如何显示正确的值？不和谐.js

如何解决如何显示正确的值？不和谐.js

我正在尝试使用 MysqL 制作货币系统。所以，我遇到的问题是当用户输入 ?add（添加货币）然后 ?bal（获取用户的余额）时一切正常，但如果用户输入 ?bal，机器人将显示前一个用户的余额：

预期输出

User1: ?add

Bot: Now you have 10 money!

User1: ?bal

Bot: You have 10 money!

User2: ?bal

Bot: You have 20 money!

实际输出

User1: ?add

Bot: Now you have 10 money!

User1: ?bal

Bot: You have 10 money!

User2: ?bal

Bot: You have 10 money! //which is User1's bal

奇怪的是，在数据库中的值很好（例如：User1 - 10; User2 - 20） 下面是代码

if(command == "add"){
      con.query(`SELECT * FROM money WHERE id = '${msg.author.id}'`,(err,rows) => {
        if (err) throw err;

       

        if(rows.length < 1){
       sql = `INSERT INTO money (id,money) VALUES ('${msg.author.id}','${add}')`
        }else{
         
          let money = rows[0].money;
          sql = `UPDATE money SET money = ${money + add} WHERE id = '${msg.author.id}' `
          msg.channel.send(`Now you have ${money} money!`)
        
        }
        con.query(sql,console.log)
        
      })
      
    }
      if(command == "bal"){
        con.query(`SELECT * FROM money WHERE id = '${msg.author.id}'`,(err) => {
          if (err) throw err;

          msg.channel.send(`You have ${money} money!`)

      })
      }

解决方法

您需要先结束连接，然后再开始另一个连接，否则它只会查询相同的内容。

if(command == "add") {
  con.start() // I am not sure of the syntax for starting a connection,but this is an assumption
  con.query(`SELECT * FROM money WHERE id = '${msg.author.id}'`,(err,rows) => {
    if (err) throw err;

    if(rows.length < 1) {
   sql = `INSERT INTO money (id,money) VALUES ('${msg.author.id}','${add}')`
    }else{
     
      let money = rows[0].money;
      sql = `UPDATE money SET money = ${money + add} WHERE id = '${msg.author.id}' `
      msg.channel.send(`Now you have ${money} money!`)
    
    }
    con.query(sql,console.log)
    con.end(); // these are important,because they close the connection
  })
}

if(command == "bal") {
    con.start() 
    con.query(`SELECT * FROM money WHERE id = '${msg.author.id}'`,(err) => {
      if (err) throw err;

      msg.channel.send(`You have ${money} money!`)
    con.end();
  })
}

我不确定用于启动查询的语法的性质，但我在网上发现使用了 <connection>.end()

我从未使用过 MySQL 并且我个人使用过 better-sqlite3，因为它快了 40 倍，但我认为这是您做错的地方。