I'm trying to get a row from the database but when using binding. I know that this doesn't work because the query automatically puts single quotes so it will be like this: select model, magazine, round('name', 2) etc. This doesn't work of course but how do I get rid of the single quotes?
$merkinformation = DB::select('select Model, Magazine, round(?, 2) as Rondetijd from rondetijden where Merk = ? order by ? limit 3;', [$track, $merk, $track]);
You can't use column nmaes like this.
You must concatinate the name of the column. But this is vulnerable to sql injection. So you must check if $track has a valid content
$merkinformation = DB::select('select Model, Magazine, round(`' . $track . '` , 2) as Rondetijd from rondetijden where Merk = ? order by ? limit 3;', [$merk, $track]);
there is ['] single quote and [`] punctuation mark. If start with single quote or double quote mysql will translate that as string where punctuation mark will be recognize as field name.
Are you sure that is a single quote ?
I am trying to send city from a page to another and then show items from database where city is the mentioned city but this code does not return any results. Please guide. I am sure everything else is fine with the code.
$city = $_POST["city"];
$sql = "SELECT id,full_name, email, password,full_address,city,age,contact_number,gender,education FROM users WHERE city=$city";
// strip tags from the input
$city = strip_tags($_POST["city"]);
// escape the input to prevent sql injection (assuming you are using mysqli() as your connection method...)
$city = mysqli_real_escape_string($city);
// your query does not work because you need to put strings inside single quotes
$sql = "SELECT id,full_name, email, password,full_address,city,age,contact_number,gender,education FROM users WHERE city='$city'";
Actually, you're not even executing the request on your mysql server, but if you are using PDO (what you SHOULD do), just do something like this:
<?php
$bdd = new PDO(etc);
$req = $bdd->prepare("SELECT id,full_name, email, password,full_address,city,age,contact_number,gender,education FROM users WHERE city=?");
$req->execute(array($_POST['city']));
print_r($req->fetchAll());
?>
And here you go, $req->fetchAll() will return you an array with each element returned by your request, and the best part is that prepare will prevent you from every SQLi
Edit: You can use short syntax for array [$_POST['city']] or old and complete syntax: array($_POST['city'])
Got a question for you all...
What would be the best way to search my table by array, that has an array in the table.
EG:
$var = (1,4,7,9,14)
$Query = "SELECT * FROM business_listings WHERE category IN ($var)";
'category' would have 4,27,89,101
How can I get this to match if one of the numbers in the $var matches one of the numbers in the table.
If your database column is a list of comma separated values, and you're searching for one value in that list, then you're in a different situation.
If your category column contains the text value 410,406,149,152, like you commented below, and you're searching for fields whose category contains 152, then you'll need to use MySQL's FIND_IN_SET() function.
If you have to check multiple values, then you need to use more than one FIND_IN_SET. If you read the documentation, you'll see that the first argument for FIND_IN_SET must be a single string, not a string list (it can't contain a comma). Use the following instead:
$var = "401,320,152";
$items = explode(",", $var);
foreach ($items as &$i) {
$i = "FIND_IN_SET('" . $i . "', `category`)";
}
$search = implode(" OR ", $items);
unset($i);
$query = "SELECT * FROM business_listings WHERE " . $items;
This will output:
SELECT * FROM business_listings WHERE
FIND_IN_SET('401', `category`) OR
FIND_IN_SET('320', `category`) OR
FIND_IN_SET('152', `category`)
The above script will work even if $var contains only one value.
Finally, as tadman mentioned, since we're getting into queries that can be tricky to build with prepared statements, you need to make sure you're escaping and sanitizing your input properly. For an example, if $var is being retrieved from the user somehow, then before you modify it in any way, you need to escape it with mysqli_real_escape_string():
$var = $mysqli->real_escape_string($var);
Assuming that $mysqli is your open MySQLi connection.
Hope this helps!
I am trying to query some tables in my database using a simple dropdown in which the name of the tables are listed. the query has only one record result showing the name and age of the youngest institute registered in the database!
$table = $_GET['table'];
$query = "select max('$table'.est_year) as 'establish_year' from '$table' ";
I need to send the name of the table as variable to the querier php file. no matter the method is GET or POST in both ways when I put the variable name in the query statement, it gives the error:
"You have an error in your SQL syntax; check the manual that corresponds to your MySQL server version for the right syntax to use near '.order) as 'last' from 'customers'' "
You are wrapping the table name in single quotes, which is not valid SQL (that's the syntax for strings, not table names). You should either not wrap the name at all or else wrap it in backticks (on the american keyboard layout, that's the key above TAB).
You should also not quote the alias established_year:
select max(`$table`.est_year) as establish_year from `$table`
Also, your code is vulnerable to SQL injection. Fix this immediately!
Update (sql injection defense):
In this case the most appropriate action would likely be to validate the table name against a whitelist:
if (!in_array($table, array('allowed_table_1', '...'))) {
die("Invalid table name");
}
single quote ('), in mysql, it represents string value.
SELECT *, 'table' FROM `table`;
Demo
So your query should be
$table = $_GET['table'];
$query = "select max($table.est_year) as 'establish_year' from $table ";
Also read old post, phpmyadmin sql apostrophe not working.
Also your code is vulnerable to SQL Injection. You can use something like this
//Function to sanitize values received from the form. Prevents SQL injection
function clean($str) {
$str = #trim($str);
if(get_magic_quotes_gpc()) {
$str = stripslashes($str);
}
return mysql_real_escape_string($str);
}
$firstName = clean($_POST['firstName']);
$lastName = clean($_POST['lastName']);
.
.
.
How do I insert a value in MySQL that consist of single or double quotes. i.e
This is Ashok's Pen.
The single quote will create problems. There might be other escape characters.
How do you insert the data properly?
Put quite simply:
SELECT 'This is Ashok''s Pen.';
So inside the string, replace each single quote with two of them.
Or:
SELECT 'This is Ashok\'s Pen.'
Escape it =)
' is the escape character. So your string should be:
This is Ashok''s Pen
If you are using some front-end code, you need to do a string replace before sending the data to the stored procedure.
For example, in C# you can do
value = value.Replace("'", "''");
and then pass value to the stored procedure.
See my answer to "How to escape characters in MySQL"
Whatever library you are using to talk to MySQL will have an escaping function built in, e.g. in PHP you could use mysqli_real_escape_string or PDO::quote
Use this code:
<?php
$var = "This is Ashok's Pen.";
mysql_real_escape_string($var);
?>
This will solve your problem, because the database can't detect the special characters of a string.
If you use prepared statements, the driver will handle any escaping. For example (Java):
Connection conn = DriverManager.getConnection(driverUrl);
conn.setAutoCommit(false);
PreparedStatement prepped = conn.prepareStatement("INSERT INTO tbl(fileinfo) VALUES(?)");
String line = null;
while ((line = br.readLine()) != null) {
prepped.setString(1, line);
prepped.executeQuery();
}
conn.commit();
conn.close();
There is another way to do this which may or may not be safer, depending upon your perspective. It requires MySQL 5.6 or later because of the use of a specific string function: FROM_BASE64.
Let's say you have this message you'd like to insert:
"Ah," Nearly Headless Nick waved an elegant hand, "a matter of no importance. . . . It's not as though I really wanted to join. . . . Thought I'd apply, but apparently I 'don't fulfill requirements' -"
That quote has a bunch of single- and double-quotes and would be a real pain to insert into MySQL. If you are inserting that from a program, it's easy to escape the quotes, etc. But, if you have to put that into a SQL script, you'll have to edit the text (to escape the quotes) which could be error prone or sensitive to word-wrapping, etc.
Instead, you can Base64-encode the text, so you have a "clean" string:
SWtGb0xDSWdUbVZoY214NUlFaGxZV1JzWlhOeklFNXBZMnNnZD
JGMlpXUWdZVzRnWld4bFoyRnVkQ0JvWVc1a0xDQWlZU0J0WVhS
MFpYCklnYjJZZ2JtOGdhVzF3YjNKMFlXNWpaUzRnTGlBdUlDNG
dTWFFuY3lCdWIzUWdZWE1nZEdodmRXZG9JRWtnY21WaGJHeDVJ
SGRoYm5SbApaQ0IwYnlCcWIybHVMaUF1SUM0Z0xpQlVhRzkxWj
JoMElFa25aQ0JoY0hCc2VTd2dZblYwSUdGd2NHRnlaVzUwYkhr
Z1NTQW5aRzl1SjMKUWdablZzWm1sc2JDQnlaWEYxYVhKbGJXVn
VkSE1uSUMwaUlBPT0K
Some notes about Base64-encoding:
Base64-encoding is a binary encoding, so you'd better make sure that you get your character set correct when you do the encoding, because MySQL is going to decode the Base64-encoded string into bytes and then interpret those. Be sure base64 and MySQL agree on what the character encoding is (I recommend UTF-8).
I've wrapped the string to 50 columns for readability on Stack Overflow. You can wrap it to any number of columns you want (or not wrap at all) and it will still work.
Now, to load this into MySQL:
INSERT INTO my_table (text) VALUES (FROM_BASE64('
SWtGb0xDSWdUbVZoY214NUlFaGxZV1JzWlhOeklFNXBZMnNnZD
JGMlpXUWdZVzRnWld4bFoyRnVkQ0JvWVc1a0xDQWlZU0J0WVhS
MFpYCklnYjJZZ2JtOGdhVzF3YjNKMFlXNWpaUzRnTGlBdUlDNG
dTWFFuY3lCdWIzUWdZWE1nZEdodmRXZG9JRWtnY21WaGJHeDVJ
SGRoYm5SbApaQ0IwYnlCcWIybHVMaUF1SUM0Z0xpQlVhRzkxWj
JoMElFa25aQ0JoY0hCc2VTd2dZblYwSUdGd2NHRnlaVzUwYkhr
Z1NTQW5aRzl1SjMKUWdablZzWm1sc2JDQnlaWEYxYVhKbGJXVn
VkSE1uSUMwaUlBPT0K
'));
This will insert without any complaints, and you didn't have to manually-escape any text inside the string.
You should escape the special characters using the \ character.
This is Ashok's Pen.
Becomes:
This is Ashok\'s Pen.
If you want to keep (') apostrophe in the database use this below code:
$new_value = str_replace("'","\'", $value);
$new_value can store in database.
You can use this code,
<?php
$var = "This is Ashok's Pen.";
addslashes($var);
?>
if mysqli_real_escape_string() does not work.
In PHP, use mysqli_real_escape_string.
Example from the PHP Manual:
<?php
$link = mysqli_connect("localhost", "my_user", "my_password", "world");
/* check connection */
if (mysqli_connect_errno()) {
printf("Connect failed: %s\n", mysqli_connect_error());
exit();
}
mysqli_query($link, "CREATE TEMPORARY TABLE myCity LIKE City");
$city = "'s Hertogenbosch";
/* this query will fail, cause we didn't escape $city */
if (!mysqli_query($link, "INSERT into myCity (Name) VALUES ('$city')")) {
printf("Error: %s\n", mysqli_sqlstate($link));
}
$city = mysqli_real_escape_string($link, $city);
/* this query with escaped $city will work */
if (mysqli_query($link, "INSERT into myCity (Name) VALUES ('$city')")) {
printf("%d Row inserted.\n", mysqli_affected_rows($link));
}
mysqli_close($link);
?>
$var = mysqli_real_escape_string($conn, $_POST['varfield']);
If you are using PHP, just use the addslashes() function.
PHP Manual addslashes
For programmatic access, you can use placeholders to automatically escape unsafe characters for you.
In Perl DBI, for example, you can use:
my $string = "This is Ashok's pen";
$dbh->do("insert into my_table(my_string) values(?)",undef,($string));
Use either addslahes() or mysql_real_escape_string().
The way I do, by using Delphi:
TheString to "escape":
TheString=" bla bla bla 'em some more apo:S 'em and so on ";
Solution:
StringReplace(TheString, #39,'\'+#39, [rfReplaceAll, rfIgnoreCase]);
Result:
TheString=" bla bla bla \'em some more apo:S \'em and so on ";
This function will replace all Char(39) with "\'" allowing you to insert or update text fields in MySQL without any problem.
Similar functions are found in all programming languages!
Maybe you could take a look at function QUOTE in the MySQL manual.
This is how my data as API response looks like, which I want to store in the MYSQL database. It contains Quotes, HTML Code , etc.
Example:-
{
rewardName: "Cabela's eGiftCard $25.00",
shortDescription: '<p>adidas gift cards can be redeemed in over 150 adidas Sport Performance, adidas Originals, or adidas Outlet stores in the US, as well as online at adidas.com.</p>
terms: '<p>adidas Gift Cards may be redeemed for merchandise on adidas.com and in adidas Sport Performance, adidas Originals, and adidas Outlet stores in the United States.'
}
SOLUTION
CREATE TABLE `brand` (
`reward_name` varchar(2048),
`short_description` varchar(2048),
`terms` varchar(2048),
) ENGINE=InnoDB AUTO_INCREMENT=6 DEFAULT CHARSET=latin1;
While inserting , In followed JSON.stringify()
let brandDetails= {
rewardName: JSON.stringify(obj.rewardName),
shortDescription: JSON.stringify(obj.shortDescription),
term: JSON.stringify(obj.term),
}
Above is the JSON object and below is the SQL Query that insert data into MySQL.
let query = `INSERT INTO brand (reward_name, short_description, terms)
VALUES (${brandDetails.rewardName},
(${brandDetails.shortDescription}, ${brandDetails.terms})`;
Its worked....
If nothing works try this :
var res = str.replace(/'/g, "\\'");
var res = res.replace(/"/g, "\\\"");
It adds the \ escape character to all(every) occurrences of ' and "
Not sure if its the correct/professional way to fix the issue
I'm guessing it will work but in actual content, every single and double quotes will be replaced with \ character
As a Python user I replace the quote with a raw "'":
don_not_work_str = "This is Ashok's Pen."
work_str = don_not_work_str.replace("'", r"\'")
For Python，I tried many ways to escape '"', not work, cuz I have various input.
Finally, I just use these code, the data in database was same like the input.
tmp = val.replace('\\', r'\\')
ret = tmp.replace('"', r'\"')