Get warnings from last operation

# RowResult::getWarnings

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RowResult::getWarnings — Get warnings from last operation

### 说明

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

Retrieve warnings from the last RowResult operation.

### 参数

此函数没有参数。

### 返回值

An array of Warning objects from the last operation. Each object defines an error 'message', error 'level', and error 'code'. An empty array is returned if no errors are present.

### 示例

示例 #1 mysql_xdevapi\RowResult::getWarnings() example

    <?php
    $session = mysql_xdevapi\getSession("mysqlx://user:password@localhost");

    $session->sql("CREATE DATABASE foo")->execute();
    $session->sql("CREATE TABLE foo.test_table(x int)")->execute();

    $schema = $session->getSchema("foo");
    $table  = $schema->getTable("test_table");

    $table->insert(['x'])->values([1])->values([2])->execute();

    $res = $table->select(['x/0 as bad_x'])->execute();
    $warnings = $res->getWarnings();

    print_r($warnings);
    ?>

以上示例的输出类似于：

    Array
    (
        [0] => mysql_xdevapi\Warning Object
            (
                [message] => Division by 0
                [level] => 2
                [code] => 1365
            )
        [1] => mysql_xdevapi\Warning Object
            (
                [message] => Division by 0
                [level] => 2
                [code] => 1365
            )
    )

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