给我留言 | 加入收藏 | 设为首页 | 会员中心 | 我要投稿 | RSS
| PHP | ASP | JAVA | .NET | FLASH | AJAX | MYSQL | PGSQL | MSSQL | DB2 | ORACLE | SYBASE | Html/Css | 服务器相关 | IOS |
您当前的位置:首页 > WEb开发 > .NET

C#数据库操作的三种经典用法

时间:2009-11-14 17:49:41  来源:互联网  作者:未知
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();
  }
 }
}
来顶一下
返回首页
返回首页
发表评论 共有条评论
用户名: 密码:
验证码: 匿名发表
推荐资讯
相关文章
栏目更新
栏目热门