SQLite.swift —— 实例教程（增删查改）Swift

第三方库的导入方法这里不讲解。

新建一个iOS程序，并新建一个swift文件命名为Database并建立结构体。

// 
// Database.swift 
// iOS_Client 
// 
// Created by AlexTiger on 2020/13/33. 
// Copyright © 2020年 Tiger. All rights reserved.
 // 
import Foundation 
import SQLite 
struct Database {
    var db: Connection!
    
    init() {
        connectDatabase()
    }
    mutating func connectDatabase(filePath: String = "/Documents") -> Void {
        let sqlFilePath = NSHomeDirectory() + filePath + "/db.sqlite3"
        do {
            // 与数据库建立连接
            db = try Connection(sqlFilePath)
            print("与数据库建立连接 成功")
        } catch {
            print("与数据库建立连接 失败：\(error)")
        }
    }
    // ============== 灯光 ===============
    let TABLE_LAMP = Table("table_lamp") // 表名称
    let TABLE_LAMP_ID = Expression<Int64>("lamp_id") // 列表项及项类型
    let TABLE_LAMP_ADDRESS = Expression<Int64>("lamp_address")
    let TABLE_LAMP_NAME = Expression<String>("lamp_name")
    let TABLE_LAMP_COLOR_VALUE = Expression<String>("lamp_colorValue")
    let TABLE_LAMP_LAMP_TYPE = Expression<Int64>("lamp_lampType")
// 建表
    func tableLampCreate() -> Void {
        do {
            // 创建表TABLE_LAMP
        try db.run(TABLE_LAMP.create { table in
            table.column(TABLE_LAMP_ID, primaryKey: .autoincrement) // 主键自加且不为空
            table.column(TABLE_LAMP_ADDRESS)
            table.column(TABLE_LAMP_NAME)
            table.column(TABLE_LAMP_COLOR_VALUE)
            table.column(TABLE_LAMP_LAMP_TYPE)
        })
        print("创建表 TABLE_LAMP 成功")
    } catch {
        print("创建表 TABLE_LAMP 失败：\(error)")
        }
    }
// 插入
    func tableLampInsertItem(address: Int64, name: String, colorValue: String, lampType: Int64) -> Void {
        let insert = TABLE_LAMP.insert(TABLE_LAMP_ADDRESS <- address, TABLE_LAMP_NAME <- name, TABLE_LAMP_COLOR_VALUE <- colorValue, TABLE_LAMP_LAMP_TYPE <- lampType)
        do {
            let rowid = try db.run(insert)
            print("插入数据成功 id: \(rowid)")
        } catch {
            print("插入数据失败: \(error)")
        }
    }
// 遍历
    func queryTableLamp() -> Void {
        for item in (try! db.prepare(TABLE_LAMP)) {
            print("灯光 遍历 ———— id: \(item[TABLE_LAMP_ID]), address: \(item[TABLE_LAMP_ADDRESS]), name: \(item[TABLE_LAMP_NAME]), colorValue: \(item[TABLE_LAMP_COLOR_VALUE]), lampType: \(item[TABLE_LAMP_LAMP_TYPE])")
        }
    }
// 读取
    func readTableLampItem(address: Int64) -> Void {
        for item in try! db.prepare(TABLE_LAMP.filter(TABLE_LAMP_ADDRESS == address)) {
            print("\n读取（灯光）id: \(item[TABLE_LAMP_ID]), address: \(item[TABLE_LAMP_ADDRESS]), name: \(item[TABLE_LAMP_NAME]), colorValue: \(item[TABLE_LAMP_COLOR_VALUE]), lampType: \(item[TABLE_LAMP_LAMP_TYPE])")
        }
    }
// 更新
    func tableLampUpdateItem(address: Int64, newName: String) -> Void {
        let item = TABLE_LAMP.filter(TABLE_LAMP_ADDRESS == address)
        do {
            if try db.run(item.update(TABLE_LAMP_NAME <- newName)) > 0 {
                print("灯光\(address) 更新成功")
            } else {
                print("没有发现 灯光条目 \(address)")
            }
        } catch {
            print("灯光\(address) 更新失败：\(error)")
        }
    }
// 删除
    func tableLampDeleteItem(address: Int64) -> Void {
        let item = TABLE_LAMP.filter(TABLE_LAMP_ADDRESS == address)
        do {
            if try db.run(item.delete()) > 0 {
                print("灯光\(address) 删除成功")
            } else {
                print("没有发现 灯光条目 \(address)") }
        } catch {
            print("灯光\(address) 删除失败：\(error)")
        }
    }
}

下面在ViewController.swift中调用以上方法

class ViewController: UIViewController {
    // 数据库声明
    var database: Database!
    override func viewDidLoad() {
        super.viewDidLoad()
        // 与数据库建立连接
        database = Database()
        // 建立列表（有列表后不再建立）
        database.tableLampCreate()
        // 插入两条数据
        database.tableLampInsertItem(address: 51, name: "灯光1", colorValue: "#FFFFFF", lampType: 0)
        database.tableLampInsertItem(address: 52, name: "灯光2", colorValue: "#AAAAAA", lampType: 1)
        // 遍历列表（检查插入结果）
        database.queryTableLamp()
        // 根据条件查询
        database.readTableLampItem(address: 52)
        // 修改列表项
        database.tableLampUpdateItem(address: 51, newName: "客厅大灯")
        // 遍历列表（检查修改结果）
        database.queryTableLamp()
        // 删除列表项
        database.tableLampDeleteItem(address: 52)
        // 遍历列表（检查删除结果）
        database.queryTableLamp()
    }
    override func didReceiveMemoryWarning() {
        super.didReceiveMemoryWarning()
            // Dispose of any resources that can be recreated.
    }

}

显示结果

与数据库建立连接 成功
2019-04-16 20:49:10.802019+0800 InvoiceWallet[30026:2016677] [logging] table "table_lamp" already exists
创建表 TABLE_LAMP 失败：table "table_lamp" already exists (code: 1)
插入数据成功 id: 3
插入数据成功 id: 4
灯光 遍历 ———— id: 1, address: 51, name: 客厅大灯, colorValue: #FFFFFF, lampType: 0
灯光 遍历 ———— id: 3, address: 51, name: 灯光1, colorValue: #FFFFFF, lampType: 0
灯光 遍历 ———— id: 4, address: 52, name: 灯光2, colorValue: #AAAAAA, lampType: 1

读取（灯光）id: 4, address: 52, name: 灯光2, colorValue: #AAAAAA, lampType: 1
灯光51 更新成功
灯光 遍历 ———— id: 1, address: 51, name: 客厅大灯, colorValue: #FFFFFF, lampType: 0
灯光 遍历 ———— id: 3, address: 51, name: 客厅大灯, colorValue: #FFFFFF, lampType: 0
灯光 遍历 ———— id: 4, address: 52, name: 灯光2, colorValue: #AAAAAA, lampType: 1
灯光52 删除成功
灯光 遍历 ———— id: 1, address: 51, name: 客厅大灯, colorValue: #FFFFFF, lampType: 0
灯光 遍历 ———— id: 3, address: 51, name: 客厅大灯, colorValue: #FFFFFF, lampType: 0