Fetch warning count from last operation

# BaseResult::getWarningsCount

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BaseResult::getWarningsCount — Fetch warning count from last operation

### Description

abstract public mysql_xdevapi\BaseResult::getWarningsCount(): int

Returns the number of warnings raised by the last operation. Specifically, these warnings are raised by the MySQL server.

### Parameters

This function has no parameters.

### Return Values

The number of warnings from the last operation.

### Examples

Example #1 mysql_xdevapi\RowResult::getWarningsCount() example

`<?php
$session = mysql_xdevapi\getSession("mysqlx://user:password@localhost");
$session->sql("DROP DATABASE IF EXISTS foo")->execute();
$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();
echo $res->getWarningsCount();
?>`

The above example will output something similar to:

    2

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