Node.js、discord.js 和 MySQL - ER_NO_SUCH_TABLE：表 'NAME' 不存在

Question

2 天前刚开始编写一个不和谐的机器人，我现在被困在这里。 我得到的错误：ER_NO_SUCH_TABLE: Table 'mariobot.522488285910663201' doesn't exist

与此有关的部分代码：

con.query(`SELECT * FROM ??`, [targetUserId], (err, result, fields) => {
  if (err) {
    con.query(
      `CREATE TABLE IF NOT EXISTS ?? (userName varchar(255),positiveVouches int(10),negativeVouches int(10),totalVouches int(10),createdAt timestamp)`,
      [targetUserId],
      function (err, result) {
        if (err) throw err;
        console.log(`Table for ${userName} successfully created.`);
      }
    );

    message.react("✅");
    message.reply(`you successfully registered.`);

    var sql = mysql.format(
      "INSERT INTO ?? SET ? = ?, positiveVouches = 0,negativeVouches = 0,totalVouches = 0,createdAt = ?",
      [targetUserId, "userName", userName, dformat]
    );
    con.query(sql, function (error, results, fields) {
      console.log(sql);
      if (err) {
        throw err;
      }
    });
    console.log(`Row for ${userName} successfully added.`);
  } else {
    console.log(
      `${userName} tried to register again but a table already` + ` exists`.red
    );
    message.react("❎");
    message.reply(`you are already registered.`);
  }
});

该表存在于数据库中，所以我不知道它的真正原因。 DATABASE TABLE IMAGE LINK

Answer 1

问题在于，在运行 CREATE TABLE 语句时，以下代码并未在其回调中完成。这意味着当语句运行时，它后面的代码（message.react() 等）在CREATE TABLE 语句完成之前运行。后来的con.query也存在同样的问题。

要解决此问题，请将您的代码移动到运行CREATE TABLE 完成的回调中：

con.query(`SELECT * FROM ??`, [targetUserId], (err, result, fields) => {
  if (err) {
    con.query(
      `CREATE TABLE IF NOT EXISTS ?? (userName varchar(255),positiveVouches int(10),negativeVouches int(10),totalVouches int(10),createdAt timestamp)`,
      [targetUserId],
      function (err, result) {
        if (err) throw err;
        console.log(`Table for ${userName} successfully created.`);

        message.react("✅");
        message.reply(`you successfully registered.`);

        var sql = mysql.format(
          "INSERT INTO ?? SET ? = ?, positiveVouches = 0,negativeVouches = 0,totalVouches = 0,createdAt = ?",
          [targetUserId, "userName", userName, dformat]
        );
        con.query(sql, function (error, results, fields) {
          console.log(sql);
          if (err) {
            throw err;
          }

          console.log(`Row for ${userName} successfully added.`);
        });
      }
    );
  } else {
    console.log(
      `${userName} tried to register again but a table already` + ` exists`.red
    );
    message.react("❎");
    message.reply(`you are already registered.`);
  }
});