Get all column names

# RowResult::getColumnNames

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RowResult::getColumnNames — Get all column names

### 说明

public function mysql_xdevapi\RowResult::getColumnNames(): array

Retrieve column names for columns present in the result set.

警告

本函数还未编写文档，仅有参数列表。

### 参数

此函数没有参数。

### 返回值

A numerical array of table columns names, or an empty array if the result set is empty.

### 示例

示例 #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);

以上示例的输出类似于：

    Array
    (
        [0] => name
        [1] => age
    )

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