C#資料庫操作的3種典型用法

由於最近和資料庫打交道,需要用C#和SQL Server 2005進行操作,就把近段時間內的最常用的操作做個總結.本人也是第一次用C#操作資料庫,所以這三種典型用法對初學者還是挺有協助的.
       以下是我在visual studio 2005上寫的一個類(連的是SQL Server 2005),已經過測試通過.裡面有3個方法比較典型,在此把源碼貼出:
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();
        }
    }
}
 
以上的程式概括了最典型的用法,也是最基本的用法.更多的用法我將會陸續給出,大家有什麼疑問或建議,歡迎來信(jiangbiao0827@163.com)或留言.關於SQL Server的使用和心得,我也會在近期在DataBase區給出.

原文：http://www.knowsky.com/345354.html