asp.net DBHelper类

 

代码

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

namespace  ZhiDianDAL
{
     public   class  DBHelper
    {
         ///   <summary>
         ///  数据库连接对象
         ///   </summary>
         private  SqlConnection con;

         public  DBHelper()
        {
            con  =  CreateConnection();
        }

         ///   <summary>
         ///  创建数据库连接对象
         ///   </summary>
         ///   <returns></returns>
         public  SqlConnection CreateConnection()
        {
             string  conStr  =  ConfigurationManager.ConnectionStrings[ " sqlconnectionstring " ].ToString();
             return   new  SqlConnection(conStr);
        }

         ///   <summary>
         ///  创建执行存储过程的command对象
         ///   </summary>
         ///   <param name="storedProcedure"></param>
         ///   <returns></returns>
         public  SqlCommand GetStoredProcCommand( string  procName)
        {
            SqlCommand cmd  =  con.CreateCommand();
            cmd.CommandText  =  procName;
            cmd.CommandType  =  CommandType.StoredProcedure;
             return  cmd;
        }

         ///   <summary>
         ///  创建执行普通sql语句的command对象
         ///   </summary>
         ///   <param name="sqlStr"></param>
         ///   <returns></returns>
         public  SqlCommand GetSqlStringCommand( string  sqlStr)
        {
            SqlCommand cmd  =  con.CreateCommand();
            cmd.CommandText  =  sqlStr;
            cmd.CommandType  =  CommandType.Text;
             return  cmd;
        }

         ///   <summary>
         ///  增加参数
         ///   </summary>
         ///   <param name="cmd"></param>
         ///   <param name="dbParameterCollection"></param>
         public   void  AddParameter(SqlCommand cmd, List < SqlParameter >  list)
        {
             foreach  (SqlParameter param  in  list)
            {
                cmd.Parameters.Add(param);
            }
        }

         ///   <summary>
         ///  给存储过程增加输入参数
         ///   </summary>
         ///   <param name="cmd"></param>
         ///   <param name="parameterName"></param>
         ///   <param name="dbType"></param>
         ///   <param name="value"></param>
         public   void  AddInParameter(SqlCommand cmd,  string  parameterName, DbType dbType,  object  value)
        {
            SqlParameter dbParameter  =  cmd.CreateParameter();
            dbParameter.DbType  =  dbType;
            dbParameter.ParameterName  =  parameterName;
            dbParameter.Value  =  value;
            dbParameter.Direction  =  ParameterDirection.Input;
            cmd.Parameters.Add(dbParameter);
        }

         ///   <summary>
         ///  给存储过程增加返回参数
         ///   </summary>
         ///   <param name="cmd"></param>
         ///   <param name="parameterName"></param>
         ///   <param name="dbType"></param>
         public   void  AddReturnParameter(SqlCommand cmd,  string  parameterName, DbType dbType)
        {
            SqlParameter dbParameter  =  cmd.CreateParameter();
            dbParameter.DbType  =  dbType;
            dbParameter.ParameterName  =  parameterName;
            dbParameter.Direction  =  ParameterDirection.ReturnValue;
            cmd.Parameters.Add(dbParameter);
        }

         ///   <summary>
         ///  取得参数
         ///   </summary>
         ///   <param name="cmd"></param>
         ///   <param name="parameterName"></param>
         ///   <returns></returns>
         public  SqlParameter GetParameter(SqlCommand cmd,  string  parameterName)
        {
             return  cmd.Parameters[parameterName];
        }


         ///   <summary>
         ///  执行返回DataTable
         ///   </summary>
         ///   <param name="cmd"></param>
         ///   <returns></returns>
         public  DataTable ExecuteDataTable(SqlCommand cmd)
        {
             try
            {
                SqlDataAdapter adapter  =   new  SqlDataAdapter();
                adapter.SelectCommand  =  cmd;
                DataTable dataTable  =   new  DataTable();
                adapter.Fill(dataTable);
                 return  dataTable;
            }
             catch  (Exception ex)
            {

                 throw  ex;
            }

        }

         ///   <summary>
         ///  执行返回受影响行数
         ///   </summary>
         ///   <param name="cmd"></param>
         ///   <returns></returns>
         public   int  ExecuteNonQuery(SqlCommand cmd)
        {
             int  count  =   0 ;
             try
            {
                cmd.Connection.Open();
                count  =  cmd.ExecuteNonQuery();
            }
             catch  (Exception ex)
            {
                 throw  ex;
            }
             finally
            {
                cmd.Connection.Close();
            }
             return  count;
        }

         ///   <summary>
         ///  执行返回首行首列的值
         ///   </summary>
         ///   <param name="cmd"></param>
         ///   <returns></returns>
         public   object  ExecuteScalar(SqlCommand cmd)
        {
            Object obj  =   null ;
             try
            {
                cmd.Connection.Open();
                obj  =  cmd.ExecuteScalar();
            }
             catch  (Exception ex)
            {

                 throw  ex;
            }
             finally
            {
                cmd.Connection.Close();
            }
             return  obj;
        }

    }
}