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#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,

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

原文： C#数据库操作的3种典型用法