How to insert an object into SQL using nodejs - mysql

I'm trying to insert some string variables into a DB with nodeJS following parsing the text from the DOM.
I'm using cheerio for that , here's an example that I'm trying to write to my db, it type tests as a string and outputs a score out of 10 e.g 3.5 out of 10.
var kf = $('span.glyphicons.glyphicons-star').attr('title')
My code for the sql is as follows, I can't seem to find anywhere how to define the variable in the sql query line:
con.connect(function(err) {
if (err) throw err;
console.log("Connected!");
var sql = "INSERT INTO juice (ratescore) VALUES ('" + con.escape(kf) + "')";
con.query(sql, function (err, result) {
if (err) throw err;
console.log("1 record inserted");
});
});

Related

errno: 1064, sqlState: '42000', sqlMessage: "You have an error in your SQL syntax; [duplicate]

I'm using nodejs 10.26 + express 3.5 + node-mysql 2.1.1 +
MySQL-Server Version: 5.6.16.
I got 4 DELETE's and want only 1 Database Request, so i connected the DELETE commands with a ";"... but it fails always.
var sql_string = "DELETE FROM user_tables WHERE name = 'Testbase';";
sql_string += "DELETE FROM user_tables_structure WHERE parent_table_name = 'Testbase';";
sql_string += "DELETE FROM user_tables_rules WHERE parent_table_name = 'Testbase';";
sql_string += "DELETE FROM user_tables_columns WHERE parent_table_name = 'Testbase';";
connection.query(sql_string, function(err, rows, fields) {
if (err) throw err;
res.send('true');
});
It throws this error:
Error: ER_PARSE_ERROR: You have an error in your SQL syntax; check the manual that corresponds to your MySQL server version for the right syntax to use near 'DELETE FROM user_tables_structure WHERE parent_table_name = 'Testbase';DELETE FR' at line 1
But if i paste this SQL in PhpMyAdmin it is always successful...
If i write it in single query's its succeed, too.
connection.query("DELETE FROM user_tables WHERE name = 'Testbase'", function(err, rows, fields) {
if (err) throw err;
connection.query("DELETE FROM user_tables_structure WHERE parent_table_name = 'Testbase'", function(err, rows, fields) {
if (err) throw err;
connection.query("DELETE FROM user_tables_rules WHERE parent_table_name = 'Testbase'", function(err, rows, fields) {
if (err) throw err;
connection.query("DELETE FROM user_tables_columns WHERE parent_table_name = 'Testbase'", function(err, rows, fields) {
if (err) throw err;
res.send('true');
});
});
});
});
Thanks for help!

I guess you are using node-mysql. (but should also work for node-mysql2)
The docs says:
Support for multiple statements is disabled for security reasons (it
allows for SQL injection attacks if values are not properly escaped).
Multiple statement queries
To use this feature you have to enable it for your connection:
var connection = mysql.createConnection({multipleStatements: true});
Once enabled, you can execute queries with multiple statements by separating each statement with a semi-colon ;. Result will be an array for each statement.
Example
connection.query('SELECT ?; SELECT ?', [1, 2], function(err, results) {
if (err) throw err;
// `results` is an array with one element for every statement in the query:
console.log(results[0]); // [{1: 1}]
console.log(results[1]); // [{2: 2}]
});
So if you have enabled the multipleStatements, your first code should work.

Using "multiplestatements: true" like shown below worked for me
var connection = mysql.createConnection({
host: 'localhost',
user: 'root',
password: '',
database: '',
multipleStatements: true
});
connection.connect();
var sql = "CREATE TABLE test(id INT DEFAULT 1, name VARCHAR(50));ALTER TABLE test ADD age VARCHAR(10);";
connection.query(sql, function(error, results, fields) {
if (error) {
throw error;
}
});

To Fetch Data from DB(SQL), the following function would work accurately
router.get('/', function messageFunction(req, res){
//res.send('Hi Dear Rasikh, Welcome to Test Page.') //=> One Way
dbConn.query('SELECT COUNT(name) as counted, name, last_name, phone, email from students',
function (err, rows, fields) { // another Way
if (err) throw err
dbConn.query('SELECT name, author from books',
function (err, rowsBook, fields) { // another Way
if (err) throw err
// console.log('The counted is: ', rows[0].counted); //=> Display in console
// res.send('Hi Dear Rasikh, Welcome to Test Page.'+ rows[0].counted) //=> Display in blank page
res.render('main/index',{data:rows, myData:rowsBook});
})
});
});

Keep getting an error when trying to get the output from MySQL using Node JS [duplicate]

I'm using nodejs 10.26 + express 3.5 + node-mysql 2.1.1 +
MySQL-Server Version: 5.6.16.
I got 4 DELETE's and want only 1 Database Request, so i connected the DELETE commands with a ";"... but it fails always.
var sql_string = "DELETE FROM user_tables WHERE name = 'Testbase';";
sql_string += "DELETE FROM user_tables_structure WHERE parent_table_name = 'Testbase';";
sql_string += "DELETE FROM user_tables_rules WHERE parent_table_name = 'Testbase';";
sql_string += "DELETE FROM user_tables_columns WHERE parent_table_name = 'Testbase';";
connection.query(sql_string, function(err, rows, fields) {
if (err) throw err;
res.send('true');
});
It throws this error:
Error: ER_PARSE_ERROR: You have an error in your SQL syntax; check the manual that corresponds to your MySQL server version for the right syntax to use near 'DELETE FROM user_tables_structure WHERE parent_table_name = 'Testbase';DELETE FR' at line 1
But if i paste this SQL in PhpMyAdmin it is always successful...
If i write it in single query's its succeed, too.
connection.query("DELETE FROM user_tables WHERE name = 'Testbase'", function(err, rows, fields) {
if (err) throw err;
connection.query("DELETE FROM user_tables_structure WHERE parent_table_name = 'Testbase'", function(err, rows, fields) {
if (err) throw err;
connection.query("DELETE FROM user_tables_rules WHERE parent_table_name = 'Testbase'", function(err, rows, fields) {
if (err) throw err;
connection.query("DELETE FROM user_tables_columns WHERE parent_table_name = 'Testbase'", function(err, rows, fields) {
if (err) throw err;
res.send('true');
});
});
});
});
Thanks for help!

I guess you are using node-mysql. (but should also work for node-mysql2)
The docs says:
Support for multiple statements is disabled for security reasons (it
allows for SQL injection attacks if values are not properly escaped).
Multiple statement queries
To use this feature you have to enable it for your connection:
var connection = mysql.createConnection({multipleStatements: true});
Once enabled, you can execute queries with multiple statements by separating each statement with a semi-colon ;. Result will be an array for each statement.
Example
connection.query('SELECT ?; SELECT ?', [1, 2], function(err, results) {
if (err) throw err;
// `results` is an array with one element for every statement in the query:
console.log(results[0]); // [{1: 1}]
console.log(results[1]); // [{2: 2}]
});
So if you have enabled the multipleStatements, your first code should work.

Using "multiplestatements: true" like shown below worked for me
var connection = mysql.createConnection({
host: 'localhost',
user: 'root',
password: '',
database: '',
multipleStatements: true
});
connection.connect();
var sql = "CREATE TABLE test(id INT DEFAULT 1, name VARCHAR(50));ALTER TABLE test ADD age VARCHAR(10);";
connection.query(sql, function(error, results, fields) {
if (error) {
throw error;
}
});

To Fetch Data from DB(SQL), the following function would work accurately
router.get('/', function messageFunction(req, res){
//res.send('Hi Dear Rasikh, Welcome to Test Page.') //=> One Way
dbConn.query('SELECT COUNT(name) as counted, name, last_name, phone, email from students',
function (err, rows, fields) { // another Way
if (err) throw err
dbConn.query('SELECT name, author from books',
function (err, rowsBook, fields) { // another Way
if (err) throw err
// console.log('The counted is: ', rows[0].counted); //=> Display in console
// res.send('Hi Dear Rasikh, Welcome to Test Page.'+ rows[0].counted) //=> Display in blank page
res.render('main/index',{data:rows, myData:rowsBook});
})
});
});

Why do strings end up as unreadable in MYSQL database?

Im using Node JS to create random ethereum accounts and I would like to store them in the mysql database (yeah I know it's bad but that's not the point).
Insertion goes without errors, but when I look at the inserted data it looks unrecognizeable.
I've tried changing collation into various encodings but nothing helped. Also, this: res.setHeader('Content-Type', 'application/json; charset=utf-8');
CODE:
const newAcc = web3.eth.accounts.create();
con.connect(function(err) {
if (err || !newAcc) throw err;
console.log("Connected!");
var sql = 'INSERT INTO eth_accounts (addressEth, privateKeyEth) VALUES
('+newAcc.address+', '+newAcc.privateKey+')';
con.query(sql, function (err, result, fields) {
if (err) throw err;
console.log(result);
});
var sql = 'SELECT * FROM eth_accounts';
con.query(sql, function (err, result, fields) {
if (err) throw err;
console.log(result);
});
});
I've been using PHP so far and every time a string would look strange I would just slap use utf 8 command on top and it would work.
This is the error message that I'm getting:
????J????m~?G?ȓ?L^ as address, ?]??n?A*j?[|??-hޏ?gx?_>?{?-?| as
key...

Per comment discussion above, the solution was to use quotes around the strings:
var sql = "INSERT INTO eth_accounts (addressEth, privateKeyEth) VALUES ('"
+ newAcc.address + "', '" + newAcc.privateKey + "')";

MYSQL syntax error while running query in nodejs . Works fine on mysql workbench [duplicate]

I'm using nodejs 10.26 + express 3.5 + node-mysql 2.1.1 +
MySQL-Server Version: 5.6.16.
I got 4 DELETE's and want only 1 Database Request, so i connected the DELETE commands with a ";"... but it fails always.
var sql_string = "DELETE FROM user_tables WHERE name = 'Testbase';";
sql_string += "DELETE FROM user_tables_structure WHERE parent_table_name = 'Testbase';";
sql_string += "DELETE FROM user_tables_rules WHERE parent_table_name = 'Testbase';";
sql_string += "DELETE FROM user_tables_columns WHERE parent_table_name = 'Testbase';";
connection.query(sql_string, function(err, rows, fields) {
if (err) throw err;
res.send('true');
});
It throws this error:
Error: ER_PARSE_ERROR: You have an error in your SQL syntax; check the manual that corresponds to your MySQL server version for the right syntax to use near 'DELETE FROM user_tables_structure WHERE parent_table_name = 'Testbase';DELETE FR' at line 1
But if i paste this SQL in PhpMyAdmin it is always successful...
If i write it in single query's its succeed, too.
connection.query("DELETE FROM user_tables WHERE name = 'Testbase'", function(err, rows, fields) {
if (err) throw err;
connection.query("DELETE FROM user_tables_structure WHERE parent_table_name = 'Testbase'", function(err, rows, fields) {
if (err) throw err;
connection.query("DELETE FROM user_tables_rules WHERE parent_table_name = 'Testbase'", function(err, rows, fields) {
if (err) throw err;
connection.query("DELETE FROM user_tables_columns WHERE parent_table_name = 'Testbase'", function(err, rows, fields) {
if (err) throw err;
res.send('true');
});
});
});
});
Thanks for help!

I guess you are using node-mysql. (but should also work for node-mysql2)
The docs says:
Support for multiple statements is disabled for security reasons (it
allows for SQL injection attacks if values are not properly escaped).
Multiple statement queries
To use this feature you have to enable it for your connection:
var connection = mysql.createConnection({multipleStatements: true});
Once enabled, you can execute queries with multiple statements by separating each statement with a semi-colon ;. Result will be an array for each statement.
Example
connection.query('SELECT ?; SELECT ?', [1, 2], function(err, results) {
if (err) throw err;
// `results` is an array with one element for every statement in the query:
console.log(results[0]); // [{1: 1}]
console.log(results[1]); // [{2: 2}]
});
So if you have enabled the multipleStatements, your first code should work.

Using "multiplestatements: true" like shown below worked for me
var connection = mysql.createConnection({
host: 'localhost',
user: 'root',
password: '',
database: '',
multipleStatements: true
});
connection.connect();
var sql = "CREATE TABLE test(id INT DEFAULT 1, name VARCHAR(50));ALTER TABLE test ADD age VARCHAR(10);";
connection.query(sql, function(error, results, fields) {
if (error) {
throw error;
}
});

To Fetch Data from DB(SQL), the following function would work accurately
router.get('/', function messageFunction(req, res){
//res.send('Hi Dear Rasikh, Welcome to Test Page.') //=> One Way
dbConn.query('SELECT COUNT(name) as counted, name, last_name, phone, email from students',
function (err, rows, fields) { // another Way
if (err) throw err
dbConn.query('SELECT name, author from books',
function (err, rowsBook, fields) { // another Way
if (err) throw err
// console.log('The counted is: ', rows[0].counted); //=> Display in console
// res.send('Hi Dear Rasikh, Welcome to Test Page.'+ rows[0].counted) //=> Display in blank page
res.render('main/index',{data:rows, myData:rowsBook});
})
});
});

I want to add a variable into mysql in nodejs

I insert a record in the database like this
connection.connect(function(err) {
if (err) throw err;
console.log("Connected!");
var sql = "INSERT INTO xtable (x_date, x_time, x_text) VALUES ('2018-05-26', '23:00:00', 'blablabla')";
connection.query(sql, function (err, result) {
if (err) throw err;
console.log("1 record inserted");
connection.end();
});
});
The above works but lets say I do
var ytime = '19:00:00';
var ydate = '2018-05-29';
var ytext = 'blabla';
connection.connect(function(err) {
if (err) throw err;
console.log("Connected!");
var sql = "INSERT INTO xtable (x_date, x_time, x_text) VALUES (ydate, ytime, ytext)";
connection.query(sql, function (err, result) {
if (err) throw err;
console.log("1 record inserted");
connection.end();
});
});
How do I do that? this gives just errors my node is v8.10.0

The latter didn't work because the sql statement did not interpret your ydate,ytime,ytext as variables but as a part of string. If you want to separate the statement and your data, you should do like this:
var ytime = '19:00:00';
var ydate = '2018-05-29';
var ytext = 'blabla';
var sql = "INSERT INTO xtable (x_date, x_time, x_text) VALUES (?,?,?)";
connection.query(sql, [ydate,ytime, ytext], function(err,result) {
...
});

You just switch your data to use placeholder values, then add the data separately:
connection.query(
"INSERT INTO xtable (x_date, x_time, x_text) VALUES (?, ?, ?)",
[ ydate, ytime, ytext ],
function (err, result) {
// ...
}
}
One thing to note about Node and MySQL is there's tools like Sequelize that make this a lot easier. Anything that supports Promises and async/await is almost always less fuss than a series of nested callbacks.