SqlHelper2

 public abstract class DBHelper
     {
         public static string connectionString = @"DATA SOURCE=.\sqldata;UID=sa;PWD=bkin123;DATABASE=bkintest";//ConfigurationManager.ConnectionStrings["database"].ConnectionString;
         public DBHelper()
         {
            //connectionString = @"DATA SOURCE=(local);UID=sa;PWD=sa;DATABASE=db";
         }

         #region 不带参数
         //执行不带参数数据记录的增、删、改操作，并返回执行后的结果值
         public static int ExecuteCommand(string safeSql)
         {
             using (SqlConnection connection = new SqlConnection(connectionString))
             {
                 using (SqlCommand cmd = new SqlCommand(safeSql, connection))
                 {
                     try
                     {
                         connection.Open();
                         int result = cmd.ExecuteNonQuery();
                         return result;
                     }
                     catch (System.Data.SqlClient.SqlException e)
                     {
                         connection.Close();
                         throw e;
                     }
                 }
             }
         }

         //返回执行不带参数SQL语句后中结果集的第一行第一列
         public static object GetScalar(string safeSql)
         {
             using (SqlConnection connection = new SqlConnection(connectionString))
             {
                 using (SqlCommand cmd = new SqlCommand(safeSql, connection))
                 {
                     try
                     {
                         connection.Open();
                         object result = cmd.ExecuteScalar();
                         return result;
                     }
                     catch (System.Data.SqlClient.SqlException e)
                     {
                         connection.Close();
                         throw e;
                     }
                 }
             }
         }

         //返回执行不带参数SQL语句后的结果数据表
         public static DataTable GetDataTable(string safeSql)
         {
             using (SqlConnection connection = new SqlConnection(connectionString))
             {
                 using (SqlCommand cmd = new SqlCommand(safeSql, connection))
                 {
                     try
                     {
                         connection.Open();
                         DataSet ds = new DataSet();
                         SqlDataAdapter da = new SqlDataAdapter(cmd);
                         da.Fill(ds);
                         return ds.Tables[];
                     }
                     catch (System.Data.SqlClient.SqlException e)
                     {
                         connection.Close();
                         throw e;
                     }
                 }
             }
         }
         #endregion

         #region 带参数
         //执行带参数数据记录的增、删、改操作，返回执行后的结果值
         public static int ExecuteCommand(string safeSql, params SqlParameter[] values)
         {
             using (SqlConnection connection = new SqlConnection(connectionString))
             {
                 using (SqlCommand cmd = new SqlCommand(safeSql, connection))
                 {
                     try
                     {
                         connection.Open();
                         cmd.Parameters.AddRange(values);
                         return cmd.ExecuteNonQuery();
                     }
                     catch (System.Data.SqlClient.SqlException e)
                     {
                         connection.Close();
                         throw e;
                     }
                 }
             }
         }

         //返回执行带参数SQL语句后中结果集的第一行第一列
         public static object GetScalar(string safeSql, params SqlParameter[] values)
         {
             using (SqlConnection connection = new SqlConnection(connectionString))
             {
                 using (SqlCommand cmd = new SqlCommand(safeSql, connection))
                 {
                     try
                     {
                         connection.Open();
                         cmd.Parameters.AddRange(values);
                         object result = cmd.ExecuteScalar();
                         return result;
                     }
                     catch (System.Data.SqlClient.SqlException e)
                     {
                         connection.Close();
                         throw e;
                     }
                 }
             }
         }

         //返回执行带参数SQL语句后的结果数据表
         public static DataTable GetDataTable(string safeSql, params SqlParameter[] values)
         {
             using (SqlConnection connection = new SqlConnection(connectionString))
             {
                 using (SqlCommand cmd = new SqlCommand(safeSql, connection))
                 {
                     try
                     {
                         connection.Open();
                         DataSet ds = new DataSet();
                         cmd.Parameters.AddRange(values);
                         SqlDataAdapter da = new SqlDataAdapter(cmd);
                         da.Fill(ds);
                         return ds.Tables[];
                     }
                     catch (System.Data.SqlClient.SqlException e)
                     {
                         connection.Close();
                         throw e;
                     }
                 }
             }
         }
         #endregion
     }