文章主要内容翻译自Awesh Vishwakarma的博文文字“SQLite with C#.Net and Entity Framework”。博客地址为点击打开链接，侵删。
IDE：VS2017
1. 安装SQLite
NuGet 命令安装SQLite：PM> Install-Package System.Data.SQLite。或NuGet中搜索“sqlite”安装。如下图。
安装成功App.config(或Web.config)中有如下配置信息
-
<startup>
-
<supportedRuntime version="v4.0" sku=".NETFramework,Version=v4.0,Profile=Client" />
-
startup>
2. 下载安装SQLite Expert Personal 4.2
SQLite Expert是SQLite的可视化工具。下载地址为：点击打开链接。在SQLite Expert中新建数据库(文件格式为.db或sqlite)，并建表。可使用下方的测试SQL语句粘贴至SQLite Expert中执行。
-
CREATE
TABLE EmployeeMaster (
-
-
ID
INTEGER PRIMARY
KEY AUTOINCREMENT
-
-
UNIQUE,
-
-
EmpName
VARCHAR
NOT
NULL,
-
-
Salary
DOUBLE
NOT
NULL,
-
-
Designation
VARCHAR
NOT
NULL
-
-
);
3. 将.db文件复制到项目中
将.db文件复制到项目的对应目录中。在文件的属性中“Copy to Output Directory”选择复制。
4. 写相关类代码
4.1 创建SQLite数据库配置类SQLiteConfiguration.cs
-
using System;
-
using System.Collections.Generic;
-
using System.Data.Entity;
-
using System.Data.Entity.Core.Common;
-
using System.Data.SQLite;
-
using System.Data.SQLite.EF6;
-
using System.Linq;
-
using System.Text;
-
using System.Threading.Tasks;
-
-
namespace
SQLiteWithEF
-
{
-
public
class
SQLiteConfiguration :
DbConfiguration
-
{
-
public SQLiteConfiguration()
-
{
-
SetProviderFactory(
"System.Data.SQLite", SQLiteFactory.Instance);
-
SetProviderFactory(
"System.Data.SQLite.EF6", SQLiteProviderFactory.Instance);
-
SetProviderServices(
"System.Data.SQLite", (DbProviderServices)SQLiteProviderFactory.Instance.GetService(
typeof(DbProviderServices)));
-
}
-
}
-
}
4.2 写实体类（以EmployeeMaster为例）
-
using System;
-
using System.Collections.Generic;
-
using System.ComponentModel.DataAnnotations;
-
using System.Data.Entity;
-
using System.Data.Entity.ModelConfiguration.Conventions;
-
using System.Data.Linq.Mapping;
-
using System.Data.SQLite;
-
using System.Diagnostics;
-
using System.Linq;
-
using System.Text;
-
using System.Threading.Tasks;
-
-
namespace
SQLiteWithEF
-
{
-
[
Table(Name = "EmployeeMaster")]
-
public
class
EmployeeMaster
-
{
-
[
Column(Name = "ID", IsDbGenerated = true, IsPrimaryKey = true, DbType = "INTEGER")]
-
[
Key]
-
public
int ID {
get;
set; }
-
-
[
Column(Name = "EmpName", DbType = "VARCHAR")]
-
public
string EmpName {
get;
set; }
-
-
[
Column(Name = "Salary", DbType = "DOUBLE")]
-
public
double Salary {
get;
set; }
-
-
[
Column(Name = "Designation", DbType = "VARCHAR")]
-
public
string Designation {
get;
set; }
-
}
-
}
4.3 新建类似于DbContext的类DataBaseContext
-
using System;
-
using System.Collections.Generic;
-
using System.Data.Entity;
-
using System.Data.Entity.ModelConfiguration.Conventions;
-
using System.Data.SQLite;
-
using System.IO;
-
using System.Linq;
-
using System.Text;
-
using System.Threading.Tasks;
-
using BoilerCalculator.Entity.CarbonOxidationRate;
-
-
namespace
BoilerCalculator.EntityFramwork
-
{
-
class
DatabaseContext :
DbContext
-
{
-
public DatabaseContext() : base(new SQLiteConnection() {
-
ConnectionString =
new SQLiteConnectionStringBuilder()
-
{
-
DataSource = Path.Combine(AppDomain.CurrentDomain.BaseDirectory,
"Db\\BoilerCalculator.db"),
-
ForeignKeys =
true
-
}.ConnectionString
-
},
true)
-
{
-
-
-
}
-
protected override void OnModelCreating(DbModelBuilder modelBuilder)
-
{
-
modelBuilder.Conventions.Remove
();
-
base.OnModelCreating(modelBuilder);
-
}
-
-
-
public DbSet
EmployeeMaster {
get;
set; }
-
}
-
}
至此所有配置、数据库连接类已完毕，可在其他类中使用DataBaseContext做类似于EntityFramework对数据库的Lambda Linq操作。以下以Program为例。
-
using System;
-
using System.Collections.Generic;
-
using System.Linq;
-
using System.Text;
-
using System.Threading.Tasks;
-
-
namespace
SQLiteWithEF
-
{
-
class
Program
-
{
-
static void Main(string[] args)
-
{
-
DatabaseContext context =
new DatabaseContext();
-
Console.WriteLine(
"Enter Employee name");
-
string name = Console.ReadLine();
-
Console.WriteLine(
"Enter Salary");
-
double salary = Convert.ToDouble(Console.ReadLine());
-
Console.WriteLine(
"Enter Designation");
-
string designation = Console.ReadLine();
-
EmployeeMaster employee =
new EmployeeMaster()
-
{
-
EmpName = name,
-
Designation = designation,
-
Salary = salary
-
};
-
context.EmployeeMaster.Add(employee);
-
context.SaveChanges();
-
-
var data = context.EmployeeMaster.ToList();
-
foreach (
var item
in data)
-
{
-
Console.Write(
string.Format(
"ID : {0} Name : {1} Salary : {2} Designation : {3}{4}", item.ID, item.EmpName, item.Salary, item.Designation, Environment.NewLine));
-
}
-
-
Console.ReadKey();
-
}
-
}
-
}
Unable to load DLL 'SQLite.Interop.dll': The specified module could not be found. (Exception from HR...
72
收藏
在主工程（ASP.NET WEB/WCF等）的NuGet里引用 System.Data.SQLite.Core
不仅仅是Service需要引用，主工程即使不直接使用SQLite的库，也需要引用。
若使用IIS，保证应用程序池的ApplicationPoolIdentity对程序目录及其下的x64与x86文件内的SQLite.Interop.dll文件有以下权限：
Read
Read and Execute
转载于:https://www.cnblogs.com/lionetchen/p/10184935.html