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Last updated: Tue, 19 Sep 2006


(PHP 4 >= 4.2.0, PHP 5)

pg_query -- Execute a query


resource 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.



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().


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.


Example 1. pg_query() example


$conn = pg_pconnect("dbname=publisher");
if (!$conn) {
  echo "An error occured.\n";

$result = pg_query($conn, "SELECT author, email FROM authors");
if (!$result) {
  echo "An error occured.\n";

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


$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);


Last updated: Tue, 19 Sep 2006