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'。所以在C#中,我使用Get操作创建Controller,如
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;
在小提琴手中获得以下错误
{"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."}
答案 0 :(得分:1)
您的Sql语句错误。
"SELECT * from LIMS_SAMPLE_RESULTS_VW where ROOM = " + ROOM +"and SUBMIT_DATE =" +"'"+SUBMITDATE+"'";
//--------------------------------no ticks-^----^ -no space--^
'
括起来,否则它就成了声明的一部分。 and
之间也没有空格。真正的解决方法是使用ROOM
和SUBMITDATE
的参数。这样做可以防止这样的问题开始发生。
我猜测参数类型,您可能需要纠正它们。
List<OracleParameter> prms = new List<OracleParameter>();
prms.Add(new OracleParameter("ROOM", OracleDbType.Varchar2, ROOM, ParameterDirection.Input));
prms.Add(new OracleParameter("SUBMITDATE", OracleDbType.Date, SUBMITDATE ?? System.DBNull.Value, ParameterDirection.Input));
// note that because you are using a nullable type as input you should pass in DBNull.Value as the value if the value is null in your c# code.
var strQuery = "SELECT * from LIMS_SAMPLE_RESULTS_VW where ROOM = :ROOM and SUBMIT_DATE = :SUBMITDATE";
您正在执行的字符串连接会使您的系统容易受到SQL注入攻击,并且会给您的sql代码带来问题。后者可以通过传入包含'
标记的值来说明。再做一次,你可以结束sql语句并在最后添加另一个。