项目执行中，统计sql执行时间，用于排查执行时间过长的sql 进行优化

本文链接：https://blog.youkuaiyun.com/s853204755/article/details/107059109

本文介绍了一个自定义的MyBatis SQL拦截器，用于记录SQL执行时间和异常信息，通过实现Interceptor接口并使用@Intercepts注解指定拦截的目标方法。

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package com.jmed.o2o.dao.plugin;

import org.apache.ibatis.plugin.*;
import org.slf4j.Logger;
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.session.ResultHandler;
import org.apache.ibatis.session.RowBounds;
import org.slf4j.LoggerFactory;

import java.util.Properties;


@Intercepts(value = {
        @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 }),
        @Signature(type = Executor.class, method = "query", args = { MappedStatement.class, Object.class,
                RowBounds.class, ResultHandler.class, CacheKey.class, BoundSql.class }) })
public class SqlStatementInterceptor implements Interceptor {
    private static Logger logger = LoggerFactory.getLogger(SqlStatementInterceptor.class);

    @Override
    public Object intercept(Invocation invocation) {
        MappedStatement mappedStatement = (MappedStatement) invocation.getArgs()[0];
        String sqlId = mappedStatement.getId();
        // 开始时间
        long start = System.currentTimeMillis();
        try {
            return invocation.proceed();
        } catch (Exception e) {
            logger.error(sqlId + "执行失败！", e);
            return null;
        } finally {
            long end = System.currentTimeMillis();
            long time = end - start;
            StringBuilder str = new StringBuilder();
            str.append(sqlId);
            str.append(": ");
            str.append("sql执行时长： ");
            str.append(time);
            str.append(" ms.");
            String sqlInfo = str.toString();
            logger.debug(sqlInfo);
        }
    }

    @Override
    public Object plugin(Object arg0) {
        return Plugin.wrap(arg0, this);
    }

    @Override
    public void setProperties(Properties arg0) {

    }