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我正在創建一個內容管理系統，以便數據庫可以輕鬆更新。我創建了一個更新頁面，允許用戶編輯數據庫中的條目，他們可以上傳新圖像並編輯任何字段，而不會有任何問題。 我遇到的問題是，如果您只想編輯一個字段中的文本，但您不想更改圖像，那麼在提交表單時會用空白條目覆蓋圖像字段。 我希望能夠做的是爲原始圖像保留，如果沒有其他文件被選中。 我知道我需要檢查一個文件是否被選中，但我似乎無法找到一種可行的方法。我敢肯定，這可能是一些簡單的，但這裏的腳本我有上傳：更新數據庫表單：當沒有選擇文件時，留下圖像字段爲空
$editFormAction = $_SERVER['PHP_SELF'];
if (isset($_SERVER['QUERY_STRING'])) {
/* upload image script */
$thumb=basename($_FILES['thumb']['name']);
if(move_uploaded_file($_FILES['thumb']['tmp_name'],"../shopImages/".$thumb))
$image1=basename($_FILES['image_1']['name']);
if(move_uploaded_file($_FILES['image_1']['tmp_name'],"../shopImages/".$image1))
$image2=basename($_FILES['image_2']['name']);
if(move_uploaded_file($_FILES['image_2']['tmp_name'],"../shopImages/".$image2))
/*end of script*/
$editFormAction .= "?" . htmlentities($_SERVER['QUERY_STRING']);
}
if ((isset($_POST["MM_update"])) && ($_POST["MM_update"] == "form1")) {
$updateSQL = sprintf("UPDATE tbl_products SET thumb=%s, image_1=%s, image_2=%s, title=%s, `desc`=%s, category_id=%s, status=%s, shipping_band=%s, price=%s WHERE product_id=%s",
GetSQLValueString($thumb, "text"),
GetSQLValueString($image1, "text"),
GetSQLValueString($image2, "text"),
GetSQLValueString($_POST['title'], "text"),
GetSQLValueString($_POST['desc'], "text"),
GetSQLValueString($_POST['category_id'], "int"),
GetSQLValueString($_POST['status'], "int"),
GetSQLValueString($_POST['shipping_band'], "text"),
GetSQLValueString($_POST['price'], "double"),
GetSQLValueString($_POST['product_id'], "int"));
這裏是表單代碼：
<form method="post" name="form1" action="<?php echo $editFormAction; ?>" enctype="multipart/form-data">
<table align="center">
<tr valign="baseline">
<td nowrap align="right">Product ID:</td>
<td>
<?php echo $row_RS_updateProducts['product_id']?>
</td>
<tr>
<tr valign="baseline">
<td nowrap align="right">Thumb:</td>
<td><?php echo $row_RS_updateProducts['thumb']?><input type="file" name="thumb" value="<?php echo $row_RS_updateProducts['thumb']?>" size="32"></td>
</tr>
<tr valign="baseline">
<td nowrap align="right">Image 1:</td>
<td><?php echo $row_RS_updateProducts['image_1']?><input type="file" name="image_1" value="<?php echo $row_RS_updateProducts['image_1']?>" size="32"></td>
</tr>
<tr valign="baseline">
<td nowrap align="right">Image 2:</td>
<td><?php echo $row_RS_updateProducts['image_2']?><input type="file" name="image_2" value="<?php echo $row_RS_updateProducts['image_2']?>" size="32"></td>
</tr>
<tr valign="baseline">
<td nowrap align="right">Title:</td>
<td><input type="text" name="title" value="<?php echo htmlentities($row_RS_updateProducts['title'], ENT_COMPAT, 'UTF-8'); ?>" size="32"></td>
</tr>
<tr valign="baseline">
<td nowrap align="right">Description:</td>
<td><input type="text" name="desc" value="<?php echo htmlentities($row_RS_updateProducts['desc'], ENT_COMPAT, 'UTF-8'); ?>" size="32"></td>
</tr>
<tr valign="baseline">
<td nowrap align="right">Category:</td>
<td><select name="category_id">
<?php
do {
?>
<option value="<?php echo $row_RS_Category['category_id']?>" <?php if (!(strcmp($row_RS_Category['category_id'], htmlentities($row_RS_updateProducts['category_id'], ENT_COMPAT, 'UTF-8')))) {echo "SELECTED";} ?>><?php echo $row_RS_Category['category_name']?></option>
<?php
} while ($row_RS_Category = mysql_fetch_assoc($RS_Category));
?>
</select></td>
<tr>
<tr valign="baseline">
<td nowrap align="right">Status:</td>
<td><select name="status">
<option value="1" <?php if (!(strcmp(1, htmlentities($row_RS_updateProducts['status'], ENT_COMPAT, 'UTF-8')))) {echo "SELECTED";} ?>>Available</option>
<option value="2" <?php if (!(strcmp(2, htmlentities($row_RS_updateProducts['status'], ENT_COMPAT, 'UTF-8')))) {echo "SELECTED";} ?>>Pending</option>
<option value="3" <?php if (!(strcmp(3, htmlentities($row_RS_updateProducts['status'], ENT_COMPAT, 'UTF-8')))) {echo "SELECTED";} ?>>Unavailable</option>
</select></td>
</tr>
<tr valign="baseline">
<td nowrap align="right">Shipping Band:</td>
<td><select name="shipping_band">
<option value="a" <?php if (!(strcmp("a", htmlentities($row_RS_updateProducts['shipping_band'], ENT_COMPAT, 'UTF-8')))) {echo "SELECTED";} ?>>A</option>
<option value="b" <?php if (!(strcmp("b", htmlentities($row_RS_updateProducts['shipping_band'], ENT_COMPAT, 'UTF-8')))) {echo "SELECTED";} ?>>B</option>
<option value="c" <?php if (!(strcmp("c", htmlentities($row_RS_updateProducts['shipping_band'], ENT_COMPAT, 'UTF-8')))) {echo "SELECTED";} ?>>C</option>
<option value="d" <?php if (!(strcmp("d", htmlentities($row_RS_updateProducts['shipping_band'], ENT_COMPAT, 'UTF-8')))) {echo "SELECTED";} ?>>D</option>
</select></td>
</tr>
<tr valign="baseline">
<td nowrap align="right">Price:</td>
<td><input type="text" name="price" value="<?php echo htmlentities($row_RS_updateProducts['price'], ENT_COMPAT, 'UTF-8'); ?>" size="32"></td>
</tr>
<tr valign="baseline">
<td nowrap align="right"> </td>
<td><input type="submit" value="Update record"></td>
</tr>
</table>
<input type="hidden" name="MM_update" value="form1">
<input type="hidden" name="product_id" value="<?php echo $row_RS_updateProducts['product_id']; ?>">
</form>
我是新的PHP所以任何幫助將不勝感激，因爲我一直堅持這個好幾天了。
任何人可以幫助我在這？我是新來的PHP和真的卡住它。我已經嘗試了評論中的所有建議，但似乎沒有任何工作。 – paul