silverstripe-postgresql/code/PostgreSQLDatabaseConfigurationHelper.php

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<?php
/**
* This is a helper class for the SS installer.
*
* It does all the specific checking for PostgreSQLDatabase
* to ensure that the configuration is setup correctly.
*
* @package postgresql
*/
class PostgreSQLDatabaseConfigurationHelper implements DatabaseConfigurationHelper {
/**
* Ensure that the database function pg_connect
* is available. If it is, we assume the PHP module for this
* database has been setup correctly.
*
* @param array $databaseConfig Associative array of database configuration, e.g. "server", "username" etc
* @return boolean
*/
public function requireDatabaseFunctions($databaseConfig) {
return (function_exists('pg_connect')) ? true : false;
}
/**
* Ensure that the database server exists.
* @param array $databaseConfig Associative array of db configuration, e.g. "server", "username" etc
* @return array Result - e.g. array('success' => true, 'error' => 'details of error')
*/
public function requireDatabaseServer($databaseConfig) {
$success = false;
$error = '';
$username = $databaseConfig['username'] ? $databaseConfig['username'] : '';
$password = $databaseConfig['password'] ? $databaseConfig['password'] : '';
$server = $databaseConfig['server'];
$userPart = $username ? " user=$username" : '';
$passwordPart = $password ? " password=$password" : '';
$connstring = "host=$server port=5432 dbname=postgres {$userPart}{$passwordPart}";
$conn = @pg_connect($connstring);
if($conn) {
$success = true;
} else {
$success = false;
$error = 'PostgreSQL requires a valid username and password to determine if the server exists.';
}
return array(
'success' => $success,
'error' => $error
);
}
/**
* Ensure a database connection is possible using credentials provided.
* @param array $databaseConfig Associative array of db configuration, e.g. "server", "username" etc
* @return array Result - e.g. array('success' => true, 'error' => 'details of error')
*/
public function requireDatabaseConnection($databaseConfig) {
$success = false;
$error = '';
$username = $databaseConfig['username'] ? $databaseConfig['username'] : '';
$password = $databaseConfig['password'] ? $databaseConfig['password'] : '';
$server = $databaseConfig['server'];
$userPart = $username ? " user=$username" : '';
$passwordPart = $password ? " password=$password" : '';
$connstring = "host=$server port=5432 dbname=postgres {$userPart}{$passwordPart}";
$conn = @pg_connect($connstring);
if($conn) {
$success = true;
} else {
$success = false;
$error = '';
}
return array(
'success' => $success,
'connection' => $conn,
'error' => $error
);
}
public function getDatabaseVersion($databaseConfig) {
$version = 0;
$username = $databaseConfig['username'] ? $databaseConfig['username'] : '';
$password = $databaseConfig['password'] ? $databaseConfig['password'] : '';
$server = $databaseConfig['server'];
$userPart = $username ? " user=$username" : '';
$passwordPart = $password ? " password=$password" : '';
$connstring = "host=$server port=5432 dbname=postgres {$userPart}{$passwordPart}";
$conn = @pg_connect($connstring);
$info = @pg_version($conn);
$version = ($info && isset($info['server'])) ? $info['server'] : null;
if(!$version) {
// fallback to using the version() function
$result = @pg_query($conn, "SELECT version()");
$row = @pg_fetch_array($result);
if($row && isset($row[0])) {
$parts = explode(' ', trim($row[0]));
// ASSUMPTION version number is the second part e.g. "PostgreSQL 8.4.3"
$version = trim($parts[1]);
}
}
return $version;
}
/**
* Ensure that the PostgreSQL version is at least 8.3.
* @param array $databaseConfig Associative array of db configuration, e.g. "server", "username" etc
* @return array Result - e.g. array('success' => true, 'error' => 'details of error')
*/
public function requireDatabaseVersion($databaseConfig) {
$success = false;
$error = '';
$version = $this->getDatabaseVersion($databaseConfig);
if($version) {
$success = version_compare($version, '8.3', '>=');
if(!$success) {
$error = "Your PostgreSQL version is $version. It's recommended you use at least 8.3.";
}
} else {
$error = "Your PostgreSQL version could not be determined.";
}
return array(
'success' => $success,
'error' => $error
);
}
/**
* Ensure that the database connection is able to use an existing database,
* or be able to create one if it doesn't exist.
*
* @param array $databaseConfig Associative array of db configuration, e.g. "server", "username" etc
* @return array Result - e.g. array('success' => true, 'alreadyExists' => 'true')
*/
public function requireDatabaseOrCreatePermissions($databaseConfig) {
$success = false;
$alreadyExists = false;
$check = $this->requireDatabaseConnection($databaseConfig);
$conn = $check['connection'];
$result = pg_query($conn, "SELECT datname FROM pg_database WHERE datname = '$databaseConfig[database]'");
if(pg_fetch_array($result)) {
$success = true;
$alreadyExists = true;
} else {
if(@pg_query($conn, "CREATE DATABASE testing123")) {
pg_query($conn, "DROP DATABASE testing123");
$success = true;
$alreadyExists = false;
}
}
return array(
'success' => $success,
'alreadyExists' => $alreadyExists
);
}
/**
* Ensure we have permissions to alter tables.
*
* @param array $databaseConfig Associative array of db configuration, e.g. "server", "username" etc
* @return array Result - e.g. array('okay' => true, 'applies' => true), where applies is whether
* the test is relevant for the database
*/
public function requireDatabaseAlterPermissions($databaseConfig) {
return array('success' => true, 'applies' => false);
}
}