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
开发工具
时间
执行语句
{{log.time}}
@**@
{{log.sql}}
执行时长(时：分：秒，毫秒)
锁定时长(时：分：秒，毫秒)
开始时间
数据库
操作者
执行语句
{{query.queryTime}}
@**@
{{query.lockTime }}
{{query.startTime }}
{{query.db }}
{{query.userHost}}
{{query.sql}}
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 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 tableNames = GetTableNames();
List logItems = new List();
List logItemDTOs = new List();
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(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 slowQueries = new List();
using (MySqlConnection mySqlConnection = new MySqlConnection(this.ConnStr))
{
string sql = "select * from mysql.slow_log order by query_time desc";
List slowDtos = Dapper.SqlMapper.Query(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 GetTableNames()
{
MemoryCache memoryCache = new MemoryCache(new MemoryCacheOptions());
var cacheKey = "MySqlProfile_TableNames";
List tableNames = memoryCache.Get >(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(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