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DBHelper.cs
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DBHelper.cs
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using System;
using System.Data;
using System.Configuration;
using System.Linq;
using System.Web;
//using System.Web.Security;
//using System.Web.UI;
//using System.Web.UI.HtmlControls;
//using System.Web.UI.WebControls;
//using System.Web.UI.WebControls.WebParts;
using System.Xml.Linq;
using System.Data.SqlClient;
namespace CARDAL
{
public class DbHelp
{
public DbHelp()
{
//
//TODO: 在此处添加构造函数逻辑
//
}
private static SqlConnection connection;
public static SqlConnection Connection
{
get
{
string connectionString = ConfigurationManager.ConnectionStrings["CAR"].ConnectionString;
if (connection == null)
{
connection = new SqlConnection(connectionString);
connection.Open();
}
else if (connection.State == System.Data.ConnectionState.Closed)
{
connection.Open();
}
else if (connection.State == System.Data.ConnectionState.Broken)
{
connection.Close();
connection.Open();
}
return connection;
}
}
public static void GetExecuteNonQuery(string sql, params SqlParameter[] values)
{
SqlCommand cm = new SqlCommand(sql, Connection);
cm.Parameters.AddRange(values);
cm.ExecuteNonQuery();
}
public static void GetExecuteNonQuery(string sql)
{
SqlCommand cm = new SqlCommand(sql, Connection);
cm.ExecuteNonQuery();
connection.Close();
}
public static int ExecuteCommand(string safeSql)
{
SqlCommand cmd = new SqlCommand(safeSql, Connection);
int result = cmd.ExecuteNonQuery();
return result;
}
public static int ExecuteCommand(string sql, params SqlParameter[] values)
{
SqlCommand cmd = new SqlCommand(sql, Connection);
cmd.Parameters.AddRange(values);
return cmd.ExecuteNonQuery();
}
public static int GetScalar(string safeSql)
{
SqlCommand cmd = new SqlCommand(safeSql, Connection);
int result = Convert.ToInt32(cmd.ExecuteScalar());
return result;
}
public static int GetScalar(string sql, params SqlParameter[] values)
{
SqlCommand cmd = new SqlCommand(sql, Connection);
cmd.Parameters.AddRange(values);
int result = Convert.ToInt32(cmd.ExecuteScalar());
return result;
}
public static SqlDataReader GetReader(string safeSql)
{
SqlCommand cmd = new SqlCommand(safeSql, Connection);
SqlDataReader reader = cmd.ExecuteReader();
return reader;
}
public static SqlDataReader GetReader(string sql, params SqlParameter[] values)
{
SqlCommand cmd = new SqlCommand(sql, Connection);
cmd.Parameters.AddRange(values);
SqlDataReader reader = cmd.ExecuteReader();
return reader;
}
public static DataTable GetDataTable(string safeSql)
{
DataSet ds = new DataSet();
SqlCommand cmd = new SqlCommand(safeSql, Connection);
SqlDataAdapter da = new SqlDataAdapter(cmd);
da.Fill(ds);
return ds.Tables[0];
}
public static DataTable GetDataTable(string sql, params SqlParameter[] values)
{
DataSet ds = new DataSet();
SqlCommand cmd = new SqlCommand(sql, Connection);
cmd.Parameters.AddRange(values);
SqlDataAdapter da = new SqlDataAdapter(cmd);
da.Fill(ds);
return ds.Tables[0];
}
}
}