好的，所以我编写了代码来使用Itextsharp和select语句中的变量制作PDF文件。并更新到数据库中。读者必须使用我所做的查询返回多个结果。由于某种原因，它在第一个结果后停止。
任何人都可以告诉我需要更改的内容，使其遍历已返回的每一行并将其更新到while循环中的数据库。
这是我的代码。
public Form1()
{
InitializeComponent();
}
private void CreateBtn_Click(object sender, EventArgs e)
{
try
{
make_pdf();
MessageBox.Show("completed");
}
catch (Exception exe )
{
MessageBox.Show("failed");
}
}
public void vaiabless()
{
}
public static void make_pdf()
{
string Contact = "";
string emailAddress = "";
string Tel = "";
string InvoiceDate = "";
string address = "";
string Reference = "";
string AccountNo = "";
string Debit = "";
string Credit = "";
string refnum = "";
string transtype = "";
string breaker = "|";
string connetionString = null;
MySqlConnection cnn;
connetionString = "*************";
cnn = new MySqlConnection(connetionString);
try
{
cnn.Open();
// MessageBox.Show("Connection Open ! ");
}
catch (Exception ex)
{
MessageBox.Show("Can not open connection ! ");
}
try
{
MySqlDataReader reader = null;
string selectCmd = "SELECT accounting.code,users.curr_email , users.physicaddr ,accounting.date , accounting.refnum , accounting.transtype, users.telephone , accounting.debit , accounting.acc_pdf, accounting.credit, accounting.reference, users.contact, accounting.transnum FROM accounting INNER JOIN users ON accounting.code = users.code WHERE(accounting.transtype = 1)";
MySqlCommand createcommand = new MySqlCommand(selectCmd, cnn);
reader = createcommand.ExecuteReader();
while (reader.Read())
{
if (reader.HasRows)
{
//get account number
AccountNo = reader["code"].ToString();
//get emailaddress
emailAddress = reader["curr_email"].ToString();
transtype = reader["transtype"].ToString();
//get Contact Name
Contact = reader["contact"].ToString();
//get telephone number
Tel = reader["telephone"].ToString();
//Get Date
InvoiceDate = reader["date"].ToString();
//Get reference
Reference = reader["reference"].ToString();
//Get Address
address = reader["physicaddr"].ToString();
//Get Debit
Debit = reader["debit"].ToString();
//Get Credit
Credit = reader["credit"].ToString();
//Get Refnum
refnum = reader["refnum"].ToString();
MemoryStream ms = new MemoryStream();
byte[] bits = new byte[0];
// Make The PDF File
Document NewDoc = new Document(iTextSharp.text.PageSize.A4, 0, 0, 0, 0);
PdfWriter pdfwri = PdfWriter.GetInstance(NewDoc,ms);
NewDoc.Open();
iTextSharp.text.Image img = iTextSharp.text.Image.GetInstance("intsa-header.jpg");
img.ScaleAbsolute(596f, 100f);
//Account List
List AccountNolist = new List(List.UNORDERED);
AccountNolist.SetListSymbol("");
AccountNolist.IndentationLeft = 300f;
AccountNolist.Add(new ListItem("AccountNo " + AccountNo));
// AddressList
List AddressList = new List(List.UNORDERED);
AddressList.SetListSymbol("");
AddressList.IndentationLeft = 300f;
AddressList.Add(new ListItem("Address: " + address));
#region Emailaddresslist
//EmailAddressList
List emailAddresslist = new List(List.UNORDERED);
emailAddresslist.SetListSymbol("");
emailAddresslist.IndentationLeft = 300f;
emailAddresslist.Add(new ListItem("Email address: " + emailAddress));
#endregion
//ContactList
List Contactlist = new List(List.UNORDERED);
Contactlist.SetListSymbol("");
Contactlist.IndentationLeft = 300f;
Contactlist.Add(new ListItem("Contact: " + Contact));
//TelephoneList
List Telephonelist = new List(List.UNORDERED);
Telephonelist.SetListSymbol("");
Telephonelist.IndentationLeft = 300f;
Telephonelist.Add(new ListItem("Tel: " + Tel));
// Make a Table
#region pdftable
//PdfPTable General_Table = new PdfPTable(1);
//General_Table.SpacingBefore = 50f;
//General_Table.SpacingAfter = 50f;
//PdfPCell Caption = new PdfPCell(new Phrase("Description"));
//PdfPCell Body = new PdfPCell(new Phrase(" " + refnum + " "+ Reference + " Total Due: " + Debit ));
//Body.HorizontalAlignment = Element.ALIGN_RIGHT;
//Caption.Colspan = 0;
//Caption.HorizontalAlignment = 1;
//General_Table.AddCell(Caption);
//General_Table.AddCell(Body);
PdfPTable mytable = new PdfPTable(3);
mytable.SpacingBefore = 40f;
Paragraph accountpar = new Paragraph("Description");
accountpar.IndentationLeft = 200f;
accountpar.SpacingBefore = 30f;
accountpar.SpacingAfter = 10f;
Paragraph Referencepar = new Paragraph( Reference);
Referencepar.IndentationLeft = 200f;
Referencepar.SpacingBefore = 30f;
Referencepar.SpacingAfter = 10f;
Paragraph Totalpar = new Paragraph("Total Due:" + "R" + Debit);
Totalpar.IndentationLeft = 200f;
Totalpar.SpacingBefore = 30f;
Totalpar.SpacingAfter = 10f;
Paragraph Refnumpar = new Paragraph("Reference Num: "+refnum);
Refnumpar.IndentationLeft = 150f;
Refnumpar.SpacingBefore = 10f;
Refnumpar.SpacingAfter = 30f;
mytable.AddCell(Refnumpar);
mytable.AddCell(Referencepar);
mytable.AddCell(Totalpar);
#endregion
//add Image to pdf
NewDoc.Add(img);
//add accountNo to pdf
NewDoc.Add(AccountNolist);
//add Contact to pdf
NewDoc.Add(Contactlist);
//add emailaddress to pdf
NewDoc.Add(emailAddresslist);
//add Telephone Number to pdf
NewDoc.Add(Telephonelist);
//add address to pdf
NewDoc.Add(AddressList);
//NewDoc.Add(accountpar);
//NewDoc.Add(Supscriptionpar);
NewDoc.Add(mytable);
//save Pdf
NewDoc.Close();
bits = ms.ToArray();
string updateCmd = "UPDATE users.accounting SET acc_pdf = @acc_pdf WHERE refnum =" + refnum;
MySqlConnection cnnx;
connetionString = "****************";
cnnx = new MySqlConnection(connetionString);
MySqlCommand Updatecommand = new MySqlCommand(updateCmd, cnnx);
Updatecommand.Parameters.AddWithValue("@acc_pdf", bits);
cnnx.Open();
Updatecommand.ExecuteNonQuery();
cnnx.Close();
}
}
}
catch (Exception ex)
{
MessageBox.Show(ex.Message);
}
}
private void Form1_Load(object sender, EventArgs e)
{
}
}
}
答案 0 :(得分：2)
尝试更改msdn's example for the MySqlDataReader上提供的语句顺序：
if (reader.HasRows)
{
while (reader.Read())
{
Console.WriteLine("{0}\t{1}", reader.GetInt32(0),
reader.GetString(1));
}
}
else
{
Console.WriteLine("No rows found.");
}
还要检查@Cameron Tinker问的问题：
如果您在查询上运行查询，那么查询是否会返回多个结果 数据库直接？
为避免资源泄漏，请不要忘记使用reader.Close();以及连接关闭阅读器。 （或者更好地使用using关键字）