错误：System.Data.OleDb.OleDbException (0x80040E14)：查询表达式中的语法错误（缺少运算符）

Question

我试图将存储过程的结果导出到 Excel 并在运行时收到以下错误： System.Data.OleDb.OleDbException (0x80040E14): 查询表达式中的语法错误（缺少运算符）。 下面是我正在使用的代码。 excel 文件已创建，但没有数据填充该文件。

string TableColumns = "";

// Get the Column List from Data Table so can create Excel Sheet with Header
foreach (DataTable table in ds.Tables)
{
    foreach (DataColumn column in table.Columns)
    {
        TableColumns += column + "],[";
    }
}

// Replace most right comma from Columnlist
TableColumns = ("[" + TableColumns.Replace(",", " Text,").TrimEnd(','));
TableColumns = TableColumns.Remove(TableColumns.Length - 2);

//Use OLE DB Connection and Create Excel Sheet
Excel_OLE_Con.ConnectionString = connstring;
Excel_OLE_Con.Open();
Excel_OLE_Cmd.Connection = Excel_OLE_Con;
Excel_OLE_Cmd.CommandText = "Create table " + SheetName + " (" + TableColumns + ")";
Excel_OLE_Cmd.ExecuteNonQuery();

//Write Data to Excel Sheet from DataTable dynamically
foreach (DataTable table in ds.Tables)
{
    String sqlCommandInsert = "";
    String sqlCommandValue = "";
    foreach (DataColumn dataColumn in table.Columns)
    {
        sqlCommandValue += dataColumn + "],[";
    }

    sqlCommandValue = "[" + sqlCommandValue.TrimEnd(',');
    sqlCommandValue = sqlCommandValue.Remove(sqlCommandValue.Length - 2);
    sqlCommandInsert = "INSERT into " + SheetName + "(" + sqlCommandValue + ") VALUES(";

    int columnCount = table.Columns.Count;
    foreach (DataRow row in table.Rows)
    {
        string columnvalues = "";
        for (int i = 0; i < columnCount; i++)
        {
            int index = table.Rows.IndexOf(row);
            columnvalues += "'" + table.Rows[index].ItemArray[i] + "',";
        }
        columnvalues = columnvalues.TrimEnd(',');
        var command = sqlCommandInsert + columnvalues + ")";
        Excel_OLE_Cmd.CommandText = command;
        Excel_OLE_Cmd.ExecuteNonQuery();
    }
}
Excel_OLE_Con.Close();
Dts.TaskResult = (int)ScriptResults.Success;

Answer 1

所以这个问题与你的数据中有一个未转义的单引号有关。 处理该问题的两个选项是转义单引号（将其转换为两个单引号）：

string myData = "This string won't work";
string myDataEscaped = myData.Replace("'", "''");

或者另一个选项（更健壮）是使用参数化查询。 我将仅使用代码的下半部分，您将在其中执行此查询构建和插入，并向您展示如何完成（以及一些清理和使用StringBuilder ）。 注意我没有编译和测试这个，因为我没有任何测试数据可以使用。

var tableColumns = string.Join(",", columns.Cast<DataColumn>().Select(x => "[" + x.ColumnName + "]"));
var insertBase = $"INSERT into {SheetName} ({tableColumns}) VALUES(";
int columnCount = table.Columns.Count;
foreach (DataRow row in table.Rows)
{
    Excel_OLE_Cmd.Parameters.Clear(); // Since you are reusing the command you have to clear the parameters

    var command = new StringBuilder(insertBase);
    var index = table.Rows.IndexOf(row);

    // I will assume you always have at least one column, otherwise these lines would fail
    // Add the first row before the loop that way we don't have to delete the end comma
    var param = $"@param_{index}_0";
    command.Append(param);
    Excel_OLE_Cmd.Parameters.AddWithValue(param, table.Rows[index].ItemArray[0]);
    for (int i = 1; i < columnCount; ++i)
    {
        param = $"@param_{index}_{i}"
        command.Append("," + param);
        Excel_OLE_Cmd.Parameters.AddWithValue(param, table.Rows[index].ItemArray[i]);
    }
    command.Append(")");
    Excel_OLE_Cmd.CommandText = command.ToString();
    Excel_OLE_Cmd.ExecuteNonQuery();
}