【Spring Boot 从入门到放弃】整合mybatis plus

首先要把需要的jar文件都弄过来，pom.xml需要的东西如下

pom.xml(不完整) 只是需要依赖的

    com.baomidou
    mybatisplus-spring-boot-starter
    1.0.4


    com.baomidou
    mybatis-plus
    2.1.2


    org.springframework.boot
    spring-boot-starter-jdbc





    com.alibaba
    druid
    1.1.3



   mysql
   mysql-connector-java
   runtime


   org.mybatis.spring.boot
   mybatis-spring-boot-starter
   1.3.1

添加mybatis相关的配置，如账号、密码等。这里我使用了application.yml来配 如果不懂yml可以参考【Spring Boot 从入门到放弃】yml 配置文件

application.yml

 datasource:
    driver-class-name: com.mysql.jdbc.Driver
    username: root
    password: root
    url: jdbc:127.0.0.1://mysqldb:3306/db?useUnicode=true&characterEncoding=utf-8
    type: com.alibaba.druid.pool.DruidDataSource   #这里是配置druid连接池，以下都是druid的配置信息
    filters: stat,wall,log4j
    maxActive: 20
    initialSize: 1
    maxWait: 60000
    minIdle: 1
    timeBetweenEvictionRunsMillis: 60000
    minEvictableIdleTimeMillis: 300000
    validationQuery: select 'x'
    testWhileIdle: true
    testOnBorrow: false
    testOnReturn: false
    poolPreparedStatements: true
    maxOpenPreparedStatements: 20
    connection-properties: druid.stat.merggSql=ture;druid.stat.slowSqlMillis=5000

#mybatis
mybatis:
  mapper-locations: classpath*:/mapper/**Mapper.xml   #把xml文件放在com.XX.mapper.*中可能会出现找到的问题，这里把他放在resource下的mapper中
  #实体扫描，多个package用逗号或者分号分隔
  typeAliasesPackage: com.xx.entity  #这里是实体类的位置
  configuration:
    map-underscore-to-camel-case: true
    cache-enabled: false
#logging
logging:
  level: warn

mybatis-Plus配置文件------MybatisPlusConfig放在config文件夹内

image.png

MybatisPlusConfig.java

package com.tdx.account_service.config;

import com.alibaba.druid.pool.DruidDataSource;
import com.alibaba.druid.support.http.StatViewServlet;
import com.alibaba.druid.support.http.WebStatFilter;
import com.baomidou.mybatisplus.MybatisConfiguration;
import com.baomidou.mybatisplus.MybatisXMLLanguageDriver;
import com.baomidou.mybatisplus.entity.GlobalConfiguration;
import com.baomidou.mybatisplus.enums.DBType;
import com.baomidou.mybatisplus.plugins.PaginationInterceptor;
import com.baomidou.mybatisplus.plugins.PerformanceInterceptor;
import com.baomidou.mybatisplus.plugins.parser.ISqlParser;
import com.baomidou.mybatisplus.plugins.parser.ISqlParserFilter;
import com.baomidou.mybatisplus.plugins.parser.tenant.TenantHandler;
import com.baomidou.mybatisplus.plugins.parser.tenant.TenantSqlParser;
import com.baomidou.mybatisplus.spring.MybatisSqlSessionFactoryBean;
import com.baomidou.mybatisplus.spring.boot.starter.SpringBootVFS;
import com.baomidou.mybatisplus.toolkit.PluginUtils;
import net.sf.jsqlparser.expression.Expression;
import net.sf.jsqlparser.expression.LongValue;
import org.apache.ibatis.mapping.DatabaseIdProvider;
import org.apache.ibatis.mapping.MappedStatement;
import org.apache.ibatis.plugin.Interceptor;
import org.apache.ibatis.reflection.MetaObject;
import org.mybatis.spring.annotation.MapperScan;
import org.mybatis.spring.boot.autoconfigure.MybatisProperties;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.boot.bind.RelaxedPropertyResolver;
import org.springframework.boot.context.properties.EnableConfigurationProperties;
import org.springframework.boot.web.servlet.FilterRegistrationBean;
import org.springframework.boot.web.servlet.ServletRegistrationBean;
import org.springframework.context.annotation.Bean;
import org.springframework.context.annotation.Configuration;
import org.springframework.core.env.Environment;
import org.springframework.core.io.DefaultResourceLoader;
import org.springframework.core.io.ResourceLoader;
import org.springframework.util.ObjectUtils;
import org.springframework.util.StringUtils;

import javax.sql.DataSource;
import java.sql.SQLException;
import java.util.ArrayList;
import java.util.List;

/**
 * @Description : MybatisPlus配置
 * ---------------------------------
 */
@Configuration
@EnableConfigurationProperties(MybatisProperties.class)
public class MybatisPlusConfig {

    @Autowired
    private Environment environment;
    private RelaxedPropertyResolver propertyResolver;
    @Autowired
    private DataSource dataSource;
    @Autowired
    private MybatisProperties properties;
    @Autowired
    private ResourceLoader resourceLoader = new DefaultResourceLoader();
    @Autowired(required = false)
    private Interceptor[] interceptors;
    @Autowired(required = false)
    private DatabaseIdProvider databaseIdProvider;

    /**
     * @Description : mybatis-plus SQL执行效率插件【生产环境可以关闭】
     * ---------------------------------
     * @Author : Liang.Guangqing
     * @Date : Create in 2017/9/19 13:57
     */
    @Bean
    public PerformanceInterceptor performanceInterceptor() {
        return new PerformanceInterceptor();
    }

    /**
     * 配置DataSource
     * @return
     * @throws SQLException
     */
    @Bean
    public DataSource druidDataSource() throws SQLException {
        this.propertyResolver = new RelaxedPropertyResolver(environment, "spring.datasource.");

        System.out.println("====================注入druid!====================");
        DruidDataSource datasource = new DruidDataSource();
        datasource.setUrl(propertyResolver.getProperty("url"));
        datasource.setDriverClassName(propertyResolver.getProperty("driver-class-name"));
        datasource.setUsername(propertyResolver.getProperty("username"));
        datasource.setPassword(propertyResolver.getProperty("password"));
        datasource.setInitialSize(Integer.valueOf(propertyResolver.getProperty("initial-size")));
        datasource.setMinIdle(Integer.valueOf(propertyResolver.getProperty("min-idle")));
        datasource.setMaxWait(Long.valueOf(propertyResolver.getProperty("max-wait")));
        datasource.setMaxActive(Integer.valueOf(propertyResolver.getProperty("max-active")));
        datasource.setMinEvictableIdleTimeMillis(Long.valueOf(propertyResolver.getProperty("min-evictable-idle-time-millis")));
        try {
            datasource.setFilters(propertyResolver.getProperty("filters"));
        } catch (SQLException e) {
            e.printStackTrace();
        }
        return datasource;
    }

    /**
     * @Description : mybatis-plus分页插件
     * ---------------------------------
     */
    @Bean
    public PaginationInterceptor paginationInterceptor() {
        PaginationInterceptor page = new PaginationInterceptor();
        page.setDialectType("mysql");
        return page;
    }

    /**
     * 这里全部使用mybatis-autoconfigure 已经自动加载的资源。不手动指定
     * 配置文件和mybatis-boot的配置文件同步
     * @return
     */
    @Bean
    public MybatisSqlSessionFactoryBean mybatisSqlSessionFactoryBean() {
        MybatisSqlSessionFactoryBean mybatisPlus = new MybatisSqlSessionFactoryBean();
        mybatisPlus.setDataSource(dataSource);
        mybatisPlus.setVfs(SpringBootVFS.class);
        if (StringUtils.hasText(this.properties.getConfigLocation())) {
            mybatisPlus.setConfigLocation(this.resourceLoader.getResource(this.properties.getConfigLocation()));
        }
        mybatisPlus.setConfiguration(properties.getConfiguration());
        if (!ObjectUtils.isEmpty(this.interceptors)) {
            mybatisPlus.setPlugins(this.interceptors);
        }
        // MP 全局配置，更多内容进入类看注释
        GlobalConfiguration globalConfig = new GlobalConfiguration();
        globalConfig.setDbType(DBType.MYSQL.name());
        // ID 策略 AUTO->`0`("数据库ID自增") INPUT->`1`(用户输入ID") ID_WORKER->`2`("全局唯一ID") UUID->`3`("全局唯一ID")
        globalConfig.setIdType(2);
        mybatisPlus.setGlobalConfig(globalConfig);
        MybatisConfiguration mc = new MybatisConfiguration();
        mc.setDefaultScriptingLanguage(MybatisXMLLanguageDriver.class);
        mybatisPlus.setConfiguration(mc);
        if (this.databaseIdProvider != null) {
            mybatisPlus.setDatabaseIdProvider(this.databaseIdProvider);
        }
        if (StringUtils.hasLength(this.properties.getTypeAliasesPackage())) {
            mybatisPlus.setTypeAliasesPackage(this.properties.getTypeAliasesPackage());
        }
        if (StringUtils.hasLength(this.properties.getTypeHandlersPackage())) {
            mybatisPlus.setTypeHandlersPackage(this.properties.getTypeHandlersPackage());
        }
        if (!ObjectUtils.isEmpty(this.properties.resolveMapperLocations())) {
            mybatisPlus.setMapperLocations(this.properties.resolveMapperLocations());
        }
        return mybatisPlus;
    }

    /**
     * 注册一个StatViewServlet
     * @return
     */
    @Bean
    public ServletRegistrationBean DruidStatViewServle(){
        //org.springframework.boot.context.embedded.ServletRegistrationBean提供类的进行注册.
        ServletRegistrationBean servletRegistrationBean = new ServletRegistrationBean(new StatViewServlet(),"/druid/*");
        //添加初始化参数：initParams
        //白名单：
        // servletRegistrationBean.addInitParameter("allow","127.0.0.1");
        //IP黑名单 (存在共同时，deny优先于allow) : 如果满足deny的话提示:Sorry, you are not permitted to view this page.
        // servletRegistrationBean.addInitParameter("deny","192.168.1.73");
        //登录查看信息的账号密码.
        servletRegistrationBean.addInitParameter("loginUsername","root");
        servletRegistrationBean.addInitParameter("loginPassword","root");
        //是否能够重置数据.
        servletRegistrationBean.addInitParameter("resetEnable","false");
        return servletRegistrationBean;
    }

    /**
     * 注册一个：filterRegistrationBean
     *
     * @return
     */
    @Bean
    public FilterRegistrationBean druidStatFilter(){
        FilterRegistrationBean filterRegistrationBean = new FilterRegistrationBean(new WebStatFilter());
        //添加过滤规则.
        filterRegistrationBean.addUrlPatterns("/*");
        //添加不需要忽略的格式信息.
        filterRegistrationBean.addInitParameter("exclusions","*.js,*.gif,*.jpg,*.png,*.css,*.ico,/druid/*");
        return filterRegistrationBean;
    }
}

注意引入的包，别引错了！

还要开启dao的扫描，很简单，就是在启动文件中添加@MapperScan("com.xxxx.dao*")，如下是完整的启动类

image.png

到这里，配置算是完成了，运行一下项目是可以运行起来的，有问题可以在评论区回复。