查询从2个表中选择多个值

Question

Table names:

1. tbla_can_types

Fields are fac_id,type_id,type_name,status

1. tbla_canteen_rates (there is no data in this table)

Fields are `fac_id,cat_id,type_id,from time,to_time,rate,off_rate,status,effective_date.,can_id(sequence number)

<?php
include('adodb/adodb.inc.php');
$conn=&ADONewconnection('oci8');
$conn->Pconnect('conn','hostname','username','pwd');
$fac_id=$_GET['fac_id'];
$cat_id=$_GET['cat_id'];
$file=fopen("text.txt","w+");
global $newId;
header("Content-type: text/xml");
echo('<?xml version="1.0" encoding="iso-8859-1"?>');
echo "<data>";
$ids = explode(",",$_POST["ids"]);

$rates="select type_id,from_time,to_time,rate,off_rate,status,to_char(effective_date,'dd-Mon-yyyy') e_date,can_id from tbla_canteen_rates where fac_id=$fac_id and cat_id=$cat_id order by to_number(substr(from_time,0,length(from_time)-3))";
    $rs1=$conn->Execute($rates);
    if(!$rs1->EOF)
    echo $rs1->fields[0].'~'.$rs1->fields[1].'~'.$rs1->fields[2].'~'.$rs1->fields[3].'~'.$rs1->fields[4].'~'.$rs1->fields[5].'~'.$rs1->fields[6].'~'.$rs1->fields[7];
    $temp_id=$rs1->fields[0];
    echo $temp_id;
    $rs1->MoveNext();

    for ($i=0; $i < sizeof($ids); $i++)
    { 
        $rowId = $ids[$i]; //id or row which was updated 
        $newId = $rowId; //will be used for insert operation    
        $mode = $_POST[$rowId."_!nativeeditor_status"]; //get request mode
        switch($mode)
        {
        case "inserted":
          $insert= "insert into tbla_canteen_rates(type_id,from_time,to_time,rate,off_rate,status,effective_date,fac_id,cat_id )values
            ($temp_id,
             '".$_POST[$rowId."_c1"]."',
             '".$_POST[$rowId."_c2"]."',
             '".$_POST[$rowId."_c3"]."',
             '".$_POST[$rowId."_c4"]."',
             '".$_POST[$rowId."_c5"]."',to_date('".$_POST[$rowId."_c6"]."','dd-Mon-yyyy'),$fac_id,$cat_id)";
          $conn->Execute($insert);
          fwrite($file,$insert);
          $action='add_row($rowId)';
        break;
        case "deleted":
            $delete = "delete from tbla_canteen_rates where can_id=".$rowId ;
            $conn->Execute($delete);
            fwrite($file,$delete);
            $action ='delete_row($rowId)';
        break;
        default:
            $update ="update tbla_canteen_rates set 
                    type_id=$temp_id,
                    from_time='".$_POST[$rowId."_c1"]."',
                    to_time='".$_POST[$rowId."_c2"]."',
                    rate='".$_POST[$rowId."_c3"]."',
                    off_rate='".$_POST[$rowId."_c4"]."',
                    status='".$_POST[$rowId."_c5"]."',
                    effective_date=to_date('".$_POST[$rowId."_c6"]."','dd-Mon-yyyy'),
                    fac_id='$fac_id',cat_id='$cat_id'
                    where  can_id=".$rowId;
            $conn->Execute($update);
            fwrite($file,$update);
            $action = 'update_row($rowId)';
        break;
        }   
        echo "<action type='".$action."' sid='".$rowId."' tid='".$newId."'/>";
    }
    echo "</data>";
    ?>  

In the query i need id for type_id in a variable i have written but every time it is getting id of first element only.

in this i need an id for type_id.

please send me the code 4 that

Regards

Pawan

Answer 1

I've got a sneaking suspicion that you've got several questions in there, but since you asked about the sql query, this should work:

Note: I'm assuming fac_id is the id that binds the two tables together. "var_fac_id" and "var_cat_id" are the values from your comboboxes.

Select t1.type_name, t2.from_time, t2.to_time, t2.rate
FROM tbla_can_types as t1 LEFT JOIN tbla_canteen_rates as t2
ON t1.fac_id = t2.fac_id
WHERE t1.fac_id = var_fac_id AND t2.cat_id = var_cat_id

Further notes: I think this should work despite the "AND t2.cat_id = var_cat_id" (which obviously would find not results in an empty table), since it's a left join. If it returns an empty set, however, see if it works if you remove it.

Update:
your comment above makes me think the tables are bound together by type_id instead. If that's the case, use ON t1.type_id = t2.type_id instead of ON t1.fac_id = t2.fac_id

Update #2 based on poster's comments
I'm not going to do your homework, dude. And homework is the only place where they'd tell you to not do joins. I will send you to some resources that will help you learn this stuff, though. Check out the basic mysql example from php.net: http://www.php.net/manual/en/mysql.examples-basic.php . That sample actually gets you pretty close to what you need. Also their overall mysql documentation, which is good for looking up what specific functions do: http://www.php.net/manual/en/book.mysql.php . Finally, remember that you're learning two languages here -- PHP, along with its functions to access a mysql DB, and -- SQL, which is a query language used within DBs. For SQL, check out http://sqlzoo.net/ , which seems a decent introduction on how to write queries.

Good luck on your assignment.