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Scaffolding PHP: Add an edit function

Posted on 2008-10-02
10
Medium Priority
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1,315 Views
Last Modified: 2013-12-12
I've been trying to add an edit function to this tutorials i've got from dot Net magazine which is a scaffolding PHP system, how can i achive edit and delete for this system, I've add the full code below:


<?php
	mysql_connect("localhost", "netusah", "blabla");
	mysql_select_db("mydb");
 
	function print_header() {
?>
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Strict//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-strict.dtd">
<html>
<head>
<title>Instaform!</title>
<style>
input.warn	{ border: 1px solid red; }
p.warn	{ color: red; font-weight: bold; }
</style>
</head>
 
<body>
 
<?php
	}
 
	function print_footer() {
?>
</body>
</html>
 
<?php
	}
 
	function pretty_print($string) {
		return ucfirst(str_replace("_", " ", $string));
	}
 
	function make_safe($array) {
		foreach($array as $var => $val) {
			$array[$var] = mysql_real_escape_string($val);
		}
 
		return $array;
	}
 
	function get_table_fields($table) {
		$result = mysql_query("SHOW FIELDS FROM $table;");
 
		$rows = array();
 
		while ($row = mysql_fetch_assoc($result)) {
			// if we're reading the primary key, skip it
			if ($row["Extra"] == "auto_increment") continue;
 
			$this_row = $row;
 
			if (stripos($row["Type"], "char") !== false) {
				$this_row["Type"] = "char";
			} else if (stripos($row["Type"], "text") !== false) {
				$this_row["Type"] = "text";
			} else if (stripos($row["Type"], "int") !== false) {
				$this_row["Type"] = "int";
			}
 
			$rows[$row["Field"]] = $this_row;
		}
 
		return $rows;
	}
 
	function validate_form($form, $table) {
		$problems = array();
 
		$fields = get_table_fields($table);
 
		if (count($form) != count($fields)) {
			$problems[] = "Fatal error.";
			return $problems;
		}
 
		foreach($fields as $name => $info) {
			if (!isset($form[$name])) {
				$problems[] = "Fatal error with $name.";
				return $problems;
			}
 
			if ($info["Null"] == "NO") {
				// this field must be provided!
				if (trim($form[$name]) == "") {
					$problems[$name] = "This field must be completed.";
				}
			}
		}
 
		return $problems;
	}
 
	function show_table_links($table) {
		$name = pretty_print($table);
 
		echo "<h1>$name</h1>";
		echo "<p><a href=\"create.php?type=$table\">New</a> | <a href=\"edit.php?type=$table\">Edit</a></p>";
 
		$fields = get_table_fields($table);
		$fields_query = implode(", ", array_keys($fields));
 
		echo "<table width=\"100%\">";
 
		echo "<tr>";
		foreach($fields as $field) {
			$field = pretty_print($field["Field"]);
			echo "<th>$field</th>";
		}
		echo "</tr>";
 
 
		$result = mysql_query("SELECT $fields_query FROM $table;");
 
		while ($row = mysql_fetch_assoc($result)) {
			echo "<tr>";
			foreach($row as $field) echo "<td>$field</td>";
			echo "</tr>";
		}
 
 
		echo "</table>";
	}
 
	function create_new($table) {
		echo "<h1>Create new item</h1>";
 
		$fields = get_table_fields($table);
 
		if (isset($_POST["save"])) {
			if (!isset($_POST[$table])) {
				echo "<p>Fatal error.</p>";
			} else {
				$form = make_safe($_POST[$table]);
 
				$error_list = validate_form($form, $table);
 
				if ($error_list == array()) {
					$query = "INSERT INTO $table (ID, " .
							implode(", ", array_keys($form)) .
							") VALUES ('', '" .
							implode("', '", array_values($form)) .
							"');";
 
					mysql_query($query);
 
					header("location: index.php");
					exit;
				}
			}
		}
 
		echo "<form method=\"post\">";
 
		foreach($fields as $field) {
			$pretty_name = pretty_print($field["Field"]);
 
			if (isset($_POST[$table][$field["Field"]])) {
				// value submitted already!
				$value = $_POST[$table][$field["Field"]];
			} else {
				if ($field["Default"] != "") {
					// got a default value!
					$value = $field["Default"];
				} else {
					// empty...
					$value = "";
				}
			}
 
			if (isset($error_list)) {
				if (isset($error_list[$field["Field"]])) {
					$error_class = "warn";
					$error_text = " - " . $error_list[$field["Field"]];
				} else {
					$error_class = "normal";
					$error_text = "";
				}
			} else {
				$error_class = "normal";
				$error_text = "";
			}
 
			echo "<p>$pretty_name: </p>";
 
			switch ($field["Type"]) {
				case "text":
					echo "<p class=\"$error_class\"><textarea class=\"$error_class\" name=\"{$table}[{$field["Field"]}]\">$value</textarea> $error_text</p>";
					break;
 
				default:
					echo "<p class=\"$error_class\"><input class=\"$error_class\" type=\"text\" name=\"{$table}[{$field["Field"]}]\" value=\"$value\" /> $error_text</p>";
			}
		}
 
		echo "<p><input type=\"hidden\" name=\"save\" value=\"true\" /></p>";
		echo "<p><input type=\"submit\" value=\"Create\" /></p>";
		echo "<p><a href=\"index.php\">Cancel</a></p>";
	}
?>

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Question by:ostrox
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10 Comments
 
LVL 19

Expert Comment

by:NerdsOfTech
ID: 22766048
UPDATE $table SET $field = $value

DELETE from $table WHERE $where_condition
0
 

Author Comment

by:ostrox
ID: 22795886
Where do I add this?
0
 
LVL 19

Expert Comment

by:NerdsOfTech
ID: 22802287
Basically you'll need to create a process page for deleting a row by the ID;
therefore, on your output function you will need a new link to delete.php.
looks like you are linking to edit.php already.

Did you add the edit.php link?
                echo "<h1>$name</h1>";
                echo "<p><a href=\"create.php?type=$table\">New</a> | <a href=\"edit.php?type=$table\">Edit</a></p>";

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LVL 19

Expert Comment

by:NerdsOfTech
ID: 22802288

                echo "<h1>$name</h1>";
                echo "<p><a href=\"create.php?type=$table\">New</a> | <a href=\"edit.php?type=$table\">Edit</a><a href=\"delete.php?type=$table\">Delete</a></p>";

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LVL 19

Expert Comment

by:NerdsOfTech
ID: 22802292
With your edit.php
READ the current roq and PREFILL the inputs with this data
Then,
You will need to run the SQL after sumbiting the new input information from edit.php
UPDATE table_name SET column_name = value [, column_name = value ...] [WHERE condition]

===

With your delete.php
You will need to run the SQL code on opening delete.php
DELETE FROM table_name [WHERE condition]
SQL Statement Syntax:
 
UPDATE table_name SET column_name = value [, column_name = value ...] [WHERE condition]
 
DELETE FROM table_name [WHERE condition]

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LVL 19

Expert Comment

by:NerdsOfTech
ID: 22802293
With your edit.php
READ the current roq and PREFILL the inputs with this data
Then,
You will need to run the SQL after sumbiting the new input information from edit.php
UPDATE table_name SET column_name = value [, column_name = value ...] [WHERE condition]

===

With your delete.php
You will need to run the SQL code on opening delete.php
DELETE FROM table_name [WHERE condition]
0
 
LVL 19

Accepted Solution

by:
NerdsOfTech earned 1500 total points
ID: 22802294
With your edit.php
READ the current ROW and PREFILL the inputs with this data
Then,
You will need to run the SQL after sumbiting the new input information from edit.php
UPDATE table_name SET column_name = value [, column_name = value ...] [WHERE condition]

===

With your delete.php
You will need to run the SQL code on opening delete.php
DELETE FROM table_name [WHERE condition]
0
 

Author Comment

by:ostrox
ID: 23025007
thanks for the replys ill get back to you soon if all worked
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