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<?php
abstract class dbeng_abs {
protected $_batchInsertChunks = 500;
private $_error = '';
/*
* Connects to the database
*/
abstract function connect();
/*
* Executes the query and discards any output. Returns true of no
* error was found. No handling of the SQL statement is done
*/
abstract function rawExec($sql);
/*
* Executes the query with $params as parameters. All parameters are
* parsed through sthe safe() function to prevent SQL injection.
*
* Returns a single associative array when query succeeds, returns
* an exception when the query fails.
*/
abstract function singleQuery($sql, $params = array());
/*
* Executes the query with $params as parameters. All parameters are
* parsed through sthe safe() function to prevent SQL injection.
*
*
* Returns an array of associative arrays when query succeeds, returns
* an exception when the query fails.
*/
abstract function arrayQuery($sql, $params = array());
/*
* Database specific 'escape' or 'safe' function to escape strings
*/
abstract function safe($s);
/*
* Returns a database specific representation of a boolean value
*/
abstract function bool2dt($b);
/*
* Returns the amount of effected rows
*/
abstract function rows();
/*
* Begins an transaction
*/
abstract function beginTransaction();
/*
* Commits an transaction
*/
abstract function commit();
/*
* Rolls back an transaction
*/
abstract function rollback();
/*
* Returns the last insertid
*/
abstract function lastInsertId($tableName);
/*
* Prepares the query string by running vsprintf() met safe() thrown around it
*/
function prepareSql($s, $p) {
/*
* When no parameters are given, we don't run vsprintf(). This makes sure
* we can use arrayQuery() and singleQuery() with for example LIKE statements
*/
if (empty($p)) {
return $s;
} else {
$p = array_map(array($this, 'safe'), $p);
return vsprintf($s, $p);
} # else
} # prepareSql()
/*
* Executes the query and returns the (resource or handle)
*/
function exec($s, $p = array()) {
return $this->rawExec($this->prepareSql($s, $p));
} # exec()
/*
* INSERT or UPDATE statement, doesn't return anything. Exception
* thrown if a error occurs
*/
abstract function modify($s, $p = array());
/*
* Transforms an array of keys to an list usable by an
* IN statement
*/
function arrayKeyToIn($ar) {
$tmpList = '';
foreach($ar as $k => $v) {
$tmpList .= "'" . $this->safe($k) . "', ";
} # foreach
return substr($tmpList, 0, -2);
} # arrayKeyToIn
/*
* Transforms an array of values to an list usable by an
* IN statement
*/
function arrayValToInOffset($ar, $val, $valOffset, $valEnd) {
$tmpList = '';
foreach($ar as $k => $v) {
$tmpList .= "'" . $this->safe(substr($v[$val], $valOffset, $valEnd)) . "', ";
} # foreach
return substr($tmpList, 0, -2);
} # arrayValToInOffset
/*
* Transforms an array of values to an list usable by an
* IN statement
*/
function arrayValToIn($ar, $val) {
$tmpList = '';
foreach($ar as $k => $v) {
$tmpList .= "'" . $this->safe($v[$val]) . "', ";
} # foreach
return substr($tmpList, 0, -2);
} # arrayValToIn
/*
* Transforms an array of values to an list usable by an
* IN statement
*/
function batchInsert($ar, $sql, $tpl, $fields) {
$this->beginTransaction();
/*
* Databases usually have a maximum packet size length,
* so just sending down 100kbyte of text usually ends
* up in tears.
*/
$chunks = array_chunk($ar, $this->_batchInsertChunks);
foreach($chunks as $items) {
$insertArray = array();
foreach($items as $item) {
/*
* Add this items' fields to an array in
* the correct order and nicely escaped
* from any injection
*/
$itemValues = array();
foreach($fields as $idx => $field) {
$itemValues[] = $this->safe($item[$field]);
} # foreach
$insertArray[] = vsprintf($tpl, $itemValues);
} # foreach
# Actually insert the batch
if (!empty($insertArray)) {
$this->modify($sql . implode(',', $insertArray), array());
} # if
} # foreach
$this->commit();
} # batchInsert
} # dbeng_abs
|
