C#数据库操作的三种经典用法

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，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();

　　}

　　}

　　}

　　以上的程序概括了最典型的用法,也是最基本的用法.更多的用法我将会陆续给出,大家有什么疑问或建议,欢迎来信(jiangbiao0827@163.com)或留言。