C#数据库操作的用法_C#

C#数据库操作的用法

2021-11-01 13:33C#教程网 C#

这篇文章主要介绍了C#数据库操作的三种经典用法

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，源码如下：

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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(); 
} 
} 
} 