OLEDB 在尝试获取数据时出错

Question

当我尝试使用 OLEDB.I select 来自 excel 的所有数据时，出现

错误

查询表达式中存在语法错误（缺少运算符）'Created By' 这是因为列名称中的 space 吗？

查询是：

SELECT Code,Name,Created By,Date FROM [Template$]

public DataTable GetExcelDataToTable(string filename, string dataExchangeSelectedColum)
{
    //List<DataExchangeDefinition> dataExchange = new List<DataExchangeDefinition>();
    string extension = Path.GetExtension(filename);
    string connstring = string.Empty;
    DataTable ExcelData = null;
    try
    {
        switch (extension)
        {
            case ".xls":
                connstring = string.Format(ConfigurationManager.ConnectionStrings["Excel03ConString"].ConnectionString, filename);
                break;
            case ".xlsx":
                connstring = string.Format(ConfigurationManager.ConnectionStrings["Excel07+ConString"].ConnectionString, filename);
                break;
        }
        using (OleDbConnection connExcel = new OleDbConnection(connstring))
        {
            using (OleDbCommand cmd = new OleDbCommand())
            {
                cmd.Connection = connExcel;
                connExcel.Open();
                var dtExcelSchema = connExcel.GetOleDbSchemaTable(OleDbSchemaGuid.Tables, null);
                connExcel.Close();
                var firstSheet = dtExcelSchema.Rows[0]["TABLE_NAME"].ToString();
                cmd.CommandText = "SELECT " + dataExchangeSelectedColum + " FROM [" + firstSheet + "]";
                ExcelData = new DataTable();
                OleDbDataAdapter oda = new OleDbDataAdapter();
                oda.SelectCommand = cmd;
                oda.Fill(ExcelData);
            }
        }
    }
    catch (Exception ex)
    {
        throw ex;
    }

    return ExcelData;
}

这是我试过的代码，这里 dataExchangeSelectedColum 包含它们所在的列 "Code, Name, Created By, Date"

Answer 1

如果列名包含空格，您需要在其两边添加方括号：

cmd.CommandText = $"SELECT [{dataExchangeSelectedColum}] FROM [{firstSheet}]";

在您发表评论后进行编辑：

如果你想select几个名称可能包含空格的列：

public DataTable GetExcelDataToTable(string filename, IEnumerable<string> columns)
{
    ...
    string formattedColumns = string.Join("," columns.Select(column => $"[{column}]"));

    cmd.CommandText = $"SELECT {formattedColumns} FROM [{firstSheet}]";
    ...
}

可以通过以下方式调用：

DataTable table = GetExcelDataToTable(fileName, 
    new string[] { "Code", "Name", "Created By", "Date" });

Answer 2

我这样做过

 List<string> selecttedColsList = dataExchangeSelectedColum.Split(',').ToList();
        string formattedColumns = "";
        //string comma = "";
        for (int i = 0; i < selecttedColsList.Count; i++)
        {
            //formattedColumns = string.Join(",", selecttedColsList.Select(col => $"[" + selecttedColsList[i] + "]"));
            formattedColumns+= ""+$"[" + selecttedColsList[i] + "]";
            if (i != selecttedColsList.Count - 1)
            {
                formattedColumns += ",";
            }

        }

OLEDB 在尝试获取数据时出错

OLEDB gives an error while trying to fetch data

c#

oledb