ADO.NET朝花夕拾(三) 之DBHelper

这个类大家肯定很熟悉了,但是知其然一定要知其所以然,希望该系列能让我回顾一下ADO.NET

using  System;
using  System.Collections.Generic;
using  System.Text;
using  System.Configuration;
using  System.Data;
using  System.Data.SqlClient;

namespace  Food.DAL
{
     public   class  DBHelper
    {


         private   static   string  connectionString  =  ConfigurationManager.ConnectionStrings[ " conString " ].ConnectionString;

         public   static   int  ExecuteCommand( string  safeSql)
        {
             using  (SqlConnection con  =   new  SqlConnection(connectionString))
            {
                 using  (SqlCommand cmd  =   new  SqlCommand(safeSql, con))
                {
                    con.Open();
                     int  result  =  cmd.ExecuteNonQuery();
                     return  result;
                }
            }

        }

         public   static   int  ExecuteCommand( string  sql,  params  SqlParameter[] values)
        {
             using  (SqlConnection con  =   new  SqlConnection(connectionString))
            {
                 using  (SqlCommand cmd  =   new  SqlCommand(sql, con))
                {
                    con.Open();
                    cmd.Parameters.AddRange(values);
                     return  cmd.ExecuteNonQuery();
                }
            }

        }

         public   static   int  GetScalar( string  safeSql)
        {


             using  (SqlConnection con  =   new  SqlConnection(connectionString))
            {
                 using  (SqlCommand cmd  =   new  SqlCommand(safeSql, con))
                {
                    con.Open();
                     int  result  =  Convert.ToInt32(cmd.ExecuteScalar());
                     return  result;
                }
            }
        }

         public   static   int  GetScalar( string  sql,  params  SqlParameter[] values)
        {

             using  (SqlConnection con  =   new  SqlConnection(connectionString))
            {
                 using  (SqlCommand cmd  =   new  SqlCommand(sql, con))
                {
                    con.Open();
                    cmd.Parameters.AddRange(values);
                     int  result  =  Convert.ToInt32(cmd.ExecuteScalar());
                     return  result;
                }
            }

        }

         ///   <summary>
         ///  查看新的数量
         ///   </summary>
         ///   <param name="sql"></param>
         ///   <param name="values"></param>
         ///   <returns></returns>
         public   static   object  GetScalarWithNewCon( string  sql,  params  SqlParameter[] values)
        {
             using  (SqlConnection con  =   new  SqlConnection(connectionString))
            {

                 using  (SqlCommand cmd  =   new  SqlCommand(sql, con))
                {
                    con.Open();
                    cmd.Parameters.AddRange(values);
                     return  cmd.ExecuteScalar();

                }
            }
        }

         public   static   string  GetScalarString( string  sql)
        {

             using  (SqlConnection con  =   new  SqlConnection(connectionString))
            {
                 using  (SqlCommand cmd  =   new  SqlCommand(sql, con))
                {
                    con.Open();
                     string  result  =  cmd.ExecuteScalar().ToString();
                     return  result;
                }
            }

        }

         public   static  SqlDataReader GetReader( string  safeSql)
        {
            SqlConnection con  =   new  SqlConnection(connectionString);
             using  (SqlCommand cmd  =   new  SqlCommand(safeSql, con))
            {
                con.Open();
                SqlDataReader reader  =  cmd.ExecuteReader();
                 return  reader;
            }

        }

         public   static  SqlDataReader GetReader( string  sql,  params  SqlParameter[] values)
        {
            SqlConnection con  =   new  SqlConnection(connectionString);
             using  (SqlCommand cmd  =   new  SqlCommand(sql, con))
            {
                con.Open();
                cmd.Parameters.AddRange(values);
                SqlDataReader reader  =  cmd.ExecuteReader();
                 return  reader;
            }


        }

         public   static  DataTable GetTable( string  safeSql)
        {
             using  (SqlConnection con  =   new  SqlConnection(connectionString))
            {

                 using  (SqlCommand cmd  =   new  SqlCommand(safeSql, con))
                {
                    con.Open();
                    DataSet ds  =   new  DataSet();
                    SqlDataAdapter da  =   new  SqlDataAdapter(cmd);
                    da.Fill(ds);
                     return  ds.Tables[ 0 ];
                }
            }
        }


         public   static  DataTable GetTable( string  sql,  params  SqlParameter[] values)
        {

             using  (SqlConnection con  =   new  SqlConnection(connectionString))
            {

                 using  (SqlCommand cmd  =   new  SqlCommand(sql, con))
                {
                    con.Open();
                    DataSet ds  =   new  DataSet();
                    cmd.Parameters.AddRange(values);
                    SqlDataAdapter da  =   new  SqlDataAdapter(cmd);
                    da.Fill(ds);
                     return  ds.Tables[ 0 ];
                }
            }

        }

         public   static  DataSet GetDataSet( string  sql)
        {
             using  (SqlConnection con  =   new  SqlConnection(connectionString))
            {
                 using  (SqlCommand cmd  =   new  SqlCommand(sql, con))
                {
                    con.Open();
                    DataSet ds  =   new  DataSet();
                    SqlDataAdapter da  =   new  SqlDataAdapter(cmd);
                    da.Fill(ds);
                     return  ds;
                }

            }

        }

         public   static  DataSet GetDataSet( string  sql,  params  SqlParameter[] values)
        {

             using  (SqlConnection con  =   new  SqlConnection(connectionString))
            {
                 using  (SqlCommand cmd  =   new  SqlCommand(sql, con))
                {
                    con.Open();
                    DataSet ds  =   new  DataSet();
                    cmd.Parameters.AddRange(values);
                    SqlDataAdapter da  =   new  SqlDataAdapter(cmd);
                    da.Fill(ds);
                     return  ds;
                }

            }

        }




         ///   <summary>
         ///  执行存储过程
         ///   </summary>
         ///   <param name="storedProcName"></param>
         ///   <param name="parameters"></param>
         ///   <returns></returns>
         public   static  SqlDataReader RunProcedure( string  storedProcName, IDataParameter[] parameters)
        {
            SqlConnection con  =   new  SqlConnection(connectionString);
            SqlDataReader returnReader;
            con.Open();
            SqlCommand command  =  BuildQueryCommand(con, storedProcName, parameters);
            command.CommandType  =  CommandType.StoredProcedure;

            returnReader  =  command.ExecuteReader();
             return  returnReader;
        }
         ///   <summary>
         ///  执行存储过程
         ///   </summary>
         ///   <param name="storedProcName"></param>
         ///   <param name="parameters"></param>
         ///   <returns></returns>
         public   static  DataTable RunProcedureTable( string  storedProcName, IDataParameter[] parameters)
        {
             using  (SqlConnection con  =   new  SqlConnection(connectionString))
            {
                con.Open();
                DataSet dsSet  =   new  DataSet();
                SqlDataAdapter sqlDa  =   new  SqlDataAdapter(storedProcName, con);
                sqlDa.SelectCommand.CommandType  =  CommandType.StoredProcedure;
                sqlDa.SelectCommand.Parameters.AddRange(parameters);
                sqlDa.Fill(dsSet);

                 return  dsSet.Tables[ 0 ];
            }
        }
         ///   <summary>
         ///  为存储过程添加参数
         ///   </summary>
         ///   <param name="connection"></param>
         ///   <param name="storedProcName"></param>
         ///   <param name="parameters"></param>
         ///   <returns></returns>
         private   static  SqlCommand BuildQueryCommand(SqlConnection connection,  string  storedProcName, IDataParameter[] parameters)
        {

             using  (SqlCommand command  =   new  SqlCommand(storedProcName, connection))
            {
                command.CommandType  =  CommandType.StoredProcedure;
                 if  (parameters  !=   null )
                {
                     foreach  (SqlParameter parameter  in  parameters)
                    {
                        command.Parameters.Add(parameter);
                    }
                }
                 return  command;
            }

        }

    }
}