以修改后的格式将数据从SQL导出到CSV

Question

Suppose I have a table in SQL named 'myTable'. It contains 3 columns; 'id', 'lat' and 'lng'

|  id  |  lat   |  lng   |
|------+--------+--------|
|  1   |  1.11  |  1.22  |
|  2   |  2.11  |  2.22  |
|  3   |  3.11  |  3.22  |
|  4   |  4.11  |  4.22  |
| .... |  ....  |  ....  |

I want to export it to CSV. I expect the result become like this in the CSV file :

|     |  A   |  B   |   C   |   D  |  ....
------+-----+------+--------+------+--------
|  1  | 1.11 | 2.11 | 3.11  | 4.11 |  ....      //contains 'lat'
|  2  | 1.22 | 2.22 | 3.22  | 4.22 |  ....      //contains 'lng'

Can you help me? I'm using PHP. Thanks a lot.

Answer 1

This might actually be something which would be best handled in your PHP script, rather than in MySQL. Assuming your are using mysqli , you could try something like this:

$sql = "SELECT id, lat, lng FROM yourTable ORDER BY id";
$result = $conn->query($sql);

$row1 = NULL;
$row2 = NULL;

if ($result->num_rows > 0) {
    while ($row = $result->fetch_assoc()) {
        if ($row1 != NULL) {
            $row1 .= ",";
            $row2 .= ",";
        }
        $row1 .= $row["lat"];
        $row2 .= $row["lng"];
    }
}

At the end of the loop in the above script, $row1 and $row2 should contain the first two rows of the output file you expect. The only steps missing might be the header, if you want that, and also the details of how to write a string to a text file.