Realm Swift版

Realm swift中文文檔地址：https://realm.io/cn/docs/swift/latest/#local-migrations

Realm 安裝

教程在這（非新手請?zhí)^）
http://www.reibang.com/p/49cde6aeb43a

我用的是
pod 'RealmSwift'

2.Xcode 插件

Xcode插件讓新建Realm模型model很輕松揣钦。用Alcatraz安裝RealmPlugin镀脂。

你使用Xcode新建文件File > New > File… — or ? N,可以看到有一個新建Realm模型create a new realm model的選項必尼。

3. 數(shù)據(jù)庫的使用

1. 創(chuàng)建數(shù)據(jù)模型

以項目中為例，存儲記錄。

import Foundation
import RealmSwift

class Dog: Object {
    @objc dynamic var name = ""
    @objc dynamic var age = 0
}
class Person: Object {
   @objc dynamic var ID = 0
    @objc dynamic var name = ""
    @objc dynamic var age = 0
    var dogs = List<Dog>() //model 嵌套
    var weeks = List<Int>()//數(shù)組
    var strS = List<String>()//數(shù)組
    @objc dynamic var haha = 0
    @objc dynamic var dfd = 0
    @objc dynamic var erer = 0
  override static func primaryKey() -> String? {
        return "ID"
    }//主鍵
}

2. 創(chuàng)建數(shù)據(jù)模型對象

        let otherDog = Dog(value: ["name":"豆豆","age":3])
        let myDog = Dog()
        myDog.name = "Rex"
        myDog.age = 1
        print("name of dog: \(myDog.name)")
        
        let aPerson = Person(value: ["Jane", 30, [myDog,otherDog],[1,2],["df","df"]])
        
        let otherPerson = Person()
        otherPerson.name = "哈哈"
        otherPerson.age = 30
        otherPerson.dogs = List<Dog>()
        otherPerson.dogs.append(myDog)
        otherPerson.weeks = List<Int>()
        otherPerson.weeks.append(1)
        otherPerson.weeks.append(2)
        otherPerson.strS  = List<String>()
        otherPerson.strS.append("sdfsd")

3. 數(shù)據(jù)庫操作（增刪改查）

任何時候都需要獲取Realm實例岗宣，每個線程只需要使用一次即可弄痹。

     // 獲取默認的 Realm 數(shù)據(jù)庫
        let realm = try! Realm()
    //打印地址
        print(realm.configuration.fileURL!)

查詢數(shù)據(jù)

• 普通查詢

    let lists = realm.object(Person.self)

• 逐漸查詢：根據(jù)逐漸查詢某張表的某條數(shù)據(jù)罩引，模型必須包含主鍵，否則會崩潰排苍。

    let tem = realm.object(ofType: Person.self, forPromaykey: "1")

• 條件查詢: 根據(jù)斷言字符串 或者 NSPredicate 謂詞 查詢某張表中的符合條件數(shù)據(jù)

    let tem = realm.object(Person.self).filter("name == %@", "哈哈"

    let predicate = NSPredicate(format: "name contains %@ and age == ","哈哈"沦寂，1）
    let temps = realm.objects(Person.self).filter(predicate)

數(shù)據(jù)排序

    /* 根據(jù)搜索內(nèi)容排序   默認是升序排序*/ 
    let lists = realm.objects(Person.self).sorted(byKeyPath: "age")
    /* 根據(jù)搜索內(nèi)筒降序排序*/
    let lists = realm.objects(Person.self).sorted(byKeyPath: "age", ascending: false)

增加數(shù)據(jù)

        //替換存在的歷史記錄
        let model = Person(value: ["張三",2])
        let lists = realm.objects(Person.self)
        if lists.count > 0 {
            for temp in lists {
                if temp.name == model.name && temp.age == model.age{
                    realm.delete(temp)
                    break
                }
            }
        }
        try! realm.write {
            realm.add(model)
        }

刪除數(shù)據(jù)

    /* 刪除指定類型的數(shù)據(jù)*/
        let tem = realm.objects(Person.self).filter("age == %lu", isNotHomeComing)
        try! realm.write {
            rel.delete(tem)
        }
        resetSubViews()
        self.tableView?.reloadData()

修改數(shù)據(jù)

• 直接更細內(nèi)容

    let lists = realm.objects(Person.self)
    for model in lists{
        if model.name == "張三" {
            try! rel.write {
                model.name = ""
            }
            break
        }
    }

• 根據(jù)主鍵更新

如果在model類型中設(shè)置了主鍵的話，那么你可以使用realm().add(_:update:)

守得于開見月明淘衙。