PHP，如何检查MySQL表是否有名称

Question

I am trying to connect to the MySQL database to check a table (builditblocks) to see if there is data the user gave in the "name" column.

Here is what I have so far:

<?php
 $temp=mysqli_query($con, "SELECT * FROM `builditblocks`.`module_index`.`name`");
 $i = 0;
 while($module = mysqli_fetch_array($temp))
 {
   "moduleArray[".$i."]=\"" . $module["name"]."\";" ;
   $i++
   //stuck here I need to know how to
   //store them all in an array and check
   //to see if the input matches any array elements
 }

How do I check the table if it has the name?

Answer 1

At first, push names to new array and check with in_array

$modules = array();
while($module = mysqli_fetch_array($temp))
{
   $modules[] = $module['name'];
}

if(in_array($_POST['input'], $modules))
    echo "I found";
else
    echo "Not found";

Answer 2

You might want to try the "WHERE" clause combined with "LIKE".

$temp = mysqli_query($con, "SELECT * FROM `builditblocks`.`module_index`.`name` WHERE `name` LIKE '%input%'");

The above code will give you only the records that contain "input" in their name. Look http://dev.mysql.com/doc/refman/5.0/en/string-comparison-functions.html#operator_like for more information.

Answer 3

To find if a name exists in your database, all you need to do is add a WHERE to your SQL query.

$name = $module['name'];

"SELECT * FROM 'builditblocks'.'module_index'.'name' WHERE name = '".$name."'"

Then check to see if that returns anything. If so, the name exists, if not then it does not exist.

Answer 4

Try the following:

$name = $module["name"]; // Assign your user input to a variable
$temp = mysqli_query($con, "SELECT * FROM builditblocks.module_index WHERE name = '" . $name . "'"; // Get all fields from table where the name field equals the user input.
if ($temp) {
    // If any records were returned the name exists
} else {
    // Otherwise the name doesn't exist
}

Hope this helps.