P6Spy简介

P6Spy是一个可以用来在应用程序中拦截和修改数据操作语句的开源框架。

通过P6Spy可以对SQL语句进行拦截，相当于一个SQL语句的记录器，这样我们可以用它来作相关的分析，比如性能分析。

应用场景

pom

<dependencies><dependency><groupId>org.springframework.boot</groupId><artifactId>spring-boot-starter</artifactId></dependency><dependency><groupId>org.springframework.boot</groupId><artifactId>spring-boot-starter-test</artifactId><scope>test</scope></dependency><dependency><groupId>com.alibaba</groupId><artifactId>druid-spring-boot-starter</artifactId><version>1.1.20</version></dependency><dependency><groupId>mysql</groupId><artifactId>mysql-connector-java</artifactId></dependency><dependency><groupId>com.baomidou</groupId><artifactId>mybatis-plus-boot-starter</artifactId><version>3.1.1</version></dependency><dependency><groupId>org.projectlombok</groupId><artifactId>lombok</artifactId></dependency><dependency><groupId>p6spy</groupId><artifactId>p6spy</artifactId><version>3.8.2</version></dependency><dependency><groupId>com.alibaba</groupId><artifactId>fastjson</artifactId><version>1.2.83</version></dependency></dependencies>

application.yml

spring:datasource:driver-class-name: com.mysql.cj.jdbc.Driver#driver-class-name: com.p6spy.engine.spy.P6SpyDrivertype: com.alibaba.druid.pool.DruidDataSourceurl: jdbc:mysql://localhost:3306/course_db?serverTimezone=GMT%2B8# url: jdbc:p6spy:mysql://localhost:3306/course_db?serverTimezone=GMT%2B8username: rootpassword: root# 打开mybatis-plus的sql日志输出
mybatis-plus:configuration:log-impl: org.apache.ibatis.logging.stdout.StdOutImpl

entity

@Data
@NoArgsConstructor
@AllArgsConstructor
@TableName("course_1")
public class Course {@TableField("cid")private Long cId;private String cName;private Integer userId;private String cStatus;
}

Mapper

public interface CourseMapper extends BaseMapper<Course> {
}

启动类

@SpringBootApplication
@MapperScan(basePackages = "cn.zysheep.mapper")
public class ShardingjdbcdemoApplication {public static void main(String[] args) {SpringApplication.run(ShardingjdbcdemoApplication.class, args);}
}

测试类

@SpringBootTest
@Slf4j
class ShardingjdbcdemoApplicationTests {@Autowiredprivate CourseMapper courseMapper;@SneakyThrows@Testvoid findCourse() {courseMapper.selectList(null).forEach(System.out::println);}
}

mybatis-plus也可以打印输出的sql日志，但是不是我们想要的效果，如何来控制想要的sql日志输出，可以使用P6Spy开源产品。

P6Spy入门使用

spy.properties

resources目录添加配置文件，类似log4j.xml，记录配置信息

module.log=com.p6spy.engine.logging.P6LogFactory,com.p6spy.engine.outage.P6OutageFactory
# sql日志打印输出
# 1、logMessageFormat=com.p6spy.engine.spy.appender.SingleLineFormat
# 2、logMessageFormat=com.p6spy.engine.spy.appender.CustomLineFormat
# customLogMessageFormat=%(currentTime) | SQL use time: %(executionTime) ms | connect info: %(category)-%(connectionId) | execute sql: %(sql)
# 3、自定义日志打印(全限定类名)
logMessageFormat=cn.zysheep.config.P6SPYConfig
# 使用日志系统记录sql
appender=com.p6spy.engine.spy.appender.Slf4JLogger
## 配置记录Log例外
excludecategories=info,debug,result,batc,resultset
# 设置使用p6spy driver来做代理
deregisterdrivers=true
# 日期格式
dateformat=yyyy-MM-dd HH:mm:ss
# 实际驱动
driverlist=com.mysql.cj.jdbc.Driver
# 是否开启慢SQL记录
outagedetection=true
# 慢SQL记录标准 秒
outagedetectioninterval=2

P6Spy有内置的SQL输出格式，如上配置文件。这里我们使用自定义SQL日志打印

P6SPYConfig

public class P6SPYConfig  implements MessageFormattingStrategy {@Overridepublic String formatMessage(int connectionId, String now, long elapsed, String category, String prepared, String sql, String url) {Map<String, Object> message = new LinkedHashMap<>(8);String newPrepared = prepared.replace("   ", "").replace("\n", " ");message.put("prepared", newPrepared);String newSql = sql.replace("   ", "").replace("\n", " ");message.put("sql", newSql);return JSONObject.toJSONString(message, true);}
}

application.yml

spring:datasource:# driver-class-name: com.mysql.cj.jdbc.Driverdriver-class-name: com.p6spy.engine.spy.P6SpyDrivertype: com.alibaba.druid.pool.DruidDataSource#  url: jdbc:mysql://localhost:3306/course_db?serverTimezone=GMT%2B8url: jdbc:p6spy:mysql://localhost:3306/course_db?serverTimezone=GMT%2B8username: rootpassword: root# 打开mybatis-plus的sql日志输出
mybatis-plus:configuration:log-impl: org.apache.ibatis.logging.stdout.StdOutImpl

测试类不变