Sqlite in Xamarin.Android

SqliteDemo/SqliteDemo.sln

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+
+Microsoft Visual Studio Solution File, Format Version 12.00
+# Visual Studio 15
+VisualStudioVersion = 15.0.27130.2026
+MinimumVisualStudioVersion = 10.0.40219.1
+Project("{FAE04EC0-301F-11D3-BF4B-00C04F79EFBC}") = "SqliteDemo", "SqliteDemo\SqliteDemo.csproj", "{06A73000-DB5D-42F9-BA5F-A1978003AA4E}"
+EndProject
+Global
+	GlobalSection(SolutionConfigurationPlatforms) = preSolution
+		Debug|Any CPU = Debug|Any CPU
+		Release|Any CPU = Release|Any CPU
+	EndGlobalSection
+	GlobalSection(ProjectConfigurationPlatforms) = postSolution
+		{06A73000-DB5D-42F9-BA5F-A1978003AA4E}.Debug|Any CPU.ActiveCfg = Debug|Any CPU
+		{06A73000-DB5D-42F9-BA5F-A1978003AA4E}.Debug|Any CPU.Build.0 = Debug|Any CPU
+		{06A73000-DB5D-42F9-BA5F-A1978003AA4E}.Debug|Any CPU.Deploy.0 = Debug|Any CPU
+		{06A73000-DB5D-42F9-BA5F-A1978003AA4E}.Release|Any CPU.ActiveCfg = Release|Any CPU
+		{06A73000-DB5D-42F9-BA5F-A1978003AA4E}.Release|Any CPU.Build.0 = Release|Any CPU
+		{06A73000-DB5D-42F9-BA5F-A1978003AA4E}.Release|Any CPU.Deploy.0 = Release|Any CPU
+	EndGlobalSection
+	GlobalSection(SolutionProperties) = preSolution
+		HideSolutionNode = FALSE
+	EndGlobalSection
+	GlobalSection(ExtensibilityGlobals) = postSolution
+		SolutionGuid = {CEF344A6-F7AB-4726-8587-FC793454C218}
+	EndGlobalSection
+EndGlobal

SqliteDemo/SqliteDemo/Acitvities/AddActivity.cs

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+using System;
+using System.Collections.Generic;
+using System.Linq;
+using System.Text;
+
+using Android.App;
+using Android.Content;
+using Android.OS;
+using Android.Runtime;
+using Android.Views;
+using Android.Widget;
+using SqliteDemo.Managers;
+using SqliteDemo.Models;
+
+namespace SqliteDemo.Acitvities
+{
+    [Activity(Label = "AddActivity")]
+    public class AddActivity : Activity
+    {
+        protected override void OnCreate(Bundle savedInstanceState)
+        {
+            base.OnCreate(savedInstanceState);
+            SetContentView(Resource.Layout.AddLayout);
+
+            Button add = FindViewById<Button>(Resource.Id.add_btn_add);
+            EditText name = FindViewById<EditText>(Resource.Id.add_edit_name);
+            EditText sex = FindViewById<EditText>(Resource.Id.add_edit_sex);
+            EditText age = FindViewById<EditText>(Resource.Id.add_edit_age);
+
+            add.Click += (s, e) =>
+            {
+                SqliteManager<Person> sqlite = new SqliteManager<Person>();
+
+                sqlite.Insert(new Person
+                {
+                    Name = name.Text,
+                    Sex = sex.Text,
+                    Age = Convert.ToInt32(age.Text)
+                });
+            };
+        }
+    }
+}

SqliteDemo/SqliteDemo/Acitvities/DeleteActivity.cs

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+using System;
+using System.Collections.Generic;
+using System.Linq;
+using System.Text;
+
+using Android.App;
+using Android.Content;
+using Android.OS;
+using Android.Runtime;
+using Android.Views;
+using Android.Widget;
+using SqliteDemo.Managers;
+using SqliteDemo.Models;
+
+namespace SqliteDemo.Acitvities
+{
+    [Activity(Label = "DeleteActivity")]
+    public class DeleteActivity : Activity
+    {
+        protected override void OnCreate(Bundle savedInstanceState)
+        {
+            base.OnCreate(savedInstanceState);
+            SetContentView(Resource.Layout.DeleteLayout);
+
+            Button del = FindViewById<Button>(Resource.Id.del_btn_del);
+            EditText id = FindViewById<EditText>(Resource.Id.del_edit_id);
+
+            del.Click += (s, e) =>
+            {
+                SqliteManager<Person> sqlite = new SqliteManager<Person>();
+
+                sqlite.DbConnection.Execute($"delete from Person where id = '{id.Text}'");
+            };
+        }
+    }
+}

SqliteDemo/SqliteDemo/Acitvities/QueryActivity.cs

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+using System;
+using System.Collections.Generic;
+using System.Linq;
+using System.Text;
+
+using Android.App;
+using Android.Content;
+using Android.OS;
+using Android.Runtime;
+using Android.Views;
+using Android.Widget;
+using SqliteDemo.Managers;
+using SqliteDemo.Models;
+
+namespace SqliteDemo.Acitvities
+{
+    [Activity(Label = "QueryActivity")]
+    public class QueryActivity : Activity
+    {
+        protected override void OnCreate(Bundle savedInstanceState)
+        {
+            base.OnCreate(savedInstanceState);
+            SetContentView(Resource.Layout.QueryLayout);
+
+            TextView res = FindViewById<TextView>(Resource.Id.que_text_res);
+
+            SqliteManager<Person> sqlite = new SqliteManager<Person>();
+            var list = sqlite.QueryAll();
+            foreach (var item in list)
+            {
+                res.Text += $"ID:{item.ID}  Name:{item.Name}  Sex:{item.Sex}  Age:{item.Age}\n";
+            }
+        }
+    }
+}

SqliteDemo/SqliteDemo/Assets/AboutAssets.txt

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+Any raw assets you want to be deployed with your application can be placed in
+this directory (and child directories) and given a Build Action of "AndroidAsset".
+
+These files will be deployed with you package and will be accessible using Android's
+AssetManager, like this:
+
+public class ReadAsset : Activity
+{
+	protected override void OnCreate (Bundle bundle)
+	{
+		base.OnCreate (bundle);
+
+		InputStream input = Assets.Open ("my_asset.txt");
+	}
+}
+
+Additionally, some Android functions will automatically load asset files:
+
+Typeface tf = Typeface.CreateFromAsset (Context.Assets, "fonts/samplefont.ttf");

SqliteDemo/SqliteDemo/MainActivity.cs

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+using Android.App;
+using Android.Widget;
+using Android.OS;
+using Android.Content;
+using SqliteDemo.Acitvities;
+using SqliteDemo.Managers;
+using SqliteDemo.Models;
+
+namespace SqliteDemo
+{
+    [Activity(Label = "SqliteDemo", MainLauncher = true, Theme = "@android:style/Theme.Material.Light")]
+    public class MainActivity : Activity
+    {
+        protected override void OnCreate(Bundle savedInstanceState)
+        {
+            base.OnCreate(savedInstanceState);
+            SetContentView(Resource.Layout.Main);
+
+            Button add = FindViewById<Button>(Resource.Id.main_btn_add);         
+            Button del = FindViewById<Button>(Resource.Id.main_btn_del);
+            Button que = FindViewById<Button>(Resource.Id.main_btn_que);
+
+            add.Click += (s, e) =>
+            {
+                Intent dialog = new Intent(this, typeof(AddActivity));
+                StartActivity(dialog);
+            };
+            del.Click += (s, e) =>
+            {
+                Intent dialog = new Intent(this, typeof(DeleteActivity));
+                StartActivity(dialog);
+            };
+            que.Click += (s, e) =>
+            {
+                Intent dialog = new Intent(this, typeof(QueryActivity));
+                StartActivity(dialog);
+            };
+
+            SqliteManager<Person> sqlite = new SqliteManager<Person>();
+            sqlite.CreateTable();
+        }
+    }
+}
+

SqliteDemo/SqliteDemo/Managers/SqliteManager.cs

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+using System;
+using System.Collections.Generic;
+using System.IO;
+using System.Linq;
+using System.Text;
+
+using Android.App;
+using Android.Content;
+using Android.OS;
+using Android.Runtime;
+using Android.Views;
+using Android.Widget;
+using SQLite.Net;
+using SQLite.Net.Platform.XamarinAndroid;
+
+namespace SqliteDemo.Managers
+{
+    class SqliteManager<T> where T : class
+    {
+        /// <summary>
+        /// 数据库文件路径
+        /// </summary>
+        private string dbPath = string.Empty;
+
+        public string DbPath
+        {
+            get
+            {
+                if (string.IsNullOrEmpty(dbPath))
+                {
+                    dbPath = Path.Combine(System.Environment.GetFolderPath(System.Environment.SpecialFolder.Personal), "info.db3");
+                }
+
+                return dbPath;
+            }
+        }
+
+        /// <summary>
+        /// 数据库连接
+        /// </summary>
+        public SQLiteConnection DbConnection
+        {
+            get
+            {
+                return new SQLiteConnection(new SQLitePlatformAndroid() ,DbPath);
+            }
+        }
+
+        public SqliteManager()
+        {
+
+        }
+
+        public SqliteManager(string dbPath)
+        {
+            this.dbPath = dbPath;
+        }
+
+        /// <summary>
+        /// 创建表
+        /// </summary>
+        public void CreateTable()
+        {
+            using (var db = DbConnection)
+            {
+                var c = db.CreateTable<T>();
+            }
+        }
+
+        /// <summary>
+        /// 插入数据
+        /// </summary>
+        /// <param name="item">插入值</param>
+        public void Insert(T item)
+        {
+            using (var db = DbConnection)
+            {
+                db.Insert(item);
+            }
+        }
+
+        /// <summary>
+        /// 插入数据
+        /// </summary>
+        /// <param name="item">插入值</param>
+        public void InsertAll(IEnumerable<T> list)
+        {
+            using (var db = DbConnection)
+            {
+                db.InsertAll(list);
+            }
+        }
+
+        /// <summary>
+        /// 删除数据
+        /// </summary>
+        /// <param name="item">删除值</param>
+        public void Delete(T item)
+        {
+            using (var db = DbConnection)
+            {
+                db.Delete(item);
+            }
+        }
+
+        /// <summary>
+        /// 更新数据
+        /// </summary>
+        /// <param name="item">更新值</param>
+        public void Update(T item)
+        {
+            using (var db = DbConnection)
+            {
+                db.Update(item);
+            }
+        }
+
+        /// <summary>
+        /// 查询所有数据
+        /// </summary>
+        /// <returns>表中所有数据</returns>
+        public List<T> QueryAll()
+        {
+            using (var db = DbConnection)
+            {
+                return db.Table<T>().ToList();
+            }
+        }
+    }
+}

SqliteDemo/SqliteDemo/Models/Person.cs

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+using System;
+using System.Collections.Generic;
+using System.Linq;
+using System.Text;
+
+using Android.App;
+using Android.Content;
+using Android.OS;
+using Android.Runtime;
+using Android.Views;
+using Android.Widget;
+using SQLite.Net.Attributes;
+
+namespace SqliteDemo.Models
+{
+    public class Person
+    {
+        [PrimaryKey, AutoIncrement]
+        public int ID { get; set; }
+
+        public string Name { get; set; }
+
+        public string Sex { get; set; }
+
+        public int Age { get; set; }
+    }
+}

SqliteDemo/SqliteDemo/Properties/AndroidManifest.xml

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+<?xml version="1.0" encoding="utf-8"?>
+<manifest xmlns:android="http://schemas.android.com/apk/res/android" 
+          package="SqliteDemo.SqliteDemo" 
+          android:versionCode="1" 
+          android:versionName="1.0">
+  <uses-sdk android:minSdkVersion="21" />
+  <application android:allowBackup="true" android:label="@string/app_name">
+  </application>
+</manifest>