[英]How to retrieve multiple values from MySQL with app inventor + PHP?
[英]PHP export MySQL to csv for app inventor
當我嘗試將MySQL表導出到csv(使用php)並將其作為app inventor中的列表時,但未顯示該列表。
我的街區:
我的php文件:
if ($result = mysqli_query($dbc, "SHOW COLOMNS FROM Absent")){
$numberOfRows = mysqli_num_rows($result);
}
if($numberOfRows > 0) {
$values = mysqli_query($dbc, "SELECT full_name FROM Absent");
while($rowr = mysqli_fetch_row($values)){
for($j=0; $j<$numberOfRows; $j++) {
$csv_output .=$rowr [$j]. " ,";
}
$csv_output .= "\n";
}
}
print $csv_output;
exit;
嘗試使用mysql本機方法導出到csv,例如:
SELECT id, name, email INTO OUTFILE '/tmp/result.csv'
FIELDS TERMINATED BY ',' OPTIONALLY ENCLOSED BY '"'
ESCAPED BY ‘\\’
LINES TERMINATED BY '\n'
FROM users WHERE 1
我對app-inventor不太了解,但是對於sql查詢:
第一個表是“ CUSTOMER”,第二個表是:“ Absent”,是錯字嗎? (您用從“客戶”獲得的列數來迭代“缺席”行,這是您的意圖嗎?)
您的“ $ rowr”變量只有1列(“ full_name”),因此您可以輕松地:將“ for循環”拖放到:
$ csv_output。= $ rowr [0];
PS在php中編碼的另一種方式是:
$result = mysqli_query($dbc, "SELECT column1, column2, column3 FROM Absent");
while ($row = mysqli_fetch_assoc($result))
{
$comma = "";
foreach( $row as $key=>$value )
{
$csv_output .= $comma . $value;
$comma = ", ";
}
$csv_output .= "\n";
}
print $csv_output;
exit;
聲明:本站的技術帖子網頁,遵循CC BY-SA 4.0協議,如果您需要轉載,請注明本站網址或者原文地址。任何問題請咨詢:yoyou2525@163.com.