小巧的sql查询动态参数

Question

在我的asp.net web-api中，从下面的代码片段中得到错误为“ORA-00936：missing expression”。我曾尝试过很多解决方案，但我没有克服这个错误。而且我想知道如何动态绑定多个参数。我使用oracle作为我的后端和精巧的我的ORM。

 string empId = json.EMPID; //'15RD005' 

     var sql = @"Select id_no,SNO,REASON,APPLIEDDATE,Case 
        when LEAVE_TYPE = 0 then 'CL' 
        when LEAVE_TYPE = 1 then 'EL' 
        when LEAVE_TYPE = 2 then 'SL' 
        when LEAVE_TYPE = 3 then 'OFF' 
        when LEAVE_TYPE = 4 then 'OD-OFF' 
        when LEAVE_TYPE = 5 then 'LOP' 
        when LEAVE_TYPE = 6 then 'OPTIONAL' end LEAVE_TYPE, 
       to_char(fromdate,'DD-MON-YYYY') f_date, to_char(todate,'DD-MON-YYYY') t_date, 
        Case when fromslot=0 then 'First-Half' when fromslot=1 then 'Second-Half' when fromslot=2 then 'Full-Day' end From_Slot, 
        Case when toslot=0 then 'First-Half' when toslot=1 then 'Second-Half' when toslot=2 then 'Full-Day' end To_Slot, 
       applieddays APP_DAYS, 
        case when actinact=0 and cancel_idno is not null then 'Cancelled' 
        when actinact=1 and AUTH_IDNO is null then 'Pending' 
        when actinact=0 and cancel_idno is not null then 'Rejected' 
        else 'Authorised' end leave_Status 
       from Tleaves where to_char(Todate,'mm-yyyy') >= to_char(sysdate-30,'mm-yyyy') and to_char(todate,'mm-yyyy') <=to_char(sysdate,'mm-yyyy') 
       and to_char(Todate,'yyyy')=to_char(sysdate,'yyyy') and id_no like @EmpId Order by sno"; 



     try 
     { 
      using (OracleConnection db = new OracleConnection(conString)) 
      { 
       db.Open(); 

       var pastLeavesReport = new PastLeavesReportDTO(); 
       //3.Present and last month lev status report 
       List<PastLeavesReportInfoDTO> pastLeavesReportInfo = db.Query<PastLeavesReportInfoDTO>(sql, new { EmpId = empId }).ToList(); 

       pastLeavesReport.EMPID = ""; 
       pastLeavesReport.LEAVES = pastLeavesReportInfo; 


       return Ok(
       new EmpLeavesActionResponse(ActionStatusCodes.PastLeavesReportDataFound, 
           "", 
           pastLeavesReport)); 


      } 
     } 
     catch (Exception exp) 
     { 

      return Ok(
       new EmpLeavesActionResponse(ActionStatusCodes.ServerException, 
           exp.Message, 
           null)); 

     } 

Answer 1

最后我解决了我的代码变化不大，我的问题。这就是@Empid变成：Empid，因为oracle数据库以这种方式支持动态参数。而对于我的第二个问题是如何与多个动态参数，我使用dappers DynamicParameters类处理，如下图所示，

 var parameters = new Dictionary<string, object>(); 
     parameters.Add("ID", empId); 

     DynamicParameters dbParams = new DynamicParameters(); 
     dbParams.AddDynamicParams(parameters); 

而且我们可以在短小精悍的使用如下图所示的代码snippe， 参数查询是示例sql查询。

  dynamic result = db.Query(query, dbParams); 

Answer 2

所以，你有一个逻辑问题就在这里，因为actinact = 0，cancel_idno不为空列出了两次

注意，这可能是错误

case 
    when actinact=0 and cancel_idno is not null then 'Cancelled' 
    when actinact=1 and AUTH_IDNO is null then 'Pending' 
    when actinact=0 and cancel_idno is not null then 'Rejected' 
    else 'Authorised' 
end leave_Status 

：这很容易当代码被很好地格式化时。

---

你说要两个参数只是添加然后在新的对象

new { EmpId = empId } 

成为

new { EmpId = empId, 
     newparam = newvalue }) 

，然后在查询中使用@newparam。

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