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C#数据库操作的三种经典用法

【IT168 技术文档】

    由于最近和数据库打交道,需要用C#和SQL Server 2005进行操作,就把近段时间内的最常用的操作做个总结。本人也是第一次用C#操作数据库,所以这三种典型用法对初学者还是挺有帮助的。

    以下是我在visual studio 2005上写的一个类(连的是SQL Server 2005),已经过测试通过。里面有3个方法比较典型,源码如下:

using System; using System.Collections.Generic; using System.Text; using System.Data; using System.Data.SqlClient; namespace DatabaseOperate {  class SqlOperateInfo  {   //Suppose your ServerName is "aa",DatabaseName is "bb",UserName is "cc", Password is "dd"   private string sqlConnectionCommand = "Data Source=aa;Initial Catalog=bb;User ID=cc;Pwd=dd";   //This table contains two columns:KeywordID int not null,KeywordName varchar(100) not null   private string dataTableName = "Basic_Keyword_Test";   private string storedProcedureName = "Sp_InertToBasic_Keyword_Test";   private string sqlSelectCommand = "Select KeywordID, KeywordName From Basic_Keyword_Test";   //sqlUpdateCommand could contain "insert" , "delete" , "update" operate   private string sqlUpdateCommand = "Delete From Basic_Keyword_Test Where KeywordID = 1";   public void UseSqlReader()   {    SqlConnection sqlConnection = new SqlConnection(sqlConnectionCommand);    SqlCommand sqlCommand = new SqlCommand();    sqlCommand.CommandType = System.Data.CommandType.Text;    sqlCommand.Connection = sqlConnection;    sqlCommand.CommandText = sqlSelectCommand;    sqlConnection.Open();    SqlDataReader sqlDataReader = sqlCommand.ExecuteReader();    while(sqlDataReader.Read())    {     //Get KeywordID and KeywordName , You can do anything you like. Here I just output them.     int keywordid = (int)sqlDataReader[0];     //the same as: int keywordid = (int)sqlDataReader["KeywordID"]     string keywordName = (string)sqlDataReader[1];     //the same as: string keywordName = (int)sqlDataReader["KeywordName"]     Console.WriteLine("KeywordID = " + keywordid + " , KeywordName = " + keywordName);    }    sqlDataReader.Close();    sqlCommand.Dispose();    sqlConnection.Close();   }   public void UseSqlStoredProcedure()   {    SqlConnection sqlConnection = new SqlConnection(sqlConnectionCommand);    SqlCommand sqlCommand = new SqlCommand();    sqlCommand.CommandType = CommandType.StoredProcedure;    sqlCommand.Connection = sqlConnection;    sqlCommand.CommandText = storedProcedureName;    sqlConnection.Open();    sqlCommand.ExecuteNonQuery();    //you can use reader here,too.as long as you modify the sp and let it like select * from ....    sqlCommand.Dispose();    sqlConnection.Close();   }   public void UseSqlDataSet()   {    SqlConnection sqlConnection = new SqlConnection(sqlConnectionCommand);    SqlCommand sqlCommand = new SqlCommand();    sqlCommand.CommandType = System.Data.CommandType.Text;    sqlCommand.Connection = sqlConnection;    sqlCommand.CommandText = sqlSelectCommand;    sqlConnection.Open();    SqlDataAdapter sqlDataAdapter = new SqlDataAdapter();    sqlDataAdapter.SelectCommand = sqlCommand;    DataSet dataSet = new DataSet();    //sqlCommandBuilder is for update the dataset to database    SqlCommandBuilder sqlCommandBuilder = new SqlCommandBuilder(sqlDataAdapter);    sqlDataAdapter.Fill(dataSet, dataTableName);    //Do something to dataset then you can update it to  Database.Here I just add a row    DataRow row = dataSet.Tables[0].NewRow();    row[0] = 10000;    row[1] = "new row";    dataSet.Tables[0].Rows.Add(row);    sqlDataAdapter.Update(dataSet, dataTableName);    sqlCommand.Dispose();    sqlDataAdapter.Dispose();    sqlConnection.Close();   }  } }



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