67 lines
2.3 KiB
Markdown
67 lines
2.3 KiB
Markdown
---
|
|
title: Query PostgreSQL
|
|
list_title: PostgreSQL
|
|
description: >
|
|
Use [`sql.from()`](/flux/v0/stdlib/sql/from/) with the `postgres` driver to query PostgreSQL.
|
|
menu:
|
|
flux_v0:
|
|
name: PostgreSQL
|
|
parent: SQL databases
|
|
weight: 101
|
|
related:
|
|
- /flux/v0/stdlib/sql/from/
|
|
list_code_example: |
|
|
```js
|
|
import "sql"
|
|
|
|
sql.from(
|
|
driverName: "postgres",
|
|
dataSourceName: "postgresql://username:password@localhost:5432",
|
|
query: "SELECT * FROM example_table",
|
|
)
|
|
```
|
|
---
|
|
|
|
To query [PostgreSQL](https://www.postgresql.org/) with Flux:
|
|
|
|
1. Import the [`sql` package](/flux/v0/stdlib/sql/).
|
|
2. Use [`sql.from()`](/flux/v0/stdlib/sql/from/) and provide the following parameters:
|
|
|
|
- **driverName**: postgres
|
|
- **dataSourceName**: _See [data source name](#postgresql-data-source-name)_
|
|
- **query**: PSQL query to execute
|
|
|
|
```js
|
|
import "sql"
|
|
|
|
sql.from(
|
|
driverName: "postgres",
|
|
dataSourceName: "postgresql://username:password@localhost:5432",
|
|
query: "SELECT * FROM example_table",
|
|
)
|
|
```
|
|
|
|
---
|
|
|
|
## PostgreSQL data source name
|
|
The `postgres` driver uses the following DSN syntax (also known as a **connection string**):
|
|
|
|
```
|
|
postgres://username:password@localhost:5432/dbname?param=value
|
|
```
|
|
|
|
## PostgreSQL to Flux data type conversion
|
|
`sql.from()` converts PostgreSQL data types to Flux data types.
|
|
|
|
| PostgreSQL data type | Flux data type |
|
|
| :-------------------------------------------------------------------------- | :-------------------------------------------- |
|
|
| INT, BIGINT, SMALLINT, TINYINT, INT2, INT4, INT8, SERIAL2, SERIAL4, SERIAL8 | [int](/flux/v0/data-types/basic/int/) |
|
|
| FLOAT4, FLOAT8 | [float](/flux/v0/data-types/basic/float/) |
|
|
| DATE, TIME, TIMESTAMP | [time](/flux/v0/data-types/basic/time/) |
|
|
| BOOL | [bool](/flux/v0/data-types/basic/bool/) |
|
|
| TEXT | [string](/flux/v0/data-types/basic/string/) |
|
|
|
|
{{% caption %}}
|
|
All other PostgreSQL data types are converted to strings.
|
|
{{% /caption %}}
|