Error with simple PHP form with MySQL - php

Question

Sirs,
I'm getting an error from my PHP script, probably the query, but I can't figure out what's going on. I can connect the database, but I still get the error from de "echo ERROR" line.
Does anyone know what's wrong with my code? I appreciate any help! I spent a few hours to solve this issue, but couldn't get nothing.
HTML form
<form action="insert-info.php" method="post">
<input class="form1" type="text" value="TEXT ONE" name="textone" onfocus="if (this.value=='NTEXT ONE') this.value='';"/>
<input class="form1" type="text" value="TEXT TWO" name="texttwo" onfocus="if (this.value=='TEXT TWO') this.value='';"/>
<input class="form2" type="text" value="TEXT THREE" name="textthree" onfocus="if (this.value=='TEXT THREE') this.value='';"/>
</form>
Database connect and insert
<?php
$host="localhost"; // Host name
$username="***"; // Mysql username
$password="***"; // Mysql password
$db_name="***"; // Database name
$tbl_name="insertinfo"; // Table name
// Connect to server and select database.
mysql_connect("$host", "$username", "$password")or die("cannot connect");
mysql_select_db("$db_name")or die("cannot select DB");
// Get values from form
$textone=$_POST['textone'];
$texttwo=$_POST['texttwo'];
$textthree=$_POST['textthree'];
// Insert data into mysql
$sql="INSERT INTO $tbl_name('textone', 'texttwo', 'textthree') VALUES ('$textone', '$texttwo', '$textthree')";
$result=mysql_query($sql);
// if successfully insert data into database, displays message "Successful".
if($result){
echo "Successful";
echo "<br />";
echo "<a href='insert.php'>Back to main page</a>";
}
else {
echo "ERROR";
}
?>
<?php
// close connection
mysql_close();
?>
Database structure
# Type Collation Null Pattern Extra
1 id int(4) None (none) AUTO_INCREMENT
2 textone varchar(50) utf8_bin None (none)
3 texttwo varchar(50) utf8_bin None (none)
4 textthree varchar(50) utf8_bin None (none)

Answer 1

Looks like the issue is just the column names of your INSERT query. You don't need single quotes around those.
$sql="INSERT INTO $tbl_name(textone, texttwo, textthree) VALUES ('$textone', '$texttwo', '$textthree')";
That should work.
EDIT: echo_Me and Mayank's warnings and recommendations are necessary to consider for production code!

Answer 2

actually you are not selecting database and the connection variables. because you are using strings. you need to remove the quotes like that
mysql_connect($host, $username, $password)or die("cannot connect");
mysql_select_db($db_name)or die("cannot select DB");
there is some things you need to fix in your code .
escape your POST variables.
change to PDO or MYSQLI.
follow the error by echoing system error.

Answer 3

Use mysql_error() to print the error message. It will tell you more about why the query failed. Note that this function is deprecated. I recommend to use mysqli or PDO database classes.

Answer 4

$sql=sprintf(
"INSERT INTO
$tbl_name(textone, texttwo, textthree)
VALUES ('%s','%s','%s')",
mysql_real_escape_string($textone),
mysql_real_escape_string($texttwo),
mysql_real_escape_string($textthree)
);

Answer 5

Try Like this
There is no need to give column names within ' ' in INSERT query.
$sql="INSERT INTO $tbl_name(textone,texttwo,textthree) VALUES ('$textone', '$texttwo', '$textthree')";
$result=mysql_query($sql);