C#的数据连接 对数据的操作

using System;
using System.Data;
using System.Configuration;
using System.Web;
using System.Web.Security;
using System.Web.UI;
using System.Web.UI.WebControls;
using System.Web.UI.WebControls.WebParts;
using System.Web.UI.HtmlControls;
using System.Data.SqlClient;
using AHUT_TetWebERP;

/// <summary>
/// DataBase 的摘要说明
/// </summary>
public class DataBase
{
    SqlConnection conn = null;
    SqlDataAdapter adapter = null;
    SqlCommand command = null;
    SqlDataReader reader = null;
    DataSet ds = null;

 public DataBase()
 {
  //
  // TODO: 在此处添加构造函数逻辑
  //
 }

    /// <summary>
    /// 数据库连接
    /// </summary>
    public void connection()
    {
        conn = new SqlConnection(ConfigurationManager.ConnectionStrings["BWConnectionString"].ToString());
        conn.Open();
    }

    /// <summary>
    /// 关闭数据库连接
    /// </summary>
    public void CloseConnection()
    {
        if (conn != null)
            conn.Close();
    }

    /// <summary>
    /// 返回数据记录集DataSet
    /// <param name="sql">适配器的数据查询语句</param>
    /// </summary>
    public DataSet returnRecordset(string sql)
    {
        try
        {
            adapter = new SqlDataAdapter(sql, conn);
            ds = new DataSet();
            adapter.Fill(ds);
        }
        catch(Exception ex)
        {
            SystemError.SystemLog(ex.Message);
        }
        return ds;
    }

    /// <summary>
    /// 判断是否存在满足SQL查询条件的记录
    /// <param name="sql">数据查询语句</param>
    /// </summary>
    public bool ExtenRow(string sql)
    {
        command = new SqlCommand(sql, conn);
        try
        {
            reader = command.ExecuteReader();
            if (reader.Read())
            {
                reader.Close();
                reader.Dispose();
                return true;
            }
            else
            {
                reader.Close();
                reader.Dispose();
                return false;
            }
        }
        catch
        {
            return false;
        }
    }

    /// <summary>
    /// 执行操作数据库的SQL语句
    /// <param name="sql">数据操作语句</param>
    /// </summary>
    public void SqlOperate(string sql)
    {
        command = new SqlCommand(sql, conn);
        try
        {
            command.ExecuteNonQuery();
        }
        catch (Exception ex)
        {
            SystemError.SystemLog(ex.Message);
        }
    }

/// <summary>
/// 仅执行command操作
/// </summary>
/// <param name="sql"></param>

    public void SqlCommd(string sql)
    {
        command = new SqlCommand(sql, conn);
    }

    public void getReader(ref SqlDataReader reader, string sql)
    {
        command = new SqlCommand(sql, conn);
        reader = command.ExecuteReader();
    }

    /// <summary>
    /// 销毁SqlDateReader数据
    /// </summary>
    /// <param name="reader">需要销毁的SqlDateReader数据对象</param>
    public void DisposeReader(ref SqlDataReader reader)
    {
        reader.Close();
        reader.Dispose();
    }

    /// <summary>
    /// 执行不带参数的存储过程返回一个整数
    /// </summary>
    /// <param name="procName">存储过程的名称</param>
    /// <returns>返回存储过程的返回值</returns>
    public int ExcuteProc(string procName)
    {
        command = CreateCommand(procName, null);
        try
        {
            command.ExecuteNonQuery();
        }
        catch (Exception ex)
        {
            SystemError.SystemLog(ex.Message);                      //执行错误时写入日志
        }
        finally
        {
            conn.Close();
        }
        return (int)command.Parameters["ReturnValue"].Value;   //返回存储过程的返回值
    }

    /// <summary>
    /// 执行带参数的存储过程返回一个整数
    /// </summary>
    /// <param name="procName">存储过程的名称</param>
    /// <param name="procName">存储过程所需参数</param>
    /// <returns>返回存储过程的返回值</returns>
    public int ExcuteProc(string procName,SqlParameter[] prams)
    {
        command = CreateCommand(procName, prams);
        try
        {
            command.ExecuteNonQuery();
        }
        catch (Exception ex)
        {
            SystemError.SystemLog(ex.Message);                      //执行错误时写入日志
        }
        finally
        {
            conn.Close();
        }
         return (int)command.Parameters["ReturnValue"].Value;   //返回存储过程的返回值
    }

    /// <summary>
    /// 执行不带参数的存储过程，可保存从数据库中获取的结果
    /// </summary>
    /// <param name="procName">存储过程的名称</param>
    /// <returns>返回存储过程的返回值</returns>
    public void ExcuteProc(string procName, out SqlDataReader reader)
    {
        command = CreateCommand(procName, null);
        reader = command.ExecuteReader(CommandBehavior.CloseConnection);
    }

    /// <summary>
    /// 执行带参数的存储过程,可保存从数据库中获取的结果
    /// </summary>
    /// <param name="procName">存储过程的名称</param>
    /// <param name="procName">存储过程所需参数</param>
    public void ExcuteProc(string procName, SqlParameter[] prams, out SqlDataReader reader)
    {
        command = CreateCommand(procName, prams);
        reader = command.ExecuteReader(CommandBehavior.CloseConnection);
    }

    /// <summary>
    /// 创建一个SqlCommand对象以此来执行存储过程
    /// </summary>
    /// <param name="procName">存储过程名称</param>
    /// <param name="prams">存储过程所需参数</param>
    /// <return>返回SqlCommand对象</return>
    private SqlCommand CreateCommand(string procName, SqlParameter[] prams)
    {
        connection();
        command = new SqlCommand(procName, conn);
        command.CommandType = CommandType.StoredProcedure;
        //-------------依次将参数传入存储过程
        if (prams != null)
        {
            foreach (SqlParameter parameter in prams)
            {
                command.Parameters.Add(parameter);
            }
        }
        //--------------------------------------
        command.Parameters.Add(
            new SqlParameter("ReturnValue", SqlDbType.Int, 4, ParameterDirection.ReturnValue, false, 0, 0, string.Empty, DataRowVersion.Default, null));
        return command;
    }

    /// <summary>
    /// 生成存储过程参数
    /// </summary>
    /// <param name="ParamName">存储过程名称</param>
    /// <param name="DbType">参数类型</param>
    /// <param name="Size">参数大小</param>
    /// <param name="Direction">参数方向</param>
    /// <param name="Value">参数值</param>
    /// <return>新的 parameter 对象</return>
    public SqlParameter CreateParam(string ParamName, SqlDbType DbType, Int32 Size, ParameterDirection Direction, object Value)
    {
        SqlParameter param;
        if (Size > 0)                           //根据参数Size大小值判断是否使用Size参数，大于0时使用，否则不使用
        {
            param = new SqlParameter(ParamName, DbType, Size);
        }
        else
        {
            param = new SqlParameter(ParamName, DbType);
        }
        param.Direction = Direction;            //创建输出类型的参数
        if (!(Direction == ParameterDirection.Output && Value == null))
        {
            param.Value = Value;
        }
        return param;
    }

    /// <summary>
    /// 传入输入参数
    /// </summary>
    /// <param name="ParamName">存储过程名称</param>
    /// <param name="DbType">参数类型</param>
    /// <param name="Size">参数大小</param>
    /// <param name="Value">参数值</param>
    /// <return>新的 parameter 对象</return>
    public SqlParameter CreateInParam(string ParamName, SqlDbType DbType, int Size, object Value)
    {
        return CreateParam(ParamName, DbType, Size, ParameterDirection.Input, Value);
    }

    /// <summary>
    /// 传入返回值参数
    /// </summary>
    /// <param name="ParamName">存储过程名称</param>
    /// <param name="DbType">参数类型</param>
    /// <param name="Size">参数大小</param>
    /// <return>新的 parameter 对象</return>
    public SqlParameter CreateOutParam(string ParamName, SqlDbType DbType, int Size)
    {
        return CreateParam(ParamName, DbType, Size, ParameterDirection.Output, null);
    }

    /// <summary>
    /// 传入返回值参数
    /// </summary>
    /// <param name="ParamName">存储过程名称</param>
    /// <param name="DbType">参数类型</param>
    /// <param name="Size">参数大小</param>
    /// <return>新的 parameter 对象</return>
    public SqlParameter CreateReturnParam(string ParamName, SqlDbType DbType, int Size)
    {
        return CreateParam(ParamName, DbType, Size, ParameterDirection.ReturnValue, null);
    }
}