我可以根据会话 ID 为特定用户从数据库中添加和删除我想要的数据,但是,当我尝试更新该特定用户的数据时,出现错误。那个重复的键语句也不能正常工作,因为键被设置为记录 ID 与股票代码。任何想法如何解决这个问题,因为现在当一个人尝试添加相同的股票两次时,他们被允许这样做,所以这会导致以后出现问题。对于更新部分,我不确定我现在是否以正确的方式使用更新语句来解决这个问题,所以我很感激任何反馈/帮助。谢谢!
插入和更新代码:
// When the Buy button is pressed, specific action will be triggered according to the input given.
if(isset($_POST['Buy']))
{
// Checking whether first line is completely filled.
if(empty($_POST['sym1']) or empty($_POST['pri1']) or empty($_POST['q1']))
{
?><h2><center>To add values, please fill out at least the first row completely.</center></h2><?php
// die();
}
// Loop through the form to allow for an appropriate db update.
for($x=1;$x<=4;$x++)
{
$sym = [];
$pri = [];
$q = [];
// If input provided is correct then update the db.
if (!empty($_POST['sym'.$x]) and !empty($_POST['pri'.$x]) and !empty($_POST['q'.$x]))
{
$sym[$x] = $_POST['sym'.$x];
$pri[$x] = $_POST['pri'.$x];
$q[$x] = $_POST['q'.$x];
$memberid = $_SESSION['memberID'];
$sql = "INSERT INTO portfolio2
(stocks_symbol, price, quantity, memberID)
VALUES ('$sym[$x]', $pri[$x], $q[$x], $memberid)
ON DUPLICATE KEY UPDATE
price=$pri[$x], quantity=$q[$x]";
// Check if values are added successfully and if so, then display a message to the user.
if(mysqli_query($conn, $sql))
{
?><h2><center><?php
echo "Stocks added successfully!";
?></h2><center><?php
}
else
{
?><h2><center><?php
echo "Error- Stocks weren't added!". "<br>". $sql.
"<br>". $conn->error;
?></h2><center><?php
}
}
}
mysqli_close($conn);
}
// UPDATE
elseif(isset($_POST['Update']))
{
// Check to see whether the stock symbol has been provided
if(empty($_POST['sym1']))
{
?><h2><center>To update values, please enter the symbol of the stock to be updated.</center></h2><?php
// die();
}
// Loop through the form to allow for an appropriate db update.
for($x=1;$x<=4;$x++)
{
$sym = [];
$pri = [];
$q = [];
// When all three values to be updated are given and are correct, update the db accordingly.
if (!empty($_POST['sym'.$x]) and !empty($_POST['pri'.$x]) and !empty($_POST['q'.$x]))
{
$sym[$x] = $_POST['sym'.$x];
$pri[$x] = $_POST['pri'.$x];
$q[$x] = $_POST['q'.$x];
$memberid = $_SESSION['memberID'];
$sql = "UPDATE portfolio2 SET price=$pri[$x] and quantity=$q[$x] WHERE stocks_symbol='$sym[$x]' and memberid=$memberid";
// Check to see whether the values are updated successfully and if so, then display a message to the user.
if(mysqli_query($conn, $sql))
{
?><h2><center><?php
echo "Stocks updated successfully!";
?></h2><center><?php
}
else
{
?><h2><center><?php
echo "Error- Couldn't update stocks from the table". "<br>". $sql.
"<br>". $conn->error;
?></h2><center><?php
}
}
}
mysqli_close($conn);
}
表结构:portfolio2
CREATE TABLE `portfolio2` (
`stockID` int(11) NOT NULL AUTO_INCREMENT,
`stocks_symbol` varchar(30) NOT NULL,
`price` decimal(30,2) DEFAULT NULL,
`quantity` int(30) DEFAULT NULL,
`memberid` int(11) NOT NULL,
PRIMARY KEY (`stockID`)
) ENGINE=InnoDB AUTO_INCREMENT=10 DEFAULT CHARSET=latin1
如果要防止用户两次添加同一只股票,可以通过创建UNIQUE
索引来实现:
ALTER TABLE `portfolio2` ADD UNIQUE `unique_idx`(`memberid`, `stocks_symbol`);
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