.NET连接数据库的通用类

using System;
using System.Collections.Generic;
using System.Text;
using System.Data;
using System.Data.SqlClient;
using System.Configuration;
/********************************
* 类名：DBHelper
* 功能描述：连接数据库
* ******************************/
namespace HotelManager.DAL
{
public static class DBHelper
{
#region private Members 从配置文件中读取数据库连接字符串
/// <summary>
/// 返回Connection对象
/// </summary>
private static SqlConnection connection;

public static SqlConnection Connection
{
get
{
string connString = ConfigurationManager.ConnectionStrings["HotelManagerConnString"].ConnectionString;

if (connection == null)
{
connection = new SqlConnection(connString);
connection.Open();
}
else if (connection.State == ConnectionState.Closed)
{
connection.Open();
}
else if (connection.State == ConnectionState.Broken)
{
connection.Close();
connection.Open();
}
return connection;
}
}

public static string dboOwner=ConfigurationManager.ConnectionStrings["DataBaseOwner"].ConnectionString;

#endregion

#region ExecuteCommand 执行带参数的SQL命令
/// <summary>
/// 执行带参数的SQL命令
/// </summary>
/// <param name="sql"></param>
/// <returns></returns>
public static int ExecuteCommand(string sql,params SqlParameter[] values)
{
SqlCommand command = new SqlCommand(dboOwner + sql, Connection);
command.CommandType = CommandType.StoredProcedure;
if (values != null)
command.Parameters.AddRange(values);

int result = command.ExecuteNonQuery();
return result;
}
#endregion

#region GetReader 执行带参数的SQL命令,返回SqlDataReader对象
/// <summary>
/// 执行SQL命令,返回SqlDataReader对象
/// </summary>
/// <param name="sql"></param>
/// <returns></returns>
public static SqlDataReader GetReader(string sql,params SqlParameter[] values)
{
SqlCommand command = new SqlCommand(dboOwner + sql, Connection);
command.CommandType = CommandType.StoredProcedure;
if (values != null)
command.Parameters.AddRange(values);

SqlDataReader reader = command.ExecuteReader();
return reader;
}
#endregion

#region GetScalar 执行带参数的SQL命令,返回结果中的第一行第一列
/// <summary>
/// 执行带参数的SQL命令,返回结果中的第一行第一列
/// </summary>
/// <param name="sql"></param>
/// <returns></returns>
public static int GetScalar(string sql,params SqlParameter[] values)
{
SqlCommand command = new SqlCommand(dboOwner + sql, Connection);
command.CommandType = CommandType.StoredProcedure;
if (values != null)
command.Parameters.AddRange(values);

int result = command.ExecuteNonQuery();
return result;
}
#endregion

#region GetDataSet 执行带参数的SQL命令,返回DataTable对象
/// <summary>
/// 执行SQL命令,返回DataTable对象
/// </summary>
/// <param name="sql"></param>
/// <returns></returns>
public static DataTable GetDataSet(string sql,params SqlParameter[] values)
{
DataSet ds = new DataSet();
SqlCommand command = new SqlCommand(dboOwner + sql, Connection);
command.CommandType = CommandType.StoredProcedure;

if (values != null)
command.Parameters.AddRange(values);

SqlDataAdapter adapter = new SqlDataAdapter(command);
adapter.Fill(ds);
return ds.Tables[0];
}
#endregion
}
}