SQLite.swift 使用

原理介绍就不说赘述了，直接集成。

1. cocoapods配置sdk

pod 'SQLite.swift'

2. model模型直接用字段名得先封装以下，这里我们转换(宏定义)一下，方便引用

//1.声明model模型
class CDOptionModel: NSObject {
    enum CDOptionType:String {
        case yes = "YES"
        case no = "NO"
    }
    var title:String = "" //字符串
    var isLike = false  //布尔
    var createTime:Int = 0  //Int值
    var type:CDOptionType = .no   //枚举
}

2.转化(宏定义)，在后续操作中可用以下别名
let sqlFileName = "MySQL.db"   //数据库名称
let OptionModel = Table("TabName") //表名称，可同model名
let db_id = Expression("id") //数据库自增id
let db_title = Expression("title")
let db_createTime = Expression("createTime") //创建时间
let db_type = Expression("type") //分类

3. 创建数据库，创建表

class CDSqlManager: NSObject {
    static let shared = CDSqlManager()
    var db:Connection!
    private override init() {
        super.init()
        objc_sync_enter(self)
        openDatabase()
        objc_sync_exit(self)
    }
//创建数据库文件
    private func openDatabase() {
        let libraryPath = NSSearchPathForDirectoriesInDomains(.libraryDirectory, .userDomainMask, true).first!
        let dbpath = libraryPath().appendingPathComponent(str: "/\(sqlFileName)")
        if !FileManager.default.fileExists(atPath: dbpath) {
            FileManager.default.createFile(atPath: dbpath, contents: nil, attributes: nil)
            db = try! Connection(dbpath)
            createTable()
        }else{
            do{
                db = try Connection(dbpath)
                CDPrint(item: "数据库连接成功")
            }catch{
                CDPrint(item: "数据库连接失败:\(error.localizedDescription)")
            }
        }
    }
//建议：每个表加一个扩展，在该扩展下写该表的所有操作，本文件只用来建、连数据库，数据库更新等
    private func createTable() -> Void {
        CDPrintManager.log("创建数据库表", type: .InfoLog)
        createOptionTable()
    }
}

    func CDPrint(item:Any) {
        print(item)
    }

4.数据的增删改查 因为数据模型比较多时，全部写在同一个文件不好阅读和维护，建议一个表写入一个扩展文件中 CDSqlManager+option.swift

extension CDSqlManager{
    
    //创建表
    internal func createOptionTable() -> Void {
        do{
            let create = OptionModel.create(temporary: false, ifNotExists: false, withoutRowid: false) { (build) in
                build.column(db_id,primaryKey: true)
                build.column(db_title)
                build.column(db_createTime)
                build.column(db_isLike)
                build.column(db_type)
            }
            try db.run(create)
            CDPrint(item:"createOptionModel -->success")

        }catch{
            CDPrint(item:"createOptionModel -->error:\(error)")
        }
    }
    
//所有query，数据库模型转OptionModel
    private func getNKOptionModelFromItem(item:Row) -> NKOptionModel {
        let info = NKOptionModel()
        info.title = item[db_title]
        info.createTime = item[db_createTime]
        info.type = NKOptionType(rawValue: item[db_type])!
        info.isLike = item[db_isLike]
        return info
    }
    
//查询字段的属性，直接在字段后跟上该属性，.max()，.min() 
    private func queryMaxInt()->Int{
        //查询表内最大id,新记录的id = 最大id+1
        var maxInt = 0
        do{
            maxInt = try db.scalar(OptionModel.select(db_createTime.max)) ?? 0
            CDPrint(item:"queryAllModelList -->success")
        }catch{
            CDPrintManager.log("queryAllModelList -->error:\(error)", type: .ErrorLog)
        }
        return maxFileId
    }
    //添加数据
    func addNKOptionModel(info:NKOptionModel) {
        let ModelId = queryMaxModelId() + 1
        do {
            try db.run(OptionModel.insert(
                //用户模型向数据库模型赋值，用<-
                db_title <- info.title,
                db_createTime <- info.createTime,
                db_type <- info.type.rawValue,
                db_isLike <- info.isLike)
            )
        } catch  {
            CDPrint(item: "addNKOptionModel error:\(error)")
        }
    }
    
//删除模型 filter表条件，多个条件可用&& || ,类似OC sql 语句中的where xxx and xxx, where xxx or xxx
    func deleteOneModel(info:NKOptionModel){
        do {
            try db.run(OptionModel.filter(db_title == info.title).delete())
        } catch  {
            CDPrint(item:"deleteOneModel -->error:\(error)")
        }
    }
    //删除tab内所有数据
    func deleteAllModel(){
        do {
            try db.run(OptionModel.delete())
        } catch  {
            CDPrint(item:"deleteOneModel -->error:\(error)")
        }
    }
    
//改
    func updateModelTitle(type:CDOptionType,title:String,changeTime:Int){
        do {
            let sql = OptionModel.filter(db_title == title && db_type == type.rawValue) //多个条件可用&& = and, || = or
            try db.run(sql.update(db_changeTime <- changeTime))
        } catch  {
            CDPrint(item:"updateModelTitle -->error:\(error)")
        }
    }
    
//查询tab内所有数据
    func queryAllModelList() -> [NKOptionModel]{
        var arr:[NKOptionModel] = []
        do {
            //desc 降序，aes 升序
            let sql = OptionModel.order(db_createTime.desc)
            for item in try db.prepare(sql) {
                let info = getNKOptionModelFromItem(item: item)
                arr.append(info)
            }
        } catch  {
            CDPrint(item:"queryAllModelList -->error:\(error)")
        }
        return arr
    }
}
//查询单个字段
func queryCreateTime(title:String) -> Int{
        var index = 0
        do {
            let sql = OptionModel.filter(db_title == title)
            for item in try db.prepare(sql.select(db_createTime)) {
                index = item[db_createTime]
            }
        } catch  {
            CDPrint(item:"queryCreateTime -->error:\(error)")
        }
        return index

注意：

        //条件关键字:filter
        //修改更新关键字:db.update(sql)
        //查询db.prepare(sql)
        //执行sql语句： db.run(sql)
        //删除的sql: dbModel.filter(条件).delete() 
        //删除整个表记录的sql: dbModel.delete() 
        //符合条件数量的sql dbModel.filter(条件).count
        //表内所有数量的sql dbModel.count