SpringBoot整合MyBatis及SpringBoot,通用Mapper,逆向工程,分页插件的使用

引入SpringBoot,通用Mapper,逆向工程,分页插件所依赖的jar包

1.在pop.xml文件中引入以下jar包
<dependencies>
        
        <dependency>
            <groupId>org.springframework.bootgroupId>
            <artifactId>spring-boot-starter-webartifactId>
        dependency>
        <dependency>
            <groupId>org.springframework.bootgroupId>
            <artifactId>spring-boot-starter-testartifactId>
            <scope>testscope>
        dependency>
        
        <dependency>
            <groupId>com.alibabagroupId>
            <artifactId>druidartifactId>
            <version>1.1.0version>
        dependency>
        <dependency>
            <groupId>com.alibabagroupId>
            <artifactId>druid-spring-boot-starterartifactId>
            <version>1.1.9version>
        dependency>
        
        <dependency>
            <groupId>com.alibabagroupId>
            <artifactId>fastjsonartifactId>
            <version>1.2.47version>
        dependency>
        
        <dependency>
            <groupId>mysqlgroupId>
            <artifactId>mysql-connector-javaartifactId>
            <version>5.1.41version>
        dependency>
        
        
        <dependency>
            <groupId>org.mybatis.spring.bootgroupId>
            <artifactId>mybatis-spring-boot-starterartifactId>
            <version>1.3.1version>
        dependency>
        
        <dependency>
            <groupId>org.mybatis.generatorgroupId>
            <artifactId>mybatis-generator-coreartifactId>
            <version>1.3.2version>
            <scope>compilescope>
            <optional>trueoptional>
        dependency>
        
        <dependency>
            <groupId>tk.mybatisgroupId>
            <artifactId>mapper-spring-boot-starterartifactId>
            <version>1.2.4version>
        dependency>
        
        <dependency>
            <groupId>com.github.pagehelpergroupId>
            <artifactId>pagehelper-spring-boot-starterartifactId>
            <version>1.2.3version>
        dependency>
        
        <dependency>
            <groupId>org.springframework.bootgroupId>
            <artifactId>spring-boot-starter-data-redisartifactId>
        dependency>
 dependencies>
2.引入插件
     
      <plugin>
          <groupId>org.springframework.bootgroupId>
          <artifactId>spring-boot-maven-pluginartifactId>
      plugin>
      
      <plugin>
          <groupId>org.mybatis.generatorgroupId>
          <artifactId>mybatis-generator-maven-pluginartifactId>
          <version>1.3.2version>
          <configuration>
              <verbose>trueverbose>
              <overwrite>trueoverwrite>
          configuration>
          <dependencies>
              <dependency>
                  <groupId>mysqlgroupId>
                  <artifactId>mysql-connector-javaartifactId>
                  <version>5.1.29version>
              dependency>
              <dependency>
                  <groupId>tk.mybatisgroupId>
                  <artifactId>mapperartifactId>
                  <version>4.0.0version>
              dependency>
          dependencies>
      plugin>

创建generatorConfig.xml配置文件

3.


<generatorConfiguration>
    
    
    
    
    
    
    

    <context id="default" targetRuntime="MyBatis3Simple" defaultModelType="flat">
        <property name="beginningDelimiter" value="`"/>
        <property name="endingDelimiter" value="`"/>
        <plugin type="tk.mybatis.mapper.generator.MapperPlugin">
            <property name="mappers" value="com.xxx.util.MyMapper"/>
        plugin>

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

        
        <jdbcConnection  driverClass="com.mysql.jdbc.Driver" connectionURL="jdbc:mysql://localhost:3306/myjdbc?characterEncoding=utf-8" userId="root" password="123456">
        jdbcConnection>


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


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

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

        

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

        <table tableName="users" domainObjectName="User" enableCountByExample="false" enableUpdateByExample="false" enableDeleteByExample="false" enableSelectByExample="false" selectByExampleQueryId="false">table>
    context>
generatorConfiguration>

对MaBatis与通用Mapper和分页插件的配置

4.完成generatorConfig.xml的配置以后 就可以使用逆向工程了 如果要使用分页插件 还需要另外配置
  在application.properties中(或application.yml)进行通用mapper和分页插件的配置,在这里就用
  .yml的方式进行配置
#端口号的配置
server:
  port: 8095
#一般会将本地与服务器上不同的配置分开来配置 这样就只需要切换active就可以了
spring:
  profiles:
    active: dev
  #连接池的配置 
  datasource:
    driver-class-name: com.mysql.jdbc.Driver
    druid:
       initial-size: 2

#mybatis
mybatis:
  type-aliases-package: com.lanou.bean
  mapper-locations: classpath:mappers/*.xml #mappers mapper: mappers: com.lanou.util.MyMapper not-empty: false identity: MYSQL #pagehelper pagehelper: helperDialect: mysql reasonable: true supportMethodsArguments: true params: count: countSql page: 3

分页插件的使用

5. 分页查询与模糊查询
    @RequestMapping(value = "/selectByPage")
    @ResponseBody
    public List selectByPage(Integer page, User user){
        PageHelper.startPage(page,size);
        // 告诉系统查询那个类
        Example example = new Example(User.class);
        // 创建查询
        Example.Criteria criteria = example.createCriteria();
        // 模糊查询的判断
        if (!StringUtils.isEmptyOrWhitespaceOnly(user.getUsername())){
            criteria.andLike("username","%"+user.getUsername()+"%");
        }
        example.orderBy("password").desc();
        return userMapper.selectByExample(example);
    }

通用Mapper的使用

6.(1.创建util包,在该包下创建MyMapper类并集成Mapper,MySqlMapper 如下:
package com.xxx.util;
import tk.mybatis.mapper.common.Mapper;
import tk.mybatis.mapper.common.MySqlMapper;

public interface MyMapper<T> extends Mapper<T>,MySqlMapper<T> {

}
(2.在使用逆向工程生成的dao层接口中集成MyMapper 如下:
package com.xxx.dao;
import com.lanou.bean.User;
import com.lanou.util.MyMapper;
import java.util.List;

public interface UserMapper extends MyMapper<User> {
    public List selectByDeleteId();
}

SpringBoot启动类的使用

7.// 默认情况下会扫描应用启动类所在的包以及子包下的内容
  // 如果不符合我们扫描的范围可以通过设置注解@ComponentScan的basePackage属性来改变我们的扫描范围
@SpringBootApplication
@ComponentScan(basePackages = {"com.xxx.controller","com.xxx.ck","com.xxx.bean"})
//扫描dao层下的Mapper需要加上该注解 讲dao的bean(对象)注入Spring容器
@MapperScan(basePackages = "com.xxx.dao") 
public class Springboot01Application {
    public static void main(String[] args) {
        SpringApplication.run(Springboot01Application.class, args);
    }
}