ClickHouse/docs/zh/sql-reference/table-functions/url.md
2021-03-19 10:33:52 +08:00

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---
toc_priority: 41
toc_title: url
---
# url {#url}
`url` 函数从 `URL` 创建一个具有给定 `format``structure` 的表。
`url` 函数可用于对[URL](../../engines/table-engines/special/url.md)表中的数据进行 `SELECT``INSERT` 的查询中。
**语法**
``` sql
url(URL, format, structure)
```
**参数**
- `URL` — HTTP或HTTPS服务器地址它可以接受 `GET` 或 `POST` 请求 (对应于 `SELECT` 或 `INSERT` 查询)。类型: [String](../../sql-reference/data-types/string.md)。
- `format` — 数据[格式](../../interfaces/formats.md#formats)。类型: [String](../../sql-reference/data-types/string.md)。
- `structure` — 以 `'UserID UInt64, Name String'` 格式的表结构。确定列名和类型。 类型: [String](../../sql-reference/data-types/string.md)。
**返回值**
A table with the specified format and structure and with data from the defined `URL`.
**示例**
获取一个表的前3行该表是从HTTP服务器获取的包含 `String` 和 [UInt32](../../sql-reference/data-types/int-uint.md) 类型的列,以[CSV](../../interfaces/formats.md#csv)格式返回。
``` sql
SELECT * FROM url('http://127.0.0.1:12345/', CSV, 'column1 String, column2 UInt32') LIMIT 3;
```
`URL` 的数据插入到表中:
``` sql
CREATE TABLE test_table (column1 String, column2 UInt32) ENGINE=Memory;
INSERT INTO FUNCTION url('http://127.0.0.1:8123/?query=INSERT+INTO+test_table+FORMAT+CSV', 'CSV', 'column1 String, column2 UInt32') VALUES ('http interface', 42);
SELECT * FROM test_table;
```
[原始文章](https://clickhouse.tech/docs/en/query_language/table_functions/url/) <!--hide-->