SQL排行榜问题nodejs discord.js

Question

我创建了一个简单的discord bot，其中包含消息监听器等，可以在某些事件中将数据添加到MySQL DB中。

我的代码为消息添加+1点对游戏进行评分（完全正常）：

//If message is sent add points to scores table

    con.query(`SELECT * FROM scores WHERE user="${message.author.id}" AND guild= "${message.guild.id}"`, (err, rows) => {
        if (err) throw err;

        let sql;
        if (rows.length < 1) {
            sql = `INSERT INTO scores (user, guild, points) VALUES ('${message.author.id}', '${message.guild.id}', '1')`, (err, rows) => {
                if (err) throw err;
            };

        } else {
            let score = rows[0].scores;
            sql = `UPDATE scores SET points = points +1 WHERE user="${message.author.id}" AND guild= "${message.guild.id}"`;
        };

        con.query(sql);

    });

一旦引导板命令进入通道;我想获取分数表中的数据，将其分配到前10并以不和谐的方式打印（通过使用message.channel.send或message.channel.send（embed）。

下面的代码是我到目前为止：

const Discord = require("discord.js");

module.exports.run = async (bot, message, args, con) => {
    
const top10 = `SELECT user, points, lstmsg FROM scores WHERE guild = '${message.guild.id}' ORDER BY cast(points as SIGNED) ASC LIMIT 10`;
//user, points, lstmsg from scores WHERE guild= '${message.guild.id}' ORDER BY points DESC LIMIT 10`;

con.query(top10, function(err, rows, fields) {
  if (err) throw err;

  //    const embed = new Discord.RichEmbed()
  //   .setTitle("Leaderboard")
  //   .setAuthor(bot.user.username,)
  //   .setDescription("Inactive..... Boooooo!")
  //   .addField(rows[1])
  //   .setColor(0x00AE86)


return message.channel.send(rows);

});


}
module.exports.help = {
    name: "top10",
    usage: "``prefix`` top10",
    description: "top 10 points",
}

但它在不和谐中发出以下内容：

[object Object]
[object Object]
[object Object]
[object Object]
[object Object]
[object Object]
[object Object]
[object Object]
[object Object]
[object Object]

有任何想法吗？提前致谢

使用JSON.Stringify返回如下结果：

[{"user":"123456789876587659","points":"2","lstmsg":"2019-03-04T22:40:40.000Z"},{"user":"378976806730203147","points":"80","lstmsg":"2019-03-05T10:10:18.000Z"},{"user":"123456789101112131","points":"93","lstmsg":"2019-03-04T22:40:29.000Z"},{"user":"378976806730203147","points":"168","lstmsg":"2019-03-05T10:10:18.000Z"},{"user":"456567676767867677","points":"289","lstmsg":"2019-03-04T22:41:01.000Z"}]

我希望数据显示为：

User:
Points:
Last Message: 

对于DB中的每个条目（限制为10）。

我还从资源中尝试了以下内容：SQLite-Based Points system

码：

const Discord = require("discord.js");

module.exports.run = async (bot, message, args, con) => {
  {
    var top10query = "SELECT * FROM scores WHERE guild = ? ORDER BY points DESC LIMIT 10"
    const top10 = con.query(top10query)

    // Now shake it and show it! (as a nice embed, too!)
    const embed = new Discord.RichEmbed()
      .setTitle("Leaderboard")
      .setAuthor(bot.user.username, bot.user.avatarURL)
      .setDescription("Our top 10 points leaders!")
      .setColor(0x00AE86);

    for (const data of top10) {
      embed.addField(bot.users.get(data.user).tag, `${data.points} points (last message ${data.lstmsg})`);
    }
    return message.channel.send({ embed });
  }





}
module.exports.help = {
  name: "inactive",
  usage: "``prefix`` inactive",
  description: "Bottom 30 inactive & last message date for current weeks",
}

但我收到一个错误（很可能是因为该示例适用于SQLite并适用于MySQL）：

（node：2880）UnhandledPromiseRejectionWarning：TypeError：top10不可迭代

Answer 1

我建议，如果还没有，user，guild是得分表的复合主键（或唯一键）。这可以在SQL中完成：

ALTER TABLE scores DROP PRIMARY KEY, ADD PRIMARY KEY (user, guide)

对于您的SQL语句，INSERT ON DUPLICATE KEY UPDATE是一个常见的查询。它依赖于上面的唯一或主键。

INSERT INTO scores (user, guild, points) VALUES ('${message.author.id}', '${message.guild.id}', '1')
ON DUPLICATE KEY UPDATE points=points+1

另见Preventing SQL injection in Node.js

Answer 2

尝试使用JSON.stringify();，文档是here为此。

var o = {
  a: 2, 
  b: 3
}
console.log(JSON.stringify(o));  //"{"a":2,"b":3}"

Answer 3

我使用map来绘制结果。

const Discord = require("discord.js");

module.exports.run = async (bot, message, args, con) => {

  const top10query = `SELECT user, points, lstmsg FROM scores WHERE guild = '${message.guild.id}' ORDER BY cast(points as SIGNED) DESC LIMIT 10`

  const query = querytxt => {
    return new Promise((resolve, reject) => {
      con.query(querytxt, (err, results, fields) => {
        if (err) reject(err);
        resolve([results, fields]);
      });
    });
  };
  const [results, fields] = await query(top10query);

  const map1 = results.map(results => ` ** User:** ${bot.users.get(results.user).username} \n **Messages:** ${results.points} \n **Last message:** ${results.lstmsg} \n`);
  message.channel.send(map1)
}
module.exports.help = {
  name: "top10",
  usage: "``prefix`` top10",
  description: "top 10 points",
}