【轉載】C#對Access進行增刪改查

聲明:本文爲轉載,非原創，如有侵權，請告知，本人會盡快刪除。

原文地址：http://www.jb51.net/article/90780.htm

這篇文章整理了C#對Access數據庫的查詢、添加記錄、刪除記錄和更新數據等一系列的操作示例，有需要的可以參考學習。

首先是AccessHelper.cs，網上有下載，下面附送一份；

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using System; using System.Collections.Generic; using System.Linq; using System.Text; using System.Threading.Tasks; using System.Data.OleDb; using System.Data; using System.Windows.Forms;     namespaceyxdain {   publicclassAccessHelper   {     privatestringconn_str = null;     privateOleDbConnection ole_connection =null;     privateOleDbCommand ole_command =null;     privateOleDbDataReader ole_reader =null;     privateDataTable dt =null;         /// <summary>     /// 構造函數     /// </summary>     publicAccessHelper()     {       //conn_str = @"Provider=Microsoft.Jet.OLEDB.4.0;Data Source='" + Environment.CurrentDirectory + "\\yxdain.accdb'";       conn_str =@"Provider=Microsoft.ACE.OLEDB.12.0;Data Source='"+ Environment.CurrentDirectory + "\\yxdain.accdb'";                 InitDB();     }         privatevoidInitDB()     {       ole_connection =newOleDbConnection(conn_str);//創建實例       ole_command =newOleDbCommand();     }         /// <summary>     /// 構造函數     /// </summary>     ///<param name="db_path">數據庫路徑     publicAccessHelper(stringdb_path)     {       //conn_str ="Provider=Microsoft.Jet.OLEDB.4.0;Data Source='"+ db_path + "'";       conn_str ="Provider=Microsoft.ACE.OLEDB.12.0;Data Source='"+ db_path +"'";                 InitDB();     }         /// <summary>     /// 轉換數據格式     /// </summary>     ///<param name="reader">數據源     /// <returns>數據列表</returns>     privateDataTable ConvertOleDbReaderToDataTable(refOleDbDataReader reader)     {       DataTable dt_tmp =null;       DataRow dr =null;       intdata_column_count = 0;       inti = 0;           data_column_count = reader.FieldCount;       dt_tmp = BuildAndInitDataTable(data_column_count);           if(dt_tmp ==null)       {         returnnull;       }           while(reader.Read())       {         dr = dt_tmp.NewRow();             for(i = 0; i < data_column_count; ++i)         {           dr[i] = reader[i];         }             dt_tmp.Rows.Add(dr);       }           returndt_tmp;     }         /// <summary>     /// 創建並初始化數據列表     /// </summary>     ///<param name="Field_Count">列的個數     /// <returns>數據列表</returns>     privateDataTable BuildAndInitDataTable(intField_Count)     {       DataTable dt_tmp =null;       DataColumn dc =null;       inti = 0;           if(Field_Count <= 0)       {         returnnull;       }           dt_tmp =newDataTable();           for(i = 0; i < Field_Count; ++i)       {         dc =newDataColumn(i.ToString());         dt_tmp.Columns.Add(dc);       }           returndt_tmp;     }         /// <summary>     /// 從數據庫裏面獲取數據     /// </summary>     ///<param name="strSql">查詢語句     /// <returns>數據列表</returns>     publicDataTable GetDataTableFromDB(stringstrSql)     {       if(conn_str ==null)       {         returnnull;       }                 try       {         ole_connection.Open();//打開連接             if(ole_connection.State == ConnectionState.Closed)         {           returnnull;         }             ole_command.CommandText = strSql;         ole_command.Connection = ole_connection;             ole_reader = ole_command.ExecuteReader(CommandBehavior.Default);             dt = ConvertOleDbReaderToDataTable(refole_reader);             ole_reader.Close();         ole_reader.Dispose();       }       catch(System.Exception e)       {         //Console.WriteLine(e.ToString());         MessageBox.Show(e.Message);       }       finally       {         if(ole_connection.State != ConnectionState.Closed)         {           ole_connection.Close();         }       }                 returndt;     }         /// <summary>     /// 執行sql語句     /// </summary>     ///<param name="strSql">sql語句     /// <returns>返回結果</returns>     publicintExcuteSql(stringstrSql)     {       intnResult = 0;           try       {         ole_connection.Open();//打開數據庫連接         if(ole_connection.State == ConnectionState.Closed)         {           returnnResult;         }             ole_command.Connection = ole_connection;         ole_command.CommandText = strSql;             nResult = ole_command.ExecuteNonQuery();       }       catch(System.Exception e)       {         //Console.WriteLine(e.ToString());         MessageBox.Show(e.Message);         returnnResult;       }       finally       {         if(ole_connection.State != ConnectionState.Closed)         {           ole_connection.Close();         }       }           returnnResult;     }   } }

定義變量，設置列標題；

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privateAccessHelper achelp; ......   privatevoidForm1_Load(objectsender, EventArgs e)   {         achelp =newAccessHelper();     stringsql1 ="select * from ycyx";     databind1(sql1);            dataGridView1.Columns[0].Visible =false;     dataGridView1.Columns[1].HeaderCell.Value ="服務號碼";     dataGridView1.Columns[2].HeaderCell.Value ="客戶名稱";     dataGridView1.Columns[3].HeaderCell.Value ="歸屬地區";     dataGridView1.Columns[4].HeaderCell.Value ="當前品牌";     dataGridView1.Columns[5].HeaderCell.Value ="當前套餐";     dataGridView1.Columns[6].HeaderCell.Value ="當前狀態";   }

顯示數據表全部內容；

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privatevoiddatabind1(stringsqlstr) {   DataTable dt =newDataTable();   dt = achelp.GetDataTableFromDB(sqlstr);   dataGridView1.DataSource = dt; }

讀取要更新記錄到更新窗體控件；

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privatevoidbutton3_Click(objectsender, EventArgs e) {   if(dataGridView1.SelectedRows.Count < 1 || dataGridView1.SelectedRows[0].Cells[1].Value ==null)   {     MessageBox.Show("沒有選中行。","M營銷");     return;   }   //f3.Owner = this;   DataTable dt =newDataTable();   objectoid = dataGridView1.SelectedRows[0].Cells[0].Value;   stringsql ="select * from ycyx where ID="+ oid;   dt = achelp.GetDataTableFromDB(sql);   f3 =newForm3();   f3.id =int.Parse(oid.ToString());   //f3.id = 2;   f3.Text1 = dt.Rows[0][1].ToString();   f3.Text2 = dt.Rows[0][2].ToString();   f3.Text3 = dt.Rows[0][3].ToString();   f3.Text4 = dt.Rows[0][4].ToString();   f3.Text5 = dt.Rows[0][5].ToString();   f3.Text6 = dt.Rows[0][6].ToString();       f3.ShowDialog();       }

添加記錄；

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privatevoidbutton4_Click(objectsender, EventArgs e) {   if(textBox1.Text ==""&& textBox2.Text ==""&& textBox3.Text ==""&& textBox4.Text ==""&& textBox5.Text ==""&& textBox6.Text =="")   {     MessageBox.Show("沒有要添加的內容","M營銷添加");     return;   }   else   {     stringsql ="insert into ycyx (fwhm,khmc,gsdq,dqpp,dqtc,dqzt) values ('"+ textBox1.Text +"','"+ textBox2.Text +"','"+       textBox3.Text +"','"+ textBox4.Text +"','"+ textBox5.Text +"','"+ textBox6.Text +"')";     intret = achelp.ExcuteSql(sql);     stringsql1 ="select * from ycyx";     databind1(sql1);     textBox1.Text ="";     textBox2.Text ="";     textBox3.Text ="";     textBox4.Text ="";     textBox5.Text ="";     textBox6.Text ="";   } }

刪除記錄；

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privatevoidbutton2_Click(objectsender, EventArgs e) {   if(dataGridView1.SelectedRows.Count < 1 || dataGridView1.SelectedRows[0].Cells[1].Value ==null)   {     MessageBox.Show("沒有選中行。","M營銷");   }   else   {     objectoid = dataGridView1.SelectedRows[0].Cells[0].Value;     if(DialogResult.No == MessageBox.Show("將刪除第 "+ (dataGridView1.CurrentCell.RowIndex + 1).ToString() +" 行，確定？","M營銷", MessageBoxButtons.YesNo))     {       return;     }     else     {       stringsql ="delete from ycyx where ID="+ oid;       intret = achelp.ExcuteSql(sql);     }     stringsql1 ="select * from ycyx";     databind1(sql1);   } }

查詢；

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privatevoidbutton13_Click(objectsender, EventArgs e) {   if(textBox23.Text =="")   {     MessageBox.Show("請輸入要查詢的當前品牌","M營銷");     return;   }   else   {     stringsql ="select * from ycyx where dqpp='"+ textBox23.Text +"'";     DataTable dt =newSystem.Data.DataTable();     dt = achelp.GetDataTableFromDB(sql);     dataGridView1.DataSource = dt;   } }

用戶確定顯示或不顯示哪些數據列；

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privatevoidbutton15_Click(objectsender, EventArgs e) {   if(checkBox1.Checked ==true)   {     dataGridView1.Columns[1].Visible =true;   }   else   {     dataGridView1.Columns[1].Visible =false;   }       if(checkBox2.Checked ==true)   {     dataGridView1.Columns[2].Visible =true;   }   else   {     dataGridView1.Columns[2].Visible =false;   }       if(checkBox3.Checked ==true)   {     dataGridView1.Columns[3].Visible =true;   }   else   {     dataGridView1.Columns[3].Visible =false;   }       if(checkBox4.Checked ==true)   {     dataGridView1.Columns[4].Visible =true;   }   else   {     dataGridView1.Columns[4].Visible =false;   }       if(checkBox5.Checked ==true)   {     dataGridView1.Columns[5].Visible =true;   }   else   {     dataGridView1.Columns[5].Visible =false;   }       if(checkBox6.Checked ==true)   {     dataGridView1.Columns[6].Visible =true;   }   else   {     dataGridView1.Columns[6].Visible =false;   } }

更新數據；

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publicpartialclassForm3 : Form   {     privateAccessHelper achelp;     privateintiid;         publicForm3()     {       InitializeComponent();       achelp =newAccessHelper();       iid = 0;     }         // 更新     privatevoidbutton1_Click(objectsender, EventArgs e)     {       try       {         //UPDATE Person SET Address = 'Zhongshan 23', City = 'Nanjing'WHERE LastName = 'Wilson'         stringsql ="update ycyx set fwhm='"+textBox1.Text+"',khmc='"+textBox2.Text+"',gsdq='"+textBox3.Text+"',dqpp='"+textBox4.Text+           "',dqtc='"+textBox5.Text+"',dqzt='"+textBox6.Text+"' where ID="+iid;                           intret = achelp.ExcuteSql(sql);         if(ret > -1)         {           this.Hide();           MessageBox.Show("更新成功","M營銷");         }       }       catch(Exception ex)       {         MessageBox.Show(ex.Message);       }                       }         privatevoidForm3_Load(objectsender, EventArgs e)     {         }         publicintid     {       get{return this.iid; }       set{this.iid = value; }     }             publicstringText1     {       get{return this.textBox1.Text; }       set{this.textBox1.Text = value; }     }         publicstringText2     {       get{return this.textBox2.Text; }       set{this.textBox2.Text = value; }     }         publicstringText3     {       get{return this.textBox3.Text; }       set{this.textBox3.Text = value; }     }         publicstringText4     {       get{return this.textBox4.Text; }       set{this.textBox4.Text = value; }     }         publicstringText5     {       get{return this.textBox5.Text; }       set{this.textBox5.Text = value; }     }         publicstringText6     {       get{return this.textBox6.Text; }       set{this.textBox6.Text = value; }     }         //取消     privatevoidbutton2_Click(objectsender, EventArgs e)     {       this.Hide();     }   } }

注意此處有一個技巧；C# Winform，在窗體之間傳值，或在一個窗體中設置另一個窗體的控件的值時，有多種方式；最好方式是如上代碼所示；使用.net的get、set屬性； 

控件是一個窗體的私有變量，不能在另一個窗體中直接訪問；爲了在a窗體中設置b窗體的控件的值，對b窗體的控件都添加一個帶get、set的公共屬性，就可在a中設置b中控件的值，具體看代碼；

以上就是C#對Access進行增刪改查的完整示例代碼，希望對大家學習C#能有所幫助。