使用参数在C#中插入查询
我试图使用下面的C#insert查询将几列插入到我的数据库中,但不知为什么它会在某个地方抛出异常,我猜没有为插入提供值。我只是想确认一下,看看如何修复insert语句。下面的图片显示了在运行时传递到参数中的内容。我用了一个断点来获取这个信息 需要你在这方面的专业知识…谢谢使用参数在C#中插入查询,c#,asp.net,C#,Asp.net,我试图使用下面的C#insert查询将几列插入到我的数据库中,但不知为什么它会在某个地方抛出异常,我猜没有为插入提供值。我只是想确认一下,看看如何修复insert语句。下面的图片显示了在运行时传递到参数中的内容。我用了一个断点来获取这个信息 需要你在这方面的专业知识…谢谢 if (Page.IsValid) { DateTime exhibitDate = DateTime.Now; int caseid = Convert.ToI
if (Page.IsValid)
{
DateTime exhibitDate = DateTime.Now;
int caseid = Convert.ToInt32(CaseIDDropDownList.SelectedItem.Text);
string exhibittype = exhibitTypeTextBox.Text.ToString();
string storedloc = storedLocationTextBox.Text.ToString();
string offid = DropDownList1.SelectedItem.Text.ToString();
Stream imgStream = exhibitImageFileUpload.PostedFile.InputStream;
int imgLen = exhibitImageFileUpload.PostedFile.ContentLength;
byte[] imgBinaryData = new byte[imgLen];
int n = imgStream.Read(imgBinaryData,0,imgLen);
try
{
SqlConnection connections = new SqlConnection(strConn);
SqlCommand command = new SqlCommand("INSERT INTO Exhibits (CaseID, ExhibitType, ExhibitImage, DateReceived, StoredLocation, InvestigationStatus, OfficerID, SuspectID, InvestigatorID, ManagerID, AdminID ) VALUES (@CaseID, @ExhibitType, @ExhibitImage, @DateReceived, @StoredLocation, @InvestigationStatus, @OfficerID, @SuspectID, @InvestigatorID, @ManagerID, @AdminID)", connections);
SqlParameter param0 = new SqlParameter("@CaseID", SqlDbType.Int);
param0.Value = caseid;
command.Parameters.Add(param0);
SqlParameter param1 = new SqlParameter("@ExhibitType", SqlDbType.NText);
param1.Value = exhibittype;
command.Parameters.Add(param1);
SqlParameter param2 = new SqlParameter("@ExhibitImage", SqlDbType.Image);
param2.Value = imgBinaryData;
command.Parameters.Add(param2);
SqlParameter param3 = new SqlParameter("@DateReceived", SqlDbType.SmallDateTime);
param3.Value = exhibitDate;
command.Parameters.Add(param3);
SqlParameter param4 = new SqlParameter("@StoredLocation", SqlDbType.NText);
param4.Value = storedloc;
command.Parameters.Add(param4);
SqlParameter param5 = new SqlParameter("@InvestigationStatus", SqlDbType.VarChar, 50);
param5.Value = "";
command.Parameters.Add(param5);
SqlParameter param6 = new SqlParameter("@OfficerID", SqlDbType.NChar, 10);
param6.Value = offid;
command.Parameters.Add(param6);
SqlParameter param7 = new SqlParameter("@SuspectID", SqlDbType.NChar, 10);
param7.Value = null;
command.Parameters.Add(param7);
SqlParameter param8 = new SqlParameter("@InvestigatorID", SqlDbType.NChar, 10);
param8.Value = null;
command.Parameters.Add(param8);
SqlParameter param9 = new SqlParameter("@ManagerID", SqlDbType.NChar, 10);
param9.Value = null;
command.Parameters.Add(param9);
SqlParameter param10 = new SqlParameter("@AdminID", SqlDbType.NChar, 10);
param10.Value = adminID;
command.Parameters.Add(param10);
connections.Open();
int numRowsAffected = command.ExecuteNonQuery();
connections.Close();
if (numRowsAffected != 0)
{
Response.Write("<BR>Rows Inserted successfully");
CaseIDDropDownList.ClearSelection();
exhibitTypeTextBox.Text = null;
storedLocationTextBox.Text = null;
DropDownList1.ClearSelection();
}
else
{
Response.Write("<BR>An error occurred uploading the image");
}
}
catch (Exception ex)
{
string script = "<script>alert('" + ex.Message + "');</script>";
}
if(Page.IsValid)
{
DateTime exhibitDate=DateTime.Now;
int caseid=Convert.ToInt32(CaseIDDropDownList.SelectedItem.Text);
字符串exhibittype=exhibitTypeTextBox.Text.ToString();
string storedloc=storedLocationTextBox.Text.ToString();
string offid=DropDownList1.SelectedItem.Text.ToString();
Stream imgStream=explamagefileupload.PostedFile.InputStream;
int imgLen=exbamagefileupload.PostedFile.ContentLength;
字节[]imgBinaryData=新字节[imgLen];
int n=imgStream.Read(imgBinaryData,0,imgLen);
尝试
{
SqlConnection连接=新的SqlConnection(strConn);
SqlCommand command=新的SqlCommand(“插入展品(案例ID、展览类型、展览图像、接收日期、存储位置、调查状态、OfficeId、怀疑、调查员ID、ManagerID、AdminID)”值(@CaseID、@exhibitype、@exhimage、@DateReceived、@StoredLocation、@InvestigationStatus、@OfficerID、@SuspectID、@investorid、@ManagerID、@AdminID)”,连接);
SqlParameter param0=新的SqlParameter(“@CaseID”,SqlDbType.Int);
param0.Value=caseid;
command.Parameters.Add(param0);
SqlParameter param1=新的SqlParameter(“@ExhibitType”,SqlDbType.NText);
参数1.值=参展商类型;
command.Parameters.Add(param1);
SqlParameter param2=新的SqlParameter(“@exbamage”,SqlDbType.Image);
param2.Value=imgBinaryData;
命令.Parameters.Add(param2);
SqlParameter param3=新的SqlParameter(“@DateReceived”,SqlDbType.SmallDateTime);
参数3.值=参展商日期;
command.Parameters.Add(param3);
SqlParameter param4=新的SqlParameter(“@StoredLocation”,SqlDbType.NText);
param4.Value=storedloc;
命令.Parameters.Add(param4);
SqlParameter param5=新的SqlParameter(“@InvestigationStatus”,SqlDbType.VarChar,50);
参数5.值=”;
命令.Parameters.Add(param5);
SqlParameter param6=新的SqlParameter(“@OfficeId”,SqlDbType.NChar,10);
param6.值=offid;
命令.Parameters.Add(param6);
SqlParameter param7=新的SqlParameter(“@SuspectID”,SqlDbType.NChar,10);
param7.Value=null;
命令.Parameters.Add(param7);
SqlParameter param8=新的SqlParameter(“@investorId”,SqlDbType.NChar,10);
param8.Value=null;
命令.Parameters.Add(param8);
SqlParameter param9=新的SqlParameter(“@ManagerID”,SqlDbType.NChar,10);
param9.Value=null;
命令.Parameters.Add(param9);
SqlParameter param10=新的SqlParameter(“@AdminID”,SqlDbType.NChar,10);
param10.Value=adminID;
命令.Parameters.Add(param10);
连接。打开();
int numrowsimpacted=command.ExecuteNonQuery();
连接。关闭();
如果(受影响的数值!=0)
{
写入(
行插入成功);
CaseIDDropDownList.ClearSelection();
exhibitTypeTextBox.Text=null;
storedLocationTextBox.Text=null;
DropDownList1.ClearSelection();
}
其他的
{
Write(
上传图像时出错);
}
}
捕获(例外情况除外)
{
string script=“警报(“+ex.Message+”);”;
}
例外情况如下
- $exception{“参数化查询”(@CaseID int、@ExhibitType ntext、@exbamage image、@DateReceive'需要未提供的参数“@SuspectID”。}System.exception{System.Data.SqlClient.SqlException}
您可以更轻松地执行此操作,可以这样尝试:
if (Page.IsValid)
{
DateTime exhibitDate = DateTime.Now;
int caseid = Convert.ToInt32(CaseIDDropDownList.SelectedItem.Text);
string exhibittype = exhibitTypeTextBox.Text.ToString();
string storedloc = storedLocationTextBox.Text.ToString();
string offid = DropDownList1.SelectedItem.Text.ToString();
Stream imgStream = exhibitImageFileUpload.PostedFile.InputStream;
int imgLen = exhibitImageFileUpload.PostedFile.ContentLength;
byte[] imgBinaryData = new byte[imgLen];
int n = imgStream.Read(imgBinaryData,0,imgLen);
try
{
SqlConnection connections = new SqlConnection(strConn);
SqlCommand command = new SqlCommand("INSERT INTO Exhibits (CaseID, ExhibitType, ExhibitImage, DateReceived, StoredLocation, InvestigationStatus, OfficerID, SuspectID, InvestigatorID, ManagerID, AdminID ) VALUES (@CaseID, @ExhibitType, @ExhibitImage, @DateReceived, @StoredLocation, @InvestigationStatus, @OfficerID, @SuspectID, @InvestigatorID, @ManagerID, @AdminID)", connections);
command.Parameters.AddWithValue("@CaseID", caseid);
//and so on for your 10 parameters
connections.Open();
int numRowsAffected = command.ExecuteNonQuery();
connections.Close();
if (numRowsAffected != 0)
{
Response.Write("<BR>Rows Inserted successfully");
CaseIDDropDownList.ClearSelection();
exhibitTypeTextBox.Text = null;
storedLocationTextBox.Text = null;
DropDownList1.ClearSelection();
}
else
{
Response.Write("<BR>An error occurred uploading the image");
}
}
catch (Exception ex)
{
string script = "<script>alert('" + ex.Message + "');</script>";
}
}
if(Page.IsValid)
{
DateTime exhibitDate=DateTime.Now;
int caseid=Convert.ToInt32(CaseIDDropDownList.SelectedItem.Text);
字符串exhibittype=exhibitTypeTextBox.Text.ToString();
string storedloc=storedLocationTextBox.Text.ToString();
string offid=DropDownList1.SelectedItem.Text.ToString();
Stream imgStream=explamagefileupload.PostedFile.InputStream;
int imgLen=exbamagefileupload.PostedFile.ContentLength;
字节[]imgBinaryData=新字节[imgLen];
int n=imgStream.Read(imgBinaryData,0,imgLen);
尝试
{
SqlConnection连接=新的SqlConnection(strConn);
SqlCommand command=新的SqlCommand(“插入展品(案例ID、展览类型、展览图像、接收日期、存储位置、调查状态、OfficeId、怀疑、调查员ID、ManagerID、AdminID)”值(@CaseID、@exhibitype、@exhimage、@DateReceived、@StoredLocation、@InvestigationStatus、@OfficerID、@SuspectID、@investorid、@ManagerID、@AdminID)”,连接);
command.Parameters.AddWithValue(“@CaseID”,CaseID);
//a
SqlParameter param9 = new SqlParameter("@ManagerID", SqlDbType.NChar, 10);
param9.Value = DBNull.Value;
command.Parameters.Add(param9);