标签:
在可移植类库 新建:
using SQLite.Net.Interop; using System; using System.Collections.Generic; using System.Linq; using System.Text; using System.Threading.Tasks; namespace CommonLib { /// <summary> /// 数据存储环境 /// </summary> public interface IDataStorage { /// <summary> /// 存储路径 /// </summary> string StoragePath { get; } /// <summary> ///SQLite 平台环境 /// IOS: SQLite.Net.Platform.XamarinIOS.SQLitePlatformIOS /// Android: SQLite.Net.Platform.XamarinAndroid.SQLitePlatformAndroid ///... /// </summary> ISQLitePlatform SqlitePlatform { get; } } }
using System; using System.Collections.Generic; using System.Linq; using System.Text; using System.Threading.Tasks; using SQLite.Net; namespace CommonLib { /// <summary> /// SQLite上下文 /// </summary> public class SQLiteContext { public SQLiteContext() { } private IDataStorage _dataStorage; /// <summary> /// 构造上下文 /// </summary> /// <param name="dataStorage">数据存储环境</param> public SQLiteContext(IDataStorage dataStorage) { _dataStorage = dataStorage; } /// <summary> /// SQLite上下文 /// </summary> protected SQLiteContext Connection { get { return this; } } /// <summary> /// 创建链接 /// </summary> /// <returns></returns> public SQLiteConnection New() { if (_dataStorage == null) throw new ArgumentException("SQLiteContext构造时缺少IDataStorage对象实例!"); return new SQLite.Net.SQLiteConnection(_dataStorage.SqlitePlatform, _dataStorage.StoragePath); } } }
在xamarin.Android 工程内新建 SQLiteStorage.cs
/// <summary> /// 数据存储环境 /// </summary> public class SQLiteStorage : IDataStorage { /// <summary> /// 存储路径 /// </summary> public string StoragePath { get { // 获取数据库文件存储路径 return System.IO.Path.Combine( System.Environment.GetFolderPath( System.Environment.SpecialFolder.Personal), "db.db"); } } /// <summary> /// SQLite 平台环境 /// Android: SQLite.Net.Platform.XamarinAndroid.SQLitePlatformAndroid /// IOS: SQLite.Net.Platform.XamarinIOS.SQLitePlatformIOS /// ... /// </summary> public SQLite.Net.Interop.ISQLitePlatform SqlitePlatform { get { return new SQLite.Net.Platform.XamarinAndroid.SQLitePlatformAndroid(); } } }
使用例子:
using System; using System.Collections.Generic; using System.Linq; using System.Text; using SQLite.Net; using CommonLib; namespace BusinessLib { /// <summary> /// 涉及到操作SQLite时需要继承 ZsCMS.CommonLib.SQLiteContext /// </summary> public class TestSqlte: SQLiteContext { /// <summary> /// /// </summary> /// <param name="dataStorage">数据存储环境</param> public TestSqlte(IDataStorage dataStorage) : base(dataStorage)// 将UI层平台信息传入父类.创建当前平台的SQLite上下文 { } public void Insert(ZsCMS.ModelsLib.TestSqlte model) { // 通过父类Connection 创建数据链接 using (var conn= Connection.New()) { // 当表存在不会被创建,不存在表则创建 conn.CreateTable<ZsCMS.ModelsLib.TestSqlte>(); // 往表中添加数据 conn.Insert(model); } } public IEnumerable<ZsCMS.ModelsLib.TestSqlte> Gets() { using (var conn = Connection.New()) { // 查询数据列表 return conn.Query<ZsCMS.ModelsLib.TestSqlte>("select * from TestSqlte"); } } } }
标签:
原文地址:http://www.cnblogs.com/mycing/p/5557027.html