16 Mybatis-PLUS MP

16.1 官网

16.2 代码生成器

添加依赖

单元测试
生成器依赖
Freemarker
数据库的驱动
lombok
日志

xml

<?xml version="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 http://maven.apache.org/xsd/maven-4.0.0.xsd">
    <parent>
        <artifactId>mybatis-parent-java1</artifactId>
        <groupId>com.neuedu.mybatis</groupId>
        <version>1.0-SNAPSHOT</version>
    </parent>
    <modelVersion>4.0.0</modelVersion>

    <artifactId>09-mybatis-plus-generator</artifactId>
    <packaging>war</packaging>

    <name>09-mybatis-plus-generator Maven Webapp</name>
    <!-- FIXME change it to the project's website -->
    <url>http://www.example.com</url>

    <properties>
        <project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
        <maven.compiler.source>1.7</maven.compiler.source>
        <maven.compiler.target>1.7</maven.compiler.target>
    </properties>

    <dependencies>
        <dependency>
            <groupId>junit</groupId>
            <artifactId>junit</artifactId>
            <version>4.12</version>
            <scope>test</scope>
        </dependency>

        <dependency>
            <groupId>com.baomidou</groupId>
            <artifactId>mybatis-plus-generator</artifactId>
            <version>3.3.2</version>
        </dependency>

        <dependency>
            <groupId>org.freemarker</groupId>
            <artifactId>freemarker</artifactId>
            <version>2.3.30</version>
        </dependency>

        <dependency>
            <groupId>mysql</groupId>
            <artifactId>mysql-connector-java</artifactId>
            <version>5.1.49</version>
        </dependency>
        <!-- https://mvnrepository.com/artifact/org.slf4j/slf4j-api -->
        <dependency>
            <groupId>org.slf4j</groupId>
            <artifactId>slf4j-api</artifactId>
            <version>1.8.0-beta4</version>
        </dependency>


        <!-- https://mvnrepository.com/artifact/log4j/log4j -->
        <dependency>
            <groupId>log4j</groupId>
            <artifactId>log4j</artifactId>
            <version>1.2.17</version>
        </dependency>



    </dependencies>

    <build>
        <finalName>09-mybatis-plus-generator</finalName>
        <pluginManagement><!-- lock down plugins versions to avoid using Maven defaults (may be moved to parent pom) -->
            <plugins>
                <plugin>
                    <artifactId>maven-clean-plugin</artifactId>
                    <version>3.1.0</version>
                </plugin>
                <!-- see http://maven.apache.org/ref/current/maven-core/default-bindings.html#Plugin_bindings_for_war_packaging -->
                <plugin>
                    <artifactId>maven-resources-plugin</artifactId>
                    <version>3.0.2</version>
                </plugin>
                <plugin>
                    <artifactId>maven-compiler-plugin</artifactId>
                    <version>3.8.0</version>
                </plugin>
                <plugin>
                    <artifactId>maven-surefire-plugin</artifactId>
                    <version>2.22.1</version>
                </plugin>
                <plugin>
                    <artifactId>maven-war-plugin</artifactId>
                    <version>3.2.2</version>
                </plugin>
                <plugin>
                    <artifactId>maven-install-plugin</artifactId>
                    <version>2.5.2</version>
                </plugin>
                <plugin>
                    <artifactId>maven-deploy-plugin</artifactId>
                    <version>2.8.2</version>
                </plugin>
            </plugins>
        </pluginManagement>
    </build>
</project>

设置log4j的配置文件

properties

log4j.rootLogger=DEBUG, stdout  


log4j.appender.stdout=org.apache.log4j.ConsoleAppender  
log4j.appender.stdout.layout=org.apache.log4j.PatternLayout  
log4j.appender.stdout.layout.ConversionPattern=[%p]\:%d{HH:mm:ss} %c(%L\u884C) %m%n

自定义以生成逻辑

java

package com.neuedu.mp.generator;


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;
import java.util.logging.Logger;

// 演示例子，执行 main 方法控制台输入模块表名回车自动生成对应项目目录中
public class CodeGenerator {

    /**
     * <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)) {
                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();

        // 全局配置
        GlobalConfig gc = new GlobalConfig();
//        String projectPath = System.getProperty("user.dir");
        final String projectPath ="C:\\Users\\Administrator\\Desktop\\mp";
        gc.setOutputDir(projectPath + "/src/main/java");
        gc.setAuthor("金山");
        gc.setOpen(false);
        // gc.setSwagger2(true); 实体属性 Swagger2 注解
        mpg.setGlobalConfig(gc);

        // 数据源配置
        DataSourceConfig dsc = new DataSourceConfig();
        dsc.setUrl("jdbc:mysql://localhost:3306/ssm-java1?useUnicode=true&useSSL=false&characterEncoding=utf8");
        // dsc.setSchemaName("public");
        dsc.setDriverName("com.mysql.jdbc.Driver");
        dsc.setUsername("root");
        dsc.setPassword("root");
        mpg.setDataSource(dsc);

        // 包配置
        PackageConfig pc = new PackageConfig();
        final String pack = "com.neuedu.his";
//        pc.setModuleName(scanner("模块名"));
        pc.setParent(pack);
        mpg.setPackageInfo(pc);

        // 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";
        // 如果模板引擎是 velocity
        // String templatePath = "/templates/mapper.xml.vm";

        // 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！！
                return projectPath + "/src/main/resources/mapper/"+pack.replace(".","/") +"/" + tableInfo.getEntityName() + "Mapper" + StringPool.DOT_XML;
            }
        });
        /*
        cfg.setFileCreate(new IFileCreate() {
            @Override
            public boolean isCreate(ConfigBuilder configBuilder, FileType fileType, String filePath) {
                // 判断自定义文件夹是否需要创建
                checkDir("调用默认方法创建的目录，自定义目录用");
                if (fileType == FileType.MAPPER) {
                    // 已经生成 mapper 文件判断存在，不想重新生成返回 false
                    return !new File(filePath).exists();
                }
                // 允许生成模板文件
                return true;
            }
        });
        */
        cfg.setFileOutConfigList(focList);
        mpg.setCfg(cfg);

        // 配置模板
        TemplateConfig templateConfig = new TemplateConfig();

        // 配置自定义输出模板
        //指定自定义模板路径，注意不要带上.ftl/.vm, 会根据使用的模板引擎自动识别
        // templateConfig.setEntity("templates/entity2.java");
        // templateConfig.setService();
        // templateConfig.setController();

        templateConfig.setXml(null);
        mpg.setTemplate(templateConfig);

        // 策略配置
        StrategyConfig strategy = new StrategyConfig();
        strategy.setNaming(NamingStrategy.underline_to_camel);
        strategy.setColumnNaming(NamingStrategy.underline_to_camel);
//        strategy.setSuperEntityClass("你自己的父类实体,没有就不用设置!");
        strategy.setEntityLombokModel(true);
//        strategy.setRestControllerStyle(true);
        // 公共父类
//        strategy.setSuperControllerClass("你自己的父类控制器,没有就不用设置!");
        // 写于父类中的公共字段
//        strategy.setSuperEntityColumns("id");
//        strategy.setInclude(scanner("表名，多个英文逗号分割").split(","));  //默认生成所有表的
        strategy.setControllerMappingHyphenStyle(true);
//        strategy.setTablePrefix(pc.getModuleName() + "_");
        mpg.setStrategy(strategy);
        mpg.setTemplateEngine(new FreemarkerTemplateEngine());
        mpg.execute();
    }

}

16.3 在Sringmvc中使用 MP

使用ssm集成 MP

将mybaits调换为 MP（Mybatis-PLUS）

将mybatis的依赖替换成 MP的依赖
删除mybatis、mybatis-spring pagehelper

xml

<!--mybatis-plus -->
<dependency>
    <groupId>com.baomidou</groupId>
    <artifactId>mybatis-plus</artifactId>
    <version>3.4.2</version>
</dependency>

<!-- 日志 -->
 <!-- https://mvnrepository.com/artifact/org.slf4j/slf4j-api -->
        <dependency>
            <groupId>org.slf4j</groupId>
            <artifactId>slf4j-api</artifactId>
            <version>1.8.0-beta4</version>
        </dependency>


        <!-- https://mvnrepository.com/artifact/log4j/log4j -->
        <dependency>
            <groupId>log4j</groupId>
            <artifactId>log4j</artifactId>
            <version>1.2.17</version>
        </dependency>

修改SQLSessionFactory

xml

<bean id="sqlSessionFactory" class="com.baomidou.mybatisplus.extension.spring.MybatisSqlSessionFactoryBean">
        <property name="dataSource" ref="dataSource"/>
        <property name="mapperLocations" value="classpath:com/neuedu/his/mapper/*.xml"/>
        <property name="typeAliasesPackage" value="com.neuedu.his.entity"/>
    </bean>

修改MapperScannerConfigurer扫描的Mapper包

xml

    <bean class="org.mybatis.spring.mapper.MapperScannerConfigurer">
        <property name="basePackage" value="com.neuedu.his.mapper"/>
    </bean>

单元测试

package com.neuedu.his.controller;


import com.neuedu.his.service.IMenuService;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.web.bind.annotation.RequestMapping;

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

import java.util.List;

/**
 * <p>
 * 菜单 前端控制器
 * </p>
 *
 * @author 金山
 * @since 2021-03-30
 */
@RestController
@RequestMapping("/menu")
public class MenuController {

    @Autowired
    IMenuService menuService;


    /**
     *  http://127.0.0.1:8080/mp/menu/list
     * @return
     */
    @RequestMapping("list")
    List list(){
        return menuService.list();
    }


}

16.4 自定义sql

MP是对mybatis无侵入是的封装，自定义sql与mybatis原生的sql用法一样，定义Mapper.java、定义Mapper.java

16.5 分页

在IOC容器中给SQLSessionFactory 注入分页插件

xml

 <bean id="sqlSessionFactory" class="com.baomidou.mybatisplus.extension.spring.MybatisSqlSessionFactoryBean">
        <property name="dataSource" ref="dataSource"/>
        <property name="mapperLocations" value="classpath:com/neuedu/his/mapper/*.xml"/>
        <property name="typeAliasesPackage" value="com.neuedu.his.entity"/>

        <property name="plugins">
            <array>
                <ref bean="mybatisPlusInterceptor"/>
            </array>
        </property>
    </bean>
    
    <bean id="mybatisPlusInterceptor" class="com.baomidou.mybatisplus.extension.plugins.MybatisPlusInterceptor">
        <property name="interceptors">
            <list>
                <ref bean="paginationInnerInterceptor"/>
            </list>
        </property>
    </bean>
    <!--分页插件-->
    <bean id="paginationInnerInterceptor" class="com.baomidou.mybatisplus.extension.plugins.inner.PaginationInnerInterceptor">
        <constructor-arg name="dbType" value="MYSQL"/>
    </bean>

测试代码

java

@Test
    public void page(){

        Integer pageNum = 2;
        Integer pageSize = 5;
        IPage<Menu> page = new Page(pageNum,pageSize);

        page = menuService.page(page);
        List<Menu>  list = page.getRecords();
        for (Menu menu : list) {
            System.out.println(menu);
        }
    }

16.7 自定义sql的分页

在Mapper.xml 自定义sql。

xml

    <select id="userSelectListPage" resultMap="resultMap">
        select * from menu 
    </select>

在Mapper.java

java

Page<Menu> userSelectListPage(Page page);

在service中使用

java

getBaseMapper().userSelectListPage(page);

如果想在自定义sql中使用QueryWrapper封装的 where条件则代码如下：

Mapper.xml

xml

  <select id="userSelectListPage" resultMap="resultMap">
        select * from menu ${ew.customSqlSegment}
    </select>

Mapper.java

java

    Page<Menu> userSelectListPage(Page page, @Param(Constants.WRAPPER) Wrapper wrapper);

Service

 @Override
    public Page<Menu> userSelectListPage(Page page, Wrapper wrapper) {
        return getBaseMapper().userSelectListPage(page,wrapper);
    }

测试代码

@Test
    public void userSelectListPage(){

        Integer pageNum = 1;
        Integer pageSize = 5;
        Page<Menu> page = new Page(pageNum,pageSize);

        QueryWrapper wrapper = new QueryWrapper();
        wrapper.like("menu_name","管理");
        page = menuService.userSelectListPage(page, wrapper);

        List<Menu>  list = page.getRecords();
        for (Menu menu : list) {
            System.out.println(menu);
        }
    }

17 日志

日志：可以按需的打印日志

常见的日志类库:

log4j
log4j2
logback
common-logging
jdk-log
Slf4J :日志的框架，抽象的,跟不同的日志的组件整合（log4j、logback）

17.1 SLF4J 整合log4j

添加依赖

xml

<dependency>
  <groupId>org.slf4j</groupId>
  <artifactId>slf4j-api</artifactId>
  <version>1.7.21</version>
</dependency>
<dependency>
  <groupId>org.slf4j</groupId>
  <artifactId>slf4j-log4j12</artifactId>
  <version>1.7.21</version>
</dependency>
<dependency>
  <groupId>log4j</groupId>
  <artifactId>log4j</artifactId>
  <version>1.2.17</version>
</dependency>

编辑log4j的日志配置文件
配置文件详解：https://my.oschina.net/u/3359365/blog/1559125

properties




> 总的配置开关，级别 trace  debug info warn  error falat
log4j.rootLogger=INFO, stdout  

>设置不同包的打印之日的 级别
log4j.logger.com.neuedu.his.service=ALL

>打印的外观
log4j.appender.stdout=org.apache.log4j.ConsoleAppender  
log4j.appender.stdout.layout=org.apache.log4j.PatternLayout  
log4j.appender.stdout.layout.ConversionPattern=[%p]\:%d{HH:mm:ss} %c(%L\u884C) %m%n

程序中使用日志框架

java

package com.neuedu.his.service;

import lombok.extern.slf4j.Slf4j;

import org.junit.Test;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;

@Slf4j
public class Log4jTest {

    Logger log = LoggerFactory.getLogger(Log4jTest.class);

    @Test
    public void test(){
        log.trace("trace");
        log.debug("debug");
        log.info("info");
        log.warn("warn");
        log.error("error");
       
    }

}

lombok 对日志的支持，可以在类上面声明 @Slf4j注解，相当于在类中声明了log对象

16 Mybatis-PLUS MP ​

16.1 官网 ​

16.2 代码生成器 ​

16.3 在Sringmvc中使用 MP ​

16.4 自定义sql ​

16.5 分页 ​

16.7 自定义sql的分页 ​

17 日志 ​

17.1 SLF4J 整合log4j ​

16 Mybatis-PLUS MP

16.1 官网

16.2 代码生成器

16.3 在Sringmvc中使用 MP

16.4 自定义sql

16.5 分页

16.7 自定义sql的分页

17 日志

17.1 SLF4J 整合log4j