Question

我希望从联系人，contact_message和contact_reply数据中删除数据

联系表（1数据）
-id
-code
-ip
-date
列表

Array
(
    [0] => Array
        (
            [id] => 5
            [messageid] => 1
            [message] => A new e-mail 
            [date] => 2017-01-18
        )

)

contact_message表（1个数据）
-id
-messageid
-message
-date

列出contact_message数据

     DELETE i,im FROM contact AS i
 INNER JOIN contact_message AS im WHERE i.id=im.id  and i.id=1

sql query

    Çözümleme sırasında 3 hata bulundu.

    Beklenmedik belirteç. (near "i" at position 7)
    Beklenmedik belirteç. (near "," at position 9)
    Beklenmedik belirteç. (near "im" at position 11)
    SQL sorgusu:

   DELETE i,im FROM contact AS i
     INNER JOIN contact_message AS im WHERE i.id=im.id  and i.id=1


    MySQL çıktısı: Belgeler

    #1054 - Unknown column 'i.id' in 'where clause'

结果（错误）

public static void FilterPivotItems(PivotField pf, List<string> pivotItemNames)
{
    PivotItems pis = pf.ChildItems;

    // Orientation != XlPivotFieldOrientation.xlHidden and we need to filter by at least one value (as Excel implies)
    if (pf.Orientation != 0 && pivotItemNames.Count > 0)
    {
        int oldAutoSortOrder = 0;

        if (pf.AutoSortOrder != (int)Constants.xlManual)
        {
            oldAutoSortOrder = pf.AutoSortOrder;
            pf.AutoSort((int)Constants.xlManual, pf.Name);
        }

        int pivotItemsCount = pf.PivotItems().Count;
        List<int> pivotItemsToHide = new List<int>();

        for (int i = 1; i <= pivotItemsCount; i++)
        {
            PivotItem pi = pf.PivotItems(i);

            // check if current pivot item needs to be hidden (if it exists in pivotItemNames)
            var match = pivotItemNames.FirstOrDefault(stringToCheck => stringToCheck.Equals(pi.Value));

            if (match == null)
            {
                // hide these pivot items later because we can hit exception "Unable to set the Visible property of the PivotItem class"
                // (this happens because all pivot items get hidden and we need to have at least one visible)
                pivotItemsToHide.Add(i);
            }
            else
            {
                TryFilterPivotItems(pi, true, true);
            }
        }

        for (int i = 0; i < pivotItemsToHide.Count; i++)
        {
            PivotItem pi = pf.PivotItems(pivotItemsToHide[i]);
            TryFilterPivotItems(pi, false, true);
        }

        if (oldAutoSortOrder != 0)
        {
            pf.AutoSort(oldAutoSortOrder, pf.Name);
        }

        PivotTable pt = pf.Parent as PivotTable;
        if (pt != null)
        {
            pt.Update();
        }
    }
}

public static void TryFilterPivotItems(PivotItem currentPI, bool filterValue, bool deferLayoutUpdate = false)
{
    try
    {
        PivotField pf = currentPI.Parent;
        PivotTable pt = pf.Parent as PivotTable;

        if (currentPI.Visible != filterValue)
        {
            if (deferLayoutUpdate == true && pt != null)
            {
                // just keep these three lines stick together, no if, no nothing (otherwise ManualUpdate will reset back to false)
                pt.ManualUpdate = true;
                currentPI.Visible = filterValue;

                // this may be redundant since setting Visible property of pivot item, resets ManualUpdate to false
                pt.ManualUpdate = false;
            }
            else
            {
                currentPI.Visible = filterValue;
            }
        }
    }
    catch (Exception ex)
    {

    }
}

public static void TryFilterPivotItems(PivotField pf, string itemValue, bool filterValue, bool deferLayoutUpdate = false)
{
    try
    {
        PivotItem currentPI = pf.PivotItems(itemValue);
        TryFilterPivotItems(currentPI, filterValue, deferLayoutUpdate);
    }
    catch (Exception ex)
    {

    }
}

你的解决方案是什么？

Answer 1

我不确定为什么它不起作用，但你应该（尽管它是可选的）利用ON而不是WHERE - 它会减少行搜索，并且运行得更快更安全。 / p>

DELETE i, im FROM contact i
JOIN contact_message im ON i.id = im.id 
WHERE i.id = 1

Mysql删除内连接不起作用？

1 个答案: