Php 根据下拉选择调整查询

我想得到的是：

我的php文件中有以下变量：

$tech= $_GET['Combobox10'];
$shopfloor = $_GET['Combobox8'];

我想做的是，如果从HTML表单中，例如变量$tech（它是一个下拉列表）被选择为“all”，那么下面的查询必须运行，以显示表中的所有tech，就像sql查询中与tech相关的Having部分不存在一样。$shopfool也是如此-如果选择的下拉列表是'all'，我希望查询忽略$shopfool的having部分并显示all。当然，如果选择了特定的车间或技术，则必须强制执行查询的Having部分

$result = mysql_query ("SELECT * FROM dbo_shopfloorcells INNER JOIN (dbo_noted_by INNER JOIN (dbo_leader_name INNER JOIN (dbo_Station INNER JOIN (dbo_Shop_Floor INNER JOIN (dbo_Fault_Desc INNER JOIN 
(dbo_Machine INNER JOIN (dbo_Line_Cell_Binding INNER JOIN (dbo_Tech_Name INNER JOIN (dbo_Maint_Category INNER JOIN dbo_newprevlog2 ON dbo_Maint_Category.ID = dbo_newprevlog2.ID_Maint_Cat) 
ON dbo_Tech_Name.ID = dbo_newprevlog2.ID_Tech_Name) ON dbo_Line_Cell_Binding.PKID = dbo_newprevlog2.ID_Line_Desc) ON dbo_Machine.PKID = dbo_newprevlog2.ID_Mach_Desc) 
ON dbo_Fault_Desc.ID = dbo_newprevlog2.ID_Fault_Desc) ON dbo_Shop_Floor.ID = dbo_newprevlog2.ID_Shop_Floor) ON dbo_Station.PKID = dbo_newprevlog2.ID_Station_No) 
ON dbo_leader_name.ID = dbo_newprevlog2.ID_Leader_Name) ON dbo_noted_by.ID = dbo_newprevlog2.ID_Noted_By) ON (dbo_shopfloorcells.PKID = dbo_Line_Cell_Binding.ID_Cell_Shop_Floor) 
AND (dbo_shopfloorcells.ID_Shop_Floor = dbo_Shop_Floor.ID)
GROUP BY dbo_newprevlog2.ID, dbo_newprevlog2.Status, dbo_Shop_Floor.Shopfloor, dbo_shopfloorcells.Cell, dbo_Line_Cell_Binding.Line_Name, 
dbo_Machine.Machine_Section, dbo_Station.Station_, dbo_Tech_Name.Technician_Name, dbo_Maint_Category.Maintenance_Category, dbo_Fault_Desc.Fault_Description, 
dbo_newprevlog2.Intervention, dbo_newprevlog2.Remarks, dbo_newprevlog2.ComponentsParts, dbo_newprevlog2.StartDate1, dbo_newprevlog2.EndDate1, dbo_newprevlog2.StartTime1, 
dbo_newprevlog2.EndTime1, dbo_newprevlog2.DurationTime, dbo_newprevlog2.ID_Shop_Floor, dbo_Line_Cell_Binding.ID_Cell_Shop_Floor
having (dbo_newprevlog2.ID_Shop_Floor = $shopfloor) AND ((dbo_newprevlog2.ID_Tech_Name = $tech));");

我不知道该怎么办。例如，我尝试过将$tech改成这样（感谢这个论坛的用户@Déjávu）：

但这并没有给我这个场合所需的结果。

方法1 试试下面的方法

$tech = ($_GET['Combobox10'] != "all") ? $_GET['Combobox10'] : "dbo_newprevlog2.ID_Tech_Name";

$shopfloor = ($_GET['Combobox8'] != "all") ? $_GET['Combobox8'] : "dbo_newprevlog2.ID_Shop_Floor";

或

我们的想法是跳过

mysql\u查询

最后一行的检查（

having

），并使其始终为真

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方法2（推荐） 虽然更好的解决方案是完全改变您的

mysql\u查询

，跳过这些检查

更改sql查询（在注释后进行修改以满足您的需要）

请注意，$check部分实际上决定应用哪些SQL查询参数，这取决于是否选择了组合框中的一个或两个“全部”

这一点不需要改变

$tech= $_GET['Combobox10'];
$shopfloor = $_GET['Combobox8'];

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上次赋值后，$tech的值是多少？是的，我可以按照您上次的解决方案（更改SQL查询）进行操作，但是我如何才能让它与同一查询中的其他变量一起工作？因此，我也需要绕过，就像在拥有。。。。还有…？@elstiv再次看一看，我已经根据您的评论更新了代码，并添加了代码上方的工作方式。告诉我它是否适合你的需要。

$tech = ($_GET['Combobox10'] != "all") ? $_GET['Combobox10'] : true;

$shopfloor = ($_GET['Combobox8'] != "all") ? $_GET['Combobox8'] : true;

$check = "";
    if ($tech != "all" or $shopfloor != "all") $check .= "having ";
    if ($tech != "all") $check .= "(dbo_newprevlog2.ID_Tech_Name = ".$tech.")";
    if ($tech != "all" and $shopfloor != "all") $check .= " AND ";
    if ($shopfloor != "all") $check .= "(dbo_newprevlog2.ID_Shop_Floor = ".$shopfloor.")";
    
    $result = mysql_query ("SELECT * FROM dbo_shopfloorcells INNER JOIN (dbo_noted_by INNER JOIN (dbo_leader_name INNER JOIN (dbo_Station INNER JOIN (dbo_Shop_Floor INNER JOIN (dbo_Fault_Desc INNER JOIN 
    (dbo_Machine INNER JOIN (dbo_Line_Cell_Binding INNER JOIN (dbo_Tech_Name INNER JOIN (dbo_Maint_Category INNER JOIN dbo_newprevlog2 ON dbo_Maint_Category.ID = dbo_newprevlog2.ID_Maint_Cat) 
    ON dbo_Tech_Name.ID = dbo_newprevlog2.ID_Tech_Name) ON dbo_Line_Cell_Binding.PKID = dbo_newprevlog2.ID_Line_Desc) ON dbo_Machine.PKID = dbo_newprevlog2.ID_Mach_Desc) 
    ON dbo_Fault_Desc.ID = dbo_newprevlog2.ID_Fault_Desc) ON dbo_Shop_Floor.ID = dbo_newprevlog2.ID_Shop_Floor) ON dbo_Station.PKID = dbo_newprevlog2.ID_Station_No) 
    ON dbo_leader_name.ID = dbo_newprevlog2.ID_Leader_Name) ON dbo_noted_by.ID = dbo_newprevlog2.ID_Noted_By) ON (dbo_shopfloorcells.PKID = dbo_Line_Cell_Binding.ID_Cell_Shop_Floor) 
    AND (dbo_shopfloorcells.ID_Shop_Floor = dbo_Shop_Floor.ID)
    GROUP BY dbo_newprevlog2.ID, dbo_newprevlog2.Status, dbo_Shop_Floor.Shopfloor, dbo_shopfloorcells.Cell, dbo_Line_Cell_Binding.Line_Name, 
    dbo_Machine.Machine_Section, dbo_Station.Station_, dbo_Tech_Name.Technician_Name, dbo_Maint_Category.Maintenance_Category, dbo_Fault_Desc.Fault_Description, 
    dbo_newprevlog2.Intervention, dbo_newprevlog2.Remarks, dbo_newprevlog2.ComponentsParts, dbo_newprevlog2.StartDate1, dbo_newprevlog2.EndDate1, dbo_newprevlog2.StartTime1, 
    dbo_newprevlog2.EndTime1, dbo_newprevlog2.DurationTime, dbo_newprevlog2.ID_Shop_Floor, dbo_Line_Cell_Binding.ID_Cell_Shop_Floor".$check.";");

$tech= $_GET['Combobox10'];
$shopfloor = $_GET['Combobox8'];