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

stdafx.h:

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// 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 <mscorlib.dll> #using <System.dll> #using <System.Data.dll> #using <System.Xml.dll> // TODO: reference additional headers your program requires here

　　Form1.h

 

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#pragma once     namespace 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.dll       using namespace System::Data::SqlClient;       /// <summary>     /// 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.     /// </summary>     public ref class Form1 : public System::Windows::Forms::Form     {     public:         Form1(void)         {             InitializeComponent();             //             //TODO: Add the constructor code here             //         }       protected:         /// <summary>         /// Clean up any resources being used.         /// </summary>         ~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:         /// <summary>         /// Required designer variable.         /// </summary>     #pragma region Windows Form Designer generated code         /// <summary>         /// Required method for Designer support - do not modify         /// the contents of this method with the code editor.         /// </summary>         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<System::ComponentModel::ISupportInitialize^  >(this->dataGridView1))->BeginInit();             this->SuspendLayout();             //             // dataGridView1             //             this->dataGridView1->Anchor = static_cast<System::Windows::Forms::AnchorStyles>((((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, &Form1::dataGridView1_MouseDown);             this->dataGridView1->DataError += gcnew System::Windows::Forms::DataGridViewDataErrorEventHandler(this, &Form1::dataGridView1_DataError);             //             // 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, &Form1::buttonOK_Click);             //             // 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, &Form1::Form1_Load);             this->FormClosed += gcnew System::Windows::Forms::FormClosedEventHandler(this, &Form1::Form1_FormClosed);             (cli::safe_cast<System::ComponentModel::ISupportInitialize^  >(this->dataGridView1))->EndInit();             this->ResumeLayout(false);           } #pragma endregion         String ^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 < dt->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 cell private: 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);          } }; }