C++ ADO.NET無法插入NULL值插入

Question

我試圖插入數據庫的一些線列，但在執行這個代碼，我得到了一個錯誤：

#using <mscorlib.dll> 
#using <System.dll> 
#using <system.data.dll> 
#using <System.Xml.dll> 

#include <sstream> 
#include <time.h> 
#include <string> 
#include <iostream> 
#include <tchar.h> 

using namespace System; 
using namespace System::Data; 
using namespace System::Xml; 
using namespace System::Data::SqlClient; 

// This is the entry point for this application 
int _tmain(void) 
{ 
    SqlConnection ^mySQLConnection; 
    SqlDataAdapter ^myDataAdapter; 
    DataSet   ^myDataSet; 
    DataRow   ^myRow; 
    SqlParameter  ^myParameter; 

    try 
    { 
     mySQLConnection = gcnew SqlConnection("Data Source=NECTARYS-PC;Initial Catalog=MonitoringN;Integrated Security=True;"); 
     myDataAdapter = gcnew SqlDataAdapter(); 
     myDataSet = gcnew DataSet(); 

     // Open up the connection 
     mySQLConnection->Open(); 

     myDataAdapter->SelectCommand = gcnew SqlCommand("select motif,dateAlerte,fixee,nomPoste," + 
     "nomApplication,nomFichier,FichierModel_id from Alerte", mySQLConnection); 

     myDataAdapter->InsertCommand = gcnew SqlCommand("insert into Alerte (motif,dateAlerte," + 
      "fixee,nomPoste,nomApplication,nomFichier,FichierModel_id) values (@motif,@dateAlerte," + 
      "@fixee,@nomPoste,@nomApplication,@nomFichier,@FichierModel_id)", mySQLConnection); 

     myParameter = myDataAdapter->InsertCommand->Parameters->Add(
      gcnew SqlParameter("@motif", SqlDbType::VarChar)); 
     myParameter->SourceColumn = "motif"; 
     myParameter->SourceVersion = DataRowVersion::Current; 

     myParameter = myDataAdapter->InsertCommand->Parameters->Add(
      gcnew SqlParameter("@dateAlerte", SqlDbType::VarChar)); 
     myParameter->SourceColumn = "dateAlerte"; 
     myParameter->SourceVersion = DataRowVersion::Current; 

     myParameter = myDataAdapter->InsertCommand->Parameters->Add(
      gcnew SqlParameter("@fixee", SqlDbType::Bit)); 
     myParameter->SourceColumn = "fixee"; 
     myParameter->SourceVersion = DataRowVersion::Current; 

     myParameter = myDataAdapter->InsertCommand->Parameters->Add(
      gcnew SqlParameter("@nomPoste", SqlDbType::VarChar)); 
     myParameter->SourceColumn = "nomPoste"; 
     myParameter->SourceVersion = DataRowVersion::Current; 

     myParameter = myDataAdapter->InsertCommand->Parameters->Add(
      gcnew SqlParameter("@nomApplication", SqlDbType::VarChar)); 
     myParameter->SourceColumn = "nomApplication"; 
     myParameter->SourceVersion = DataRowVersion::Current; 

     myParameter = myDataAdapter->InsertCommand->Parameters->Add(
      gcnew SqlParameter("@nomFichier", SqlDbType::VarChar)); 
     myParameter->SourceColumn = "nomFichier"; 
     myParameter->SourceVersion = DataRowVersion::Current; 

     myParameter = myDataAdapter->InsertCommand->Parameters->Add(
      gcnew SqlParameter("@FichierModel_id", SqlDbType::Int)); 
     myParameter->SourceColumn = "FichierModel_id"; 
     myParameter->SourceVersion = DataRowVersion::Current; 

     time_t now = time(0); 
     tm ltm; 
     localtime_s(&ltm,&now); 
     std::stringstream dateAjoutSysteme; 
     dateAjoutSysteme << ltm.tm_mday 
      << "/" 
      << 1 + ltm.tm_mon 
      << "/" 
      << 1900 + ltm.tm_year 
      << " " 
      << 1 + ltm.tm_hour 
      << ":" 
      << 1 + ltm.tm_min 
      << ":" 
      << 1 + ltm.tm_sec; 
     String^ str = gcnew System::String(dateAjoutSysteme.str().c_str()); 

     Boolean fixee = true; 

     myDataAdapter->Fill(myDataSet, "Alerte"); 
     myRow = myDataSet->Tables["Alerte"]->NewRow(); 
     myRow->ItemArray[0] = "A"; 
     myRow->ItemArray[1] = str; 
     myRow->ItemArray[2] = fixee; 
     myRow->ItemArray[3] = "B"; 
     myRow->ItemArray[4] = "C"; 
     myRow->ItemArray[5] = "D"; 
     myRow->ItemArray[6] = 0UL; 
     myDataSet->Tables["Alerte"]->Rows->Add(myRow); 

     //we use insertcommand property for the update. 
     myDataAdapter->Update(myDataSet, "Alerte"); 
    } 
    catch (Exception^e) { 
     Console::Write(e->ToString()); 
    } 
    __finally { 
     mySQLConnection->Close(); 
     system("PAUSE"); 
    } 
    return 0; 
} 

錯誤：

System.Data.SqlClient.SqlException（0x80131904）：無法將NULL值插入 列'fixee'，表'MonitoringN.dbo.Alerte'; 列不允許有空值。

有什麼好主意嗎？

Answer 1

你在Alerte上做了一個select *，所以你不知道列的順序......然後你根據列索引分配值......我想這是問題... fixee是可能不是第二列在myDataSet->表[「Alerte」]