Question

$sql = "INSERT INTO myNotes ('id','date','notes') VALUES ('$id','$date','$notes')";

我想使用php将信息插入到mysql数据库中但同时我想检查日期和id是否已经存在然后更新注释

对于那些搜索解决方案的人我找到了

$sql = "SELECT notes FROM myNotes WHERE id='$id' AND  date='$date'";
$result = $conn->query($sql);
if ($result->num_rows > 0) {
while($row = $result->fetch_assoc()) {
   $sql = "UPDATE myNotes SET notes=$notes WHERE id='$id' AND date='$date'";
   if ($conn->query($sql)) {
       echo 'successfully updated';
 }
else {
   echo 'failed';}
   };}
else {
$sql = "INSERT INTO myNotes (id,date,notes) VALUES ('$id','$date','$note')";
 if ($conn->query($sql)) {
     echo 'added successfully';
 }
 else {
     echo 'failed to add';
 };}

Answer 1

您的查询应该是：

$sql = "INSERT INTO myNotes ('id','date','notes') VALUES ('$id','$date','$notes') ON DUPLICATE KEY UPDATE notes='updatednotes', date='updateddate'";

更新变量，如果它是重复的

1 个答案: