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22
docs/en/operations/named-collections.md
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@ -307,8 +307,22 @@ SELECT dictGet('dict', 'B', 2);
## Named collections for accessing PostgreSQL database
The description of parameters see [postgresql](../sql-reference/table-functions/postgresql.md).
The description of parameters see [postgresql](../sql-reference/table-functions/postgresql.md). Additionally, there are aliases:
- `username` for `user`
- `db` for `database`.
Parameter `addresses_expr` is used in a collection instead of `host:port`. The parameter is optional, because there are other optional ones: `host`, `hostname`, `port`. The following pseudocode explains the priority:
```sql
CASE
WHEN collection['addresses_expr'] != '' THEN collection['addresses_expr']
WHEN collection['host'] != '' THEN collection['host'] || ':' || if(collection['port'] != '', collection['port'], '5432')
WHEN collection['hostname'] != '' THEN collection['hostname'] || ':' || if(collection['port'] != '', collection['port'], '5432')
END
```
Example of creation:
```sql
CREATE NAMED COLLECTION mypg AS
user = 'pguser',
@ -316,7 +330,7 @@ password = 'jw8s0F4',
host = '127.0.0.1',
port = 5432,
database = 'test',
schema = 'test_schema',
schema = 'test_schema'
```
Example of configuration:
@ -369,6 +383,10 @@ SELECT * FROM mypgtable;
└───┘
```
:::note
PostgreSQL copies data from the named collection when the table is being created. A change in the collection does not affect the existing tables.
:::
### Example of using named collections with database with engine PostgreSQL
```sql

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docs/ru/operations/named-collections.md
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@ -146,7 +146,30 @@ SELECT dictGet('dict', 'B', 2);
## Пример использования именованных соединений с базой данных PostgreSQL
Описание параметров смотрите [postgresql](../sql-reference/table-functions/postgresql.md).
Описание параметров смотрите [postgresql](../sql-reference/table-functions/postgresql.md). Дополнительно есть алиасы:
- `username` для `user`
- `db` для `database`.
Параметр `addresses_expr` используется в коллекции вместо `host:port`. Параметр опционален, потому что есть так же другие: `host`, `hostname`, `port`. Следующий псевдокод показывает приоритет:
```sql
CASE
WHEN collection['addresses_expr'] != '' THEN collection['addresses_expr']
WHEN collection['host'] != '' THEN collection['host'] || ':' || if(collection['port'] != '', collection['port'], '5432')
WHEN collection['hostname'] != '' THEN collection['hostname'] || ':' || if(collection['port'] != '', collection['port'], '5432')
END
```
Пример создания:
```sql
CREATE NAMED COLLECTION mypg AS
user = 'pguser',
password = 'jw8s0F4',
host = '127.0.0.1',
port = 5432,
database = 'test',
schema = 'test_schema'
```
Пример конфигурации:
```xml
@ -199,6 +222,10 @@ SELECT * FROM mypgtable;
└───┘
```
:::note
PostgreSQL копирует данные из named collection при создании таблицы. Изменения в коллекции не влияют на существующие таблицы.
:::
### Пример использования именованных соединений базой данных с движком PostgreSQL
```sql