使用 SQLCommand.EndExecuteNonQuery 时出现 SQL 语法错误

Question

我正在尝试在后台工作程序中异步运行两个 SQL 语句（MSSQL 2005）。但是，当我在第一个 SqlCommand 上调用 EndExecuteNonQuery 方法时，我收到“SQL 语法错误附近”错误。

这是我的代码：

try
{
    SqlCommand sqlCmd = uow.DataLayer.CreateCommand() as SqlCommand;
    sqlCmd.CommandText = "DELETE FROM dbo.EligibilityRecordKeyValue WHERE EligibilityRecord IN " +
    "(SELECT EligibilityRecord FROM dbo.EligibilityRecord WHERE Organization = '" + map.Organization.Oid + "')";
    IAsyncResult result = sqlCmd.BeginExecuteNonQuery();
    while (!result.IsCompleted)
    {
        worker.ReportProgress(0, "Deleting existing record keys");
        System.Threading.Thread.Sleep(200);
    }
    count = sqlCmd.EndExecuteNonQuery(result);
}
catch (SqlException ex)
{
}
catch (InvalidOperationException ex)
{
}
finally
{
    worker.ReportProgress(2, String.Format("Existing {0} records keys deleted.", count));
}

try
{
    SqlCommand sqlCmd = uow.DataLayer.CreateCommand() as SqlCommand;
    sqlCmd.CommandText = "DELETE FROM dbo.EligibilityRecord WHERE Organization = '" +      map.Organization.Oid + "'";
    IAsyncResult result = sqlCmd.BeginExecuteNonQuery();
    while (!result.IsCompleted)
    {
        worker.ReportProgress(0, "Deleting existing records");
        System.Threading.Thread.Sleep(200);
    }
    count = sqlCmd.EndExecuteNonQuery(result);
}
catch (SqlException ex)
{
}
catch (InvalidOperationException ex)
{
}
finally
{
    worker.ReportProgress(5, String.Format("Existing {0} records deleted.", count));
}

它在第一个 count = sqlCmd.EndExecuteNonQuery(result); 上失败

Answer 1

好吧，在两个 SQL 命令中添加 WAITFOR DELAY 似乎已经解决了这个问题。

sqlCmd.CommandText = String.Format("WAITFOR DELAY '00:00:05'; DELETE FROM dbo.EligibilityRecordKeyValue WHERE EligibilityRecord IN " + 
                    "(SELECT EligibilityRecord FROM dbo.EligibilityRecord WHERE Organization = '{0}')", map.Organization.Oid);

sqlCmd.CommandText = String.Format("WAITFOR DELAY '00:00:05'; DELETE FROM dbo.EligibilityRecord WHERE Organization = '{0}'", map.Organization.Oid);

有谁知道为什么会发生这种情况？