若实体类属性名与表主键列名一致可省略value
    @TableId(value = "id", type = IdType.AUTO)//指定自增策略
    private Integer id;
    private String name;
    private String sex;
    private String pwd;
    private String email;
}

编写dao层

@Mapper
public interface UserDao extends BaseMapper<User> {
}

 测试类（增删改查）

package com.itheima.dao;

import com.baomidou.mybatisplus.core.conditions.query.LambdaQueryWrapper;
import com.baomidou.mybatisplus.core.conditions.query.QueryWrapper;
import com.baomidou.mybatisplus.core.metadata.IPage;
import com.baomidou.mybatisplus.extension.plugins.pagination.Page;
import com.itheima.domain.Book;
import org.junit.jupiter.api.Test;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.boot.test.context.SpringBootTest;

@SpringBootTest
public class BookDaoTestCase {

    @Autowired
    private BookDao bookDao;

    @Test
    void testGetById(){
        System.out.println(bookDao.selectById(1));
    }

    @Test
    void testSave(){
        Book book = new Book();
        book.setType("测试数据123");
        book.setName("测试数据123");
        book.setDescription("测试数据123");
        bookDao.insert(book);
    }

    @Test
    void testUpdate(){
        Book book = new Book();
        book.setId(17);
        book.setType("测试数据abcdefg");
        book.setName("测试数据123");
        book.setDescription("测试数据123");
        bookDao.updateById(book);
    }

    @Test
    void testDelete(){
        bookDao.deleteById(16);
    }

    @Test
    void testGetAll(){
        bookDao.selectList(null);
    }

//分页功能
@Test
void testGetPage(){
    IPage page = new Page(2,5);
    bookDao.selectPage(page, null);
    System.out.println(page.getCurrent());
    System.out.println(page.getSize());
    System.out.println(page.getTotal());
    System.out.println(page.getPages());
    System.out.println(page.getRecords());
}
}

业务层开发

public interface UserService extends IService<User> {
}

@Service
public class UserServiceImpl extends ServiceImpl<UserDao, User> implements UserService {

}

测试

@RestController
@RequestMapping("/books")
public class BookController2 {

    @Autowired
    private IBookService bookService;

    @GetMapping
    public List<Book> getAll(){
        return bookService.list();
    }

    @PostMapping
    public Boolean save(@RequestBody Book book){
        return bookService.save(book);
    }

    @PutMapping
    public Boolean update(@RequestBody Book book){
        return bookService.modify(book);
    }

    @DeleteMapping("{id}")
    public Boolean delete(@PathVariable Integer id){
        return bookService.delete(id);
    }

    @GetMapping("{id}")
    public Book getById(@PathVariable Integer id){
        return bookService.getById(id);
    }

    @GetMapping("{currentPage}/{pageSize}")
    public IPage<Book> getPage(@PathVariable int currentPage,@PathVariable int pageSize){
        return bookService.getPage(currentPage,pageSize, null);
    }
}

控制层开发

@RestController
@RequestMapping("/books")
public class BookController2 {

    @Autowired
    private IBookService bookService;

    @GetMapping
    public List<Book> getAll(){
        return bookService.list();
    }

    @PostMapping
    public Boolean save(@RequestBody Book book){
        return bookService.save(book);
    }

    @PutMapping
    public Boolean update(@RequestBody Book book){
        return bookService.modify(book);
    }

    @DeleteMapping("{id}")
    public Boolean delete(@PathVariable Integer id){
        return bookService.delete(id);
    }

    @GetMapping("{id}")
    public Book getById(@PathVariable Integer id){
        return bookService.getById(id);
    }

    @GetMapping("{currentPage}/{pageSize}")
    public IPage<Book> getPage(@PathVariable int currentPage,@PathVariable int pageSize){
        return bookService.getPage(currentPage,pageSize, null);
    }
}

分页功能

分页拦截器

@Configuration
public class MPConfig {
    @Bean
    public MybatisPlusInterceptor mybatisPlusInterceptor(){
        MybatisPlusInterceptor interceptor = new MybatisPlusInterceptor();
        interceptor.addInnerInterceptor(new PaginationInnerInterceptor());
        return interceptor;
    }
}

分页测试

@Configuration
public class MPConfig {
    @Bean
    public MybatisPlusInterceptor mybatisPlusInterceptor(){
        MybatisPlusInterceptor interceptor = new MybatisPlusInterceptor();
        interceptor.addInnerInterceptor(new PaginationInnerInterceptor());
        return interceptor;
    }
}

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