SpringBoot+Mybatis

　　最近一直在面试

　　遇到一个机试要求整合SpringBoot+MyBatis的公司，就顺便整理一下吧。(采用Mybatis配置文件版，比较熟悉这种开发)

　　开发工具 IDEA

　　一.建立基本框架

　　

勾选Lombok便于实体类get，set方法

　　1.改application.properties为yml文件，在yml文件中加入druid配置信息

spring:
  datasource:
#   数据源基本配置
    username: root
    password: root
    driver-class-name: com.mysql.jdbc.Driver
    url: jdbc:mysql://localhost:3306/mybatis1?useUnicode=true&useJDBCCompliantTimezoneShift=true&useLegacyDatetimeCode=false&serverTimezone=UTC
    type: com.alibaba.druid.pool.DruidDataSource
#   数据源其他配置
    initialSize: 5
    minIdle: 5
    maxActive: 20
    maxWait: 60000
    timeBetweenEvictionRunsMillis: 60000
    minEvictableIdleTimeMillis: 300000
    validationQuery: SELECT 1 FROM DUAL
    testWhileIdle: true
    testOnBorrow: false
    testOnReturn: false
    poolPreparedStatements: true
#   配置监控统计拦截的filters，去掉后监控界面sql无法统计，'wall'用于防火墙
    filters: stat,wall,log4j
    maxPoolPreparedStatementPerConnectionSize: 20
    useGlobalDataSourceStat: true
    connectionProperties: druid.stat.mergeSql=true;druid.stat.slowSqlMillis=500

　　

　　　　

　　2.修改pom

　　　　引入阿里连接池druid和log4j依赖

　　　　　　　　　　<!-- https://mvnrepository.com/artifact/com.alibaba/druid -->
		<dependency>
			<groupId>com.alibaba</groupId>
			<artifactId>druid</artifactId>
			<version>1.1.8</version>
		</dependency>
		<!-- https://mvnrepository.com/artifact/log4j/log4j -->
		<dependency>
			<groupId>log4j</groupId>
			<artifactId>log4j</artifactId>
			<version>1.2.17</version>
		</dependency>

　　3.添加druid的配置类

　　

package com.zhh.springbootmybatis.config;

import com.alibaba.druid.pool.DruidDataSource;
import com.alibaba.druid.support.http.StatViewServlet;
import com.alibaba.druid.support.http.WebStatFilter;
import org.springframework.boot.autoconfigure.SpringBootApplication;
import org.springframework.boot.context.properties.ConfigurationProperties;
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 javax.sql.DataSource;
import java.util.Arrays;
import java.util.HashMap;
import java.util.Map;

/**
 * @Author zhh
 * @Date 2019/7/19 12:28
 * @Version 1.0
 **/
@Configuration
public class DruidConfig
{
    @ConfigurationProperties(prefix = "spring.datasource")
    @Bean
    public DataSource druid(){
        return  new DruidDataSource();
    }

    //配置Druid的监控
    //1、配置一个管理后台的Servlet
    @Bean
    public ServletRegistrationBean statViewServlet(){
        ServletRegistrationBean bean = new ServletRegistrationBean(new StatViewServlet(), "/druid/*");
        Map<String,String> initParams = new HashMap<>();

        initParams.put("loginUsername","admin");
        initParams.put("loginPassword","123456");
        initParams.put("allow","");//默认就是允许所有访问
        initParams.put("deny","192.168.1.102");//拒绝访问的ip地址，这里我写了本机ip

        bean.setInitParameters(initParams);
        return bean;
    }


    //2、配置一个web监控的filter
    @Bean
    public FilterRegistrationBean webStatFilter(){
        FilterRegistrationBean bean = new FilterRegistrationBean();
        bean.setFilter(new WebStatFilter());

        Map<String,String> initParams = new HashMap<>();
        initParams.put("exclusions","*.js,*.css,/druid/*");

        bean.setInitParameters(initParams);

        bean.setUrlPatterns(Arrays.asList("/*"));

        return  bean;
    }

}

　　4.启动一下

　　　　

　

　　二、数据库mybatis1

　　　　1.建表，这里弄了两个表employee，department

　　　　　　数据库语句

　　　　　　　　　　　　

DROP TABLE IF EXISTS `department`;
CREATE TABLE `department` (
  `id` int(11) NOT NULL AUTO_INCREMENT,
  `departmentName` varchar(255) DEFAULT NULL,
  PRIMARY KEY (`id`)
) ENGINE=InnoDB DEFAULT CHARSET=utf8;

-- ----------------------------
-- Records of department
-- ----------------------------

-- ----------------------------
-- Table structure for employee
-- ----------------------------
DROP TABLE IF EXISTS `employee`;
CREATE TABLE `employee` (
  `id` int(11) NOT NULL AUTO_INCREMENT,
  `lastName` varchar(255) DEFAULT NULL,
  `email` varchar(255) DEFAULT NULL,
  `gender` int(2) DEFAULT NULL,
  `d_id` int(11) DEFAULT NULL,
  PRIMARY KEY (`id`)
) ENGINE=InnoDB DEFAULT CHARSET=utf8;

　　　　2.mybatis全局配置文件mybatis-config.xml

　　　　

<?xml version="1.0" encoding="UTF-8" ?>
<!DOCTYPE configuration
        PUBLIC "-//mybatis.org//DTD Config 3.0//EN"
        "http://mybatis.org/dtd/mybatis-3-config.dtd">
<configuration>

    <settings>
        <setting name="mapUnderscoreToCamelCase" value="true"/>
    </settings>
</configuration>

　　　　3.mybatis逆向生成

　　　　　　　　3.1pom中设置插件

　　　　　　　　　　

<plugin>
				<groupId>org.mybatis.generator</groupId>
				<artifactId>mybatis-generator-maven-plugin</artifactId>
				<version>1.3.7</version>
				<!--声明配置文件xml的位置-->
				<configuration>
					<configurationFile>src/main/resources/mybatis/generatorConfig.xml</configurationFile>
				</configuration>
			</plugin>

　　　　　　　　3.2 mybatis逆向生成配置文件内容

generatorConfig.xml
　　　　　　　　

<?xml version="1.0" encoding="UTF-8"?>
<!DOCTYPE generatorConfiguration
        PUBLIC "-//mybatis.org//DTD MyBatis Generator Configuration 1.0//EN"
        "http://mybatis.org/dtd/mybatis-generator-config_1_0.dtd">
<!--利用MyBatis Generator里面的Xml文件格式，复制成为resource的xml文件，并进行修改-->
<generatorConfiguration>
    <!--找到MySQL驱动包的路径-->
    <classPathEntry location="G:dataSourcedataSourceDrivermysql-connector-java-5.1.47.jar" />
    <!--配置连接MySQL数据库的信息-->
    <context id="inputdb" targetRuntime="MyBatis3">
        <jdbcConnection driverClass="com.mysql.jdbc.Driver"
                        connectionURL="jdbc:mysql://localhost:3306/mybatis1"
                        userId="root"
                        password="root">
        </jdbcConnection>
        <!--会将数据库里的int类型数据转换为Java里的bigDecimals -->
        <javaTypeResolver >
            <property name="forceBigDecimals" value="false" />
        </javaTypeResolver>
        <!--配置各个文件的相对路径和项目路径-->
        <!--产生实体类，需要和App是同级的-->
        <javaModelGenerator targetPackage="com.zhh.springbootmybatis2.entity" targetProject="src/main/java">
            <property name="enableSubPackages" value="true" />
            <property name="trimStrings" value="true" />
        </javaModelGenerator>
        <!--映射文件，一定是在resources中的-->
        <sqlMapGenerator targetPackage="mapper"  targetProject="src/main/resources/mybatis">
            <property name="enableSubPackages" value="true" />
        </sqlMapGenerator>
        <!--底层dao-->
        <javaClientGenerator type="XMLMAPPER" targetPackage="com.zhh.springbootmybatis2.dao"  targetProject="src/main/java">
            <property name="enableSubPackages" value="true" />
        </javaClientGenerator>

        <!--将example类型设为false，否则实体类里面会多一个example的类exampleStudent -->
        <!--表明为数据库的表明，生成实体类Student，会自动生成到entity的目录中-->
        <table tableName="employee" domainObjectName="Employee" enableCountByExample="false" enableDeleteByExample="false" enableSelectByExample="false" enableUpdateByExample="false">
        </table>
        <table tableName="department" domainObjectName="Department" enableCountByExample="false" enableDeleteByExample="false" enableSelectByExample="false" enableUpdateByExample="false">
        </table>


    </context>
</generatorConfiguration>

　　　　　　　3.3 执行

一般就能成功，不成功根据异常百度解决