MySQL-从表中获取列名并显示它们（使用PHP）

Question

I want to take the column names from a table and display them, so i can compare them later. To get the names, i tried:

$entry = mysqli_query($con, 'SHOW COLUMNS FROM  table');

and

$entry = mysqli_query($con, "SELECT COLUMN_NAME FROM INFORMATION_SCHEMA.COLUMNS
WHERE TABLE_SCHEMA = '$db' AND TABLE_NAME = 'table'");

I don't know whether this runs correctly or not, since i don't get an error message there. If i try to print the contents of $entry via echo, i keep getting errors. Previously in my code, i print other entries using:

$test = mysqli_query($con, 'SELECT DISTINCT LK_Release FROM table');
while($row = mysqli_fetch_object($test))
{
echo "Releasename: " . "$row->LK_Release". "<br>";
... }

This output works for me. What i tried to output the columnnames:

while($row = mysqli_fetch_object($entry))
{
echo $row;
}

Any ideas?

Answer 1

The following SQL statements are nearly equivalent:

 SELECT COLUMN_NAME
 FROM INFORMATION_SCHEMA.COLUMNS
 WHERE table_name = 'tbl_name'

You can use DESCRIBE:

DESCRIBE my_table;

Or in newer versions you can use INFORMATION_SCHEMA:

SELECT COLUMN_NAME FROM INFORMATION_SCHEMA.COLUMNS WHERE TABLE_SCHEMA = 'my_database' AND    TABLE_NAME = 'my_table';

Or you can use SHOW COLUMNS:

SHOW COLUMNS FROM my_table;

Answer 2

Your query is already correct. But you lack something in the fetching:

while($row = mysqli_fetch_object($entry))
{
    echo $row->Field . '<br/>';
              // ^ access the objects properties
}