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java通过拦截器实现项目每次执行sql耗时统计,可配置是否打印

2024-01-18 00:15| 来源: 网络整理| 查看: 265

目录

前言 

实现的效果

默认设置

完整代码 

 配置文件

代码简要分析 

前言 

 我们平常在跑项目的时候,有时候一不留神,写了一个慢sql,导致整个系统变的很慢,但是我们有不知道是哪个sql导致的,这段代码,就能够实现我们想要的功能

既可以统计sql耗时,又可以定位到执行sql的是哪段代码,还可以拿到完整替换过?号的完整sql,直接复制下来,就能够在sql执行器里面执行,然后你就可以通过explain去分析为什么慢了,是不是因为索引导致的等等

还有你们平常用到的idea的mybatis log插件,将?号替换成完整sql也是通过这个逻辑完成的

实现的效果1.时间超过n秒的要打印,n秒通过配置形式2.可配置打印级别info/debug3.Sql打印日志开关,如果为关就不打印sql日志4.日志格式:耗时、sql执行的所在dao层和方法、sql完整语句默认设置执行时间>=3s,要打印sqlInfo级别默认开关为开,打印sql日志格式:eg:执行sql耗时:5023 ms - id:com.xxxx.xxxx.getXxxxx - Sql:select id,name,age from student完整代码 package cn.zygxsq.example.common.mybatis; import lombok.extern.slf4j.Slf4j; import org.apache.ibatis.cache.CacheKey; import org.apache.ibatis.executor.Executor; import org.apache.ibatis.mapping.BoundSql; import org.apache.ibatis.mapping.MappedStatement; import org.apache.ibatis.mapping.ParameterMapping; import org.apache.ibatis.mapping.ParameterMode; import org.apache.ibatis.plugin.*; import org.apache.ibatis.reflection.MetaObject; import org.apache.ibatis.session.Configuration; import org.apache.ibatis.session.ResultHandler; import org.apache.ibatis.session.RowBounds; import org.apache.ibatis.type.TypeHandlerRegistry; import org.springframework.beans.factory.annotation.Value; import org.springframework.stereotype.Component; import java.text.DateFormat; import java.text.SimpleDateFormat; import java.util.Date; import java.util.List; import java.util.regex.Matcher; @Slf4j @Component @Intercepts({ @Signature(type = Executor.class, method = "update", args = {MappedStatement.class, Object.class}), @Signature(type = Executor.class, method = "query", args = {MappedStatement.class, Object.class, RowBounds.class, ResultHandler.class, CacheKey.class, BoundSql.class}), @Signature(type = Executor.class, method = "query", args = {MappedStatement.class, Object.class, RowBounds.class, ResultHandler.class}), @Signature(type = Executor.class, method = "queryCursor", args = {MappedStatement.class, Object.class, RowBounds.class}) }) public class ExecutorSqlInterceptor implements Interceptor { /** * 超过该时间打印sql */ @Value("${mybatis.sql.log.time}") private BigDecimal logTime; /** * 日志级别 */ @Value("${mybatis.sql.log.logLevel}") private String logLevel; /** * 日志开关 */ @Value("${mybatis.sql.log.switch}") private String logSwitch; /** * DATE_FORMAT */ private static final DateFormat DATE_FORMAT = new SimpleDateFormat("yyyy-MM-dd HH:mm:ss"); /** * 关 */ private static final String SWITCH_FALSE = "false"; @Override public Object intercept(Invocation invocation) throws Throwable { try { if (SWITCH_FALSE.equalsIgnoreCase(logSwitch)){ return invocation.proceed(); } long start = System.currentTimeMillis(); Object result = invocation.proceed(); long end = System.currentTimeMillis(); long timing = end - start; // 打印3s以上的sql语句 BigDecimal timingBigDecimal = new BigDecimal(timing); BigDecimal maxTime = logTime.multiply(new BigDecimal("1000")); if (timingBigDecimal.compareTo(maxTime)>=0) { MappedStatement mappedStatement = (MappedStatement) invocation.getArgs()[0]; Object parameterObject = null; if (invocation.getArgs().length > 1) { parameterObject = invocation.getArgs()[1]; } String statementId = mappedStatement.getId(); BoundSql boundSql = mappedStatement.getBoundSql(parameterObject); Configuration configuration = mappedStatement.getConfiguration(); String sql = getSql(boundSql, parameterObject, configuration); switch (logLevel){ case "debug": if (log.isDebugEnabled()){ log.debug("执行sql耗时:{} ms - id:{} - Sql:{}", timing, statementId, sql); } break; default: if (log.isInfoEnabled()){ log.info("执行sql耗时:{} ms - id:{} - Sql:{}", timing, statementId, sql); } } } return result; }catch (Exception e){ log.error("拦截sql异常:",e); } return invocation.proceed(); } @Override public Object plugin(Object target) { return Plugin.wrap(target, this); } private String getSql(BoundSql boundSql, Object parameterObject, Configuration configuration) { String sql = boundSql.getSql().replaceAll("[\\s]+", " "); List parameterMappings = boundSql.getParameterMappings(); TypeHandlerRegistry typeHandlerRegistry = configuration.getTypeHandlerRegistry(); if (parameterMappings != null) { for (int i = 0; i < parameterMappings.size(); i++) { ParameterMapping parameterMapping = parameterMappings.get(i); if (parameterMapping.getMode() != ParameterMode.OUT) { Object value; String propertyName = parameterMapping.getProperty(); if (boundSql.hasAdditionalParameter(propertyName)) { value = boundSql.getAdditionalParameter(propertyName); } else if (parameterObject == null) { value = null; } else if (typeHandlerRegistry.hasTypeHandler(parameterObject.getClass())) { value = parameterObject; } else { MetaObject metaObject = configuration.newMetaObject(parameterObject); value = metaObject.getValue(propertyName); } sql = replacePlaceholder(sql, value); } } } return sql; } private String replacePlaceholder(String sql, Object propertyValue) { String result; if (propertyValue != null) { if (propertyValue instanceof String) { result = "'" + propertyValue + "'"; } else if (propertyValue instanceof Date) { result = "'" + DATE_FORMAT.format(propertyValue) + "'"; } else { result = propertyValue.toString(); } } else { result = "null"; } return sql.replaceFirst("\\?", Matcher.quoteReplacement(result)); } } 配置文件######慢sql日志打印 #超过该事件打印,单位s mybatis.sql.log.time=3 #打印级别,info/debug mybatis.sql.log.logLevel=info #是否打印日志开关,true开,false关 mybatis.sql.log.switch=true代码简要分析 @Intercepts({ @Signature(type = Executor.class, method = "update", args = {MappedStatement.class, Object.class}), @Signature(type = Executor.class, method = "query", args = {MappedStatement.class, Object.class, RowBounds.class, ResultHandler.class, CacheKey.class, BoundSql.class}), @Signature(type = Executor.class, method = "query", args = {MappedStatement.class, Object.class, RowBounds.class, ResultHandler.class}), @Signature(type = Executor.class, method = "queryCursor", args = {MappedStatement.class, Object.class, RowBounds.class}) })

 @Intercepts注解只有一个属性,即value,其返回值类型是一个@Signature类型的数组,表示我们可以配置多个@Signature注解。

@Signature注解其实就是一个方法签名,其共有三个属性,分别为:

type指接口的class,

method指接口中的方法名,

args指的是方法参数类型(该属性返回值是一个数组)。

 顾名思义,上述就是,我要拦截Executor这个类的update、query、queryCursor这个4个方法

大家可以看下Executor这个类里面是不是有这4个方法

 update和query大家应该都知道是增删改查,queryCursor主要是执行存储过程用的。

里面的具体方法是做什么的,可以参考一下这篇博客:

Mybatis源码解读系列(五)-Executor__微风轻起的博客-CSDN博客

参考文章:

springboot-Mybatis实现SQL拦截并打印SQL语句及优化_cnds_li的博客-CSDN博客_springboot拦截sql语句

Java Invocation.proceed方法代码示例 - 纯净天空



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