# RowResult::getColumns

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RowResult::getColumns — Get column metadata

### 说明

public mysql_xdevapi\RowResult::getColumns(): array

Retrieve column metadata 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

An array of FieldMetadata objects representing the columns in the result, or an empty array if the result set is empty.

### 示例

示例 #1 mysql_xdevapi\RowResult::getColumns() 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();
$cols = $sql->getColumns();
print_r($cols);`

以上示例的输出类似于：

    Array
    (
        [0] => mysql_xdevapi\FieldMetadata Object
            (
                [type] => 7
                [type_name] => BYTES
                [name] => name
                [original_name] => name
                [table] => names
                [original_table] => names
                [schema] => addressbook
                [catalog] => def
                [collation] => 255
                [fractional_digits] => 0
                [length] => 65535
                [flags] => 0
                [content_type] => 0
            )
        [1] => mysql_xdevapi\FieldMetadata Object
            (
                [type] => 1
                [type_name] => SINT
                [name] => age
                [original_name] => age
                [table] => names
                [original_table] => names
                [schema] => addressbook
                [catalog] => def
                [collation] => 0
                [fractional_digits] => 0
                [length] => 11
                [flags] => 0
                [content_type] => 0
            )
    )

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