C++: read access data using ADOX.DLL and System::Data::OleDb

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#pragma once #include "Form2.h"   namespace cdemo {       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::Data::OleDb;     using namespace System::IO;       /// <summary>     /// Form1 摘要     ///http://1code.codeplex.com/     ///http://www.codeproject.com/Tips/810596/Csharp-VB-NET-Cplusplus-CLI-Create-read-and-write     /// 警告: 如果更改此类的名称，则需要更改     ///          与此类所依赖的所有 .resx 文件关联的托管资源编译器工具的     ///          “资源文件名”属性。否则，     ///          设计器将不能与此窗体的关联     ///          本地化资源正确交互。     /// </summary>     public ref class Form1 : public System::Windows::Forms::Form     {     public:         Form1(void)         {             InitializeComponent();             //             //TODO: 在此处添加构造函数代码             //         }       protected:         /// <summary>         /// 清理所有正在使用的资源。         /// </summary>         ~Form1()         {             if (components)             {                 delete components;             }         }     private: System::Windows::Forms::Label^  label1;     private: System::Windows::Forms::DataGridView^  dataGridView1;     private: System::Windows::Forms::ComboBox^  comboBoxTables;     private: System::Windows::Forms::Button^  buttonOK;     protected:       private:         /// <summary>         /// 必需的设计器变量。         /// </summary>         System::ComponentModel::Container ^components;   #pragma region Windows Form Designer generated code         /// <summary>         /// 设计器支持所需的方法 - 不要         /// 使用代码编辑器修改此方法的内容。         /// </summary>         void InitializeComponent(void)         {             this->label1 = (gcnew System::Windows::Forms::Label());             this->dataGridView1 = (gcnew System::Windows::Forms::DataGridView());             this->comboBoxTables = (gcnew System::Windows::Forms::ComboBox());             this->buttonOK = (gcnew System::Windows::Forms::Button());             (cli::safe_cast<System::ComponentModel::ISupportInitialize^  >(this->dataGridView1))->BeginInit();             this->SuspendLayout();             //             // label1             //             this->label1->AutoSize = true;             this->label1->Location = System::Drawing::Point(533, 268);             this->label1->Name = L"label1";             this->label1->Size = System::Drawing::Size(41, 12);             this->label1->TabIndex = 0;             this->label1->Text = L"label1";             //             // dataGridView1             //             this->dataGridView1->ColumnHeadersHeightSizeMode = System::Windows::Forms::DataGridViewColumnHeadersHeightSizeMode::AutoSize;             this->dataGridView1->Location = System::Drawing::Point(32, 84);             this->dataGridView1->Name = L"dataGridView1";             this->dataGridView1->RowTemplate->Height = 23;             this->dataGridView1->Size = System::Drawing::Size(478, 344);             this->dataGridView1->TabIndex = 1;             this->dataGridView1->CellDoubleClick += gcnew System::Windows::Forms::DataGridViewCellEventHandler(this, &Form1::dataGridView1_CellDoubleClick);             //             // comboBoxTables             //             this->comboBoxTables->FormattingEnabled = true;             this->comboBoxTables->Location = System::Drawing::Point(87, 27);             this->comboBoxTables->Name = L"comboBoxTables";             this->comboBoxTables->Size = System::Drawing::Size(121, 20);             this->comboBoxTables->TabIndex = 2;             //             // buttonOK             //             this->buttonOK->Location = System::Drawing::Point(228, 27);             this->buttonOK->Name = L"buttonOK";             this->buttonOK->Size = System::Drawing::Size(75, 23);             this->buttonOK->TabIndex = 3;             this->buttonOK->Text = L"button1";             this->buttonOK->UseVisualStyleBackColor = true;             this->buttonOK->Click += gcnew System::EventHandler(this, &Form1::buttonOK_Click);             //             // Form1             //             this->AutoScaleDimensions = System::Drawing::SizeF(6, 12);             this->AutoScaleMode = System::Windows::Forms::AutoScaleMode::Font;             this->ClientSize = System::Drawing::Size(586, 485);             this->Controls->Add(this->buttonOK);             this->Controls->Add(this->comboBoxTables);             this->Controls->Add(this->dataGridView1);             this->Controls->Add(this->label1);             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);             this->PerformLayout();           } #pragma endregion               String ^DBPath;           OleDbConnection ^conn;         OleDbDataAdapter ^adapter;         DataTable ^dtMain;       private: System::Void Form1_Load(System::Object^  sender, System::EventArgs^  e) {                     DBPath = Application::StartupPath + "\\test.mdb";                  // create DB via ADOX if not exists                  if (!File::Exists(DBPath)) {                      ADOX::Catalog ^cat = gcnew ADOX::Catalog(); //添加引用 Interop.ADOX.2.8.dll                      cat->Create("Provider=Microsoft.Jet.OLEDB.4.0;Data Source=" + DBPath);                      cat = nullptr;                  }                    // connect to DB                  conn = gcnew OleDbConnection("Provider=Microsoft.Jet.OLEDB.4.0;Data Source=" + DBPath);                  conn->Open();      //         try {                     //OleDbCommand ^cmd = gcnew OleDbCommand("CREATE TABLE [geovindu] ([id] COUNTER PRIMARY KEY, [FirstName] MEMO, [Age] INT,[Email] MEMO);", conn); //创建表      //             cmd->ExecuteNonQuery();                     //delete cmd;                  //} catch (Exception ^ex) {if (ex != nullptr) ex = nullptr; }                    // 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() == "TABLE") {                         comboBoxTables->Items->Add(dt->Rows[i]->ItemArray[dt->Columns->IndexOf("TABLE_NAME")]->ToString());                     }                      }                  delete dt;                        int i,pr=0;                  for(i=1;i<=10;i++)                                    pr=pr*i;                                        //char s="pr=%d";                    this->label1->Text= pr.ToString();                                                             //设置dataGridView的一些属性     //        dataGridView1->Dock=DockStyle::Fill;     //        dataGridView1->AutoResizeColumns();     //        dataGridView1->AutoSizeColumnsMode=DataGridViewAutoSizeColumnsMode::AllCells;     //        dataGridView1->EnableHeadersVisualStyles=true;/*根据应用程序来设置的，如果为false则根据自己的设置来绘制*/       //        //设置表头的属性     //        DataGridViewCellStyle^ headerStyle=gcnew DataGridViewCellStyle;     //        headerStyle->Font=gcnew System::Drawing::Font("Times New Roman",12,FontStyle::Bold);     //        headerStyle->BackColor=Color::AliceBlue;     //        headerStyle->ForeColor=Color::BurlyWood;     //        dataGridView1->ColumnHeadersDefaultCellStyle=headerStyle;       //        dataGridView1->AutoResizeColumnHeadersHeight();                   //DataSet^ myDataSet = gcnew DataSet("Game Data");                 //myDataSet->Tables->Add("Player");                 //myDataSet->Tables->Add("Score");                    //DataTable^ playerTable = myDataSet->Tables["Player"];                 //DataColumn^ firstNameColumn1 = playerTable->Columns->Add("First Name",String::typeid);                 //DataColumn^ lastNameColumn1 = playerTable->Columns->Add("Last Name",String::typeid);                 //playerTable->Columns->Add("Email", String::typeid);                 //playerTable->Rows->Add("geovin","du","geovindu@163.com");                 //playerTable->Rows->Add("聚文","涂","geovindu@qq.com");     //             //1.                 ////dataGridView1->DataSource=myDataSet->Tables["Player"];//playerTable;                 ////2.     //            dataGridView1->DataSource=playerTable;                 //dataGridView1->Refresh();                 ////dataGridView1->DataBindings::get;                }                             ////             private: System::Void dataGridView1_CellDoubleClick(System::Object^  sender, System::Windows::Forms::DataGridViewCellEventArgs^  e) {                Form2 ^ frm2 = gcnew Form2();              frm2->Text="编辑资料";              frm2->textBox1->Text=dataGridView1->Rows[e->RowIndex]->Cells["FirstName"]->Value->ToString();              frm2->textBox2->Text=dataGridView1->Rows[e->RowIndex]->Cells["Email"]->Value->ToString();              frm2->Show();              //this->Hide();                                                                     }                                    ///              private: System::Void buttonOK_Click(System::Object^  sender, System::EventArgs^  e) {                   if (comboBoxTables->SelectedItem == nullptr) return;                   adapter = gcnew OleDbDataAdapter("SELECT * FROM [" + comboBoxTables->SelectedItem->ToString() + "]", conn);                gcnew OleDbCommandBuilder(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);            } }; }