springboot-mybatis

本文讲解mybatis的基本使用，mybatis-generater的使用，druid连接和sql监控。

数据库请使用utf8mb4，可以尽量避免各种异常。

基础准备

pom引用

第一步肯定是要引用jar文件了。

1、引入mybaits

                <!--mybatis-->
        <dependency>
            <groupId>org.mybatis.spring.boot</groupId>
            <artifactId>mybatis-spring-boot-starter</artifactId>
            <version>1.1.1</version>
        </dependency>
        <dependency>
            <groupId>mysql</groupId>
            <artifactId>mysql-connector-java</artifactId>
        </dependency>
        <dependency>
            <groupId>com.alibaba</groupId>
            <artifactId>druid</artifactId>
            <version>1.0.26</version>
        </dependency>
        <!--lombok-->
        <dependency>
            <groupId>org.projectlombok</groupId>
            <artifactId>lombok</artifactId>
            <version>1.18.4</version>
        </dependency>

2、引入mybatis-generater

                <dependency>
            <groupId>org.mybatis.generator</groupId>
            <artifactId>mybatis-generator-core</artifactId>
            <version>1.3.7</version>
            <scope>provided</scope>
        </dependency>
            <!--mybatis.generator maven插件-->
            <plugin>
                <groupId>org.mybatis.generator</groupId>
                <artifactId>mybatis-generator-maven-plugin</artifactId>
                <version>1.3.7</version>
                <configuration>
                    <configurationFile>src/main/resources/mybatis-generator.xml</configurationFile>
                    <overwrite>true</overwrite>
                </configuration>
                <dependencies>
                    <dependency>
                        <groupId>mysql</groupId>
                        <artifactId>mysql-connector-java</artifactId>
                        <version>8.0.12</version>
                    </dependency>
                    <dependency>
                        <groupId>com.itfsw</groupId>
                        <artifactId>mybatis-generator-plugin</artifactId>
                        <version>1.3.7</version>
                    </dependency>
                </dependencies>
            </plugin>

application.yml配置数据源

spring:
  datasource:
    type: com.alibaba.druid.pool.DruidDataSource
    driver-class-name: com.mysql.jdbc.Driver
    url: jdbc:mysql://127.0.0.1:3306/user?useUnicode=true&characterEncoding=utf8&useSSL=false
    username: 
    password: 
    #下面为连接池补充设置
    initialSize: 5
    # 配置获取连接等待超时的时间   
    maxWait: 60000
    # 配置间隔多久才进行一次检测，检测需要关闭的空闲连接，单位是毫秒
    timeBetweenEvictionRunsMillis: 60000
    # 配置一个连接在池中最小生存的时间，单位是毫秒 
    minEvictableIdleTimeMillis: 300000
    validationQuery: SELECT 1 FROM DUAL
    testWhileIdle: true
    testOnBorrow: false
    testOnReturn: false
    # 打开PSCache，并且指定每个连接上PSCache的大小
    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
    # 通过connectProperties属性来打开mergeSql功能；慢SQL记录
    connectionProperties: config.stat.mergeSql=true;config.stat.slowSqlMillis=5000
    # 合并多个DruidDataSource的监控数据 
    useGlobalDataSourceStat: true
mybatis:
  type-aliases-package: com.alvin.entity
  mapper-locations: classpath:mapper/*Mapper.xml
# 设置debug模式下打印mysql
logging:
  level:
    com:
      alvin:
        mapper: debug

mapper扫描

加入注解：@MapperScan(“com.alvin.mapper”)

@SpringBootApplication
@MapperScan("com.alvin.mapper")
public class Application {
    public static void main(String[] args) {
        SpringApplication.run(Application.class, args);
    }
}

配置druid连接池

配置druid的连接池和页面监控

DruidDataSourceConfiguration 连接池

import javax.sql.DataSource;
import org.springframework.boot.context.properties.ConfigurationProperties;
import org.springframework.context.annotation.Bean;
import org.springframework.context.annotation.Configuration;
import org.springframework.context.annotation.Primary;
import com.alibaba.druid.pool.DruidDataSource;
@Configuration
public class DruidDataSourceConfiguration {
    @Bean
    @Primary
    @ConfigurationProperties(prefix = "spring.datasource")
    public DataSource druidDataSource() {
        DruidDataSource druidDataSource = new DruidDataSource();
        return druidDataSource;
    }
}

DruidStatFilter 过滤规则

import javax.servlet.annotation.WebFilter;
import javax.servlet.annotation.WebInitParam;
import com.alibaba.druid.support.http.WebStatFilter;
/**
 * 配置druid过滤规则
 * @author Administrator
 *
 */
@WebFilter(filterName="druidWebStatFilter",urlPatterns="/*",
        initParams={
                @WebInitParam(name="exclusions",value="*.js,*.gif,*.jpg,*.bmp,*.png,*.css,*.ico,/config/*")// 忽略资源
        })
public class DruidStatFilter extends WebStatFilter {
}

DruidStatViewServlet 监控页面

import javax.servlet.annotation.WebInitParam;
import javax.servlet.annotation.WebServlet;
import com.alibaba.druid.support.http.StatViewServlet;
/**
 * 配置druid页面配置
 * @author Administrator
 *
 */
@SuppressWarnings("serial")
@WebServlet(urlPatterns = "/druid/*",
        initParams={
                @WebInitParam(name="allow",value="192.168.1.20,127.0.0.1"),// IP白名单 (没有配置或者为空，则允许所有访问)
                @WebInitParam(name="deny",value="192.168.16.111"),// IP黑名单 (存在共同时，deny优先于allow)
                @WebInitParam(name="loginUsername",value="admin"),// 用户名
                @WebInitParam(name="loginPassword",value="admin"),// 密码
                @WebInitParam(name="resetEnable",value="false")// 禁用HTML页面上的“Reset All”功能
        })
public class DruidStatViewServlet extends StatViewServlet {
}

查看druid监控

启动application，输入http://localhost:8080/druid/sql.html，输入用户名和密码，bingo！。

idea插件

推荐：free mybatis plugin，可以自由在mapper和xml中跳转。

效果：

mapper文件

xml文件