в 15:31, 26 мая 2010

2010-05-26T15:31:02Z

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2010-05-26T12:06:18Z

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==Maintain the table of Authors==

<source lang="csharp">
using namespace System;
using namespace System::ComponentModel;
using namespace System::Collections;
using namespace System::Windows::Forms;
using namespace System::Data;
using namespace System::Data::SqlClient;
using namespace System::Drawing;
using namespace System::Configuration;
public ref class Form1 : public System::Windows::Forms::Form
{
public:
Form1(void)
{
InitializeComponent();
SqlConnection ^connect = gcnew SqlConnection();
connect->ConnectionString =
ConfigurationManager::ConnectionStrings["SQLConnection"]->ConnectionString;
dAdapt = gcnew SqlDataAdapter();
dAdapt->MissingSchemaAction = MissingSchemaAction::AddWithKey;

dAdapt->SelectCommand = gcnew SqlCommand("SELECT AuthorID, LastName, FirstName FROM Authors", connect);

dAdapt->InsertCommand = gcnew SqlCommand("INSERT INTO Authors (LastName, FirstName)VALUES (@LastName, @FirstName)", connect);
dAdapt->InsertCommand->Parameters->Add("@LastName", SqlDbType::VarChar, 50, "LastName");
dAdapt->InsertCommand->Parameters->Add("@FirstName", SqlDbType::VarChar, 50, "FirstName");

dAdapt->UpdateCommand = gcnew SqlCommand("UPDATE Authors SET LastName = @LastName, FirstName = @FirstName "
"WHERE AuthorID = @AuthorID", connect);
dAdapt->UpdateCommand->Parameters->Add("@LastName", SqlDbType::VarChar, 50, "LastName");
dAdapt->UpdateCommand->Parameters->Add("@FirstName", SqlDbType::VarChar, 50, "FirstName");
dAdapt->UpdateCommand->Parameters->Add("@AuthorID", SqlDbType::Int, 4, "AuthorID");

dAdapt->DeleteCommand = gcnew SqlCommand("DELETE FROM Authors WHERE AuthorID = @AuthorID", connect);
dAdapt->DeleteCommand->Parameters->Add("@AuthorID", SqlDbType::Int, 4, "AuthorID");

dSet = gcnew DataSet();
dAdapt->Fill(dSet, "Authors");
DataTable ^dt = dSet->Tables["Authors"];
if (dt == nullptr)
throw gcnew Exception("No Authors Table");
for each(DataRow ^row in dt->Rows)
{
lbAuthors->Items->Add(ListBoxItem(row));
}
CurrentAuthorID = -1;
}
System::Windows::Forms::Button^ bnRollback;
System::Windows::Forms::Button^ bnCommit;
System::Windows::Forms::Button^ bnDelete;
System::Windows::Forms::Button^ bnUpdate;
System::Windows::Forms::Button^ bnAdd;
System::Windows::Forms::ListBox^ lbAuthors;
System::Windows::Forms::TextBox^ tbLastName;
System::Windows::Forms::TextBox^ tbFirstName;
System::Windows::Forms::Label^ label2;
System::Windows::Forms::Label^ label1;
System::ComponentModel::Container ^components;
SqlDataAdapter ^dAdapt;
DataSet ^dSet;
int CurrentAuthorID;
void InitializeComponent(void)
{
this->bnRollback = (gcnew System::Windows::Forms::Button());
this->bnCommit = (gcnew System::Windows::Forms::Button());
this->bnDelete = (gcnew System::Windows::Forms::Button());
this->bnUpdate = (gcnew System::Windows::Forms::Button());
this->bnAdd = (gcnew System::Windows::Forms::Button());
this->lbAuthors = (gcnew System::Windows::Forms::ListBox());
this->tbLastName = (gcnew System::Windows::Forms::TextBox());
this->tbFirstName = (gcnew System::Windows::Forms::TextBox());
this->label2 = (gcnew System::Windows::Forms::Label());
this->label1 = (gcnew System::Windows::Forms::Label());
this->SuspendLayout();
//
// bnRollback
//
this->bnRollback->Font = (gcnew System::Drawing::Font(L"Microsoft Sans Serif", 8.25F, System::Drawing::FontStyle::Bold, System::Drawing::GraphicsUnit::Point,
static_cast<System::Byte>(0)));
this->bnRollback->Location = System::Drawing::Point(312, 162);
this->bnRollback->Name = L"bnRollback";
this->bnRollback->Size = System::Drawing::Size(75, 23);
this->bnRollback->TabIndex = 19;
this->bnRollback->Text = L"Rollback";
this->bnRollback->Click += gcnew System::EventHandler(this, &Form1::bnRollback_Click);
//
// bnCommit
//
this->bnCommit->Font = (gcnew System::Drawing::Font(L"Microsoft Sans Serif", 8.25F, System::Drawing::FontStyle::Bold, System::Drawing::GraphicsUnit::Point,
static_cast<System::Byte>(0)));
this->bnCommit->Location = System::Drawing::Point(312, 132);
this->bnCommit->Margin = System::Windows::Forms::Padding(3, 0, 3, 3);
this->bnCommit->Name = L"bnCommit";
this->bnCommit->Size = System::Drawing::Size(75, 23);
this->bnCommit->TabIndex = 18;
this->bnCommit->Text = L"Commit";
this->bnCommit->Click += gcnew System::EventHandler(this, &Form1::bnCommit_Click);
//
// bnDelete
//
this->bnDelete->Location = System::Drawing::Point(312, 78);
this->bnDelete->Name = L"bnDelete";
this->bnDelete->Size = System::Drawing::Size(75, 23);
this->bnDelete->TabIndex = 17;
this->bnDelete->Text = L"Delete";
this->bnDelete->Click += gcnew System::EventHandler(this, &Form1::bnDelete_Click);
//
// bnUpdate
//
this->bnUpdate->Location = System::Drawing::Point(312, 46);
this->bnUpdate->Name = L"bnUpdate";
this->bnUpdate->Size = System::Drawing::Size(75, 23);
this->bnUpdate->TabIndex = 16;
this->bnUpdate->Text = L"Update";
this->bnUpdate->Click += gcnew System::EventHandler(this, &Form1::bnUpdate_Click);
//
// bnAdd
//
this->bnAdd->Location = System::Drawing::Point(312, 18);
this->bnAdd->Margin = System::Windows::Forms::Padding(3, 3, 3, 1);
this->bnAdd->Name = L"bnAdd";
this->bnAdd->Size = System::Drawing::Size(75, 23);
this->bnAdd->TabIndex = 15;
this->bnAdd->Text = L"Add";
this->bnAdd->Click += gcnew System::EventHandler(this, &Form1::bnAdd_Click);
//
// lbAuthors
//
this->lbAuthors->FormattingEnabled = true;
this->lbAuthors->Location = System::Drawing::Point(25, 95);
this->lbAuthors->Name = L"lbAuthors";
this->lbAuthors->Size = System::Drawing::Size(257, 95);
this->lbAuthors->TabIndex = 14;
this->lbAuthors->SelectedIndexChanged += gcnew System::EventHandler(this, &Form1::lbAuthors_SelectedIndexChanged);
//
// tbLastName
//
this->tbLastName->Location = System::Drawing::Point(87, 51);
this->tbLastName->Margin = System::Windows::Forms::Padding(1, 3, 3, 3);
this->tbLastName->Name = L"tbLastName";
this->tbLastName->Size = System::Drawing::Size(127, 20);
this->tbLastName->TabIndex = 13;
//
// tbFirstName
//
this->tbFirstName->Location = System::Drawing::Point(87, 24);
this->tbFirstName->Margin = System::Windows::Forms::Padding(1, 3, 3, 3);
this->tbFirstName->Name = L"tbFirstName";
this->tbFirstName->Size = System::Drawing::Size(127, 20);
this->tbFirstName->TabIndex = 12;
//
// label2
//
this->label2->AutoSize = true;
this->label2->Location = System::Drawing::Point(25, 57);
this->label2->Margin = System::Windows::Forms::Padding(3, 3, 2, 3);
this->label2->Name = L"label2";
this->label2->Size = System::Drawing::Size(58, 13);
this->label2->TabIndex = 11;
this->label2->Text = L"Last Name";
//
// label1
//
this->label1->AutoSize = true;
this->label1->Location = System::Drawing::Point(25, 27);
this->label1->Margin = System::Windows::Forms::Padding(3, 3, 2, 3);
this->label1->Name = L"label1";
this->label1->Size = System::Drawing::Size(57, 13);
this->label1->TabIndex = 10;
this->label1->Text = L"First Name";
//
// Form1
//
this->AutoScaleDimensions = System::Drawing::SizeF(6, 13);
this->AutoScaleMode = System::Windows::Forms::AutoScaleMode::Font;
this->ClientSize = System::Drawing::Size(413, 208);
this->Controls->Add(this->bnRollback);
this->Controls->Add(this->bnCommit);
this->Controls->Add(this->bnDelete);
this->Controls->Add(this->bnUpdate);
this->Controls->Add(this->bnAdd);
this->Controls->Add(this->lbAuthors);
this->Controls->Add(this->tbLastName);
this->Controls->Add(this->tbFirstName);
this->Controls->Add(this->label2);
this->Controls->Add(this->label1);
this->ResumeLayout(false);
this->PerformLayout();
}
String ^ListBoxItem(DataRow ^row)
{
return String::Format("{0} {1} {2}",
row["AuthorID"],
row["FirstName"],
row["LastName"]);
}
System::Void bnAdd_Click(System::Object^ sender, System::EventArgs^ e)
{
if (tbFirstName->Text->Trim()->Length == 0 ||
tbLastName->Text->Trim()->Length == 0)
return;
DataTable ^dt = dSet->Tables["Authors"];
DataRow ^row = dt->NewRow();
row["FirstName"] = tbFirstName->Text;
row["LastName"] = tbLastName->Text;
dt->Rows->Add(row);
lbAuthors->Items->Add(ListBoxItem(row));
tbFirstName->Text = "";
tbLastName->Text = "";
}
System::Void bnUpdate_Click(System::Object^ sender, System::EventArgs^ e)
{
if (CurrentAuthorID < 0)
return;
DataTable ^dt = dSet->Tables["Authors"];
array<DataRow^>^ row = dt->Select(String::Format("AuthorID={0}", CurrentAuthorID));
row[0]["FirstName"] = tbFirstName->Text;
row[0]["LastName"] = tbLastName->Text;
lbAuthors->Items->Insert(lbAuthors->SelectedIndex, ListBoxItem(row[0]));
lbAuthors->Items->RemoveAt(lbAuthors->SelectedIndex);
}
System::Void bnDelete_Click(System::Object^ sender, System::EventArgs^ e)
{
if (CurrentAuthorID < 0)
return;
DataTable ^dt = dSet->Tables["Authors"];
array<DataRow^>^ row =
dt->Select(String::Format("AuthorID={0}", CurrentAuthorID));
row[0]->Delete();
lbAuthors->Items->RemoveAt(lbAuthors->SelectedIndex);
}
System::Void bnCommit_Click(System::Object^ sender, System::EventArgs^ e)
{
dAdapt->Update(dSet, "Authors");
dSet->AcceptChanges();
lbAuthors->Items->Clear();
DataTable ^dt = dSet->Tables["Authors"];
for each(DataRow ^row in dt->Rows)
{
lbAuthors->Items->Add(ListBoxItem(row));
}
CurrentAuthorID = -1;
}
System::Void bnRollback_Click(System::Object^ sender, System::EventArgs^ e)
{
dSet->RejectChanges();
lbAuthors->Items->Clear();
DataTable ^dt = dSet->Tables["Authors"];
for each(DataRow ^row in dt->Rows)
{
lbAuthors->Items->Add(ListBoxItem(row));
}
CurrentAuthorID = -1;
}
System::Void lbAuthors_SelectedIndexChanged(System::Object^ sender, System::EventArgs^ e)
{
array<wchar_t>^ ASpace = gcnew array<wchar_t> {(wchar_t)" "};
if (lbAuthors->SelectedItem == nullptr)
{
CurrentAuthorID = -1;
tbFirstName->Text = "";
tbLastName->Text = "";
return;
}
array<String^>^ split = lbAuthors->SelectedItem->ToString()->Split(ASpace);
CurrentAuthorID = Convert::ToInt32(split[0]);
tbFirstName->Text = split[1];
tbLastName->Text = split[2];
}
};
}

[STAThreadAttribute]
int main(array<System::String ^> ^args)
{
Application::Run(gcnew Form1());
return 0;
}

</source>

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в 15:31, 26 мая 2010

Admin: 1 версия