SQL 排行榜问题 nodejs discord.js

Question

我创建了一个简单的不和谐机器人，其中包含消息侦听器等，它在某些事件上将数据添加到 MySQL 数据库中。

我的代码为在频道中添加 +1 点评分（完全有效）：

//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);

    });

一旦排行榜命令进入频道；我想获取分数表中的数据，将其分类到前 10 名并以不和谐的方式打印（通过使用 message.channel.send 或 message.channel.send(embed)。

以下代码是我目前所拥有的：

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",
}

但它发送的内容不一致：

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

有什么想法吗？提前致谢

使用 JSON.Stringify 会返回如下结果：

[{"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: 

对于数据库中的每个条目（限制为 10 个）。

我还尝试了以下资源：SQLite-Based Points system

代码：

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",
}

但我得到一个错误（很可能是因为该示例适用于 SQLlite 并适用于 MySQL）：

(node:2880) UnhandledPromiseRejectionWarning: TypeError: top10 is not iterable

Answer 1

如果还没有的话，我建议user、guild 是分数表的复合主键（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键或主键。

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();，文档为here。

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

Answer 3

我用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",
}