Question

我有这个功能，我需要返回true或false。问题是，它似乎没有正确行为。如果它确实返回false，它不会断开客户端，如果它确实返回true，它仍然会“console.log（'断开客户端......'）”我完全丢失了。 :(这是针对node.js mysql和socket.io

CODE：

if(!client_to_server_00(header,data,len)){
    // should send the server a packet to terminate the connection on
               their end...
    // It should send 0x00 SERVER->CLIENT (will implement later)
    console.log('Disconnecting client...'); // This always shows no matter what
    client.emit('disconnect');  // **This does not work!
}else{
    console.log('ID VERIFIED!  WELCOME!');
 }

=============================================== ===================================

// LOGIN INFORMATION
function client_to_server_00(header, data, len){
// We are already connected to the database
var z = decodeFromHex(data);    // find the username
z = returnvalue(z,1,len);       // the code was a little off (ill fix it later)
console.log(z);                 // make sure we have this correct

// In this example.  The database returns 'oh'  And z = 'oh'

client.query('USE '+TEST_DATABASE);

client.query(
 'SELECT * FROM '+TEST_TABLE,
function selectCb(err, results, fields) {
if (err) {
  throw err;
}
var first = results[0];
console.log('USRNAME: ['+first['name']+']');  // Make sure we have it

if(first['name'] == z){
console.log('Correct');
return true;                    // I need client_to_server_00 function to return true if correct
}else{
console.log('Incorrect');
return false;                   // I need client_to_server_00 function to return false if incorrect
}

})
};

Answer 1

这是一个很常见的错误。您缺少非常基本的异步编程概念 - 您必须将回调传递给client_to_server_00函数，并在完成异步填充（本例中为数据库连接）时调用它。

JS node-mysql bools表现得很奇怪

1 个答案: