C# WPF 桌面应用程序使用 SQlite 数据库

        我们在开发 WPF 桌面应用程序时，数据库存的使用是必不可少的，除非你的应用没有数据存储的需求，有了数据存储需求，我们就会面临使用什么样的数据库的选择问题，我的选择方案是，单机版的应用我优先选择 Sqlite，如果钓多台电脑需要数据共享我优先MySql 8.0+，Sqlite 和MySql 都支持标准的SQL 结构查询语句，数据库的切换也不需要额外大量的开发工作。单机版使用Sqlite ，免去 MySql 安装过程，减少用户的操作，降低使用门槛。

        之前的很多应用都是使用 MySql 。现在记录下对 Sqlite 数据的基本使用。

准备两张表和C# 实体类，代码如下

   public class BaseEntity
    {
        public Int64 id;
        public Int64 Id
        {
            get
            {
                return id;
            }
            set
            {
                id = value;
            }
        }
    }

    //车辆作息
    public class Car : BaseEntity
    {
 
        public string carNumber;
        public decimal traeWeight;
        public string driver;
        public string driverMobile;
 
    }

    //货物信息 Material   
    public class Marteral :BaseEntity
    {
        public string name;
        public string firstCase;
    }

 

对应的表结构

CREATE TABLE "main"."marteral" (
"id"  INTEGER NOT NULL,
"name"  TEXT(255) DEFAULT NULL,
"first_case"  TEXT(255) DEFAULT NULL,
PRIMARY KEY ("id" ASC)
);
 
CREATE TABLE "main"."car" (
"id"  bigint NOT NULL,
"car_number"  TEXT(255) DEFAULT NULL,
"trae_weight"  real(10,3) DEFAULT '0.000',
"driver"  TEXT(255) DEFAULT NULL,
"driver_mobile"  TEXT(255) DEFAULT NULL,
"driver_idnumber"  TEXT(255) DEFAULT NULL,
PRIMARY KEY ("id" ASC)
)
;

第一步 在Nuget中 引入 Sqlite的库。

的代码中引入 命名空间

using System.Data;
using Microsoft.Data.Sqlite;

第二步 连接Sqlite。

构建连接字符串

       /// 
        /// 
        /// 
        /// sqlite databases file 
        /// 
        private static string GetConnString(string file)
        {
            var connStr = new SqliteConnectionStringBuilder()
            {
                DataSource = file,
                Pooling = true,
                // 注意 Mode的值 ， SqliteOpenMode.ReadWriteCreate表示不存在文件时
                //会自动创建
                Mode = SqliteOpenMode.ReadWriteCreate,
            }.ConnectionString;
 
            return connStr;
        }

连接

      public bool Connection()
        {
            bool res = false;
            //db file is not exist,
            using (SqliteConnection connection = new SqliteConnection(GetConnString(dbfile)))
            {
                if (connection.State != ConnectionState.Open)
                {
 
                    connection.Open();
                    res = connection.State == ConnectionState.Open;
                }
            }
 
            return res;
        }

第三步  使用。

        添加数据

        //各添加10万条数
        private void InsertBtn_Click(object sender, RoutedEventArgs e)
        {
            int total = 100000;
 
            for (int i = 0; i < total; i++)
            {
                Marteral m = new Marteral()
                {
                    id = i+1,
                    name = "原煤"+i,
                    firstCase = "YM"+i,
                };
                int res = -1;
                if(i% 2 == 0)
                {
                    string sql = SqlBuilder.GetInsertSql(m);
 
                     res = SqliteHelper.Instance.Insert(sql);
                }
                else
                {
                     res = SqliteHelper.Instance.Insert(m);
                }
               if(res >= 0)
                {
                    Debug.WriteLine($"{m.name} inseert successed;");
                }
                else
                {
                    Debug.WriteLine($"{m.name} inseert errored;");
                }
            }
 
            for (int i = 0; i < total; i++)
            {
                Car c= new Car()
                {
                    id = i+1,
                    carNumber = "云DDD73" + i,
                    driver = "驾驶员" + i,
                    driverMobile = "1580874631" +i,
                };
                int res = -1;
                if (i % 2 == 0)
                {
                    string sql = SqlBuilder.GetInsertSql(c);
 
                    res = SqliteHelper.Instance.Insert(sql);
                }
                else
                {
                    res = SqliteHelper.Instance.Insert(c);
                }
                if (res >= 0)
                {
                    Debug.WriteLine($"{c.carNumber} inseert successed;");
                }
                else
                {
                    Debug.WriteLine($"{c.carNumber} inseert errored;");
                }
            }
        }

        修改数据

 
        private void UpdateBtn_Click(object sender, RoutedEventArgs e)
        {
            for (int i = 0; i < 5; i++)
            {
                Marteral m = new Marteral()
                {
                    id = i + 1,
                    name = "精煤煤" + i,
                    firstCase = "JM" + i,
                };
                int res = -1;
                if (i % 2 == 0)
                {
                    string sql = SqlBuilder.GetUpdateSql(m);
 
                    res = SqliteHelper.Instance.Update(sql);
                }
                else
                {
                    res = SqliteHelper.Instance.Update(m);
                }
                if (res >= 0)
                {
                    Debug.WriteLine($"{m.name} Update successed;");
                }
                else
                {
                    Debug.WriteLine($"{m.name} Update errored;");
                }
            }
 
            for (int i = 0; i < 5; i++)
            {
                Car c = new Car()
                {
                    id = i + 1,
                    carNumber = "云AAA73" + i,
                    driver = "驾驶员" + i,
                    driverMobile = "1580874631" + i,
                };
                int res = -1;
                if (i % 2 == 0)
                {
                    string sql = SqlBuilder.GetUpdateSql(c);
 
                    res = SqliteHelper.Instance.Update(sql);
                }
                else
                {
                    res = SqliteHelper.Instance.Update(c);
                }
                if (res >= 0)
                {
                    Debug.WriteLine($"{c.carNumber} Update successed;");
                }
                else
                {
                    Debug.WriteLine($"{c.carNumber} Update errored;");
                }
            }
        }

        删除数据

        

// id % 2 == 0 的数据删除  
private void DeleteBtn_Click(object sender, RoutedEventArgs e)
        {
            for (int i = 0; i < 5; i++)
            {
                Marteral m = new Marteral()
                {
                    id = i + 1,
                    name = "精煤煤" + i,
                    firstCase = "JM" + i,
                };
                int res = -1;
                if (i % 2 == 0)
                {
                    string sql = SqlBuilder.GetDeleteSql(m);
 
                    res = SqliteHelper.Instance.Delete(sql);
                }
              
                if (res >= 0)
                {
                    Debug.WriteLine($"{m.name} Delete successed;");
                }
                else
                {
                    Debug.WriteLine($"{m.name} Delete errored;");
                }
            }
 
            for (int i = 0; i < 5; i++)
            {
                Car c = new Car()
                {
                    id = i + 1,
                    carNumber = "云AAA73" + i,
                    driver = "驾驶员" + i,
                    driverMobile = "1580874631" + i,
                };
                int res = -1;
                if (i % 2 == 0)
                {
                    string sql = SqlBuilder.GetDeleteSql(c);
 
                    res = SqliteHelper.Instance.Delete(sql);
                }
              
                if (res >= 0)
                {
                    Debug.WriteLine($"{c.carNumber} Delete successed;");
                }
                else
                {
                    Debug.WriteLine($"{c.carNumber} Delete errored;");
                }
            }
        }

查询并在日志在打印内容

      private void SelectBtn_Click(object sender, RoutedEventArgs e)
        {
            string sql = SqlBuilder.GetSelectSql("car", "", "");
            List cars = SqliteHelper.Instance.Select(sql);
            cars.ForEach((c) => { Debug.WriteLine(c.carNumber+" trae:"+c.traeWeight); });
 
            string sql2 = SqlBuilder.GetSelectSql("marteral", "", "");
            List ms = SqliteHelper.Instance.Select(sql2);
            ms.ForEach((m) => { Debug.WriteLine(m.name); });
        }
 

最后

代码仓库：sqlite_demo: C# WPF 桌面应用程序，数据存储使用Sqlite ，这是一个数据基本操作的基本Demo

感谢各位朋友的阅读，有不足之处，望指正。