查询函数

#region 查询函数
    // 返回DataSet
    public override DataSet ExcuteDataSet(string cmdText)
    {  
        DataSet dataSet = new DataSet();
        SqlDataAdapter sqlDataAdapter = new SqlDataAdapter(cmdText, _sqlConnection);
        sqlDataAdapter.Fill(dataSet);
        return dataSet;
    }
    public override DataSet ExcuteDataSet(DbCommand sqlCommand)
    {
        DataSet dataSet = new DataSet();
        SqlDataAdapter sqlDataAdapter = new SqlDataAdapter(((SqlCommand)sqlCommand));               
        sqlDataAdapter.Fill(dataSet);
        return dataSet;
    }

    // 返回带有空数据行的DataSet
    public override DataSet GetEmptyRowStyleDataSet(string cmdText)
    {
        cmdText += "where 1=2";
        DataSet dataSet = new DataSet();
        SqlDataAdapter sqlDataAdapter = new SqlDataAdapter(cmdText, _sqlConnection);
        sqlDataAdapter.Fill(dataSet);
        DataTable dt = new DataTable();
        dt = dataSet.Tables[0];

        DataRow dataRow = dt.NewRow();
        foreach (DataColumn dataColumn in dt.Columns)
        {
            dataRow[dataColumn] = DBNull.Value;
        }
        dt.Rows.Add(dataRow);

        return dataSet;
    }

    // 传入参数组
    public override DataSet ExcuteDataSetWithParaArray(string parmArray)
    {
        string cmdText = "select * from City where RegionID in  (" + parmArray + ")";
        DataSet dataSet = new DataSet();
        SqlDataAdapter sqlDataAdapter = new SqlDataAdapter(cmdText, _sqlConnection);
        sqlDataAdapter.Fill(dataSet);
        return dataSet;
    }

    // 传入参数组防止注入改良版
    public override DataSet ExcuteDataSetWithParaList(string parmArray)
    {
        string[] array = parmArray.Split(',');

        int paraCount = array.Length;

        StringBuilder cmdText = new StringBuilder("select * from City where RegionID in ()");

        SqlParameter[] sps = new SqlParameter[array.Length];

        for (int i = 0; i < paraCount; i++)
        {  
            string para = "@regionID"+i;
            if (i == 0)
            {
                cmdText.Insert(cmdText.Length - 1, para);
            }
            else
            {
                cmdText.Insert(cmdText.Length - 1, ("," + para));
            }
            sps[i] = new SqlParameter(para, array[i]);
        }

        SqlCommand sqlCommand = new SqlCommand();

        sqlCommand.Parameters.AddRange(sps);

        sqlCommand.Connection = _sqlConnection;
        sqlCommand.CommandText = cmdText.ToString();

        DataSet dataSet = new DataSet();
        SqlDataAdapter sqlDataAdapter = new SqlDataAdapter();
        sqlDataAdapter.SelectCommand = sqlCommand;
        sqlDataAdapter.Fill(dataSet);
        return dataSet;

    }

    // 返回影响行数
    public override int ExcuteNonQuery(string cmdText)
    {
        SqlCommand sqlCommand = new SqlCommand(cmdText, _sqlConnection);
        return ExcuteNonQuery(sqlCommand);
    }
    public override int ExcuteNonQuery(DbCommand sqlCommand)
    {
        return ((SqlCommand)sqlCommand).ExecuteNonQuery();
    }

    // 返回SqlDataReader
    public override DbDataReader ExcuteDataReader(string cmdText)
    {
        SqlCommand sqlCommand = new SqlCommand(cmdText, _sqlConnection);
        return ExcuteDataReader(sqlCommand);
    }
    public override DbDataReader ExcuteDataReader(DbCommand sqlCommand)
    {
        return ((SqlCommand)sqlCommand).ExecuteReader();
    }

    // 关闭DataReader
    public override void CloseDataReader(DbDataReader dbDataReader)
    {
        if (dbDataReader == null || dbDataReader.IsClosed == true)
            return;
        dbDataReader.Close();
    }

    // 返回Scalar(第一行第一列)
    public override object ExcuteDataScaler(string cmdText)
    {
        SqlCommand sqlCommand = new SqlCommand(cmdText, _sqlConnection);
        return ExcuteDataScaler(sqlCommand);
    }
    public override object ExcuteDataScaler(DbCommand sqlCommand)
    {
        return ((SqlCommand)sqlCommand).ExecuteScalar();
    }
    #endregion