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<?php
/*
* Class DBConnection
* Create a database connection using PDO
* @author jonahlyn@unm.edu
*
* Instructions for use:
*
* require_once('settings.config.php'); // Define db configuration arrays here
* require_once('DBConnection.php'); // Include this file
*
* $database = new DBConnection($dbconfig); // Create new connection by passing in your configuration array
*
* $sqlSelect = "select * from ....."; // Select Statements:
* $rows = $database->getQuery($sqlSelect); // Use this method to run select statements
*
* foreach($rows as $row){
* echo $row["column"] . "<br/>";
* }
*
* $sqlInsert = "insert into ...."; // Insert/Update/Delete Statements:
* $count = $database->runQuery($sqlInsert); // Use this method to run inserts/updates/deletes
* echo "number of records inserted: " . $count;
*
* $name = "jonahlyn"; // Prepared Statements:
* $stmt = $database->dbc->prepare("insert into test (name) values (?)");
* $stmt->execute(array($name));
*
*/
Class DBConnection {
// Database Connection Configuration Parameters
// array('driver' => 'mysql','host' => '','dbname' => '','username' => '','password' => '')
protected $_config;
// Database Connection
public $dbc;
/* function __construct
* Opens the database connection
* @param $config is an array of database connection parameters
*/
public function __construct( array $config ) {
$this->_config = $config;
$this->getPDOConnection();
}
/* Function __destruct
* Closes the database connection
*/
public function __destruct() {
$this->dbc = NULL;
}
/* Function getPDOConnection
* Get a connection to the database using PDO.
*/
private function getPDOConnection() {
// Check if the connection is already established
if ($this->dbc == NULL) {
// Create the connection
$dsn = "" .
$this->_config['driver'] .
":host=" . $this->_config['host'] .
";dbname=" . $this->_config['dbname'];
try {
$this->dbc = new PDO( $dsn, $this->_config[ 'username' ], $this->_config[ 'password' ], array(PDO::MYSQL_ATTR_INIT_COMMAND => "SET NAMES 'utf8mb4' COLLATE 'utf8mb4_unicode_ci'",) );
} catch( PDOException $e ) {
echo __LINE__.$e->getMessage();
}
}
}
/* Function runQuery
* Runs a insert, update or delete query
* @param string sql insert update or delete statement
* @return int count of records affected by running the sql statement.
*/
public function runQuery( $sql ) {
try {
$count = $this->dbc->exec($sql) or print_r($this->dbc->errorInfo());
} catch(PDOException $e) {
echo __LINE__.$e->getMessage();
}
return $count;
}
/* Function getQuery
* Runs a select query
* @param string sql insert update or delete statement
* @returns associative array
*/
public function getQuery( $sql ) {
$stmt = $this->dbc->query( $sql );
$stmt->setFetchMode(PDO::FETCH_ASSOC);
return $stmt;
}
}