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Database.php
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Database.php
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<?php
namespace Sleek;
class Database extends \MySQLi {
/**
* @var Database The singleton instance of our database class
*/
static private $_instance = NULL;
/**
* @var string The last query which was executed by this class
*/
protected $lastQuery = '';
/**
* Prefents the database class from being instantiated multiple times
*/
private function __construct() {
$settings = Config::get('database');
return parent::__construct($settings['host'], $settings['user'], $settings['pass'], $settings['name']);
}
/**
* Prevents the database class from being cloned
* @return null
*/
private function __clone() { }
/**
* Returns the singleton instance of the Database class
* @return \Sleek\Database
*/
public static function getInstance() {
if (!self::$_instance) {
self::$_instance = new Database();
}
return self::$_instance;
}
/**
* Sets which database this database class will be using. If you switch it a lot it may confuse different models.
* @param string $database
* @return null
*/
public function selectDatabase($database) {
return $this->select_db($database);
}
/**
* Executes a query which returns rows. Use it with SELECT statements.
* @param string $query
* @return DatabaseResult|bool
*/
public function query($query) {
$this->lastQuery = $query;
$result = parent::query($query);
if ($result) {
return is_bool($result) ? $result : new DatabaseResult($result);
}
return FALSE;
}
/**
* Executes a "Simple" query, that is, a query which doesn't return rows. Returns the affected rows.
* Use this for INSERT, UPDATE, DELETE statements. With an INSERT, you'll likely also want to run lastId();
* @param string $query
* @return int|bool
*/
public function querySimple($query) {
$this->lastQuery = $query;
$result = $this->query($query);
if ($result) {
return $this->affected_rows;
}
return FALSE;
}
/**
* Returns the last auto incrememnt ID generated from an INSERT statement
* @return int
*/
public function lastId() {
return $this->insert_id;
}
/**
* Returns the last error message generated by MySQL
* @return string
*/
public function lastError() {
return $this->error;
}
/**
* Returns the SQL used in the last query (useful for debugging generated queries)
* @return string
*/
public function lastQuery() {
return $this->lastQuery;
}
/**
* Returns the number of affected rows from the last executed query
* @return int
*/
public function affectedRows() {
return $this->affected_rows;
}
/**
* This function adds a row to the table with the specified criteria, returning the newly created row's ID
* @param string $table
* @param array $data (associative array of column -> value)
* @return int|bool
*/
public function insert($table, $data) {
$sql = "INSERT INTO $table SET ";
$interim = array();
foreach($data AS $key => $value) {
$interim[] = "`$key` = '" . self::real_escape_string($value) . "'";
}
$data = implode($interim, ',');
$sql .= $data;
if ($this->executeRawQuery($sql)) {
return $this->insert_id;
} else {
return FALSE;
}
}
/**
* This function deletes row(s) from a table depending on the criteria
* @param string $table
* @param array $where (associative array of column -> value, AND separated)
* @return int|bool
*/
public function delete($table, $where) {
$sql = "DELETE FROM $table WHERE ";
$interim = array();
foreach($where AS $key => $value) {
$interim[] = "`$key` = '" . self::real_escape_string($value) . "'";
}
$data = implode($interim, ' AND ');
$sql .= $data;
if ($this->executeRawQuery($sql)) {
return $this->affected_rows;
} else {
return FALSE;
}
}
/**
* This function generates and executes a MySQL WHERE statement, returning the number of affected rows
* @param string $table
* @param array $data (associative array of column -> value)
* @param array $where (associative array of column -> value, AND separated)
* @return int|bool
*/
public function update($table, $data, $where) {
$sql = "UPDATE $table SET ";
$interim = array();
foreach($data AS $key => $value) {
$interim[] = "`$key` = '" . self::real_escape_string($value) . "'";
}
$data = implode($interim, ',');
$sql .= $data;
if ($where) {
$sql .= " WHERE ";
$interim = array();
foreach($where AS $key => $value) {
$interim[] = "`$key` = '" . self::real_escape_string($value) . "'";
}
$data = implode($interim, ' AND ');
$sql .= $data;
}
if ($this->executeRawQuery($sql)) {
return $this->affected_rows;
} else {
return FALSE;
}
}
/**
* This function generates and executes a SQL SELECT statement, returning the results
* @param string $table
* @param array $columns
* @param array $where (associative, column -> value)
* @param int $limit
* @param int $offset
* @return \Sleek\DatabaseResult|bool
*/
public function select($table, $columns, $where = array(), $limit = NULL, $offset = NULL) {
if ($limit !== NULL) {
$limit = (int) $limit;
}
if ($offset !== NULL) {
$offset = (int) $offset;
}
$sql = "SELECT ";
if (is_array($columns)) {
$interim = array();
foreach($columns AS $column) {
$interim[] = (string) $column;
}
$data = implode($interim, ', ');
$sql .= $data;
} else if (is_string($columns)) {
$sql .= $columns;
}
$sql .= " FROM $table";
if ($where) {
$sql .= " WHERE ";
$interim = array();
foreach($where AS $key => $value) {
$interim[] = "`$key` = '" . self::real_escape_string($value) . "'";
}
$data = implode($interim, ' AND ');
$sql .= $data;
}
if ($limit) {
$sql .= " LIMIT $limit";
if ($offset) {
$sql .= " OFFSET $offset";
}
}
$result = $this->executeRawQuery($sql);
if ($result) {
return $result;
}
return FALSE;
}
/**
* This function executes the provided query, sets the lastQuery in the class, and returns the result
* Note that not all queries will return rows. This function is protected as other query functions should run it
* @param string $query
* @return \Resource
*/
protected function executeRawQuery($query) {
$this->lastQuery = $query;
return $this->query($query);
}
}