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RowResult::getColumnNames — Get all column names
Retrieve column names for columns present in the result set.
本函数还未编写文档，仅有参数列表。
此函数没有参数。
A numerical array of table columns names, or an empty array if the result set is empty.
Example #1 mysql_xdevapi\RowResult::getColumnNames() example
<?php
$session = mysql_xdevapi\getSession("mysqlx://user:password@localhost");
$session->sql("DROP DATABASE addressbook")->execute();
$session->sql("CREATE DATABASE foo")->execute();
$session->sql("CREATE TABLE foo.test_table(x int)")->execute();
$session->sql("INSERT INTO addressbook.names values ('John', 42), ('Sam', 33)")->execute();
$sql = $session->sql("SELECT * from addressbook.names")->execute();
$colnames = $sql->getColumnNames();
print_r($colnames);
以上例程的输出类似于：
Array
(
[0] => name
[1] => age
)