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();


}


}


}