UWP SQLite的使用

来源：互联网发布：知原药业编辑：程序博客网时间：2024/06/07 11:22

1.准备工作

1.首先我们要给项目添加“SQLite for Universal Windows Platform”扩展

点击菜单栏的“工具”-“扩展和更新”，然后在“联机”中搜索

2.安装扩展后我们再添加“SQLite.Net-PCL ”的Nuget程序包

在解决方案管理器中右击项目的“引用”，打开“管理Nuget程序包管理”，在“浏览”中搜索并安装

现在已经准备完成了，可以开始使用了。

2.使用

先定义一个数据模板，接下来会用到（这里需要"using SQLite.Net.Attributes;"）

public class DataTemple{    [PrimaryKey, AutoIncrement]    public int Id { get; set; }     //主键    public string Name { get; set; }    public string Age { get; set; }}

1.建立数据库

string path = Path.Combine(ApplicationData.Current.LocalFolder.Path, "mydb.sqlite");SQLiteConnection conn = new SQLiteConnection(new SQLitePlatformWinRT(), path);

2.建表

conn.CreateTable<DataTemple>(); //默认表名同范型参数  //以下等效上面  //conn.CreateTable(typeof(DataTemple));

3.增

增一条：

conn.Insert(new DataTemple(){   Name = textBox.Text, Age = textBox1.Text });

增一堆：

List<DataTemple> dataTemples=new List<DataTemple>();dataTemples.Add(……);//添加若干项……conn.InsertAll(dataTemples);

4.删

删一条：

conn.Execute("delete from DataTemple where Name = ?", name);

全删：

conn.DeleteAll<DataTemple>();

5.查

按条件查询（name是string变量）：

方法1：

List<DataTemple> query = conn.Table<DataTemple>().Where(v => v.Name == name).ToList();

方法2：

List<DataTemple> query = conn.Query<DataTemple>("select * from DataTemple where Name = ?", name);

查询全部：

方法1：

List<DataTemple> query = conn.Table<DataTemple>().ToList();

方法2：

List<DataTemple> query = conn.Query<DataTemple>("select * from DataTemple");

3.Demo

界面：

<Page    x:Class="Sqlite.MainPage"    xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"    xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"    xmlns:local="using:Sqlite"    xmlns:d="http://schemas.microsoft.com/expression/blend/2008"    xmlns:mc="http://schemas.openxmlformats.org/markup-compatibility/2006"    mc:Ignorable="d">    <Grid Background="{ThemeResource ApplicationPageBackgroundThemeBrush}">                <StackPanel HorizontalAlignment="Center" VerticalAlignment="Center">            <Button x:Name = "Add" Content = "添加" Width="80" Margin="0,10,0,0"                    Click = "Add_Click" HorizontalAlignment="Center"/>            <Button Name="Select" Content="按名查询" Width="80" Margin="0,10,0,0"                    Click = "Select_Click" HorizontalAlignment="Center"/>            <Button x:Name = "Retrieve" Content = "查询全部"  Width="80" Margin="0,10,0,0"                    Click = "Retrieve_Click" HorizontalAlignment="Center"/>            <Button Name="Del" Content="按名删除" Width="80" Margin="0,10,0,0"                    Click = "Del_Click" HorizontalAlignment="Center"/>            <Button Name="DelAll" Content="全删" Width="80" Margin="0,10,0,0"                    Click = "DelAll_Click" HorizontalAlignment="Center"/>            <TextBlock x:Name = "textBlock" TextWrapping = "Wrap"                        Text = "Name" Width = "100"/>            <TextBox x:Name = "textBox" TextWrapping = "Wrap" Width = "100"/>            <TextBlock x:Name = "textBlock1" TextWrapping = "Wrap"                        Text = "Age" Width = "100"/>            <TextBox x:Name = "textBox1" TextWrapping = "Wrap" Width = "100"/>            <TextBlock x:Name = "textBlock2" TextWrapping = "Wrap"                        Width = "324" Margin="10"/>        </StackPanel>            </Grid></Page>

逻辑：

using System.Collections.Generic;  using System.IO;  using System.Linq;  using SQLite.Net;  using SQLite.Net.Platform.WinRT;  using Windows.Storage;  using Windows.UI.Xaml;  using Windows.UI.Xaml.Controls;    //“空白页”项模板在 http://go.microsoft.com/fwlink/?LinkId=402352&clcid=0x409 上有介绍    namespace Sqlite  {      /// <summary>      /// 可用于自身或导航至 Frame 内部的空白页。      /// </summary>      public sealed partial class MainPage : Page      {          string path = Path.Combine(ApplicationData.Current.LocalFolder.Path, "mydb.sqlite");    //建立数据库          SQLiteConnection conn;            public MainPage()          {              this.InitializeComponent();              //建立数据库连接              conn = new SQLiteConnection(new SQLitePlatformWinRT(), path);              //建表              conn.CreateTable<DataTemple>(); //默认表名同范型参数              //以下等效上面的建表              //conn.CreateTable(typeof(DataTemple));          }            //查询所有          private void Retrieve_Click(object sender, RoutedEventArgs e)          {              textBlock2.Text = "";              List<DataTemple> datalist = conn.Query<DataTemple>("select * from DataTemple");                /////////下面跟上面等效////////////////              //List<DataTemple> datalist = conn.Table<DataTemple>().ToList();                foreach (var item in datalist)              {                  textBlock2.Text += item.Id + " " + item.Name + " " + item.Age + "\n";              }          }            //添加一个记录          private void Add_Click(object sender, RoutedEventArgs e)          {              conn.Insert(new DataTemple() { Name = textBox.Text, Age = textBox1.Text });          }            //删除一项          private void Del_Click(object sender, RoutedEventArgs e)          {              conn.Execute("delete from DataTemple where Name = ?", textBox.Text);          }            //查询          private void Select_Click(object sender, RoutedEventArgs e)          {              textBlock2.Text = "";              List<DataTemple> datalist = conn.Query<DataTemple>("select * from DataTemple where Name = ?", textBox.Text);                //////////////下面的也是查询////////////////////              //List<DataTemple> datalist = conn.Table<DataTemple>().Where(v => v.Name==name).ToList();                foreach (var item in datalist)              {                  textBlock2.Text += item.Id + " " + item.Name + " " + item.Age + "\n";              }          }            //删除全部记录          private void DelAll_Click(object sender, RoutedEventArgs e)          {              conn.DeleteAll<DataTemple>();          }      }  }

界面：

参考资料：Windows 10 Development - SQLite Database

https://github.com/oysteinkrog/SQLite.Net-PCL （在test分支里面有示例代码）

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