SQLite.swift

A type-safe, Swift-language layer over SQLite3.

SQLite.swift provides compile-time confidence in SQL statement syntax and intent.

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
• SQLCipher support via Swift Package Manager
• Schema query/migration
• First-class WAL mode and journaling configuration via Connection(_, journalMode: .wal) and the enableWAL() / walCheckpoint(...) APIs
• Works on Linux (with some limitations)
• Active support at StackOverflow, and Gitter Chat Room (experimental)

Usage

import SQLite

// Wrap everything in a do...catch to handle errors
do {
    let db = try Connection("path/to/db.sqlite3")

    let users = Table("users")
    let id = SQLite.Expression<Int64>("id")
    let name = SQLite.Expression<String?>("name")
    let email = SQLite.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"
} catch {
    print (error)
}

[!WARNING] Iterating the sequence that prepare(_:) returns force-tries each step. If SQLite reports an error partway through the results (for example SQLITE_BUSY while another connection holds a lock, or an I/O error), your app crashes instead of throwing. To handle these errors, read rows with prepareRowIterator(_:) instead. See Failable iteration.

Note that Expression should be written as SQLite.Expression to avoid conflicts with the SwiftUI.Expression if you are using SwiftUI too.

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

// Wrap everything in a do...catch to handle errors
do {
    // ...

    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
} catch {
    print (error)
}

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

Installation

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/stephencelis/SQLite.swift.git", from: "0.17.0")
]

1. Build your project:

$ swift build

See the Tests/SPM folder for a small demo project which uses SPM.

Manual

To install SQLite.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:

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

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

3. Add.

Communication

Read the contributing guidelines. The TL;DR (but please; R):

• Need help or have a general question? Ask on Stack Overflow (tag sqlite.swift).
• Found a bug or have a feature request? Open an issue.
• Want to contribute? Submit a pull request.

Original author

• Stephen Celis (@stephencelis)

License

SQLite.swift is available under the MIT license. See the LICENSE file for more information.

Related

These projects enhance or use SQLite.swift:

• SQLiteMigrationManager.swift (inspired by FMDBMigrationManager)

Alternatives

Looking for something else? Try another Swift wrapper (or FMDB):

• GRDB
• SQLiteDB