SpringBoot与mybatis整合以及mybatis-plus

一、ssm和springboot整合

1.整合Mybatis

1.确保项目启动成功

pom依赖

		<dependency>
            <groupId>mysqlgroupId>
            <artifactId>mysql-connector-javaartifactId>
            <version>5.1.44version>
        dependency>

添加依赖时可能遇到的问题：

若编译遇到这种情况可以在pom.xml中加入以下代码

		

		<plugin>
            <groupId>org.apache.maven.pluginsgroupId>
            <artifactId>maven-surefire-pluginartifactId>
            <configuration>
                <skipTests>trueskipTests>
            configuration>
        plugin>

若遇到其他情况也有可能会是版本问题可以尝试降低springboot版本到3.0以下

application.yml

mybatis:
    mapper-locations: classpath:mappers/**/*.xml
    type-aliases-package: com.zking.testspringboot03.mybatis.entity
server:
    port: 8082
spring:
    application:
        name: testspringboot03
    datasource:
        driver-class-name: com.mysql.jdbc.Driver
        url: jdbc:mysql://localhost:3306/mybatis_ssm?useUnicode=true&characterEncoding=UTF-8
        password: 123456
        username: root
logging:
    level:
        com.zking.testspringboot03: debug

2.代码生成

jdbc.properties

jdbc.driver=com.mysql.jdbc.Driver
jdbc.url=jdbc:mysql://localhost:3306/mybatis_ssm?useUnicode=true&characterEncoding=UTF-8
jdbc.username=root
jdbc.password=123456

generatorConfig数据库逆向生成插件

generatorConfig.xml

DOCTYPE generatorConfiguration PUBLIC "-//mybatis.org//DTD MyBatis Generator Configuration 1.0//EN"
        "http://mybatis.org/dtd/mybatis-generator-config_1_0.dtd" >
<generatorConfiguration>
    
    <properties resource="jdbc.properties"/>

    
    <classPathEntry location="D:\\SoftwareInstallPath\\repository\\mvn_repository\\mysql\\mysql-connector-java\\5.1.44\\mysql-connector-java-5.1.44.jar"/>

    
    <context id="infoGuardian">
        
        <commentGenerator>
            <property name="suppressAllComments" value="true"/>
            <property name="suppressDate" value="true"/> 
        commentGenerator>

        
        <jdbcConnection driverClass="${jdbc.driver}"
                        connectionURL="${jdbc.url}" userId="${jdbc.username}" password="${jdbc.password}"/>

        
        <javaTypeResolver>
            
            <property name="forceBigDecimals" value="false"/>
        javaTypeResolver>

        
        
        
        <javaModelGenerator targetPackage="com.zking.testspringboot03.model"
                            targetProject="src/main/java">
            
            <property name="enableSubPackages" value="false"/>
            
            <property name="constructorBased" value="true"/>
            
            <property name="trimStrings" value="false"/>
            
            <property name="immutable" value="false"/>
        javaModelGenerator>

        
        
        <sqlMapGenerator targetPackage="/mappers"
                         targetProject="src/main/resources">
            
            <property name="enableSubPackages" value="false"/>
        sqlMapGenerator>

        
        
        
        
        <javaClientGenerator targetPackage="com.zking.testspringboot03.mapper"
                             targetProject="src/main/java" type="XMLMAPPER">
            
            <property name="enableSubPackages" value="false"/>
        javaClientGenerator>

        
        
        
        
        
        
        
        
        
        
        
        
        

        <table schema="" tableName="t_mvc_book" domainObjectName="Book"
               enableCountByExample="false" enableDeleteByExample="false"
               enableSelectByExample="false" enableUpdateByExample="false">
        table>

    context>
generatorConfiguration>

pom.xml

<plugin>
                <groupId>org.mybatis.generatorgroupId>
                <artifactId>mybatis-generator-maven-pluginartifactId>
                <version>1.3.2version>
                <dependencies>
                    
                    <dependency>
                        <groupId>mysqlgroupId>
                        <artifactId>mysql-connector-javaartifactId>
                        <version>5.1.44version>
                    dependency>
                dependencies>
                <configuration>
                    <overwrite>trueoverwrite>
                configuration>
            plugin>

3.测试

利用Eolink进行测试

package com.zking.testspringboot03.web;

import com.zking.testspringboot03.mapper.BookMapper;
import com.zking.testspringboot03.model.Book;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.web.bind.annotation.*;

/**
 * @author小李飞刀
 * @site www.javaxl.com
 */
@RestController
@RequestMapping("/jdbc")
public class JdbcController {

    @Autowired
    public BookMapper bookMapper;

    @GetMapping("/get")
    public Book list(Integer bid){
        return bookMapper.selectByPrimaryKey(bid);
    }

    @DeleteMapping("/delete")
    public int delete(Integer bid){
        return bookMapper.deleteByPrimaryKey(bid);
    }

    @PutMapping("/add")
    public int add(Book book){
        return bookMapper.insertSelective(book);
    }
}

启动类

@MapperScan("com.zking.testspringboot03.mapper")
@EnableTransactionManagement
@SpringBootApplication
public class Testspringboot03Application {

    public static void main(String[] args) {
        SpringApplication.run(Testspringboot03Application.class, args);
    }

}

2.Mybatis-plus简介

官网

https://baomidou.com/

3.整合Mybatis-plus

Mybatis-plus相关配置如下

pom.xml

<dependency>
            <groupId>com.baomidougroupId>
            <artifactId>mybatis-plus-boot-starterartifactId>
            <version>3.4.2version>
        dependency>
        <dependency>
            <groupId>com.baomidougroupId>
            <artifactId>mybatis-plus-generatorartifactId>
            <version>3.4.1version>
        dependency>
        <dependency>
            <groupId>org.freemarkergroupId>
            <artifactId>freemarkerartifactId>
            <version>2.3.31version>
        dependency>

application.yml

server:
    port: 8082
spring:
    application:
        name: testspringboot03
    datasource:
        driver-class-name: com.mysql.jdbc.Driver
        url: jdbc:mysql://localhost:3306/mybatis_ssm?useUnicode=true&characterEncoding=UTF-8
        password: 123456
        username: root
logging:
    level:
        com.zking.demo: debug
mybatis-plus:
    mapper-locations: classpath:mappers/**/*.xml
    type-aliases-package: com.zking.demo.book.model

Mybatis-plus代码生成类

package com.zking.demo.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;

/**
 * mybatis-plus代码生成
 */
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") + "/testspboot03";
        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("lky");

        // 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/mybatis_ssm?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);
        }
        pc.setParent("com.zking.demo")
                .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();
    }
}

生成出来的代码如下

MvcBookMapper.xml

DOCTYPE mapper PUBLIC "-//mybatis.org//DTD Mapper 3.0//EN" "http://mybatis.org/dtd/mybatis-3-mapper.dtd">
<mapper namespace="com.zking.demo.book.mapper.MvcBookMapper">

    
    <resultMap id="BaseResultMap" type="com.zking.demo.book.model.MvcBook">
        <id column="bid" property="bid" />
        <result column="bname" property="bname" />
        <result column="price" property="price" />
    resultMap>

    
    <sql id="Base_Column_List">
        bid, bname, price
    sql>

mapper>

MvcBookMapper.java

package com.zking.demo.book.mapper;

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

@Repository
public interface MvcBookMapper extends BaseMapper<MvcBook> {

}

MvcBookService.java

package com.zking.demo.book.service;

import com.zking.demo.book.model.MvcBook;
import com.baomidou.mybatisplus.extension.service.IService;

public interface MvcBookService extends IService<MvcBook> {

}

MvcBookServiceImpl.java

package com.zking.demo.book.service.impl;

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

@Service
public class MvcBookServiceImpl extends ServiceImpl<MvcBookMapper, MvcBook> implements MvcBookService {

}

MvcBookController.java

package com.zking.demo.book.controller;


import org.springframework.web.bind.annotation.RequestMapping;

import org.springframework.web.bind.annotation.RestController;

@RestController
@RequestMapping("/book/mvc-book")
public class MvcBookController {

}

完成基本增删改查方法开发

MvcBookController.java开发

package com.zking.demo.book.controller;


import com.baomidou.mybatisplus.core.conditions.query.QueryWrapper;
import com.zking.demo.book.model.MvcBook;
import com.zking.demo.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
 * 
 *
 * @author lky
 * @since 2022-10-30
 */
@RestController
@RequestMapping("/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){
        QueryWrapper w = new QueryWrapper();
        w.like("bname",book.getBname());
        return bookService.list(w);
    }

//    查询单个
    @GetMapping("/load")
    public MvcBook load(MvcBook book){
        QueryWrapper w = new QueryWrapper();
        w.like("bid",book.getBid());
        return bookService.getOne(w);
    }

//    增加
    @PutMapping("/add")
    public boolean add(MvcBook book){
        boolean save = bookService.save(book);
        return save;
    }

    //    修改
    @PostMapping("/update")
    public boolean update(MvcBook book){
        boolean save = bookService.saveOrUpdate(book);
        return save;
    }

    //    删除
    @DeleteMapping("/delete")
    public boolean delete(MvcBook book){
        boolean save = bookService.removeById(book.getBid());
        return save;
    }

    // 连表查询
    @GetMapping("/userRole")
    public List<Map> userRole(String uname){
        Map map = new HashMap();
        map.put("username",uname);
        List<Map> maps = bookService.queryUserRole(map);
        return maps;
    }
}

完成之后用Eolink进行测试

Mybatis-plus中依然可以兼容使用Mybatis的相关功能，测试代码如下

public interface MvcBookService extends IService<MvcBook> {
    List<Map> queryUserRole(Map map);
}

@Service
public class MvcBookServiceImpl extends ServiceImpl<MvcBookMapper, MvcBook> implements MvcBookService {
    @Autowired
    private MvcBookMapper bookMapper;
    public List<Map> queryUserRole(Map map){
        return bookMapper.queryUserRole(map);
    }
}

@Repository
public interface MvcBookMapper extends BaseMapper<MvcBook> {
    List<Map> queryUserRole(Map map);
}

    <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>