pg_query (PHP 4 >= 4.2.0, PHP 5) pg_query -- Execute a query Descriptionresource pg_query ( string query ) resource pg_query ( resource connection, string query )
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";
}
?>
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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);
?>
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