根据主键值而不是行号检索PHP中的特定MySQL字段数据

Question

I'm trying to find the correct way of pulling specific field data from a MySQL database and referencing it on a web page, using the primary key (an INT) in the row of data instead of the row number. we tried:

$sql = "SELECT * FROM ourTable";
$result = mysql_result($sql, $con);
echo mysql_results($sql,$con);
echo mysql_result($result, 2, "pageTitle");
echo "<br />";
echo mysql_result($result, 2, "pageDate");`

But this returns values based on row number. Instead we would like to make reference to the pageID in our database to populate the pageTitle and pageDate information.

(The $con variable is referenced before this block)

so say in my database I have:

pageID pageTitle pageDate
001 Page1 1885
002 Page2 1976
003 Page3 1776

As an example, on the web page, the data will be printed like:

Title: Page1
Date: 1885

Thanks in advance for any help.

Answer 1

Your query is selecting all rows from the table. You later extract a row by its position in the results array. However, you should never make any assumptions about the order that your rows are stored or returned, unless you're using the ORDER BY keyword. Otherwise, you're not guaranteed that your rows will be returned in the order that you inserted them.

Like MichaelMior said, you can use the WHERE keyword to select a row based on the value of a column.

$id = "001";
$sql = "SELECT * FROM ourTable WHERE pageID='$id'";
$result = mysql_result($sql, $con);

// Since you're selecting based on a unique key, you'll get only 0 or 1 rows
if( mysql_num_rows($result) == 1)
{
  // Parse the result
  echo mysql_result($result, 0, "pageTitle");
  echo "<br />";
  echo mysql_result($result, 0, "pageDate");
}

Edit, clarification: A primary key is by definition unique.