(PHP 4 >= 4.2.0, PHP 5, PHP 7)
pg_query — Execute a query
$connection
], string $query
) : resource
pg_query() executes the query
on the specified database connection.
pg_query_params() should be preferred
in most cases.
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
connectioncan 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.
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().
queryThe 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.
String interpolation of user-supplied data is extremely dangerous and is likely to lead to SQL injection vulnerabilities. In most cases pg_query_params() should be preferred, passing user-supplied values as parameters rather than substituting them into the query string.
Any user-supplied data substituted directly into a query string should be properly escaped.
A query result resource on success or FALSE on failure.
Example #1 pg_query() example
<?php
$conn = pg_pconnect("dbname=publisher");
if (!$conn) {
echo "An error occurred.\n";
exit;
}
$result = pg_query($conn, "SELECT author, email FROM authors");
if (!$result) {
echo "An error occurred.\n";
exit;
}
while ($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);
?>