C#数据库操作的3种典型用法

       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,在此把源码贴出:

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();         }     } }

 

 

【责编:Peng】