The PDOStatement class
(PHP 5 >= 5.1.0, PECL pdo >= 1.0.0)
Introduction
Represents a prepared statement and, after the statement is executed, an associated result set.
Class synopsis
PDOStatement
implements
Traversable
{
/* Properties */
/* Methods */
public bool bindColumn
( mixed
$column
, mixed &$param
[, int $type
[, int $maxlen
[, mixed $driverdata
]]] )
public bool bindParam
( mixed
$parameter
, mixed &$variable
[, int $data_type = PDO::PARAM_STR
[, int $length
[, mixed $driver_options
]]] )
public mixed fetch
([ int
}$fetch_style
[, int $cursor_orientation = PDO::FETCH_ORI_NEXT
[, int $cursor_offset = 0
]]] )Properties
- queryString
-
Used query string.
Table of Contents
- PDOStatement::bindColumn — Bind a column to a PHP variable
- PDOStatement::bindParam — Binds a parameter to the specified variable name
- PDOStatement::bindValue — Binds a value to a parameter
- PDOStatement::closeCursor — Closes the cursor, enabling the statement to be executed again.
- PDOStatement::columnCount — Returns the number of columns in the result set
- PDOStatement::debugDumpParams — Dump an SQL prepared command
- PDOStatement::errorCode — Fetch the SQLSTATE associated with the last operation on the statement handle
- PDOStatement::errorInfo — Fetch extended error information associated with the last operation on the statement handle
- PDOStatement::execute — Executes a prepared statement
- PDOStatement::fetch — Fetches the next row from a result set
- PDOStatement::fetchAll — Returns an array containing all of the result set rows
- PDOStatement::fetchColumn — Returns a single column from the next row of a result set
- PDOStatement::fetchObject — Fetches the next row and returns it as an object.
- PDOStatement::getAttribute — Retrieve a statement attribute
- PDOStatement::getColumnMeta — Returns metadata for a column in a result set
- PDOStatement::nextRowset — Advances to the next rowset in a multi-rowset statement handle
- PDOStatement::rowCount — Returns the number of rows affected by the last SQL statement
- PDOStatement::setAttribute — Set a statement attribute
- PDOStatement::setFetchMode — Set the default fetch mode for this statement
Коментарии
I don't know why PDOStatement don't return "execution time" and "found rows" so here I created an extended class of PDOStatement with these attributes.
Just have to "setAttribute" of PDO's object to $PDO->setAttribute(\PDO::ATTR_STATEMENT_CLASS , ['\customs\PDOStatement', [&$this]]);
<?php
/**
*
*
*
*/
namespace customs;
/**
*
*
*
*/
final class PDOStatement extends \PDOStatement {
/**
*
*
*
*/
protected $PDO = null;
protected $inputParams = [];
protected $executionTime = 0;
protected $resultCount = 0;
/**
*
*
*
*/
protected function __construct(PDO &$PDO) {
$this->PDO = $PDO;
$this->executionTime = microtime(true);
}
/**
*
*
*
*/
final public function getExecutionError(int $i = 2) {
$executionError = $this->errorInfo();
if (isset($executionError[$i]))
return $executionError[$i];
return $executionError;
}
/**
*
*
*
*/
final public function getExecutionTime($numberFormat = false, $decPoint = '.', $thousandsSep = ',') {
if (is_numeric($numberFormat))
return number_format($this->executionTime, $numberFormat, $decPoint, $thousandsSep);
return $this->executionTime;
}
/**
*
*
*
*/
final public function getResultCount($numberFormat = false, $decPoint = '.', $thousandsSep = ',') {
if (is_numeric($numberFormat))
return number_format($this->resultCount, $numberFormat, $decPoint, $thousandsSep);
return $this->resultCount;
}
/**
*
*
*
*/
final public function getLastInsertId() {
return $this->PDO->lastInsertId();
}
/**
*
*
*
*/
final public function bindValues(array $inputParams) {
foreach ($this->inputParams = array_values($inputParams) as $i => $value) {
$varType = is_null($value) ? \PDO::PARAM_NULL : is_bool($value) ? \PDO::PARAM_BOOL : is_int($value) ? \PDO::PARAM_INT : \PDO::PARAM_STR;
if (!$this->bindValue(++ $i, $value, $varType))
return false;
}
return true;
}
/**
*
*
*
*/
final public function execute($inputParams = null) {
if ($inputParams)
$this->inputParams = $inputParams;
if ($executed = parent::execute($inputParams))
$this->executionTime = microtime(true) - $this->executionTime;
return $executed;
}
/**
*
*
*
*/
final public function fetchAll($how = null, $className = null, $ctorArgs = null) {
$resultSet = parent::fetchAll(... func_get_args());
if (!empty($resultSet)) {
$queryString = $this->queryString;
$inputParams = $this->inputParams;
if (preg_match('/(.*)?LIMIT/is', $queryString, $match))
$queryString = $match[1];
$queryString = sprintf('SELECT COUNT(*) AS T FROM (%s) DT', $queryString);
if (($placeholders = substr_count($queryString, '?')) < count($inputParams))
$inputParams = array_slice($inputParams, 0, $placeholders);
if (($sth = $this->PDO->prepare($queryString)) && $sth->bindValues($inputParams) && $sth->execute())
$this->resultCount = $sth->fetchColumn();
$sth = null;
}
return $resultSet;
}
}
?>
I think I found a way to execute a protected SQL query and at the same time find out the number of affected records.
I have the table 'tbl_users' with the following fields: id, login, password, age
<?
const DB_DRIVER = "mysql";
const DB_HOST = "localhost";
const DB_NAME = "my_db_name";
const DB_LOGIN = "root";
const DB_PASS = "root"; //OpenServer.
$connectionString = DB_DRIVER.':host='.DB_HOST.';dbname='.DB_NAME;
try
{
//Connect to database.
$db = new PDO($connectionString, DB_LOGIN, DB_PASS);
}
catch(PDOException $e)
{
die("Error: ".$e->getMessage());
}
$db->setAttribute(PDO::ATTR_ERRMODE, PDO::ERRMODE_EXCEPTION);
try
{
//Decreasing age for user 'nick1'.
$prep1 = $db->prepare("UPDATE tbl_users SET age=age-1 WHERE login='nick1'");
//Increasing age for user 'nick2'.
$prep2 = $db->prepare("UPDATE tbl_users SET \r\n age=age+1 WHERE login='nick2'");
//Start transaction.
$db->beginTransaction(); //Table type must be InnerDB!
//We assume that everything will be fine.
$flagDone = true;
//The exec() method returns the number of rows affected by the query.
//$prep1->queryString is already an escaped SQL string.
$result = $db->exec($prep1->queryString);
if($result==false || $result!=1) //var_dump($result) - int(1) or bool(false).
$flagDone = false;
$result = $db->exec($prep2->queryString);
if($result==false || $result!=1)
$flagDone = false;
if($flagDone)
{
if($db->commit())
echo "Transaction was successful";
}
else{
echo "Transaction fail";
$db->rollback();
}
echo "<br>";
}
catch(PDOException $e)
{
die("Error: ".$e->getMessage());
}