SSM如何

目录

1、整合Mybatis

        1.1.新建项目

        1.2.添加pom依赖

        1.3.application.yml

        1.4.generatorConfig.xml

        1.5.设置逆向生成 

        1.6.编写controller层

       1.7.测试

2、整合 Mybatis-plus

        2.1Mybatis-plus简介

        2.2.创建项目

         2.3.添加pom依赖

        2.4.application.yml

        2.5.MPGenerator

        2.6.生成代码

                2.6.1.BookMapper

                2.6.2.Book

                2.6.3.BookServiceImpl

                2.6.4.BookService

                2.6.5.BookMapper.xml

                2.6.6.BookController

                2.6.7.测试

 3、Mybatisplus中使用Mybatis实现多表连查的功能

        3.1.BookMapper.xml

        3.2.BookMapper

        3.3.BookService

        3.4.BookServiceImpl

        3.5.BookController


1、整合Mybatis

        1.1.新建项目

        SSM如何_第1张图片

 

        1.2.添加pom依赖

        
                org.mybatis.generator
                mybatis-generator-maven-plugin
                1.3.2
                
                    
                    
                        mysql
                        mysql-connector-java
                        5.1.44
                    
                
                
                    true
                
         

        1.3.application.yml

mybatis:
    mapper-locations: classpath:mappers/**/*.xml
    type-aliases-package: com.ycx.springbootmybatis.mybatis.model
server:
    port: 8080
spring:
    application:
        name: springbootmybatis
    datasource:
        driver-class-name: com.mysql.jdbc.Driver
        name: defaultDataSource
        password: 1234
        url: jdbc:mysql://localhost:3306/yjy?useUnicode=true&characterEncoding=UTF-8
        username: root

        1.4.generatorConfig.xml


        
            
            
        

        完整 generatorConfig.xml




    
    
 
    
    
 
    
    
        
        
            
             
        
 
        
        
 
        
        
            
            
        
 
        
        
        
        
            
            
            
            
            
            
            
            
        
 
        
        
            
            
        
 
        
        
        
        
        
            
            
        
 
 
 
        

        1.5.设置逆向生成 

SSM如何_第2张图片

        1.6.编写controller层

package com.zwc.springbootmybatis;

import com.zwc.springbootmybatis.mapper.BookMapper;
import com.zwc.springbootmybatis.model.Book;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.web.bind.annotation.*;

import java.util.List;

/**
 * @author zwc
 * @create 2022-11-19 16:23
 */
@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);
    }
}

       1.7.测试

 新增:SSM如何_第3张图片

 查询单个:

SSM如何_第4张图片

 删除:

SSM如何_第5张图片

2、整合 Mybatis-plus

        2.1Mybatis-plus简介

                官网:MyBatis-PlusMyBatis-Plus 官方文档https://baomidou.com/

        2.2.创建项目

        勾选五个组件:lombok、web、jdbc、mybatis-plus、MySQL driverSSM如何_第6张图片

         2.3.添加pom依赖


            com.baomidou
            mybatis-plus-boot-starter
            3.4.2
        
        
            com.baomidou
            mybatis-plus-generator
            3.4.1
        
        
            org.freemarker
            freemarker
            2.3.31
 

        2.4.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/aaa?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

        2.5.MPGenerator

package com.zwc.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 zwc
 * @create 2022-11-21 15:44
 */
public class MPGenerator {
    /**
     * 

* 读取控制台内容 *

*/ 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.zwc.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 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(); } }

        2.6.生成代码

                2.6.1.BookMapper

package com.zwc.springbootmp.book.mapper;

import com.zwc.springbootmp.book.model.MvcBook;
import com.baomidou.mybatisplus.core.mapper.BaseMapper;
import org.springframework.stereotype.Repository;

/**
 * 

* Mapper 接口 *

* */ @Repository public interface MvcBookMapper extends BaseMapper { }

                2.6.2.Book

package com.zwc.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;

/**
 * 

* *

* */ @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; }

                2.6.3.BookServiceImpl

package com.zwc.springbootmp.book.service.impl;

import com.zwc.springbootmp.book.model.MvcBook;
import com.zwc.springbootmp.book.mapper.MvcBookMapper;
import com.zwc.springbootmp.book.service.MvcBookService;
import com.baomidou.mybatisplus.extension.service.impl.ServiceImpl;
import org.springframework.stereotype.Service;

/**
 * 

* 服务实现类 *

* */ @Service public class MvcBookServiceImpl extends ServiceImpl implements MvcBookService { }

                2.6.4.BookService

package com.zwc.springbootmp.book.service;

import com.zwc.springbootmp.book.model.MvcBook;
import com.baomidou.mybatisplus.extension.service.IService;

/**
 * 

* 服务类 *

* */ public interface MvcBookService extends IService { }

                2.6.5.BookMapper.xml





    
    
        
        
        
    

    
    
        bid, bname, price
    



                2.6.6.BookController

package com.zwc.springbootmp.book.controller;


import com.baomidou.mybatisplus.core.conditions.query.QueryWrapper;
import com.zwc.springbootmp.book.model.MvcBook;
import com.zwc.springbootmp.book.service.MvcBookService;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.web.bind.annotation.*;

import java.util.List;

/**
 * 

* 前端控制器 *

* * @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 list(){ return bookService.list(); } // 按条件查询 @GetMapping("/listByCondition") public List 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); } }

                2.6.7.测试

SSM如何_第7张图片

 SSM如何_第8张图片

 SSM如何_第9张图片

SSM如何_第10张图片

 

 3、Mybatisplus中使用Mybatis实现多表连查的功能

        3.1.BookMapper.xml





    
    
        
        
        
    

    
    
        bid, bname, price
    
    
    



        3.2.BookMapper

package com.zwc.springbootmp.book.mapper;

import com.zwc.springbootmp.book.model.MvcBook;
import com.baomidou.mybatisplus.core.mapper.BaseMapper;
import org.springframework.stereotype.Repository;

import java.util.List;
import java.util.Map;

/**
 * 

* Mapper 接口 *

* */ @Repository public interface MvcBookMapper extends BaseMapper { List queryUserRole(Map map); }

        3.3.BookService

package com.zwc.springbootmp.book.service;

import com.zwc.springbootmp.book.model.MvcBook;
import com.baomidou.mybatisplus.extension.service.IService;

import java.util.List;
import java.util.Map;

/**
 * 

* 服务类 *

* */ public interface MvcBookService extends IService { List queryUserRole(Map map); }

        3.4.BookServiceImpl

package com.zwc.springbootmp.book.service.impl;

import com.zwc.springbootmp.book.model.MvcBook;
import com.zwc.springbootmp.book.mapper.MvcBookMapper;
import com.zwc.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;

/**
 * 

* 服务实现类 *

* */ @Service public class MvcBookServiceImpl extends ServiceImpl implements MvcBookService { @Autowired private MvcBookMapper mvcBookMapper; @Override public List queryUserRole(Map map) { return mvcBookMapper.queryUserRole(map); } }

        3.5.BookController

package com.zwc.springbootmp.book.controller;


import com.baomidou.mybatisplus.core.conditions.query.QueryWrapper;
import com.zwc.springbootmp.book.model.MvcBook;
import com.zwc.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;

/**
 * 

* 前端控制器 *

* */ @RestController @RequestMapping("/book/mvc-book") public class MvcBookController { @Autowired private MvcBookService bookService; // 查询所有 @GetMapping("/list") public List list(){ return bookService.list(); } // 按条件查询 @GetMapping("/listByCondition") public List 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 get(String uname){ // 前端传了一个张三 Map map = new HashMap(); map.put("username",uname); return bookService.queryUserRole(map); } }

SSM如何_第11张图片

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