using System;
using System.Collections.Generic;
using System.Linq;
using System.Web;
using System.Data.SqlClient;
using System.Data;
/// <summary>
///DBHelp 的摘要说明
/// </summary>
public class DBHelp
{
public DBHelp()
{
}
public static string conn = "server=.;Database=sydata;User Id=sa;Password=439625..";
/// <summary>
/// 返回离线数据集
/// </summary>
/// <param name="sql"></param>
/// <returns></returns>
public static DataSet GetDataSet(string sql)
{
DataSet set;
using (SqlConnection sqlcon = new SqlConnection(conn))
{
sqlcon.Open();
SqlCommand sqlcom = new SqlCommand(sql, sqlcon);
SqlDataAdapter sqlda = new SqlDataAdapter(sqlcom);
set = new DataSet();
sqlda.Fill(set);
}
return set;
}
/// <summary>
/// 增删改查
/// </summary>
/// <param name="sql"></param>
/// <returns></returns>
public static int GetEx(string sql)
{
int i;
using (SqlConnection con = new SqlConnection(conn))
{
con.Open();
SqlCommand com = new SqlCommand(sql, con);
i = com.ExecuteNonQuery();
}
return i;
}
/// <summary>
/// 返回首行
/// </summary>
/// <param name="sql"></param>
/// <returns></returns>
public static object GetEs(string sql)
{
object i;
using (SqlConnection con = new SqlConnection(conn))
{
con.Open();
SqlCommand com = new SqlCommand(sql, con);
i = com.ExecuteScalar();
}
return i;
}
/// <summary>
/// 执行数据库操作返回DataReader
/// </summary>
/// <param name="sql"></param>
/// <returns></returns>
public static SqlDataReader GetDr(string sql)
{
SqlDataReader dr;
SqlConnection con = new SqlConnection(conn);
con.Open();
SqlCommand com = new SqlCommand(sql, con);
dr = com.ExecuteReader(CommandBehavior.CloseConnection);//CommandBehavior.CloseConnection
return dr;
}
}