一、整合Mybatis
1、新建一个springboot项目
2、修改pom依赖
<dependency>
<groupId>mysql</groupId>
<artifactId>mysql-connector-java</artifactId>
<version>5.1.44</version>
</dependency>
<plugin>
<groupId>org.mybatis.generator</groupId>
<artifactId>mybatis-generator-maven-plugin</artifactId>
<version>1.3.2</version>
<dependencies>
<!--使用Mybatis-generator插件不能使用太高版本的mysql驱动 -->
<dependency>
<groupId>mysql</groupId>
<artifactId>mysql-connector-java</artifactId>
<version>5.1.44</version>
</dependency>
</dependencies>
<configuration>
<overwrite>true</overwrite>
</configuration>
</plugin>
3、修改generatorConfig.xml
<!-- 02 指定sql映射文件生成的位置 -->
<sqlMapGenerator targetPackage="com.xnx.springbootmybatis.mapper"
targetProject="src/main/resources/mappers">
<!-- 是否允许子包，即targetPackage.schemaName.tableName -->
<property name="enableSubPackages" value="false"/>
</sqlMapGenerator>
4、修改application.yml
mybatis:
mapper-locations: classpath:mappers/**/*.xml
type-aliases-package: com.xnx.springbootmybatis.model
server:
port: 8080
spring:
application:
name: springbootmybatis
datasource:
driver-class-name: com.mysql.jdbc.Driver
name: defaultDataSource
password: 123456
url: jdbc:mysql://localhost:3306/t280?useUnicode=true&characterEncoding=UTF-8
username: root
5、配置逆向生成
6、边写controller层
BookController：
package com.xnx.springbootmybatis;
import com.xnx.springbootmybatis.mapper.BookMapper;
import com.xnx.springbootmybatis.model.Book;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.web.bind.annotation.*;
import java.util.List;
/**
* @author xnx
* @create 2022-11-01 15:07
*/
@RestController
@RequestMapping("/mybatis")
public class BookController {
@Autowired
private BookMapper bookMapper;
// 查询
@GetMapping("/get")
public Book get(Integer bid){
return bookMapper.selectByPrimaryKey(bid);
}
// 删除
@DeleteMapping("/delete")
public int delete(Integer bid){
return bookMapper.deleteByPrimaryKey(bid);
}
// 新增
@PutMapping("/add")
public int add(Book book){
return bookMapper.insert(book);
}
}
7、测试
新增：
查询单个：
删除：
二、整合Mybatisplus
1、新建一个springboot项目
2、application.yml
server:
port: 8080
spring:
application:
name: springbootmp
datasource:
driver-class-name: com.mysql.jdbc.Driver
name: defaultDataSource
password: 123456
url: jdbc:mysql://localhost:3306/t280?useUnicode=true&characterEncoding=UTF-8
username: root
logging:
level:
com.zking.demo: debug
mybatis-plus:
mapper-locations: classpath:mappers/**/*.xml
type-aliases-package: com.xnx.springbootmp.book.model
3、MPGenerator
package com.xnx.springbootmp.mp;
import com.baomidou.mybatisplus.annotation.DbType;
import com.baomidou.mybatisplus.annotation.IdType;
import com.baomidou.mybatisplus.core.exceptions.MybatisPlusException;
import com.baomidou.mybatisplus.core.toolkit.StringPool;
import com.baomidou.mybatisplus.core.toolkit.StringUtils;
import com.baomidou.mybatisplus.generator.AutoGenerator;
import com.baomidou.mybatisplus.generator.InjectionConfig;
import com.baomidou.mybatisplus.generator.config.*;
import com.baomidou.mybatisplus.generator.config.po.TableInfo;
import com.baomidou.mybatisplus.generator.config.rules.NamingStrategy;
import com.baomidou.mybatisplus.generator.engine.FreemarkerTemplateEngine;
import java.util.ArrayList;
import java.util.List;
import java.util.Scanner;
/**
* @author xnx
* @create 2022-11-01 15:44
*/
public class MPGenerator {
/**
* <p>
* 读取控制台内容
* </p>
*/
public static String scanner(String tip) {
Scanner scanner = new Scanner(System.in);
StringBuilder help = new StringBuilder();
help.append("请输入" + tip);
System.out.println(help.toString());
if (scanner.hasNext()) {
String ipt = scanner.next();
if (StringUtils.isNotBlank(ipt)) {
if ("quit".equals(ipt)) return "";
return ipt;
}
}
throw new MybatisPlusException("请输入正确的" + tip + "！");
}
public static void main(String[] args) {
// 代码生成器
AutoGenerator mpg = new AutoGenerator();
// 1.全局配置
GlobalConfig gc = new GlobalConfig();
String projectPath = System.getProperty("user.dir") + "/springbootmp";
System.out.println(projectPath);
gc.setOutputDir(projectPath + "/src/main/java");
gc.setOpen(false);
gc.setBaseResultMap(true);//生成BaseResultMap
gc.setActiveRecord(false);// 不需要ActiveRecord特性的请改为false
gc.setEnableCache(false);// XML 二级缓存
gc.setBaseResultMap(true);// XML ResultMap
gc.setBaseColumnList(true);// XML columList
//gc.setSwagger2(true); //实体属性 Swagger2 注解
gc.setAuthor("xnx");
// 自定义文件命名，注意 %s 会自动填充表实体属性！
gc.setMapperName("%sMapper");
gc.setXmlName("%sMapper");
gc.setServiceName("%sService");
gc.setServiceImplName("%sServiceImpl");
gc.setControllerName("%sController");
gc.setIdType(IdType.AUTO);
mpg.setGlobalConfig(gc);
// 2.数据源配置
DataSourceConfig dsc = new DataSourceConfig();
dsc.setDbType(DbType.MYSQL);
dsc.setUrl("jdbc:mysql://localhost:3306/t280?useUnicode=true&characterEncoding=UTF-8");
dsc.setDriverName("com.mysql.jdbc.Driver");
dsc.setUsername("root");
dsc.setPassword("123456");
mpg.setDataSource(dsc);
// 3.包配置
PackageConfig pc = new PackageConfig();
String moduleName = scanner("模块名(quit退出，表示没有模块名)");
if (StringUtils.isNotBlank(moduleName)) {
pc.setModuleName(moduleName);
}
// 设置基包(父包)
pc.setParent("com.xnx.springbootmp")
.setMapper("mapper")
.setService("service")
.setController("controller")
.setEntity("model");
mpg.setPackageInfo(pc);
// 4.自定义配置
InjectionConfig cfg = new InjectionConfig() {
@Override
public void initMap() {
// to do nothing
}
};
// 如果模板引擎是 freemarker
String templatePath = "/templates/mapper.xml.ftl";
// 自定义输出配置
List<FileOutConfig> focList = new ArrayList<>();
// 自定义配置会被优先输出
focList.add(new FileOutConfig(templatePath) {
@Override
public String outputFile(TableInfo tableInfo) {
// 自定义输出文件名 ， 如果你 Entity 设置了前后缀、此处注意 xml 的名称会跟着发生变化！！
if (StringUtils.isNotBlank(pc.getModuleName())) {
return projectPath + "/src/main/resources/mappers/" + pc.getModuleName() + "/" + tableInfo.getEntityName() + "Mapper" + StringPool.DOT_XML;
} else {
return projectPath + "/src/main/resources/mappers/" + tableInfo.getEntityName() + "Mapper" + StringPool.DOT_XML;
}
}
});
cfg.setFileOutConfigList(focList);
mpg.setCfg(cfg);
// 配置模板
TemplateConfig templateConfig = new TemplateConfig();
templateConfig.setXml(null);
mpg.setTemplate(templateConfig);
// 5.策略配置
StrategyConfig strategy = new StrategyConfig();
// 表名生成策略(下划线转驼峰命名)
strategy.setNaming(NamingStrategy.underline_to_camel);
// 列名生成策略(下划线转驼峰命名)
strategy.setColumnNaming(NamingStrategy.underline_to_camel);
// 是否启动Lombok配置
strategy.setEntityLombokModel(true);
// 是否启动REST风格配置
strategy.setRestControllerStyle(true);
// 自定义实体父类strategy.setSuperEntityClass("com.baomidou.mybatisplus.extension.activerecord.Model");
// 自定义service父接口strategy.setSuperServiceClass("com.baomidou.mybatisplus.extension.service.IService");
// 自定义service实现类strategy.setSuperServiceImplClass("com.baomidou.mybatisplus.extension.service.impl.ServiceImpl");
// 自定义mapper接口strategy.setSuperMapperClass("com.baomidou.mybatisplus.core.mapper.BaseMapper");
strategy.setSuperEntityColumns("id");
// 写于父类中的公共字段plus
strategy.setSuperEntityColumns("id");
strategy.setInclude(scanner("表名，多个英文逗号分割").split(","));
strategy.setControllerMappingHyphenStyle(true);
//表名前缀(可变参数)：“t_”或”“t_模块名”，例如：t_user或t_sys_user
strategy.setTablePrefix("t_", "t_sys_");
//strategy.setTablePrefix(scanner("请输入表前缀"));
mpg.setStrategy(strategy);
mpg.setTemplateEngine(new FreemarkerTemplateEngine());
// 执行
mpg.execute();
}
}
4、生成代码
①MvcBookMapper
package com.xnx.springbootmp.book.mapper;
import com.xnx.springbootmp.book.model.MvcBook;
import com.baomidou.mybatisplus.core.mapper.BaseMapper;
import org.springframework.stereotype.Repository;
/**
* <p>
* Mapper 接口
* </p>
*
* @author xnx
* @since 2022-11-01
*/
@Repository
public interface MvcBookMapper extends BaseMapper<MvcBook> {
}
②MvcBook
package com.xnx.springbootmp.book.model;
import com.baomidou.mybatisplus.annotation.TableName;
import com.baomidou.mybatisplus.annotation.IdType;
import com.baomidou.mybatisplus.annotation.TableId;
import java.io.Serializable;
import lombok.Data;
import lombok.EqualsAndHashCode;
/**
* <p>
*
* </p>
*
* @author xnx
* @since 2022-11-01
*/
@Data
@EqualsAndHashCode(callSuper = false)
@TableName("t_mvc_book")
public class MvcBook implements Serializable {
private static final long serialVersionUID = 1L;
@TableId(value = "bid", type = IdType.AUTO)
private Integer bid;
private String bname;
private Float price;
}
③MvcBookServiceImpl
package com.xnx.springbootmp.book.service.impl;
import com.xnx.springbootmp.book.model.MvcBook;
import com.xnx.springbootmp.book.mapper.MvcBookMapper;
import com.xnx.springbootmp.book.service.MvcBookService;
import com.baomidou.mybatisplus.extension.service.impl.ServiceImpl;
import org.springframework.stereotype.Service;
/**
* <p>
* 服务实现类
* </p>
*
* @author xnx
* @since 2022-11-01
*/
@Service
public class MvcBookServiceImpl extends ServiceImpl<MvcBookMapper, MvcBook> implements MvcBookService {
}
④MvcBookService
package com.xnx.springbootmp.book.service;
import com.xnx.springbootmp.book.model.MvcBook;
import com.baomidou.mybatisplus.extension.service.IService;
/**
* <p>
* 服务类
* </p>
*
* @author xnx
* @since 2022-11-01
*/
public interface MvcBookService extends IService<MvcBook> {
}
⑤MvcBookMapper.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.xnx.springbootmp.book.mapper.MvcBookMapper">
<!-- 通用查询映射结果 -->
<resultMap id="BaseResultMap" type="com.xnx.springbootmp.book.model.MvcBook">
<id column="bid" property="bid" />
<result column="bname" property="bname" />
<result column="price" property="price" />
</resultMap>
<!-- 通用查询结果列 -->
<sql id="Base_Column_List">
bid, bname, price
</sql>
</mapper>
5、MvcBookController
package com.xnx.springbootmp.book.controller;
import com.baomidou.mybatisplus.core.conditions.query.QueryWrapper;
import com.xnx.springbootmp.book.model.MvcBook;
import com.xnx.springbootmp.book.service.MvcBookService;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.web.bind.annotation.*;
import java.util.List;
/**
* <p>
* 前端控制器
* </p>
*
* @author xnx
* @since 2022-11-01
*/
@RestController
@RequestMapping("/book/mvc-book")
public class MvcBookController {
@Autowired
private MvcBookService bookService;
// 查询所有
@GetMapping("/list")
public List<MvcBook> list(){
return bookService.list();
}
// 按条件查询
@GetMapping("/listByCondition")
public List<MvcBook> listByCondition(MvcBook book){
// 如果使用的是Mybatis.那么我们需要写sql语句，而mp不需要
QueryWrapper qw = new QueryWrapper();
qw.like("bname",book.getBname());
return bookService.list(qw);
}
// 查询单个
@GetMapping("/get")
public MvcBook get(MvcBook book){
return bookService.getById(book.getBid());
}
// 增加
@PutMapping("/add")
public boolean add(MvcBook book){
return bookService.save(book);
}
// 删除
@DeleteMapping("/delete")
public boolean delete(MvcBook book){
return bookService.removeById(book.getBid());
}
// 修改
@PostMapping("/update")
public boolean update(MvcBook book){
return bookService.saveOrUpdate(book);
}
}
6、测试
三、Mybatisplus中使用Mybatis实现多表连查的功能
1、MvcBookMapper.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.xnx.springbootmp.book.mapper.MvcBookMapper">
<!-- 通用查询映射结果 -->
<resultMap id="BaseResultMap" type="com.xnx.springbootmp.book.model.MvcBook">
<id column="bid" property="bid" />
<result column="bname" property="bname" />
<result column="price" property="price" />
</resultMap>
<!-- 通用查询结果列 -->
<sql id="Base_Column_List">
bid, bname, price
</sql>
<!--注意mybatisplus中的配置文件默认是没有生成对应增删改查的sql语句的，因为mp的底层接口都封装好了，调用即可-->
<select id="queryUserRole" parameterType="java.util.Map" resultType="java.util.Map">
select u.username,r.rolename from
t_shiro_user u,t_shiro_user_role ur,t_shiro_role r
where u.userid = ur.userid
and ur.roleid = r.roleid
<if test="username !=null and username != ''">
and u.username = #{username}
</if>
</select>
</mapper>
2、MvcBookMapper
package com.xnx.springbootmp.book.mapper;
import com.xnx.springbootmp.book.model.MvcBook;
import com.baomidou.mybatisplus.core.mapper.BaseMapper;
import org.springframework.stereotype.Repository;
import java.util.List;
import java.util.Map;
/**
* <p>
* Mapper 接口
* </p>
*
* @author xnx
* @since 2022-11-01
*/
@Repository
public interface MvcBookMapper extends BaseMapper<MvcBook> {
List<Map> queryUserRole(Map map);
}
3、MvcBookService
package com.xnx.springbootmp.book.service;
import com.xnx.springbootmp.book.model.MvcBook;
import com.baomidou.mybatisplus.extension.service.IService;
import java.util.List;
import java.util.Map;
/**
* <p>
* 服务类
* </p>
*
* @author xnx
* @since 2022-11-01
*/
public interface MvcBookService extends IService<MvcBook> {
List<Map> queryUserRole(Map map);
}
4、MvcBookServiceImpl
package com.xnx.springbootmp.book.service.impl;
import com.xnx.springbootmp.book.model.MvcBook;
import com.xnx.springbootmp.book.mapper.MvcBookMapper;
import com.xnx.springbootmp.book.service.MvcBookService;
import com.baomidou.mybatisplus.extension.service.impl.ServiceImpl;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Service;
import java.util.List;
import java.util.Map;
/**
* <p>
* 服务实现类
* </p>
*
* @author xnx
* @since 2022-11-01
*/
@Service
public class MvcBookServiceImpl extends ServiceImpl<MvcBookMapper, MvcBook> implements MvcBookService {
@Autowired
private MvcBookMapper mvcBookMapper;
@Override
public List<Map> queryUserRole(Map map) {
return mvcBookMapper.queryUserRole(map);
}
}
5、MvcBookController
package com.xnx.springbootmp.book.controller;
import com.baomidou.mybatisplus.core.conditions.query.QueryWrapper;
import com.xnx.springbootmp.book.model.MvcBook;
import com.xnx.springbootmp.book.service.MvcBookService;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.web.bind.annotation.*;
import java.util.HashMap;
import java.util.List;
import java.util.Map;
/**
* <p>
* 前端控制器
* </p>
*
* @author xnx
* @since 2022-11-01
*/
@RestController
@RequestMapping("/book/mvc-book")
public class MvcBookController {
@Autowired
private MvcBookService bookService;
// 查询所有
@GetMapping("/list")
public List<MvcBook> list(){
return bookService.list();
}
// 按条件查询
@GetMapping("/listByCondition")
public List<MvcBook> listByCondition(MvcBook book){
// 如果使用的是Mybatis.那么我们需要写sql语句，而mp不需要
QueryWrapper qw = new QueryWrapper();
qw.like("bname",book.getBname());
return bookService.list(qw);
}
// 查询单个
@GetMapping("/get")
public MvcBook get(MvcBook book){
return bookService.getById(book.getBid());
}
// 增加
@PutMapping("/add")
public boolean add(MvcBook book){
return bookService.save(book);
}
// 删除
@DeleteMapping("/delete")
public boolean delete(MvcBook book){
return bookService.removeById(book.getBid());
}
// 修改
@PostMapping("/update")
public boolean update(MvcBook book){
return bookService.saveOrUpdate(book);
}
// 多表联查，用户账户对应角色的功能，轮着mybatisplus是一样可以使用mybatis功能
@GetMapping("/dbcx")
public List<Map> get(String uname){
// 前端传了一个张三
Map map = new HashMap();
map.put("username",uname);
return bookService.queryUserRole(map);
}
}
转载：https://blog.csdn.net/weixin_67677668/article/details/127634328
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