fleat: update product not delete all specifications

system/edit_product.php

@@ -182,6 +182,7 @@ $category_id = $row['category_id'] ? intval($row['category_id']) : 0;
                                     <span class="delspecitem">-</span>
                                     
                                     <!-- 隐藏字段，保留原始数据 -->
+                                    <input type="hidden" name="spec_id[]" value="<?php echo $spec_row['id']; ?>">
                                     <input type="hidden" name="spec_value[]" value="<?php echo htmlspecialcharsFix($spec_row['spec_value']); ?>">
                                     <input type="hidden" name="spec_code[]" value="<?php echo htmlspecialcharsFix($spec_row['spec_code']); ?>">
                                     <input type="hidden" name="spec_sort[]" value="<?php echo $spec_row['sort_order']; ?>">
@@ -205,6 +206,7 @@ $category_id = $row['category_id'] ? intval($row['category_id']) : 0;
                                 <span class="delspecitem">-</span>
                                 
                                 <!-- 隐藏字段，仍然提交但不显示 -->
+                                <input type="hidden" name="spec_id[]" value="0">
                                 <input type="hidden" name="spec_value[]" value="">
                                 <input type="hidden" name="spec_code[]" value="">
                                 <input type="hidden" name="spec_sort[]" value="0">
@@ -266,6 +268,7 @@ $category_id = $row['category_id'] ? intval($row['category_id']) : 0;
             newSpecItem.find('input[type="text"], input[type="hidden"]').val(''); // Clear values
             newSpecItem.find('input[name="spec_moq[]"]').val('1'); // Reset MOQ to 1
             newSpecItem.find('input[name="spec_sort[]"]').val('0'); // Reset sort to 0
+            newSpecItem.find('input[name="spec_id[]"]').val('0'); // Set ID to 0 for new specs
             $(this).closest('.specifications').append(newSpecItem);
         });
         

system/save_product.php

@@ -24,6 +24,7 @@ $spec_price = isset($_POST['spec_price']) ? $_POST['spec_price'] : array();
 $spec_moq = isset($_POST['spec_moq']) ? $_POST['spec_moq'] : array();
 $spec_code = isset($_POST['spec_code']) ? $_POST['spec_code'] : array();
 $spec_sort = isset($_POST['spec_sort']) ? $_POST['spec_sort'] : array();
+$spec_id = isset($_POST['spec_id']) ? $_POST['spec_id'] : array();
 
 // Redirect URL
 $redirect_url = "products.php?Keys=" . $keys . "&Page=" . $page;
@@ -81,10 +82,10 @@ if ($is_edit) {
             WHERE id = " . (int)$id;
     mysqli_query($conn, $sql);
     
-    // Clear existing specifications for this product
-    mysqli_query($conn, "DELETE FROM product_specifications WHERE product_id = " . (int)$id);
+    // Track which specification IDs we're keeping in this update
+    $kept_spec_ids = array();
     
-    // Add new specifications
+    // Process specifications
     if (is_array($spec_name) && !empty($spec_name)) {
         foreach ($spec_name as $key => $name) {
             if (!empty($name) && isset($spec_price[$key]) && !empty($spec_price[$key])) {
@@ -93,23 +94,56 @@ if ($is_edit) {
                 $spec_code_value = isset($spec_code[$key]) ? mysqli_real_escape_string($conn, $spec_code[$key]) : '';
                 $spec_sort_value = isset($spec_sort[$key]) && is_numeric($spec_sort[$key]) ? (int)$spec_sort[$key] : 0;
                 $spec_value_value = isset($spec_value[$key]) ? mysqli_real_escape_string($conn, $spec_value[$key]) : '';
+                $spec_id_value = isset($spec_id[$key]) && is_numeric($spec_id[$key]) ? (int)$spec_id[$key] : 0;
                 
-                $sql = "INSERT INTO product_specifications 
-                        (product_id, spec_name, spec_value, price, min_order_quantity, spec_code, addtime, sort_order) 
-                        VALUES (
-                            " . (int)$id . ", 
-                            '" . mysqli_real_escape_string($conn, $name) . "', 
-                            '" . $spec_value_value . "', 
-                            " . $spec_price_value . ", 
-                            " . $spec_moq_value . ", 
-                            '" . $spec_code_value . "', 
-                            NOW(), 
-                            " . $spec_sort_value . "
-                        )";
-                mysqli_query($conn, $sql);
+                if ($spec_id_value > 0) {
+                    // Update existing specification
+                    $sql = "UPDATE product_specifications SET 
+                            spec_name = '" . mysqli_real_escape_string($conn, $name) . "', 
+                            spec_value = '" . $spec_value_value . "', 
+                            price = " . $spec_price_value . ", 
+                            min_order_quantity = " . $spec_moq_value . ", 
+                            spec_code = '" . $spec_code_value . "', 
+                            sort_order = " . $spec_sort_value . "
+                            WHERE id = " . $spec_id_value . " AND product_id = " . (int)$id;
+                    mysqli_query($conn, $sql);
+                    
+                    // Add to kept IDs list
+                    $kept_spec_ids[] = $spec_id_value;
+                } else {
+                    // Insert new specification
+                    $sql = "INSERT INTO product_specifications 
+                            (product_id, spec_name, spec_value, price, min_order_quantity, spec_code, addtime, sort_order) 
+                            VALUES (
+                                " . (int)$id . ", 
+                                '" . mysqli_real_escape_string($conn, $name) . "', 
+                                '" . $spec_value_value . "', 
+                                " . $spec_price_value . ", 
+                                " . $spec_moq_value . ", 
+                                '" . $spec_code_value . "', 
+                                NOW(), 
+                                " . $spec_sort_value . "
+                            )";
+                    mysqli_query($conn, $sql);
+                    
+                    // Add newly inserted ID to kept list
+                    $kept_spec_ids[] = mysqli_insert_id($conn);
+                }
             }
         }
     }
+    
+    // Delete specifications that were removed in the form
+    if (!empty($kept_spec_ids)) {
+        $delete_sql = "DELETE FROM product_specifications WHERE product_id = " . (int)$id;
+        if (count($kept_spec_ids) > 0) {
+            $delete_sql .= " AND id NOT IN (" . implode(',', $kept_spec_ids) . ")";
+        }
+        mysqli_query($conn, $delete_sql);
+    } else {
+        // If no specifications are kept, delete all specifications for this product
+        mysqli_query($conn, "DELETE FROM product_specifications WHERE product_id = " . (int)$id);
+    }
 } else {
     // Insert new product
     $sql = "INSERT INTO products (ProductName, ProductImg, Addtime, moq, unit, nosale, note, tips, category_id)