C++:readSQLserverdatausingSystem::Data::SqlClient

stdafx.h:

stdafx.h:

// stdafx.h : include file for standard system include files,// or project specific include files that are used frequently, but// are changed infrequently#pragma once#using #using #using #using // TODO: reference additional headers your program requires here

　　Form1.h

#pragma oncenamespace SQLServer2008R2inCCLI {using namespace System;using namespace System::ComponentModel;using namespace System::Collections;using namespace System::Windows::Forms;using namespace System::Data;using namespace System::Drawing;using namespace System::Configuration; using namespace ADODB;//c:\Program Files\Common Files\System\ADO\msado15.dllusing namespace System::Data::SqlClient;/// /// Summary for Form1////// WARNING: If you change the name of this class, you will need to change the/// ‘Resource File Name‘ property for the managed resource compiler tool/// associated with all .resx files this class depends on. Otherwise,/// the designers will not be able to interact properly with localized/// resources associated with this form./// public ref class Form1 : public System::Windows::Forms::Form{public:Form1(void){InitializeComponent();////TODO: Add the constructor code here//}protected:/// /// Clean up any resources being used./// ~Form1(){if (components){delete components;}} private: System::Windows::Forms::DataGridView^ dataGridView1; private: System::Windows::Forms::Label^ label1; private: System::Windows::Forms::ComboBox^ comboBoxTables; private: System::Windows::Forms::Button^ buttonOK; private: System::Windows::Forms::ToolTip^ toolTip1;private: System::ComponentModel::IContainer^ components;protected: private:/// /// Required designer variable./// #pragma region Windows Form Designer generated code/// /// Required method for Designer support - do not modify/// the contents of this method with the code editor./// void InitializeComponent(void){this->compOnents= (gcnew System::ComponentModel::Container());this->dataGridView1 = (gcnew System::Windows::Forms::DataGridView());this->label1 = (gcnew System::Windows::Forms::Label());this->comboBoxTables = (gcnew System::Windows::Forms::ComboBox());this->buttOnOK= (gcnew System::Windows::Forms::Button());this->toolTip1 = (gcnew System::Windows::Forms::ToolTip(this->components));(cli::safe_cast(this->dataGridView1))->BeginInit();this->SuspendLayout();// // dataGridView1// this->dataGridView1->Anchor = static_cast((((System::Windows::Forms::AnchorStyles::Top | System::Windows::Forms::AnchorStyles::Bottom) | System::Windows::Forms::AnchorStyles::Left) | System::Windows::Forms::AnchorStyles::Right));this->dataGridView1->ColumnHeadersHeightSizeMode = System::Windows::Forms::DataGridViewColumnHeadersHeightSizeMode::AutoSize;this->dataGridView1->Location = System::Drawing::Point(12, 44);this->dataGridView1->Name = L"dataGridView1";this->dataGridView1->ShowCellToolTips = false;this->dataGridView1->Size = System::Drawing::Size(493, 266);this->dataGridView1->TabIndex = 0;this->dataGridView1->MouseDown += gcnew System::Windows::Forms::MouseEventHandler(this, this->dataGridView1->DataError += gcnew System::Windows::Forms::DataGridViewDataErrorEventHandler(this, // // label1// this->label1->Location = System::Drawing::Point(12, 9);this->label1->Name = L"label1";this->label1->Size = System::Drawing::Size(65, 32);this->label1->TabIndex = 1;this->label1->Text = L"Select table to show:";// // comboBoxTables// this->comboBoxTables->DropDownStyle = System::Windows::Forms::ComboBoxStyle::DropDownList;this->comboBoxTables->FormattingEnabled = true;this->comboBoxTables->Location = System::Drawing::Point(83, 12);this->comboBoxTables->Name = L"comboBoxTables";this->comboBoxTables->Size = System::Drawing::Size(165, 21);this->comboBoxTables->TabIndex = 2;// // buttonOK// this->buttonOK->Location = System::Drawing::Point(254, 12);this->buttonOK->Name = L"buttonOK";this->buttonOK->Size = System::Drawing::Size(56, 21);this->buttonOK->TabIndex = 3;this->buttonOK->Text = L"OK";this->buttonOK->UseVisualStyleBackColor = true;this->buttonOK->Click += gcnew System::EventHandler(this, // // toolTip1// this->toolTip1->AutoPopDelay = 5000;this->toolTip1->InitialDelay = 0;this->toolTip1->IsBalloon = true;this->toolTip1->ReshowDelay = 0;this->toolTip1->ToolTipIcon = System::Windows::Forms::ToolTipIcon::Warning;this->toolTip1->UseAnimation = false;this->toolTip1->UseFading = false;// // Form1// this->AutoScaleDimensiOns= System::Drawing::SizeF(6, 13);this->AutoScaleMode = System::Windows::Forms::AutoScaleMode::Font;this->ClientSize = System::Drawing::Size(517, 322);this->Controls->Add(this->buttonOK);this->Controls->Add(this->comboBoxTables);this->Controls->Add(this->label1);this->Controls->Add(this->dataGridView1);this->Name = L"Form1";this->Text = L"Form1";this->Load += gcnew System::EventHandler(this, this->FormClosed += gcnew System::Windows::Forms::FormClosedEventHandler(this, (cli::safe_cast(this->dataGridView1))->EndInit();this->ResumeLayout(false);}#pragma endregionString ^ServerName, ^DBName; SqlConnection ^conn; SqlDataAdapter ^adapter; DataTable ^dtMain;private: System::Void Form1_Load(System::Object^ sender, System::EventArgs^ e) { ServerName = "GEOVINDU-PC\\GEOVIN"; DBName = "DuVehicle"; // create database if not exists //try {// ADODB::COnnection="";//c:\Program Files\Common Files\System\ADO\msado15.dll // connect to server // to database "master" to check if our database exists // to create it if it isn‘t exists //cOnn= gcnew SqlConnection("Server=" + ServerName + ";Database=DuVehicle;UID=sa;PWD=geovindu;"); //conn->Open(); //SqlCommand ^cmd = gcnew SqlCommand(String::Format("CREATE DATABASE [{0}] ON (" + // " NAME = {0}, " +//" FILENAME = ‘" + Application::StartupPath + "\\{0}.mdf‘" + // ");", // DBName), conn); // cmd->ExecuteNonQuery(); //delete cmd; /* } catch (Exception ^ex) { }*/ // create table "Table 1" if not exists //SqlCommand ^cmd = gcnew SqlCommand(String::Format( // "IF NOT EXISTS (" + // " SELECT [name] " + // " FROM sys.tables " + // " WHERE [name] = ‘{0}‘" + // ") " + // "CREATE TABLE [{0}] (" + // " id [INT] IDENTITY(1,1) PRIMARY KEY CLUSTERED, " + // " [text column] [TEXT] NULL, " + // " [int column] [INT] NULL " + // ")", // "Table 1"), conn); // cmd->ExecuteNonQuery(); //delete cmd; cOnn= gcnew SqlConnection("Server=" + ServerName + ";Database=DuVehicle;UID=sa;PWD=geovindu;"); conn->Open(); // get all tables from DB DataTable ^dt = conn->GetSchema("Tables"); for (int i = 0; i Rows->Count; i++) {if (dt->Rows[i]->ItemArray[dt->Columns->IndexOf("TABLE_TYPE")]->ToString() == "BASE TABLE") {comboBoxTables->Items->Add(dt->Rows[i]->ItemArray[dt->Columns->IndexOf("TABLE_NAME")]->ToString());} } delete dt; }private: System::Void buttonOK_Click(System::Object^ sender, System::EventArgs^ e) { if (comboBoxTables->SelectedItem == nullptr) return; adapter = gcnew SqlDataAdapter("SELECT * FROM [" + comboBoxTables->SelectedItem->ToString() + "]", conn); gcnew SqlCommandBuilder(adapter); dtMain = gcnew DataTable(); adapter->Fill(dtMain); dtMain->Columns["id"]->ReadOnly= true; // deprecate id field edit to prevent exceptions dataGridView1->DataSource = dtMain; }private: System::Void Form1_FormClosed(System::Object^ sender, System::Windows::Forms::FormClosedEventArgs^ e) { if (adapter == nullptr) return; adapter->Update(dtMain); } // show tooltip (not intrusive MessageBox) when user trying to input letters into INT column cellprivate: System::Void dataGridView1_DataError(System::Object^ sender, System::Windows::Forms::DataGridViewDataErrorEventArgs^ e) { if (dtMain->Columns[e->ColumnIndex]->DataType == Int64::typeid || dtMain->Columns[e->ColumnIndex]->DataType == Int32::typeid ||dtMain->Columns[e->ColumnIndex]->DataType == Int16::typeid) { Rectangle ^rectColumn; rectColumn = dataGridView1->GetColumnDisplayRectangle(e->ColumnIndex, false); Rectangle ^rectRow; rectRow = dataGridView1->GetRowDisplayRectangle(e->RowIndex, false); toolTip1->ToolTipTitle = "This field is for numbers only."; toolTip1->Show(" ", dataGridView1, rectColumn->Left, rectRow->Top + rectRow->Height);delete rectColumn;delete rectRow; } }private: System::Void dataGridView1_MouseDown(System::Object^ sender, System::Windows::Forms::MouseEventArgs^ e) { toolTip1->Hide(dataGridView1); }};}

C++: read SQL server data using System::Data::SqlClient