Syntax errors when creating triggers
Question
I know this question has been thrown here in various forms, but I have gone through them all and not able to get solution to my issue. I don't understand why I keep getting this language error on this script. I have approached it following two different examples I saw here but it seems to be giving me the same error over and over. Im really having a hard time getting this trigger function to work, please I will appreciate any positive help from the PostgreSQL gurus here.
<?php
include ("connection.php");
$query = 'select * from fieldtally order by pipeno asc';
$result = pg_query($db_handle,$query);
while ($row = pg_fetch_row($result))
{
// Creates Arrays to use in dropdowns
$pipeno_array[] = $row[0];
}
// This function creates dropdowns that can be used in your forms
function dropdown($field_name, $num){
// Creates the Dropdown
echo "<select name=\"".$field_name."\" id=\"".$field_name.$num."\"\n";
echo "<option value=\"\"> --- Select --- </option>\n";
// Chooses which array to use for Dropdown options
global $pipeno_array;
$name_array = ($field_name == 'pipeno') ? $pipeno_array : $wthick;
// Creates the Dropdown options based off the array above
foreach($name_array as $k){
echo "<option value=\"$k\">$k</option> \n"; }
// Ends the Dropdown
echo "</select>\n";
}
?>
<html>
<head><title>UG Pipeline Fiedl Data Capture</title></head>
<body>
<form action="fieldtally.php" method="post">
<table width="800" cellpadding= "10" cellspacing="1" border="1">
<tr align="center" align="top">
<td align="center" colspan="1" rowspan="1" bgcolor="#64b1ff">
<h3>Input Field Tally Information</h3>
Select Wall Thickness:<select name="wthick" id="wthick">
<option value=""> --Select-- </option>
<option value="9.80"> 9.80 </option>
<option value="13.50"> 13.50 </option>
<option value="15.90"> 15.90 </option>
</Select>
Select Pipe No:<?php dropdown('pipeno', 1); ?> Select Pipe Manufacturer:<select name="manufacturer" id="manufacturer">
<!-- #7.1 -->
<option value=""> --Select-- </option>
<option value="KWH Pipe">KWH Pipe </option>
<option value="Atlas Tube">Atlas Tube</option>
<option value="Imperial Steel">Imperial Steel</option>
<option value="Lakeside">Lakeside</option>
<option value="Spiralco">Spiralco</option>
<option value="Muri metals">Muri metals</option>
<option value="WestLake">WestLake</option>
<option value="Westman Steel">Westman Steel</option>
<option value="Lockerbie & Hole">Lockerbie & Hole</option>
<option value="Nardei">Nardei</option>
</Select><br /><br />
Joint No: <input type="text" name="djointno"> Input measured Length: <input type="text" name="measuredlength"><br><br>
Input Serial No: <input type="text" name="serialno"><br><br>
<input type="Submit" name="submit" value="Submit">
</td></tr></table></form><p></p>
</form>
</body>
</html>
The field tally.php script is as shown below
<?php
$PGHOST = "localhost:25376";
$PGDATABASE = "Pipeline";
$PGUSER = "postgres";
$PGPASSWORD = "Casa2009";
$PGPORT = 5432;
$db_handle = pg_connect("dbname=$PGDATABASE user=$PGUSER
password=$PGPASSWORD");
if ($db_handle) {
echo 'Connection attempt succeeded.';
} else {
echo 'Connection attempt failed.';
}
$pipeno = pg_escape_string( $_POST['pipeno']);
$wthick = pg_escape_string($_POST['wthick']);
$djointno = pg_escape_string($_POST['djointno']);
$manufacturer = pg_escape_string($_POST['manufacturer']);
$measuredlength = pg_escape_string($_POST['measuredlength']);
$serialno = pg_escape_string($_POST['serialno']);
$query = "CREATE FUNCTION upsert (sql_update TEXT, sql_insert TEXT)
RETURNS VOID
LANGUAGE plpgsql
AS $$
BEGIN
LOOP
EXECUTE sql_update;
IF FOUND THEN
RETURN;
END IF;
BEGIN
EXECUTE sql_insert;
RETURN;
EXCEPTION WHEN unique_violation THEN
END;
END LOOP;
END;
$$";
$result = pg_query($query);
if (!$result) {
$errormessage = pg_last_error();
$message = "Error with query: " . $errormessage;
}
$message = sprintf ("These values were inserted into the pipeline database - %s %s %s %s %s %s",$wthick,$pipeno,$manufacturer,$djointno,$measuredlength,$serialno);
pg_close();
?>
1 answers
solution1
1 2012-10-31 12:37:30
Both those statements are pretty garbled. You need to read the PL/PgSQL trigger documentation , including the examples given there, to get an idea of the syntax.
Essentially, you first:
CREATE OR REPLACE FUNCTION func_name() RETURNS trigger AS $$
BEGIN
-- Trigger body here
END;
$$ LANGUAGE plpgsql;
then use that trigger function on a table:
CREATE TRIGGER trigger_name
BEFORE INSERT OR UPDATE OR DELETE ON tablename
FOR EACH STATEMENT EXECUTE PROCEDURE func_name();
Additionally, the trigger body in your code will never work. PostgreSQL doesn't support ON DUPLICATE KEY UPDATE . That's a MySQL-ism. You're looking for MERGE or UPSERT like behaviour, which is unfortunately rather difficult to do well in PostgreSQL. See this question .
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