javascript - 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，配有消息监听器等，它可以在某些事件上将数据添加到 MySQL 数据库中。

我的代码，用于在进入 channel 的消息上添加 +1 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);

    });

一旦排行榜命令被输入到 channel 中；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它(通过使用 message.channel.send 或 message.channel.send(embed))。

下面的代码是我到目前为止所拥有的:

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",
}

但它发送了以下不一致的内容:

[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 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(仅限 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",
}

但我收到一个错误(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

我建议(如果还没有的话)将user、guild作为分数表的复合主键(或唯一键)。这可以在 SQL 中通过以下方式完成:

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

对于您的 SQL 语句 INSERT ON DUPLICATE KEY UPDATE是对此的常见查询。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

另请参阅Preventing SQL injection in Node.js