獲得在MySQL查詢的OUTFILE日起節點js代碼

Question

我試圖實現SQL編寫OUTFILE包括時間戳：

sql query:SET @TS = DATE_FORMAT(NOW(),'_%Y_%m_%d_%H_%i_%s'); 
SET @FOLDER = 'now'; 
SET @EXT = '.csv'; 
SET @CMD = CONCAT("SELECT * FROM test.extract INTO  OUTFILE'",@FOLDER,@TS,@EXT,"' FIELDS TERMINATED BY ',' LINES TERMINATED BY  '\n';"); 
PREPARE statement FROM @CMD; 
EXECUTE statement; 

如果我給在節點js腳本給出了相同的查詢低於它是失敗的。有人可以幫忙。

var mysql  = require('mysql'); 
var connection = mysql.createConnection({ 
host  : 'localhost', 
user  : 'root', 
password : 'root', 
database : 'test' 
}); 

connection.connect(); 

var timeInMs = Date.now(); 
console.log(timeInMs); 


connection.query("SET @TS = DATE_FORMAT(NOW(),'_%Y_%m_%d_%H_%i_%s'); 
SET @FOLDER = 'now'; 
SET @EXT = '.csv'; 
SET @CMD = CONCAT(
"SELECT * FROM test.extract INTO OUTFILE'",@FOLDER,@TS,@EXT,"' FIELDS  TERMINATED BY ',' LINES TERMINATED BY '\n';"); 

PREPARE statement FROM @CMD; 
EXECUTE statement;",function(err, rows, fields) { 
if (!err) 
    console.log('The solution is: ', rows); 
else 
    console.log('Error while performing Query.'); 
}); 
connection.end(); 

Answer 1

按照mysql模塊的NodeJS的documentation：

支持多個語句是出於安全原因禁用（它 允許SQL注入攻擊，如果值不正確地轉義）。 要使用此功能，您必須啓用它爲您的連接：

var connection = mysql.createConnection({multipleStatements: true}); 

另外，對於多線才能正常工作，把它放在反引號。以下代碼適用於我：

var mysql  = require('mysql'); 
var connection = mysql.createConnection({ 
host  : 'localhost', 
user  : 'root', 
password : 'root', 
database : 'test', 
multipleStatements: true 
}); 

connection.connect(); 

var timeInMs = Date.now(); 
console.log(timeInMs); 

connection.query(`SET @TS = DATE_FORMAT(NOW(),'_%Y_%m_%d_%H_%i_%s'); 
SET @FOLDER = 'now'; 
SET @EXT = '.csv'; 
SET @CMD = CONCAT(
"SELECT * FROM mysql.user INTO OUTFILE'",@FOLDER,@TS,@EXT,"' FIELDS  TERMINATED BY ',' LINES TERMINATED BY '\n';"); 
PREPARE statement FROM @CMD; 
EXECUTE statement;`  
,function(err, rows, fields) { 
if (!err) 
    console.log('The solution is: ', rows); 
else 
    console.log('Error while performing Query.', err); 
}); 
connection.end();