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      • ASP.net教程之c#連接sql數據庫以及操作數據庫

      • 2019-06-12 20:57 來源:未知

      1、概述

      ado.net提供了豐富的數據庫操作,這些操作可以分為三個步驟:

      • 第一,使用SqlConnection對象連接數據庫;
      • 第二,建立SqlCommand對象,負責SQL語句的執行和存儲過程的調用;
      • 第三,對SQL或存儲過程執行后返回的“結果”進行操作。

      對返回“結果”的操作可以分為兩類:

      • 一是用SqlDataReader直接一行一行的讀取數據集;
      • 二是DataSet聯合SqlDataAdapter來操作數據庫。

      兩者比較:

      • SqlDataReader時刻與遠程數據庫服務器保持連接,將遠程的數據通過“流”的形式單向傳輸給客戶端,它是“只讀”的。由于是直接訪問數據庫,所以效率較高,但使用起來不方便。
      • DataSet一次性從數據源獲取數據到本地,并在本地建立一個微型數據庫(包含表、行、列、規則、表之間的關系等),期間可以斷開與服務器的連接,使用SqlDataAdapter對象操作“本地微型數據庫”,結束后通過SqlDataAdapter一次性更新到遠程數據庫服務器。這種方式使用起來更方,便簡單。但性能較第一種稍微差一點。(在一般的情況下兩者的性能可以忽略不計。)

      一張十分出名的ADO.NET結構圖:

       

      2、連接字符串的寫法

      string connectString = "Data Source=.;Initial Catalog=Student;Integrated Security=True";

       

      3、SqlConnection對象

      命名空間:System.Data.SqlClient.SqlConnection;

      返回數據庫連接對象,參數字符串。實例化“連接對象”,并打開連接

      SqlConnection sqlCnt = new SqlConnection(connectString);
      sqlCnt.Open();

      使用完成后,需要關閉“連接對象”

      sqlCnt.Close();

       

      4、SqlCommand對象

      命名空間:System.Data.SqlClient.SqlCommand;

      SqlCommand對象用于執行數據庫操作,操作方式有三種:

      • SQL語句:command.CommandType = CommandType.Text;
      • 存儲過程:command.CommandType = CommandType.StoredProcedure;
      • 整張表:command.CommandType = CommandType.TableDirect;

      實例化一個SqlCommand對象

      SqlCommand command = new SqlCommand();
      command.Connection = sqlCnt;            // 綁定SqlConnection對象
      

      或直接從SqlConnection創建

      SqlCommand command = sqlCnt.CreateCommand();     
      

      常用方法:

      • command.ExecuteNonQuery(): 返回受影響函數,如增、刪、改操作;
      • command.ExecuteScalar():執行查詢,返回首行首列的結果;
      • command.ExecuteReader():返回一個數據流(SqlDataReader對象)。

      常用操作

      ① 執行SQL
      SqlCommand cmd = conn.CreateCommand();              //創建SqlCommand對象
      cmd.CommandType = CommandType.Text;
      cmd.CommandText = "select * from products = @ID";   //sql語句
      cmd.Parameters.Add("@ID", SqlDbType.Int);
      cmd.Parameters["@ID"].Value = 1;                    //給參數sql語句的參數賦值
      
      ② 調用存儲過程
      SqlCommand cmd = conn.CreateCommand();                      
      cmd.CommandType = System.Data.CommandType.StoredProcedure;
      cmd.CommandText = "存儲過程名";
      
      ③ 整張表
      SqlCommand cmd = conn.CreateCommand();    
      cmd.CommandType = System.Data.CommandType.TableDirect;
      cmd.CommandText = "表名"
      

       

      5、SqlDataReader對象

      命名空間:System.Data.SqlClient.SqlDataReader;

      SqlDataReader對象提供只讀單向數據的功能,單向:只能依次讀取下一條數據;只讀:DataReader中的數據是只讀的,不能修改;相對地DataSet中的數據可以任意讀取和修改.

      它有一個很重要的方法,是Read(),返回值是個布爾值,作用是前進到下一條數據,一條條的返回數據,當布爾值為真時執行,為假時跳出。如

      SqlCommand command = new SqlCommand();
      command.Connection = sqlCnt;
      command.CommandType = CommandType.Text;
      command.CommandText = "Select * from Users";
      SqlDataReader reader = command.ExecuteReader();		//執行SQL,返回一個“流”
      while (reader.Read())
      {
          Console.Write(reader["username"]);	// 打印出每個用戶的用戶名
      }
      

       

      6、DataSet對象

      6.1 SqlDataAdapter;

      命名空間:System.Data.SqlClient.SqlDataAdapter;

      SqlDataAdapter是SqlCommand和DataSet之間的橋梁,實例化SqlDataAdapter對象:

      SqlConnection sqlCnt = new SqlConnection(connectString);
      sqlCnt.Open();
      
      // 創建SqlCommand
      SqlCommand mySqlCommand = new SqlCommand();
      mySqlCommand.CommandType = CommandType.Text;
      mySqlCommand.CommandText = "select * from product";
      mySqlCommand.Connection = sqlCnt;
      
      // 創建SqlDataAdapter
      SqlDataAdapter myDataAdapter = new SqlDataAdapter();
      myDataAdapter.SelectCommand = mySqlCommand;	// 為SqlDataAdapter對象綁定所要執行的SqlCommand對象

      上述SQL可以簡化為

      SqlConnection sqlCnt = new SqlConnection(connectString);
      sqlCnt.Open();
      // 隱藏了SqlCommand對象的定義,同時隱藏了SqlCommand對象與SqlDataAdapter對象的綁定
      SqlDataAdapter myDataAdapter = new SqlDataAdapter("select * from product", sqlCnt);
      屬性和方法
      • myDataAdapter.SelectCommand屬性:SqlCommand變量,封裝Select語句;
      • myDataAdapter.InsertCommand屬性:SqlCommand變量,封裝Insert語句;
      • myDataAdapter.UpdateCommand屬性:SqlCommand變量,封裝Update語句;
      • myDataAdapter.DeleteCommand屬性:SqlCommand變量,封裝Delete語句。
      • myDataAdapter.fill():將執行結果填充到Dataset中,會隱藏打開SqlConnection并執行SQL等操作。

      6.2 SqlCommandBuilder;

      命名空間:System.Data.SqlClient.SqlCommandBuilder。

      對DataSet的操作(更改、增加、刪除)僅是在本地修改,若要提交到“數據庫”中則需要SqlCommandBuilder對象。用于在客戶端編輯完數據后,整體一次更新數據。具體用法如下:

      SqlCommandBuilder mySqlCommandBuilder = new SqlCommandBuilder(myDataAdapter);  // 為myDataAdapter賦予SqlCommandBuilder功能
      myDataAdapter.Update(myDataSet, "表名");                   // 向數據庫提交更改后的DataSet,第二個參數為DataSet中的存儲表名,并非數據庫中真實的表名(二者在多數情況下一致)。
      

      6.3 DataSet

      命名空間:System.Data.DataSet。

      數據集,本地微型數據庫,可以存儲多張表。

      使用DataSet第一步就是將SqlDataAdapter返回的數據集(表)填充到Dataset對象中:

      SqlDataAdapter myDataAdapter = new SqlDataAdapter("select * from product", sqlCnt);
      DataSet myDataSet = new DataSet();		// 創建DataSet
      myDataAdapter.Fill(myDataSet, "product");	// 將返回的數據集作為“表”填入DataSet中,表名可以與數據庫真實的表名不同,并不影響后續的增、刪、改等操作
      ① 訪問DataSet中的數據
      SqlDataAdapter myDataAdapter = new SqlDataAdapter("select * from product", sqlCnt);
      DataSet myDataSet = new DataSet();
      myDataAdapter.Fill(myDataSet, "product");
      
      DataTable myTable = myDataSet.Tables["product"];
      foreach (DataRow myRow in myTable.Rows) {
          foreach (DataColumn myColumn in myTable.Columns) {
              Console.WriteLine(myRow[myColumn]);	//遍歷表中的每個單元格
          }
      }
      ② 修改DataSet中的數據
      SqlDataAdapter myDataAdapter = new SqlDataAdapter("select * from product", sqlCnt);
      DataSet myDataSet = new DataSet();
      myDataAdapter.Fill(myDataSet, "product");
      
      // 修改DataSet
      DataTable myTable = myDataSet.Tables["product"];
      foreach (DataRow myRow in myTable.Rows) {
          myRow["name"] = myRow["name"] + "商品";
      }
      
      // 將DataSet的修改提交至“數據庫”
      SqlCommandBuilder mySqlCommandBuilder = new SqlCommandBuilder(myDataAdapter);
      myDataAdapter.Update(myDataSet, "product");

      注意:在修改、刪除等操作中表product必須定義主鍵,select的字段中也必須包含主鍵,否則會提示“對于不返回任何鍵列信息的 SelectCommand,不支持 UpdateCommand 的動態 SQL 生成。”錯誤

      ③ 增加一行
      SqlDataAdapter myDataAdapter = new SqlDataAdapter("select * from product", sqlCnt);
      DataSet myDataSet = new DataSet();
      myDataAdapter.Fill(myDataSet, "product");
      DataTable myTable = myDataSet.Tables["product"];
      
      // 添加一行
      DataRow myRow = myTable.NewRow();
      myRow["name"] = "捷安特";
      myRow["price"] = 13.2;
      //myRow["id"] = 100; id若為“自動增長”,此處可以不設置,即便設置也無效
      myTable.Rows.Add(myRow);
      
      // 將DataSet的修改提交至“數據庫”
      SqlCommandBuilder mySqlCommandBuilder = new SqlCommandBuilder(myDataAdapter);
      myDataAdapter.Update(myDataSet, "product");
      ④ 刪除一行
      SqlDataAdapter myDataAdapter = new SqlDataAdapter("select * from product", sqlCnt);
      DataSet myDataSet = new DataSet();
      myDataAdapter.Fill(myDataSet, "product");
      
      // 刪除第一行
      DataTable myTable = myDataSet.Tables["product"];
      myTable.Rows[0].Delete();
      
      SqlCommandBuilder mySqlCommandBuilder = new SqlCommandBuilder(myDataAdapter);
      myDataAdapter.Update(myDataSet, "product");
      屬性
      • Tables:獲取包含在DataSet中的表的集合。
      • Relations:獲取用于將表鏈接起來并允許從父表瀏覽到子表的關系的集合。
      • HasEroors:表明是否已經初始化DataSet對象的值。
      方法
      • Clear清除DataSet對象中所有表的所有數據。
      • Clone復制DataSet對象的結構到另外一個DataSet對象中,復制內容包括所有的結構、關系和約束,但不包含任何數據。
      • Copy復制DataSet對象的數據和結構到另外一個DataSet對象中。兩個DataSet對象完全一樣。
      • CreateDataReader為每個DataTable對象返回帶有一個結果集的DataTableReader,順序與Tables集合中表的顯示順序相同。
      • Dispose釋放DataSet對象占用的資源。
      • Reset將DataSet對象初始化。

       

      7、釋放資源

      資源使用完畢后應及時關閉連接和釋放,具體方法如下:

      myDataSet.Dispose();        // 釋放DataSet對象
      myDataAdapter.Dispose();    // 釋放SqlDataAdapter對象
      myDataReader.Dispose();     // 釋放SqlDataReader對象
      sqlCnt.Close();             // 關閉數據庫連接
      sqlCnt.Dispose();           // 釋放數據庫連接對象
      
      轉自:http://www.cnblogs.com/rainman/archive/2012/03/13/2393975.html
       
      分類: c#

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