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https://github.com/codewinsdotcom/PostgresClientKit

A PostgreSQL client library for Swift. Does not require libpq.
https://github.com/codewinsdotcom/PostgresClientKit

database postgres postgresql server-side-swift swift

Last synced: 14 days ago
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A PostgreSQL client library for Swift. Does not require libpq.

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README 

        
# PostgresClientKit






  

    

  

  

  

  

  

    

  

  

  

  




PostgresClientKit provides a friendly Swift API for operating against a PostgreSQL database.



## Features



- **Doesn't require libpq.**  PostgresClientKit implements the Postgres network protocol in Swift, so it does not require `libpq`.



- **Developer-friendly API using modern Swift.**  For example, errors are represented by instances of `enum PostgresError: Error` and are raised by a `throw` or by returning a [`Result`](https://github.com/apple/swift-evolution/blob/master/proposals/0235-add-result.md).



- **Safe conversion between Postgres and Swift types.** Type conversion is explicit and robust.  Conversion errors are signaled, not masked.  PostgresClientKit provides additional Swift types for dates and times to address the impedance mismatch between Postgres types and Foundation `Date`.



- **Memory efficient.** The rows in a result are exposed through an iterator, not an array.  Rows are lazily retrieved from the Postgres server.



- **SSL/TLS support.** Encrypts the connection between PostgresClientKit and the Postgres server.



- **Well-engineered**.  Complete API documentation, an extensive test suite, actively supported.



Sounds good?  Let's look at an example.



## Example



This is a basic, but complete, example of how to connect to Postgres, perform a SQL `SELECT` command, and process the resulting rows.  It uses the `weather` table in the [Postgres tutorial](https://www.postgresql.org/docs/11/tutorial-table.html).



```swift

import PostgresClientKit



do {

    var configuration = PostgresClientKit.ConnectionConfiguration()

    configuration.host = "127.0.0.1"

    configuration.database = "example"

    configuration.user = "bob"

    configuration.credential = .scramSHA256(password: "welcome1")



    let connection = try PostgresClientKit.Connection(configuration: configuration)

    defer { connection.close() }



    let text = "SELECT city, temp_lo, temp_hi, prcp, date FROM weather WHERE city = $1;"

    let statement = try connection.prepareStatement(text: text)

    defer { statement.close() }



    let cursor = try statement.execute(parameterValues: [ "San Francisco" ])

    defer { cursor.close() }



    for row in cursor {

        let columns = try row.get().columns

        let city = try columns[0].string()

        let tempLo = try columns[1].int()

        let tempHi = try columns[2].int()

        let prcp = try columns[3].optionalDouble()

        let date = try columns[4].date()

    

        print("""

            \(city) on \(date): low: \(tempLo), high: \(tempHi), \

            precipitation: \(String(describing: prcp))

            """)

    }

} catch {

    print(error) // better error handling goes here

}

```



Output:



```

San Francisco on 1994-11-27: low: 46, high: 50, precipitation: Optional(0.25)

San Francisco on 1994-11-29: low: 43, high: 57, precipitation: Optional(0.0)

```



## Prerequisites



- **Swift 5 or later**  (PostgresClientKit uses Swift 5 language features)

- **`libssl-dev`** (only required on Linux)



PostgresClientKit is compatible with Linux, macOS, and iOS.  It has been tested on:



- Ubuntu 18.04 LTS, 20.04 LTS

- macOS 10.14, 10.15, 11, 12

- iOS 12, 13, 14, 15

- Postgres 10, 11, 12, 13, 14



## Building



```

cd 

swift package clean

swift build

```



## Testing



[Set up a Postgres database for testing](https://github.com/codewinsdotcom/PostgresClientKit/blob/master/Docs/setting_up_a_postgres_database_for_testing.md).  This is a one-time process.



Then:



```

cd 

swift package clean

swift build

swift test

```



## Using



### From an Xcode project (as a package dependency)



In Xcode:



- Select File > Add Packages...



- Enter the package URL: `https://github.com/codewinsdotcom/PostgresClientKit`



- Set the package version requirements (see [Decide on Package Requirements](https://developer.apple.com/documentation/xcode/adding-package-dependencies-to-your-app)).  For example, choose `Up To Next Major Version` and `1.0.0` to select the latest 1.x.x release of PostgresClientKit.



- Click Add Package.



Import to your source code file:



```swift

import PostgresClientKit

```



### From a standalone Swift package (`Package.swift`)



In your `Package.swift` file:



- Add PostgresClientKit to the `dependencies`.  For example:



```swift

dependencies: [

    .package(url: "https://github.com/codewinsdotcom/PostgresClientKit", from: "1.0.0"),

],

```



- Reference the `PostgresClientKit` product in the `targets`.  For example:



```swift

targets: [

    .target(

        name: "MyProject",

        dependencies: ["PostgresClientKit"]),

]

```



Import to your source code file:



```swift

import PostgresClientKit

```



### Using CocoaPods



Add `PostgresClientKit` to your `Podfile`.  For example:



```

target 'MyApp' do

  pod 'PostgresClientKit', '~> 1.0'

end

```



Then run `pod install`.



Import to your source code file:



```swift

import PostgresClientKit

```



## Documentation



- [API](https://codewinsdotcom.github.io/PostgresClientKit/Docs/API/index.html)

- [Troubleshooting](https://github.com/codewinsdotcom/PostgresClientKit/blob/master/Docs/troubleshooting.md)

- [FAQ](https://github.com/codewinsdotcom/PostgresClientKit/blob/master/Docs/faq.md)



## Additional examples



- [PostgresClientKit-CommandLine-Example](https://github.com/pitfield/PostgresClientKit-CommandLine-Example): an example command-line application



- [PostgresClientKit-iOS-Example](https://github.com/pitfield/PostgresClientKit-iOS-Example): an example iOS app



## Contributing



Thank you for your interest in contributing to PostgresClientKit.



This project has a code of conduct.  See [CODE_OF_CONDUCT.md](https://github.com/codewinsdotcom/PostgresClientKit/blob/master/CODE_OF_CONDUCT.md) for details.



Please use [issues](https://github.com/codewinsdotcom/PostgresClientKit/issues) to:



- ask questions

- report problems (bugs)

- request enhancements



Pull requests against the `develop` branch are welcomed.  For a non-trivial contribution (for example, more than correcting spelling, typos, or whitespace) please first discuss the proposed change by opening an issue.

    

## License



PostgresClientKit is licensed under the Apache 2.0 license.  See [LICENSE](https://github.com/codewinsdotcom/PostgresClientKit/blob/master/LICENSE) for details.



## Versioning



PostgresClientKit uses [Semantic Versioning 2.0.0](https://semver.org).  For the versions available, see the [tags on this repository](https://github.com/codewinsdotcom/PostgresClientKit/releases).



## Built with



- [Kitura BlueSocket](https://github.com/Kitura/BlueSocket) - socket library

- [Kitura BlueSSLService](https://github.com/Kitura/BlueSSLService) - SSL/TLS support

- [Jazzy](https://github.com/realm/jazzy) - generation of API documentation pages



## Authors



- David Pitfield [(@pitfield)](https://github.com/pitfield)