程序员必看内容连续集之 SpringBoot03 SSM整合SpringBoot

目录

一、整合Mybatis

二、整合Mybatisplus

三、Mybatisplus中使用Mybatis实现多表连查的功能

一、整合Mybatis

我们使用SSM框架如何整合SpringBoot？接下来进行详细操作上车！

①创建一个SpringBoot项目并勾选五个配置

 ②修改pom依赖，降低MySQl版本

低版本MySQL：

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

③修改application.yml

application.yml：

mybatis:
    mapper-locations: classpath:mappers/*xml
    type-aliases-package: com.zq.springboot03.mybatis.entity
server:
    port: 8080
spring:
    application:
        name: springboot03
    datasource:
#        driver-class-name: com.mysql.cj.jdbc.Driver
        driver-class-name: com.mysql.jdbc.Driver
        name: defaultDataSource
        password: 123456
        url: jdbc:mysql://localhost:3306/mybatis_ssm?serverTimezone=UTC
        username: root

④逆向生成配置（添加配置文件以及POM依赖，修改扫描）

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.xml：

"1.0" encoding="UTF-8" ?>
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:\\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.zq.springboot03.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="com.zq.springboot03.mapper"
                         targetProject="src/main/resources/mappers">
            
            <property name="enableSubPackages" value="false"/>
        sqlMapGenerator>
 
        
        
        
        
        <javaClientGenerator targetPackage="com.zq.springboot03.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>

添加POM依赖：

         
            <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>

因为我们使用了SpringBoot所以我们逆向生成的XML扫描位置不同：

⑤修改maven命令与配置

 

 ⑥yml与xml文件的返回类型相对应

application.yml：

mybatis:
#    mapper-locations: classpath:mappers/*xml
    mapper-locations: classpath:mappers/**/*xml
#    type-aliases-package: com.zq.springboot03.mybatis.entity
    type-aliases-package: com.zq.springboot03.model
server:
    port: 8080
spring:
    application:
        name: springboot03
    datasource:
#        driver-class-name: com.mysql.cj.jdbc.Driver
        driver-class-name: com.mysql.jdbc.Driver
        name: defaultDataSource
        password: 123456
        url: jdbc:mysql://localhost:3306/mybatis_ssm?serverTimezone=UTC
        username: root

整合完成我们写一个controller 进行验证

BookController ：

package com.zq.springboot03.controller;
 
import com.zq.springboot03.mapper.BookMapper;
import com.zq.springboot03.model.Book;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.web.bind.annotation.*;
 
/**
 * @author张强
 * @site www.zq.com
 */
@RestController
@RequestMapping("/mybatis")
public class BookController {
 
    @Autowired
    public BookMapper bookMapper;
 
    //查询
    @GetMapping("/get")
    public Book list(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.insertSelective(book);
    }
}

我们写完响应类会需开启扫描：

package com.zq.springboot03;
 
import org.mybatis.spring.annotation.MapperScan;
import org.springframework.boot.SpringApplication;
import org.springframework.boot.autoconfigure.SpringBootApplication;
import org.springframework.transaction.annotation.EnableTransactionManagement;
 
@MapperScan("com.zq.Springboot03.mapper")
@EnableTransactionManagement
@SpringBootApplication
public class Springboot03Application {
    public static void main(String[] args) {
        SpringApplication.run(Springboot03Application.class, args);
    }
 
}

 使用测试工具测试的结果：整合成功！ 

二、整合Mybatisplus

Mybatisplus简介：

①官网地址：https://baomidou.com/

②MyBatis-Plus (opens new window)（简称 MP）是一个 MyBatis (opens new window)的增强工具，在 MyBatis 的基础上只做增强不做改变，为简化开发、提高效率而生。

 ③特性：有些非常实用！！！

• 无侵入：只做增强不做改变，引入它不会对现有工程产生影响，如丝般顺滑
• 损耗小：启动即会自动注入基本 CURD，性能基本无损耗，直接面向对象操作
• 强大的 CRUD 操作：内置通用 Mapper、通用 Service，仅仅通过少量配置即可实现单表大部分 CRUD 操作，更有强大的条件构造器，满足各类使用需求
• 支持 Lambda 形式调用：通过 Lambda 表达式，方便的编写各类查询条件，无需再担心字段写错
• 支持主键自动生成：支持多达 4 种主键策略（内含分布式唯一 ID 生成器 - Sequence），可自由配置，完美解决主键问题
• 支持 ActiveRecord 模式：支持 ActiveRecord 形式调用，实体类只需继承 Model 类即可进行强大的 CRUD 操作
• 支持自定义全局通用操作：支持全局通用方法注入（ Write once, use anywhere ）
• 内置代码生成器：采用代码或者 Maven 插件可快速生成 Mapper 、 Model 、 Service 、 Controller 层代码，支持模板引擎，更有超多自定义配置等您来使用
• 内置分页插件：基于 MyBatis 物理分页，开发者无需关心具体操作，配置好插件之后，写分页等同于普通 List 查询
• 分页插件支持多种数据库：支持 MySQL、MariaDB、Oracle、DB2、H2、HSQL、SQLite、Postgre、SQLServer 等多种数据库
• 内置性能分析插件：可输出 SQL 语句以及其执行时间，建议开发测试时启用该功能，能快速揪出慢查询
• 内置全局拦截插件：提供全表 delete 、 update 操作智能分析阻断，也可自定义拦截规则，预防误操作

 我们继续重点使用SpringBoot与MybatisPlus进行整合

①创建SpringBoot项目勾选不同组件

 ②添加逆向生成pom配置文件并降低MySQL版本

 pom.xml：

"1.0" encoding="UTF-8"?>
<project xmlns="http://maven.apache.org/POM/4.0.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
         xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 https://maven.apache.org/xsd/maven-4.0.0.xsd">
    <modelVersion>4.0.0modelVersion>
    <groupId>com.zqgroupId>
    <artifactId>springbootmybatisplusartifactId>
    <version>0.0.1-SNAPSHOTversion>
    <name>springbootmybatisplusname>
    <description>Demo project for Spring Bootdescription>
 
    <properties>
        <java.version>1.8java.version>
        <project.build.sourceEncoding>UTF-8project.build.sourceEncoding>
        <project.reporting.outputEncoding>UTF-8project.reporting.outputEncoding>
        <spring-boot.version>2.3.7.RELEASEspring-boot.version>
    properties>
 
    <dependencies>
        <dependency>
            <groupId>org.springframework.bootgroupId>
            <artifactId>spring-boot-starter-jdbcartifactId>
        dependency>
        <dependency>
            <groupId>org.springframework.bootgroupId>
            <artifactId>spring-boot-starter-webartifactId>
        dependency>
        <dependency>
            <groupId>com.baomidougroupId>
            <artifactId>mybatis-plus-boot-starterartifactId>
            <version>3.4.2version>
        dependency>
    
        <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>
 
        <dependency>
            <groupId>mysqlgroupId>
            <artifactId>mysql-connector-javaartifactId>
            <version>5.1.44version>
        dependency>
        <dependency>
            <groupId>org.projectlombokgroupId>
            <artifactId>lombokartifactId>
            <optional>trueoptional>
        dependency>
        <dependency>
            <groupId>org.springframework.bootgroupId>
            <artifactId>spring-boot-starter-testartifactId>
            <scope>testscope>
            <exclusions>
                <exclusion>
                    <groupId>org.junit.vintagegroupId>
                    <artifactId>junit-vintage-engineartifactId>
                exclusion>
            exclusions>
        dependency>
    dependencies>
 
    <dependencyManagement>
        <dependencies>
            <dependency>
                <groupId>org.springframework.bootgroupId>
                <artifactId>spring-boot-dependenciesartifactId>
                <version>${spring-boot.version}version>
                <type>pomtype>
                <scope>importscope>
            dependency>
        dependencies>
    dependencyManagement>
 
    <build>
        <plugins>
            <plugin>
                <groupId>org.apache.maven.pluginsgroupId>
                <artifactId>maven-compiler-pluginartifactId>
                <version>3.8.1version>
                <configuration>
                    <source>1.8source>
                    <target>1.8target>
                    <encoding>UTF-8encoding>
                configuration>
            plugin>
            <plugin>
                <groupId>org.springframework.bootgroupId>
                <artifactId>spring-boot-maven-pluginartifactId>
                <version>2.3.7.RELEASEversion>
                <configuration>
                    <mainClass>com.zq.springbootmybatisplus.SpringbootmybatisplusApplicationmainClass>
                configuration>
                <executions>
                    <execution>
                        <id>repackageid>
                        <goals>
                            <goal>repackagegoal>
                        goals>
                    execution>
                executions>
            plugin>
        plugins>
    build>
 
project>

③修改application.yml文件

server:
    port: 8080
spring:
    application:
        name: springbootmp
    datasource:
        driver-class-name: com.mysql.jdbc.Driver
        password: 123456
        url: jdbc:mysql://localhost:3306/mybatis_ssm?useUnicode=true&characterEncoding=UTF-8
        username: root
logging:
    level:
        com.zking.demo: debug
mybatis-plus:
    mapper-locations: classpath:mappers/**/*.xml
    type-aliases-package: com.zq.springbootmybatisplus.book.model
 

④新建一个mp的包 放入代码生成的类（在官网的代码生成中修改得出来的）

修改这个文件

MPGenerator ：

package com.zq.springbootmybatisplus.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") + "/springbootmybatisplus";
        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);
        }
        //配置父包
        pc.setParent("com.zq.springbootmybatisplus")
                .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();
    }
}

⑤创建mappers存放xml文件

⑥然后运行MPGenerator类的main的方法

其中里面是没有sql方法和对于的接口类方法等，因为这些基本的增删改查已经别一个接口封装好了，自动继承了，所以基本的增删改查都可以用

⑦测试：

MvcBookController：

package com.zq.springbootmybatisplus.book.controller;
 
 
import com.baomidou.mybatisplus.core.conditions.query.QueryWrapper;
import com.zq.springbootmybatisplus.book.model.MvcBook;
import com.zq.springbootmybatisplus.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 lky
 * @since 2022-11-04
 */
@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){
        //如果使用的市mybatis 那么需要写SQL语句
        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);
        return bookService.getById(book.getBid());
    }
 
    //    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;
    }
}

SpringbootmybatisplusApplication：（打开扫描）

package com.zq.springbootmybatisplus;
 
import org.mybatis.spring.annotation.MapperScan;
import org.springframework.boot.SpringApplication;
import org.springframework.boot.autoconfigure.SpringBootApplication;
import org.springframework.transaction.annotation.EnableTransactionManagement;
 
@MapperScan("com.zq.springbootmybatisplus.book.mapper")
@EnableTransactionManagement
@SpringBootApplication
public class SpringbootmybatisplusApplication {
 
    public static void main(String[] args) {
        SpringApplication.run(SpringbootmybatisplusApplication.class, args);
    }
 
}

使用测试工具测试结果：（查询）

 

三、Mybatisplus中使用Mybatis实现多表连查的功能

MvcBookMapper.xml

    <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>

 MvcBookService 

package com.zq.springbootmybatisplus.book.service;
 
import com.baomidou.mybatisplus.extension.service.IService;
import com.zq.springbootmybatisplus.book.model.MvcBook;
 
import java.util.List;
import java.util.Map;
 
/**
 * 
 *  服务类
 * 
 *
 * @author zq
 * @since 2022-11-01
 */
public interface MvcBookService extends IService {
    //多表联查
    List
}

 MvcBookServiceImpl 

package com.zq.springbootmybatisplus.book.service.impl;
 
import com.baomidou.mybatisplus.extension.service.impl.ServiceImpl;
import com.zq.springbootmybatisplus.book.mapper.MvcBookMapper;
import com.zq.springbootmybatisplus.book.model.MvcBook;
import com.zq.springbootmybatisplus.book.service.MvcBookService;
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
 * 
 *
 * @author zq
 * @since 2022-11-01
 */
@Service
public class MvcBookServiceImpl extends ServiceImpl implements MvcBookService {
    @Autowired
    private MvcBookMapper bookMapper;
    public List
        return bookMapper.queryUserRole(map);
    }
}

 MvcBookMapper 

package com.zq.springbootmybatisplus.book.mapper;
 
import com.baomidou.mybatisplus.core.mapper.BaseMapper;
import com.zq.springbootmybatisplus.book.model.MvcBook;
import org.springframework.stereotype.Repository;
 
import java.util.List;
import java.util.Map;
 
/**
 * 
 *  Mapper 接口
 * 
 *
 * @author zq
 * @since 2022-11-01
 */
@Repository
public interface MvcBookMapper extends BaseMapper {
    //多表联查
    List
}

MvcBookController加入一个方法

//多表联查 用户账户对应角色的功能  论证mybatisplus一样可以使用mybatis
    @GetMapping("/userRole")
    public List
        Map map = new HashMap();
        map.put("username",uname);
        List
        return maps;
    }

测试结果：