This tutorial goes along with several others that use the same news database such as Add a Row to mySQL, Displaying a Database, and Deleting a Row In mySQL. There are many reasons you might want to edit one of the rows in your mySQL database. Say for instance, you made a spelling error in one of your news posts and you want to edit it.
We have a database called ecore_news, with a table called news. In the mySQL news table, we have 6 fields: id, title, message, who, date, and time. You can see the mySQL code here: mysql.txt. Open up a new HTML page, save it as edit.php and write all of the following code inside the Body tag. You can see my code that I worked on and made sure worked by right clicking and saving edit.txt.
Editing a mySQL row is basically a three step process. The first process involves displaying all the rows so you can select one to edit. The next step lets you edit the information for the row, and then the final step involves placing the new edits you made into the mySQL database. Lets get started by writing the code to display all the rows. ecore enthusiasts would know that this step and code is almost identical to the one at "Deleting a Row in mySQL." Here is what we have to write in English to pick a row to edit:
1. Connect to the mySQL
2. If a command to edit has not been initialized, then display all the news posts
3. When displaying, make the title a link that would go to edit that particular post
Code: Select all
<?
//connect to mysql
//change user and password to your mySQL name and password
mysql_connect("localhost","user","password");
//select which database you want to edit
mysql_select_db("ecore_news");
//If cmd has not been initialized
if(!isset($cmd))
{
//display all the news
$result = mysql_query("select * from news order by id");
//run the while loop that grabs all the news scripts
while($r=mysql_fetch_array($result))
{
//grab the title and the ID of the news
$title=$r["title"];//take out the title
$id=$r["id"];//take out the id
//make the title a link
echo "<a href='edit.php?cmd=edit&id=$id'>$title - Edit</a>";
echo "<br>";
}
}
?>Code: Select all
<?
if($_GET["cmd"]=="edit" || $_POST["cmd"]=="edit")
{
if (!isset($_POST["submit"]))
{
$id = $_GET["id"];
$sql = "SELECT * FROM news WHERE id=$id";
$result = mysql_query($sql);
$myrow = mysql_fetch_array($result);
?>
<form action="edit.php" method="post">
<input type=hidden name="id" value="<?php echo $myrow["id"] ?>">
Title:<INPUT TYPE="TEXT" NAME="title" VALUE="<?php echo $myrow["title"] ?>" SIZE=30><br>
Message:<TEXTAREA NAME="message" ROWS=10 COLS=30><? echo $myrow["message"] ?></TEXTAREA><br>
Who:<INPUT TYPE="TEXT" NAME="who" VALUE="<?php echo $myrow["who"] ?>" SIZE=30><br>
<input type="hidden" name="cmd" value="edit">
<input type="submit" name="submit" value="submit">
</form>
<? } ?>The third part is fairly, simple. Take a look:
Code: Select all
<?
if ($_POST["$submit"])
{
$title = $_POST["title"];
$message = $_POST["message"];
$who = $_POST["who"];
$sql = "UPDATE news SET title='$title',message='$message',who='$who' WHERE id=$id";
$result = mysql_query($sql);
echo "Thank you! Information updated.";
}
}
?>