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 "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();
}
}
}
以上的程序概括了最典型的用法,也是最基本的用法.更多的用法我将会陆续给出,大家有什么疑问或建议,欢迎来信(jiangbiao0827@163.com)或留言.关于SQL Server的使用和心得,我也会在近期在DataBase区给出.
