龙网论坛

 找回密码
 注册
查看: 4314|回复: 0
收起左侧

C#数据库操作的三种用法技巧

[复制链接]
发表于 2011-9-22 18:29 | 显示全部楼层 |阅读模式
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=ccwd=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";
//方法一
  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();
  }

//方法二
  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();
  }
//方法三
  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();
  }
 }
}
您需要登录后才可以回帖 登录 | 注册

本版积分规则

小黑屋|手机版|Archiver|龙网论坛 ( 辽ICP备06014320号 )

GMT+8, 2022-10-1 17:01

Powered by Discuz! X3.4

Copyright © 2001-2021, Tencent Cloud.

快速回复 返回顶部 返回列表