希望我能正确理解您的问题。您在数据库中有现有的存储过程，例如dbo.spGetSomeData，它返回一些带有一些字段的项目列表，您需要从 Web API 方法提供数据。
实现可能如下。你可以定义一个 empty DbContext 像：
public class MyDbContext : DbContext
{
}
并使用数据库连接字符串定义appsettings.json
{
"Data": {
"DefaultConnection": {
"ConnectionString": "Server=(localdb)\\mssqllocaldb;Database=MyDb;Trusted_Connection=True;MultipleActiveResultSets=true"
}
}
}
您应该使用Microsoft.Extensions.DependencyInjection 将MyDbContext 添加到
public class Startup
{
// property for holding configuration
public IConfigurationRoot Configuration { get; set; }
public Startup(IHostingEnvironment env)
{
// Set up configuration sources.
var builder = new ConfigurationBuilder()
.AddJsonFile("appsettings.json")
.AddJsonFile($"appsettings.{env.EnvironmentName}.json", optional: true);
.AddEnvironmentVariables();
// save the configuration in Configuration property
Configuration = builder.Build();
}
// This method gets called by the runtime. Use this method to add services to the container.
public void ConfigureServices(IServiceCollection services)
{
// Add framework services.
services.AddMvc()
.AddJsonOptions(options => {
options.SerializerSettings.ContractResolver = new CamelCasePropertyNamesContractResolver();
});
services.AddEntityFramework()
.AddSqlServer()
.AddDbContext<MyDbContext>(options => {
options.UseSqlServer(Configuration["ConnectionString"]);
});
}
public void Configure(IApplicationBuilder app, IHostingEnvironment env, ILoggerFactory loggerFactory)
{
...
}
}
现在您可以按以下方式实现 WebApi 操作：
[Route("api/[controller]")]
public class MyController : Controller
{
public MyDbContext _context { get; set; }
public MyController([FromServices] MyDbContext context)
{
_context = context;
}
[HttpGet]
public async IEnumerable<object> Get()
{
var returnObject = new List<dynamic>();
using (var cmd = _context.Database.GetDbConnection().CreateCommand()) {
cmd.CommandText = "exec dbo.spGetSomeData";
cmd.CommandType = CommandType.StoredProcedure;
// set some parameters of the stored procedure
cmd.Parameters.Add(new SqlParameter("@someParam",
SqlDbType.TinyInt) { Value = 1 });
if (cmd.Connection.State != ConnectionState.Open)
cmd.Connection.Open();
var retObject = new List<dynamic>();
using (var dataReader = await cmd.ExecuteReaderAsync())
{
while (await dataReader.ReadAsync())
{
var dataRow = new ExpandoObject() as IDictionary<string, object>;
for (var iFiled = 0; iFiled < dataReader.FieldCount; iFiled++) {
// one can modify the next line to
// if (dataReader.IsDBNull(iFiled))
// dataRow.Add(dataReader.GetName(iFiled), dataReader[iFiled]);
// if one want don't fill the property for NULL
// returned from the database
dataRow.Add(
dataReader.GetName(iFiled),
dataReader.IsDBNull(iFiled) ? null : dataReader[iFiled] // use null instead of {}
);
}
retObject.Add((ExpandoObject)dataRow);
}
}
return retObject;
}
}
}
上面的代码只是使用exec dbo.spGetSomeData 执行并使用dataRader 读取所有结果并保存在dynamic 对象中。如果您从api/My 调用$.ajax，您将获得从dbo.spGetSomeData 返回的数据，您可以直接在JavaScript 代码中使用。上面的代码非常透明。 dbo.spGetSomeData 返回的数据集中的字段名称将是 JavaScript 代码中的属性名称。 您无需以任何方式管理 C# 代码中的任何实体类。您的 C# 代码没有从存储过程返回的字段名称。因此，如果您要扩展/更改 dbo.spGetSomeData 的代码（重命名一些字段，添加新字段），您只需要调整 JavaScript 代码，而不需要调整 C# 代码。