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Website Programming in PHP / MYSQL
pg_query
(PHP 4 >= 4.2.0, PHP 5)
pg_query — Execute a query
Description
pg_query() executes the query on the specified database connection .
If an error occurs, and FALSE is returned, details of the error can be retrieved using the pg_last_error() function if the connection is valid.
Note: Although connection can be omitted, it is not recommended, since it can be the cause of hard to find bugs in scripts.
Note: This function used to be called pg_exec(). pg_exec() is still available for compatibility reasons, but users are encouraged to use the newer name.
Parameters
- connection
-
PostgreSQL database connection resource. When connection is not present, the default connection is used. The default connection is the last connection made by pg_connect() or pg_pconnect().
- query
-
The SQL statement or statements to be executed. When multiple statements are passed to the function, they are automatically executed as one transaction, unless there are explicit BEGIN/COMMIT commands included in the query string. However, using multiple transactions in one function call is not recommended.
Return Values
A query result resource on success, or FALSE on failure.
Examples
Example #1 pg_query() example
<?php
$conn = pg_pconnect("dbname=publisher");
if (!$conn) {
echo "An error occured.\n";
exit;
}
$result = pg_query($conn, "SELECT author, email FROM authors");
if (!$result) {
echo "An error occured.\n";
exit;
}
while ($row = pg_fetch_row($result)) {
echo "Author: $row[0] E-mail: $row[1]";
echo "<br />\n";
}
?>
Example #2 Using pg_query() with multiple statements
<?php
$conn = pg_pconnect("dbname=publisher");
// these statements will be executed as one transaction
$query = "UPDATE authors SET author=UPPER(author) WHERE id=1;";
$query .= "UPDATE authors SET author=LOWER(author) WHERE id=2;";
$query .= "UPDATE authors SET author=NULL WHERE id=3;";
pg_query($conn, $query);
?>
