C#数据库操作的3种典型用法

长平狐 发布于 2013/01/06 11:25
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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#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 "a",DatabaseName is "b",UserName is "c", Password is "d"

        private string sqlConnectionCommand = "Data Source=a;Initial Catalog=b;User ID=c;Pwd=d";

 

        //This table contains two columns:KeywordID int not null,KeywordName varchar(100) not null

        private string dataTableName = "Basic_Keyword_Test";

         //sqlUpdateCommand could contain "insert" , "delete" , "update" operate

        private string sqlSelectCommand = "Select KeywordID, KeywordName From Basic_Keyword_Test";

        private string storedProcedureName = "Insert To Basic_Keyword_Test";

        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. 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

 

 

声明:本贴为转帖,原文地址:http://www.knowsky.com/345354.html


原文链接:http://blog.csdn.net/sunboy_2050/article/details/4448990
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