aergoio / aergolite.swift

A type-safe, Swift-language layer over AergoLite

AergoLite.swift

A type-safe, Swift-language layer over AergoLite. Based on SQLite.swift

Features

• A pure-Swift interface
• A type-safe, optional-aware SQL expression builder
• A flexible, chainable, lazy-executing query layer
• Automatically-typed data access
• A lightweight, uncomplicated query and parameter binding interface
• Developer-friendly error handling and debugging
• Full-text search support
• Well-documented
• Extensively tested

Usage

import SQLite

let uri = "file:path/to/app.db?blockchain=on&discovery=local:4329&password=test"
let db = try Connection(uri)

let users = Table("users")
let id = Expression<Int64>("id")
let name = Expression<String?>("name")
let email = Expression<String>("email")

try db.run(users.create { t in
    t.column(id, primaryKey: true)
    t.column(name)
    t.column(email, unique: true)
})
// CREATE TABLE "users" (
//     "id" INTEGER PRIMARY KEY NOT NULL,
//     "name" TEXT,
//     "email" TEXT NOT NULL UNIQUE
// )

let insert = users.insert(name <- "Alice", email <- "[email protected]")
let rowid = try db.run(insert)
// INSERT INTO "users" ("name", "email") VALUES ('Alice', '[email protected]')

for user in try db.prepare(users) {
    print("id: \(user[id]), name: \(user[name]), email: \(user[email])")
    // id: 1, name: Optional("Alice"), email: [email protected]
}
// SELECT * FROM "users"

let alice = users.filter(id == rowid)

try db.run(alice.update(email <- email.replace("mac.com", with: "me.com")))
// UPDATE "users" SET "email" = replace("email", 'mac.com', 'me.com')
// WHERE ("id" = 1)

try db.run(alice.delete())
// DELETE FROM "users" WHERE ("id" = 1)

try db.scalar(users.count) // 0
// SELECT count(*) FROM "users"

SQLite.swift also works as a lightweight, Swift-friendly wrapper over the C API.

let stmt = try db.prepare("INSERT INTO users (email) VALUES (?)")
for email in ["[email protected]", "[email protected]"] {
    try stmt.run(email)
}

db.totalChanges    // 3
db.changes         // 1
db.lastInsertRowid // 3

for row in try db.prepare("SELECT id, email FROM users") {
    print("id: \(row[0]), email: \(row[1])")
    // id: Optional(2), email: Optional("[email protected]")
    // id: Optional(3), email: Optional("[email protected]")
}

try db.scalar("SELECT count(*) FROM users") // 2

Read the documentation or explore more, interactively, from the Xcode project’s playground.

For a more comprehensive example, see this article and the companion repository.

Installation

Note: Version 0.12 requires Swift 5 (and Xcode 10.2) or greater. Version 0.11.6 requires Swift 4.2 (and Xcode 10.1) or greater.

Carthage

Carthage is a simple, decentralized dependency manager for Cocoa. To install SQLite.swift with Carthage:

1. Make sure Carthage is installed.

2. Update your Cartfile to include the following:

   github "aergoio/AergoLite.swift" ~> 0.12.0

3. Run carthage update and add the appropriate framework.

CocoaPods

CocoaPods is a dependency manager for Cocoa projects. To install SQLite.swift with CocoaPods:

1. Make sure CocoaPods is installed. (SQLite.swift requires version 1.6.1 or greater.)

   # Using the default Ruby install will require you to use sudo when
   # installing and updating gems.
   [sudo] gem install cocoapods

2. Update your Podfile to include the following:

   use_frameworks!
   
   target 'YourAppTargetName' do
       pod 'SQLite.swift', '~> 0.12.0'
   end

3. Run pod install --repo-update.

Swift Package Manager

The Swift Package Manager is a tool for managing the distribution of Swift code.

1. Add the following to your Package.swift file:

dependencies: [
    .package(url: "https://github.com/aergoio/AergoLite.swift.git", from: "0.12.0")
]

2. Build your project:

$ swift build

Manual

To install AergoLite.swift as an Xcode sub-project:

1. Drag the SQLite.xcodeproj file into your own project. (Submodule, clone, or download the project first.)

   

2. In your target’s General tab, click the + button under Linked Frameworks and Libraries.

3. Select the appropriate SQLite.framework for your platform.

4. Add.

Some additional steps are required to install the application on an actual device:

5. In the General tab, click the + button under Embedded Binaries.

6. Select the appropriate SQLite.framework for your platform.

7. Add.

Author

• Stephen Celis (@stephencelis)

License

This wrapper is available under the MIT license, but AergoLite itself is dual licensed. Check the AergoLite repo for more details.