MySQL跟踪SQL&慢查询分析工具

C#

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2019-5-22

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简介

之前的工作一直使用的SQL SERVER, 用过的都知道，SQL SERVER有配套的SQL跟踪工具SQL Profiler，开发或者定位BUG过程中，可以在操作页面的时候，实时查看数据库执行的SQL语句，十分方便。最近的项目使用MySQL，没有类似的功能，感觉到十分的不爽，网上也没有找到合适的免费工具，所以自己研究做了一个简单工具。

功能
  • 实时查询MySql执行的SQL语句
  • 查看性能异常的SQL（执行超过2秒）
技术方案
  • 前端vue，样式bootstrap
  • 后台dotnet core mvc

先看一下的效果：

实现原理

Mysql支持输出日志，通过以下命令查看当前状态

  • show VARIABLES like ‘%general_log%’ //是否开启输出所有日志

  • show VARIABLES like ‘%slow_query_log%’ //是否开启慢SQL日志
  • show VARIABLES like ‘%log_output%’ //查看日志输出方式（默认file，还支持table）

  • show VARIABLES like ‘%long_query_time%’ //查看多少秒定义为慢SQL

下面我们将所有日志、慢SQL日志打开，日志输出修改为table，定义执行2秒以上的为慢SQL
  • set global log_output=’table’ //日志输出到table（默认file）
  • set global general_log=on; //打开输出所有日志
  • set global slow_query_log=on; //打开慢SQL日志
  • set global long_query_time=2 //设置2秒以上为慢查询
  • repair table mysql.general_log //修复日志表（如果general_log表报错的情况下执行）

注意：以上的设置，数据库重启后将失效，永久改变配置需要修改my.conf文件

现在日志文件都存在数据库表里面了，剩下的工作就是取数并展示出来就行了。本项目后台使用的MVC取数，然后VUE动态绑定，Bootstrap渲染样式。
前端代码
<!DOCTYPE html>
<html lang="zh-CN">
<head>
    <meta charset="utf-8">
    <title>开发工具</title>
    <link rel="stylesheet" href="https://cdn.staticfile.org/twitter-bootstrap/3.3.7/css/bootstrap.min.css">
    <script src="https://cdn.staticfile.org/jquery/2.1.1/jquery.min.js"></script>
    <script src="https://cdn.staticfile.org/twitter-bootstrap/3.3.7/js/bootstrap.min.js"></script>
    <script src="https://cdn.staticfile.org/vue/2.2.2/vue.min.js"></script>
    <script src="https://cdn.staticfile.org/vue-resource/1.5.1/vue-resource.min.js"></script>
</head>
<body>
    <div id="app">

        <ul id="myTab" class="nav nav-tabs">
            <li class="active">
                <a href="#trace" data-toggle="tab">
                    SQL跟踪
                </a>
            </li>
            <li>
                <a href="#slow" data-toggle="tab">
                    性能异常SQL
                </a>
            </li>
        </ul>

        <hr />
        <div id="myTabContent" class="tab-content">
            <div id="trace" class="tab-pane fade in active">
                <div>
                    &nbsp;&nbsp;&nbsp;&nbsp;<input id="btnStart" class="btn btn-primary" type="button" value="开始" v-show="startShow" v-on:click="start" />
                    &nbsp;&nbsp;&nbsp;&nbsp;<input id="btnPause" class="btn btn-primary" type="button" value="暂停" v-show="pauseShow" v-on:click="pause" />
                    &nbsp;&nbsp;&nbsp;&nbsp;<input id="btnClear" class="btn btn-primary" type="button" value="清空" v-show="clearShow" v-on:click="clear" />
                </div>
                <hr />
                <div class="table-responsive">
                    <table class="table table-striped table-bordered">
                        <thead>
                            <tr>
                                <th>时间</th>
                                <th>执行语句</th>
                            </tr>
                        </thead>
                        <tbody>
                            <tr v-for="log in logs">
                                <td>
                                    {{log.time}}
                                </td>
                                <td>
                                    @*<input class="btn btn-danger" type="button" value="复制" name="copy" />*@
                                    {{log.sql}}
                                </td>
                            </tr>
                        </tbody>
                    </table>
                </div>
            </div>

            <div id="slow" class="tab-pane fade">
                <div class="table-responsive">
                    <table class="table table-striped table-bordered">
                        <thead>
                            <tr>
                                <th>执行时长(时：分：秒，毫秒)</th>
                                <th>锁定时长(时：分：秒，毫秒)</th>
                                <th>开始时间</th>
                                <th>数据库</th>
                                <th>操作者</th>
                                <th>执行语句</th>
                            </tr>
                        </thead>
                        <tbody>
                            <tr v-for="query in slowQuerys">
                                <td>
                                    {{query.queryTime}}
                                </td>
                                <td>
                                    @*<input class="btn btn-danger" type="button" value="复制" name="copy" />*@
                                    {{query.lockTime }}
                                </td>
                                <td>
                                    {{query.startTime }}
                                </td>
                                <td>
                                    {{query.db }}
                                </td>
                                <td>
                                    {{query.userHost}}
                                </td>
                                <td>
                                    {{query.sql}}
                                </td>
                            </tr>
                        </tbody>
                    </table>
                </div>
            </div>
        </div>
    </div>

        <script>

            new Vue({
                el: '#app',
                data: {
                    startShow: true,
                    pauseShow: false,
                    clearShow: true,
                    logs: [],
                    slowQuerys: []
                },
                methods: {
                    start: function () {
                        this.timer = setInterval(this.trace, 5000);
                        this.pauseShow = true;
                        this.startShow = false;
                    },
                    pause: function () {
                        clearInterval(this.timer);
                        this.pauseShow = false;
                        this.startShow = true;
                    },
                    clear: function () {
                        this.logs = null;
                    },
                    trace: function () {
                        //发送 post 请求
                        this.$http.post('/home/start', {}, { emulateJSON: true }).then(function (res) {
                            this.logs = res.body;
                        }, function (res) {
                            console.log(logs);
                        });
                    }
                },
                created: function () {

                },
                mounted: function () {
                    this.$http.post('/home/slow', {}, { emulateJSON: true }).then(function (res) {
                        this.slowQuerys = res.body;
                    }, function (res) {
                        console.log(this.slowQuerys);
                    });
                },
                destroyed: function () {
                    clearInterval(this.time)
                }
            });

        </script>
</body>
</html>
后端代码
using Ade.Tools.Models;
using Microsoft.AspNetCore.Mvc;
using Microsoft.Extensions.Configuration;
using System;
using System.Collections.Generic;
using System.IO;
using System.Linq;
using System.Text.RegularExpressions;
using MySql.Data.MySqlClient;
using Microsoft.Extensions.Caching.Memory;

namespace Ade.Tools.Controllers
{
    public class HomeController : Controller
    {
        public IConfiguration Configuration { get; set; }

        public HomeController(IConfiguration configuration)
        {
            this.Configuration = configuration;

            this.ConnStr = Configuration["Sql:DefaultConnection"];
        }

        public static DateTime StartTime { get; set; } = DateTime.MinValue;
        public static List<string> TableNames { get; set; }
        public string ConnStr { get; set; }

        public JsonResult Start()
        {
            if (StartTime == DateTime.MinValue)
            {
                StartTime = DateTime.Now;
            }

            int size = int.Parse(Configuration["Size"]);

            string[] blackList = Configuration["Blacklist"].Split(",");

            List<string> tableNames = GetTableNames();

            List<LogItem> logItems = new List<LogItem>();
            List<LogItemDTO> logItemDTOs = new List<LogItemDTO>();

            using (MySqlConnection mySqlConnection = new MySqlConnection(this.ConnStr))
            {
                //string sqlStart = "set global log_output='table';set global general_log=on; repair table mysql.general_log;";
                //Dapper.SqlMapper.Execute(mySqlConnection, sqlStart);

                logItemDTOs = Dapper.SqlMapper.Query<LogItemDTO>(mySqlConnection, $" select * from mysql.general_log " +
                     $"where event_time>'{StartTime.ToString("yyyy-MM-dd HH:mm:ss")}' " +
                     $"order by event_time desc ")
                     //+ $"limit {size} "
                     .ToList();
            }

            logItemDTOs.ForEach(e =>
            {
                LogItem logItem = new LogItem()
                {
                    Time = e.event_time.ToString("yyyy-MM-dd HH:mm:ss.fff"),
                    CommondType = e.command_type,
                    ServerId = e.server_id,
                    ThreadId = e.thread_id,
                    UserHost = e.user_host,
                    Sql = System.Text.Encoding.Default.GetString(e.argument)
                };

                if (tableNames.Any(a => logItem.Sql.Contains(a))
                && !blackList.Any(b => logItem.Sql.Contains(b))
                )
                {
                    logItems.Add(logItem);
                }
            });


            return new JsonResult(logItems);
        }

        public JsonResult Slow()
        {
            List<SlowQuery> slowQueries = new List<SlowQuery>();
            using (MySqlConnection mySqlConnection = new MySqlConnection(this.ConnStr))
            {
                string sql = "select * from mysql.slow_log order by query_time desc";
                List<SlowQueryDTO> slowDtos = Dapper.SqlMapper.Query<SlowQueryDTO>(mySqlConnection, sql).ToList();

                slowDtos.ForEach(e => {
                    slowQueries.Add(new SlowQuery()
                    {
                        DB = e.db,
                        LockTime = DateTime.Parse(e.lock_time.ToString()).ToString("HH:mm:ss.fffff"),
                        QueryTime = DateTime.Parse(e.query_time.ToString()).ToString("HH:mm:ss.fffff"),
                        RowsExamined = e.rows_examined,
                        RowsSent = e.rows_sent,
                        Sql = System.Text.Encoding.Default.GetString( (byte[])e.sql_text),
                        StartTime = e.start_time.ToString("yyyy-MM-dd HH:mm:ss"),
                        UserHost = e.user_host
                    });
                });

            }

            return new JsonResult(slowQueries);
        }

        public string On()
        {
            using (MySqlConnection mySqlConnection = new MySqlConnection(this.ConnStr))
            {
                string sql = "set global log_output='table';set global general_log=on; repair table mysql.general_log;";
                Dapper.SqlMapper.Execute(mySqlConnection, sql);
            }

            return "ok";
        }

        public string Off()
        {
            using (MySqlConnection mySqlConnection = new MySqlConnection(this.ConnStr))
            {
                string sql = "set global general_log=off;";
                Dapper.SqlMapper.Execute(mySqlConnection, sql);
            }

            return "ok";
        }

        public string Clear()
        {
            using (MySqlConnection mySqlConnection = new MySqlConnection(this.ConnStr))
            {
                string sql = $@"
                                SET GLOBAL general_log = 'OFF';
                                RENAME TABLE general_log TO general_log_temp;
                                DELETE FROM `general_log_temp`;
                                RENAME TABLE general_log_temp TO general_log;
                                SET GLOBAL general_log = 'ON';
                                ";

                Dapper.SqlMapper.Execute(mySqlConnection, sql);
            }

            return "ok";
        }

        public IActionResult Index()
        {
            return View();
        }

        private List<string> GetTableNames()
        {
            MemoryCache memoryCache = new MemoryCache(new MemoryCacheOptions());
            var cacheKey = "MySqlProfile_TableNames";

            List<string> tableNames = memoryCache.Get <List<string>>(cacheKey);

            if (tableNames != null)
            {
                return tableNames;
            }

            string[] traceDbs = Configuration["TraceDatabaseNames"].Split(",");
            string sqlTables = "SELECT distinct TABLE_NAME FROM information_schema.columns";

            foreach (var db in traceDbs)
            {
                if (!sqlTables.Contains("WHERE"))
                {
                    sqlTables += " WHERE table_schema='" + db + "'";
                }
                else
                {
                    sqlTables += " OR table_schema='" + db + "'";
                }
            }

            using (MySqlConnection mySqlConnection = new MySqlConnection(this.ConnStr))
            {
                //  WHERE table_schema='mice'
                tableNames = Dapper.SqlMapper.Query<string>(mySqlConnection, sqlTables).ToList();
            }

            memoryCache.Set(cacheKey, tableNames, TimeSpan.FromMinutes(30));

            return tableNames;
        }
    }
}

源代码

修改完appsettings.json文件里面的连接字符串以及其他配置(详情自己看注释，懒得写了)，就可以使用了。
https://github.com/holdengong/MysqlProfiler

最后一点

开启日志会产生大量的文件，需要注意定时清理

  • SET GLOBAL general_log = ‘OFF’; // 关闭日志
  • RENAME TABLE general_log TO general_log_temp; //表重命名
  • DELETE FROM general_log_temp; //删除所有数据
  • RENAME TABLE general_log_temp TO general_log; //重命名回来
  • SET GLOBAL general_log = ‘ON’; //开启日志

作者：holdengong

原文地址：https://www.cnblogs.com/holdengong/p/10115450.html

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