PHP Manual: Execute a query

Description

resource pg_query ([ resource $connection ], string $query )

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 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.

Warning
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.

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 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);

?>

pg_query

Description

Parameters

Return Values

Examples

See Also