[英]Select query joining two tables PHP
我將一個腳本放在一起,該腳本將打印“ sales_list ”表中的所有行,但僅打印那些與已登錄用戶匹配的“ users_sales_guild_id ”行。 這很好。
我要執行的操作是打印所有行,但從“ accessories_orders”表中檢索匹配的sales_id ,並將“ accessories_orders_total”和出廠狀態與查詢一起放入,因此如果以下內容在瀏覽器中看起來像這樣:登錄的人的“ user_sales_guild_id”值為“ 1234” 。
+--------+---------------+-------------------+----------+
| Model | Customer Name | Accessories Total | Status |
+--------+---------------+-------------------+----------+
| Nissan | Malcom Smith | | Add |
| Ford | Jane Smith | 200.00 | Pending |
+------------------------+-------------------+----------+
因此,如果“ accessories_orders”表中有匹配的行,則它將打印“ shipped”和“ accessories_orders_total”數據。 如果沒有與此匹配的行,那么它將顯示一個“ Add”鏈接,該鏈接指向add_accessories_sales.php。
我收到一條錯誤消息“未定義的索引:sales_model”,並且在第一個查詢中還有幾乎所有其他內容,有人可以指出我要去哪里了嗎?
“ sales_list”表
+--------------------------------------------------------------------------------------------------------------------------+
| sales_list |
+------+--------------------------+--------------------------+------------------------+-------------+----------------------+
| sales_id | users_sales_guild_id | sales_customer_firstname | sales_customer_surname | sales_model | sales_entry_date |
+----------+----------------------+--------------------------+------------------------+-------------+----------------------+
| 1 | 1234 | Jane | Smith | Ford | 2013-12-02 12:00:00 |
| 2 | 5678 | John | Chan | Mazda | 2013-12-03 12:00:00 |
| 3 | 5678 | Kevin | Chan | Fiat | 2013-12-04 12:00:00 |
| 4 | 1234 | Malcom | Smith | Nissan | 2013-12-05 12:00:00 |
+----------+----------------------+--------------------------+------------------------+-------------+----------------------+
“ accessories_orders”表
+-------------------------------------------------------------------------------------------------------------------------+
| accessories_orders |
+-----------------------+----------------------+----------+--------------------------+-------------------------+----------+
| accessories_orders_id | users_sales_guild_id | sales_id | accessories_orders_total | accessories_orders_date | shipped |
+-----------------------+----------------------+----------+--------------------------+-------------------------+----------+
| 1 | 1234 | 1 | 200.00 | 2013-12-02 12:00:00 | Pending |
| 2 | 5678 | 2 | 350.00 | 2013-12-03 12:00:00 | Pending |
| 3 | 5678 | 3 | 100.00 | 2013-12-03 12:00:00 | Pending |
+-----------------------+----------------------+----------+--------------------------+-------------------------+----------+
編輯和更新的代碼
<?php
require_once ('database.php'); // Connect to the database.
$query = " SELECT sl.sales_model, sl.sales_customer_firstname, sl.sales_customer_surname, ao.accessories_orders_total, ao.shipped,
COALESCE(ao.shipped)
FROM sales_list sl
LEFT JOIN accessories_orders ao ON(ao.sales_id = sl.sales_id)
WHERE sl.users_sales_guild_id ='".$_SESSION['users_sales_guild_id']."'
ORDER BY
".$order_by." LIMIT ".$start.", ".$display;
$result = @mysql_query ($query); // Run the query.
echo '<table width="610" cellspacing="1" cellpadding="5" style="font-size:11px;">
<tr>
<td align="center">Model </td>
<td align="center">Customer Name</td>
<td align="center">Accessories Total</td>
<td align="center">Status</td></tr>';
$bg = '#ffffff'; // Set the background color.
while ($row = mysql_fetch_array($result, MYSQL_ASSOC)) {
$status = $row['shipped'];
$bg = ($bg=='#e1e3e6' ? '#cdcdcf' : '#e1e3e6'); // Switch the background color.
echo '<tr bgcolor="' . $bg . '">';
echo '<td align="center">' . $row['sl.sales_model'] . '</td>';
echo '<td align="center">' . $row['sl.sales_customer_firstname'] . ' ' . $row['sl.sales_customer_surname'] . '</td>';
echo '<td align="center">$' . $row['acc.accessories_orders_total'] . '</td>';
$str = '<td align="center">';
if($status == 'Pending') {
$str .=' Pending</td></tr>';
}
else {
$str .='<strong><a href="add_accessories_sales.php?sid=' . $row['sl.sales_id'] . '">Add</a></strong></td></tr>';
}
echo $str;
}
echo '</table>';
mysql_free_result ($result); // Free up the resources.
mysql_close(); //Close the database connection.
?>
您的查詢需要更像這樣:
SELECT sl.sales_model, sl.sales_customer_firstname, sl.sales_customer_surname, ao.accessories_orders_total, COALESCE(ao.shipped, 'Add') status
FROM sales_list sl
LEFT JOIN accessories_orders ao ON(ao.sales_id = sl.sales_id)
WHERE sl.users_sales_guild_id = 1234;
LEFT JOIN
是這里的關鍵。 它允許行從數據返回sales_list
即使在沒有相應的條目accessories_orders
。
有關工作示例,請參見此提琴: http : //sqlfiddle.com/#!2/f7d3d/4
正如其他人已經指出的那樣,您應該使用mysqli
函數集,而不是mysql
函數集。
首先,您不應該包括表名。 例:
//wrong
echo '<td align="center">' . $row['sl.sales_model'] . '</td>';
//correct
echo '<td align="center">' . $row['sales_model'] . '</td>';
其次,除非使用的是過時的PHP版本,否則不應使用mysql
。 切換到mysqli
或PDO
。
第三,您沒有錯誤處理可以告訴您查詢是否成功。 實際上,您與錯誤處理相反,因為您試圖使用@
運算符來抑制錯誤。 相反,您應該執行以下操作:
//assuming you switch to mysqli
mysqli_query("SELECT acc.accessories_orders_id, acc.users_id, acc.sales_id,
acc.accessories_orders_total, acc.accessories_orders_date, acc.shipped,
acc.timestamp, sl.sales_id
FROM accessories_orders AS acc, sales_list AS sl
WHERE acc.sales_id = sl.sales_id");
if(mysqli_error()) {
throw new Exception(mysqli_error(), mysqli_errno());
}
如果這樣做,您的mysql錯誤將與php錯誤記錄在同一位置。 然后,您將能夠判斷出您的問題是否來自格式錯誤的查詢。
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