ClickHouse/docs/tr/sql-reference/table-functions/hdfs.md
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---
machine_translated: true
machine_translated_rev: 72537a2d527c63c07aa5d2361a8829f3895cf2bd
toc_priority: 45
toc_title: hdf'ler
---
# hdf'ler {#hdfs}
Hdfs'deki dosyalardan bir tablo oluşturur. Bu tablo işlevi benzer [url](url.md) ve [Dosya](file.md) biri.
``` sql
hdfs(URI, format, structure)
```
**Giriş parametreleri**
- `URI` — The relative URI to the file in HDFS. Path to file support following globs in readonly mode: `*`, `?`, `{abc,def}` ve `{N..M}` nerede `N`, `M` — numbers, \``'abc', 'def'` — strings.
- `format` — The [biçimli](../../interfaces/formats.md#formats) dosya.
- `structure` — Structure of the table. Format `'column1_name column1_type, column2_name column2_type, ...'`.
**Döndürülen değer**
Belirtilen dosyada veri okumak veya yazmak için belirtilen yapıya sahip bir tablo.
**Örnek**
Tablo fromdan `hdfs://hdfs1:9000/test` ve ondan ilk iki satır seçimi:
``` sql
SELECT *
FROM hdfs('hdfs://hdfs1:9000/test', 'TSV', 'column1 UInt32, column2 UInt32, column3 UInt32')
LIMIT 2
```
``` text
┌─column1─┬─column2─┬─column3─┐
│ 1 │ 2 │ 3 │
│ 3 │ 2 │ 1 │
└─────────┴─────────┴─────────┘
```
**Yolda Globs**
Birden çok yol bileşenleri globs olabilir. İşlenmek için dosya var olmalı ve tüm yol deseniyle eşleşmelidir (sadece sonek veya önek değil).
- `*` — Substitutes any number of any characters except `/` boş dize dahil.
- `?` — Substitutes any single character.
- `{some_string,another_string,yet_another_one}` — Substitutes any of strings `'some_string', 'another_string', 'yet_another_one'`.
- `{N..M}` — Substitutes any number in range from N to M including both borders.
İle yapılar `{}` benzer olan [uzaktan masa fonksiyonu](../../sql-reference/table-functions/remote.md)).
**Örnek**
1. HDFS'DE aşağıdaki Urı'lere sahip birkaç dosyamız olduğunu varsayalım:
- hdfs://hdfs1:9000/some\_dir/some\_file\_1
- hdfs://hdfs1:9000/some\_dir/some\_file\_2
- hdfs://hdfs1:9000/some\_dir/some\_file\_3
- hdfs://hdfs1:9000/another\_dir/some\_file\_1
- hdfs://hdfs1:9000/another\_dir/some\_file\_2
- hdfs://hdfs1:9000/another\_dir/some\_file\_3
1. Bu dosyalardaki satır miktarını sorgula:
<!-- -->
``` sql
SELECT count(*)
FROM hdfs('hdfs://hdfs1:9000/{some,another}_dir/some_file_{1..3}', 'TSV', 'name String, value UInt32')
```
1. Bu iki dizinin tüm dosyalarındaki satır miktarını sorgula:
<!-- -->
``` sql
SELECT count(*)
FROM hdfs('hdfs://hdfs1:9000/{some,another}_dir/*', 'TSV', 'name String, value UInt32')
```
!!! warning "Uyarıcı"
Dosya listenizde önde gelen sıfırlar içeren sayı aralıkları varsa, her basamak için parantez içeren yapıyı ayrı ayrı kullanın veya kullanın `?`.
**Örnek**
Adlı dosy thealardan verileri sorgu thelamak `file000`, `file001`, … , `file999`:
``` sql
SELECT count(*)
FROM hdfs('hdfs://hdfs1:9000/big_dir/file{0..9}{0..9}{0..9}', 'CSV', 'name String, value UInt32')
```
## Sanal Sütunlar {#virtual-columns}
- `_path` — Path to the file.
- `_file` — Name of the file.
**Ayrıca Bakınız**
- [Sanal sütunlar](https://clickhouse.tech/docs/en/operations/table_engines/#table_engines-virtual_columns)
[Orijinal makale](https://clickhouse.tech/docs/en/query_language/table_functions/hdfs/) <!--hide-->