GuidesDownload

Data Persistency with SQLite.Swift

Use SQLite.Swift on Android and iOS with zero code changes

Suggest Edits

Introduction

SCADE provides support of all necessary APIs, including Swift Foundation und linking of C libraries that are necessary for running SQLite.Swift:

All your pure SQLite.swift code compiles and runs on Android without modifications

📘

Download Sourcecode

Please see the UgSqliteSwift project for the source code created in this chapter. See Installing examples for information on how to download the examples. The URL is https://github.com/scadedoc/UgExamples/tree/master/UgSwissClockDemo

Add SQLite libraries and modulemap file

The use of SQLite and SQLite.Swift is straightforward and easy:

1. Setup directory structure

Add the following directory structure below <project_root>

./lib/android/x86
./lib/android/armeabi-v7a
./lib/include

2. Copy files

👍

File location

Please find all files in Examples section on GitHub here https://github.com/scadedoc/UgExamples/tree/master/UgSqlLiteSwift/lib/android

  • Copy to x86/libsqlite3.so to ./lib/android/x86
  • Copy to armeabi-v7a/libsqlite3.so to ./lib/android/armeabi-v7a
  • Copy header file sqlite3.h to ./lib/include
  • Copy module map file module.modulemap to ./lib/include
module SQLite3 [system] [extern_c] {
    header "sqlite3.h"
    link "sqlite3"
    export *
}

Your directory should now look like this

Add dependency for SQLite.Swift

Open your build file and add the dependency

Your build.file should look similar to this now:

Replace main.page.swift with sample code

import ScadeKit
import SQLite

class MainPageAdapter: SCDLatticePageAdapter {

	// page adapter initialization
	override func load(_ path: String) {		
		super.load(path)
		
		do {
			let db = try Connection(NSHomeDirectory() + "/data.db")
	
			let users = Table("users")
			let id = Expression<Int64>("id")
			let name = Expression<String?>("name")
			let email = Expression<String>("email")
			
			_ = try?  w w 		  		 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: \(error)")
		}
		
	}
}

Run the project

You should see the following output in the console.

Updated over 5 years ago