Android ArrayIndexOutOfBounds向mysql插入行时出现异常

我在向mysql表中插入行时出错。

这些记录来自我的本地sqlitedb。我目前有两条记录，希望将它们插入到mysqldb中。

以下是我正在处理的代码：

    String[] arrDocumentNumber, arrTransactionDate, arrItemCode;
    arrDocumentNumber = dbHelper.getAllDocumentNumbersFromOUTTRANS();
    arrTransactionDate = dbHelper.getAllTransactionDatesFromOUTTRANS();
    arrItemCode = dbHelper.getAllItemCodesFromOUTTRANS();
    protected String doInBackground(String... args) {
        // Building Parameters
        List<NameValuePair> params = new ArrayList<NameValuePair>();
        for(int i = 0; i <= arrDocumentNumber.length; i++){
            params.add(new BasicNameValuePair(TAG_DOCUMENTNUMBER, arrDocumentNumber[i] ));
            params.add(new BasicNameValuePair(TAG_TRANSACTIONDATE, arrTransactionDate[i] ));
            params.add(new BasicNameValuePair(TAG_ITEMCODE, arrItemCode[i] )); 
        }
        // getting JSON Object
        // Note that insert outtrans url accepts POST method
        JSONObject json = jsonParser.makeHttpRequest(url_insertTo_outtrans,
                "POST", params);
 }

PHP:

 <?php
// array for JSON response
$response = array();
// check for required fields
if ( isset($_POST['documentnumber']) && isset($_POST['transactiondate']) && isset($_POST['itemcode']) ){
    $documentnumber = $_POST['documentnumber'];
    $transactiondate = $_POST['transactiondate'];
    $itemcode = $_POST['itemcode'];
    // include db connect class
    include('dbconnect.php');
    $result = $conn->prepare("INSERT INTO outtrans(documentnumber, transactiondate, itemcode) VALUES (:documentnumber, :transactiondate, :itemcode)");
    $result->bindParam(':documentnumber', $documentnumber);
    $result->bindParam(':transactiondate', $transactiondate);
    $result->bindParam(':itemcode', $itemcode);
    $result->execute();

    // check if row inserted or not
    if ($result) {
        // successfully inserted into database
        $response["success"] = 1;
        $response["message"] = "New record successfully created.";
        // echoing JSON response
        echo json_encode($response);
    } else {
        // failed to insert row
        $response["success"] = 0;
        $response["message"] = "Oops! An error occurred.";
        // echoing JSON response
        echo json_encode($response);
    }
} else {
    // required field is missing
    $response["success"] = 0;
    $response["message"] = "Required field(s) is missing";
    // echoing JSON response
    echo json_encode($response);
}
?>

我在这行遇到错误：

   params.add(new BasicNameValuePair(TAG_DOCUMENTNUMBER, arrDocumentNumber[i] ));

有什么想法吗？我真的陷入了这个问题。我们非常感谢您的帮助。谢谢

更新：我换了

   for(int i = 0; i < arrDocumentNumber.length; i++){

它是有效的，但最后一条记录只保存到远程mysqldb中。它应该保存我从本地sqlite数据库中获得的两条记录。