我正在使用四个输入参数创建Web API。输入参数将在Select语句的where子句中使用。Oracle中的字段为ROOM (Varchar),SUBMIT_DATE(Date)(eg:01-JAN-16)
。 URL应该是`/ api/TGSSampleDatas?Room = 654 & SUBMITDATE = '01 -Jan-16'。因此,在C#中,我创建与获取动作控制器像获取输入参数以查询Oracle数据库的Web API
public class TGSSampleDatasController : ApiController
{
[HttpGet]
public HttpResponseMessage Getdetails(string ROOM,DateTime ? SUBMITDATE = null)
{
List<OracleParameter> prms = new List<OracleParameter>();
List<string> selectionStrings = new List<string>();
string connStr = ConfigurationManager.ConnectionStrings["TGSDataConnection"].ConnectionString;
using (OracleConnection dbconn = new OracleConnection(connStr))
{
DataSet userDataset = new DataSet();
var strQuery = "SELECT * from LIMS_SAMPLE_RESULTS_VW where ROOM = " + ROOM +"and SUBMIT_DATE =" +"'"+SUBMITDATE+"'";
var returnObject = new { data = new OracleDataTableJsonResponse(connStr, strQuery, prms.ToArray()) };
var response = Request.CreateResponse(HttpStatusCode.OK, returnObject, MediaTypeHeaderValue.Parse("application/json"));
ContentDispositionHeaderValue contentDisposition = null;
if (ContentDispositionHeaderValue.TryParse("inline; filename=TGSData.json", out contentDisposition))
{
response.Content.Headers.ContentDisposition = contentDisposition;
}
return response;
提示以下错误:在提琴手 {"Message":"The request is invalid.","MessageDetail":"The parameters dictionary contains a null entry for parameter 'SUBMITDATE' of non-nullable type 'System.DateTime' for method 'System.Net.Http.HttpResponseMessage Getdetails(System.String, System.DateTime)' in 'TGSSampleData.Controllers.TGSSampleDatasController'. An optional parameter must be a reference type, a nullable type, or be declared as an optional parameter."}
重复的问题,你可以在这里找到解决方案:http://stackoverflow.com/questions/11862069/optional-parameters-in-asp-net-web-api – Turrican
@Div当我尝试/ api/TGSSampleDatas?房间= 654&SUBMITDATE = 01-Jan-16错误说'在Oracle.ManagedDataAccess.dll中发生类型'Oracle.ManagedDataAccess.Client.OracleException'的异常,但未在用户代码中处理' – trx
这不是实际的错误,请看你的堆栈跟踪。 –