[英]How to follow user id to get sum of MySQL column in PHP?
I have a column in a table that I want to follow "user id = 3" to get sum of MySQL column in PHP.我在表中有一个列,我想按照“user id = 3”获取 PHP 中 MySQL 列的总和。 but it's not working.但它不起作用。 Below is my code:下面是我的代码:
<?php
$sql_select_point = 'SELECT SUM(total_amount) FROM bp_roi WHERE user_id = ' . $user_id; // when I login, $user_id will store my user id number. Now my login user_id is 3.
$query_select_point = db_conn_select($sql_select_point);
foreach($query_select_point as $rs_select_point) {
$bonus_point = $rs_select_point; //I want to store and get sum of MySQL column in $bonus_point
}
?>
<div class="form-group">
<label for="recipient-name" class="col-form-label">Bonus Point Balance:<span style="color:red;"> *</span></label>
<div class="col-form-label">
<input class="form-group form-control" name="bonus_point" id="bonus_point" value="<?php echo $bonus_point; ?>" readonly></input> //I can't echo $bonus_point in the input.
</div>
</div>
The output show me like below the picuture and no show total sum up value: output 如下图所示,没有显示总和值:
Below is my database information, actually I want to select user_id = 3 and to total up "total_amount":下面是我的数据库信息,实际上我想要 select user_id = 3 并总计“total_amount”:
Lets add alias
to your column and get the column value based on index
.让我们为您的列添加alias
并根据index
获取列值。
<?php
$sql_select_point = 'SELECT SUM(total_amount) as tAmount FROM bp_roi WHERE user_id = ' . $user_id;
$query_select_point = db_conn_select($sql_select_point);
foreach($query_select_point as $rs_select_point) {
$bonus_point = $rs_select_point['tAmount'];
}
?>
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