Question

HTML

<form action="../php/get_uploaded_wall.php" method="POST" enctype="multipart/form-data">
<label for="desktop_dimension_id">Desktop dimensions:</label>
            <span class="checkbox">
                    <span class="checkbox_value">
                        <input id="dc1280_800" type="checkbox" name="1280x800"> 1280x800</span>
                        <input id="db1280_800" class="desktop_disabled" type="file" name="desktop_path_1280x800" size="100" />
                    <span class="checkbox_value">
                        <input id="dc1366_768" type="checkbox" name="1366x768"> 1366x768</span>
                        <input id="db1366_768" class="desktop_disabled" type="file" name="desktop_path_1366x768" size="100" />
            </span>

PHP

$connectDB = mysqli_connect(HOST, USERNAME, PASSWORD, DATABASENAME); 

//rename desktop walls & take out empty paths
        if(!empty($_FILES[$desktop_fieldname_1280x800]['name'])){
            file_exists($desktop_filename_1280x800 = strtolower($desktop_dir_1280x800 . 'wall_desktop_1280x800_' .
                                   $_FILES[$desktop_fieldname_1280x800]['name']));
        }   
        if(!empty($_FILES[$desktop_fieldname_1366x768]['name'])){
            file_exists($desktop_filename_1366x768 = strtolower($desktop_dir_1366x768 . 'wall_desktop_1366x768_' .
                                   $_FILES[$desktop_fieldname_1366x768]['name']));
        }

SQL

//insert into SQL code here
$insert_sql = "INSERT INTO walls(d_1280x800_path, d_1366x768_path) VALUES( '{$desktop_filename_1280x800}', '{$desktop_filename_1366x768}');";

//insert into database
    mysqli_query($connectDB, $insert_sql);

TABLES

以下是我的d_dimensions表格。

d_dimension_id    d_dimensions
1                 1280x800
2                 1366x768

和我的desktop_sizes表。

wall_id (P,F)    d_dimension_id (P,F)

我想做的是检查我的墙（未图示）表中是否上传了某个路径/ wallpapaper。因此，如果列d_1280x800_path包含我想将其存储在desktop_sizes表中的路径。例如，wall_id为21，而d_dimension_id的{{1}}为1280x800，1表将成为：

desktop_sizes

另外，如果wall_id (P,F) d_dimension_id (P,F) 21 1 wall_id=21的相同壁纸的1366x768表格大小为desktop_sizes，那么：

wall_id (P,F)    d_dimension_id (P,F)
    21               1
    21               2

总结一下，如果另一个表的列包含某个值，我想更新表。在我的情况下，根据wall和d_dimensions表中的值更新desktop_sizes表。我能清楚解释一下吗？我怎么能用上面给出的代码和表格来做到这一点？

如何检查列值是否存在？如果存在更新其他表中的值

0 个答案: