All i'm trying to do is count how many bookings have requested wheelchair access not sure with the best way....
using (var context = new TalyllynContext())
{
var count = context.Bookings.SqlQuery(" SELECT * FROM dbo.Booking Where Wheelchair_Access = 'true' ").Count();
}
ViewBag.Count = count;
This is what i want to happen in the SQL, but not sure how to make the view bag Count display the variable or is there a much better solution
In the view it can be anything as long as it shows the count value !!
using (var context = new TalyllynContext())
{
ViewBag.Count = context.Bookings.SqlQuery(" SELECT * FROM dbo.Booking Where Wheelchair_Access = 'true' ").Count();
}
return View()
If you are using razor do something like this.
<p>#ViewBag.Count</p>
That will display the value in the view if you use the code you showed.
Did you tried moving the count variable before the using statement, so that it is accessible outside the using as well.
Yes moving the view back worked thank you life save i also changed it like this as an example
ViewBag.Count = db.Bookings.SqlQuery(" SELECT * FROM dbo.Booking Where Gift_Aid = 'true' ").Count();
Related
I just recently learned how to work with PDO database queries, but my latest query isn't working for some reason. All my other queries include arrays and while loops, but I don't think this one requires either, so I may just need to change the query structure somehow.
$stm = $pdo->prepare("SELECT H.N, H.URL, H.Title, H.Subtitle,
H.Site, H.MetaTitle, H.MetaDesc, H.KW, H.Live, A.Article, A.Pagedex
FROM 1_home_pages H
LEFT JOIN 1_home_articles A ON A.Site = H.Site
WHERE H.URL = :MySection AND H.Site = :MySiteId AND H.Live = 1 AND A.Site = :MySiteId AND A.Section = :MySection");
// $stm->execute();
$stm->execute(array(
'MySiteId'=>$MySiteID,
'MySection'=>$MySection
));
$data = $stm->fetchAll();
I added the line $data = $stm->fetchAll();, and it now works - as an array. The foreach statement below displays EVERYTHING in one jumbled mess...
foreach($data as $row) {
print_r($row);
}
To escape the array and just display one item at a time, I tried the following:
$Content = $data['Article'];
echo $Content;
But it doesn't display anything. Can anyone tell me the solution?
I don't know if you made a typo while posting this question, or this is a typo from your source code: you have :MySection and yet while executing you write MySection (without colon). What's more, this line:
WHERE H.URL = :MySection
AND H.Site = :MySiteId
AND H.Live = 1
AND A.Site = :MySiteId
AND A.Section = :MySection");
You used multiple parameters with same name in one statement. Don't know if this is a correct way to do it, since I've never done it. I suggest you try using different names for parameters and see if that helps. Also, what do you mean 'but my latest query isn't working for some reason.' ? What does it return? Does it return anything at all? fetchAll returns multiple rows, that's why you get array.
Instead of $data = $stm->fetchAll(); use $data = $stm->fetch();. It will return next row from your query.
I am stuck with a problem here. I am trying to compare items in a list to another list with much more items using linq.
For example:
list 1: 10,15,20
list 2: 10,13,14,15,20,30,45,54,67,87
I should get TRUE if all the items in list 1 occur in list 2. So the example above should return TRUE
Like you can see I can't use sequenceEquals
Any ideas?
EDIT:
list2 is actually not a list it is a column in sql thas has following values:
<id>673</id><id>698</id><id>735</id><id>1118</id><id>1120</id><id>25353</id>.
in linq I did the following queries thanks to Jon Skeets help:
var query = from e in db
where e.taxonomy_parent_id == 722
select e.taxonomy_item_id;
query is IQueryable of longs at this moment
var query2 = from e in db
where query.Contains(e.taxonomy_item_id)
where !lsTaxIDstring.Except(e.taxonomy_ids.Replace("<id>", "")
.Replace("</id>", "")
.Split(',').ToList())
.Any()
select e.taxonomy_item_id;
But now I am getting the error Local sequence cannot be used in LINQ to SQL implementation of query operators except the Contains() operator.
How about:
if (!list1.Except(list2).Any())
That's about the simplest approach I can think of. You could explicitly create sets etc if you want:
HashSet<int> set2 = new HashSet<int>(list2);
if (!list1.Any(x => set2.Contains(x)))
but I'd expect that to pretty much be the implementation of Except anyway.
This should be what you want:
!list1.Except(list2).Any()
var result = list1.All(i => list2.Any(i2 => i2 == i));
Customer.text is a field in an T-SQL DB (that I do not control and thus may not alter) of type "text".
I'd like to do something like this:
List<string> compare = new List<string>();
compare.Add("one");
compare.Add("two");
var q = from t in customer
where t.text.Contains( compare.First())
select t;
this will work.
But now I'd like to do something like: (!NOT WORKING!)
var q = from t in customer
where compare.Contains( t.text )
select t;
How can I achieve this? Is it even possible?
EDIT: The problem is obviously not exactly clear: A text column in SQL cannot be queried using "=" but only with LIKE. Thus the compare.Contains( t.text ) will result in an error, as it is converted into a query using "=".
What I did not tell - I thought it is irrelevant - is, that I use LINQ-to-ORM (LLBLGen in this case).
What I tried instead:
var q = from t in customer
where compare.Any( x => t.text.Contains(x) )
select t;
Now this did not work also. Currently I'm not at work, but the exception was something with a ConstantExpression not being convertable into a SetExpression.
I hope this gave some clarification.
EDIT2:
Joseph pointed this out to me: PredicateBuilder. It creates an Expression on a given ObjectType.
Now my problem is, that my type is an anonymous type out of multiple joins.
Is there an easy or elegant way to handle this?
Now I might be missing something, but your code looks like it should work. Did you include the namespaces at the top of the file?
using System.Linq;
using System.Linq.Expressions;
You could also rewrite it without the Linq2Sql syntax, like:
var q = customer.Where(c => compare.Contains(c.text));
You could build your query using LinqKit's free predicate builder class. Here is a blog post which describes its use and has a link to the download site.
http://thecodeslinger.wordpress.com/2008/10/28/linqkit-predicatebuildert-goodness/
Below is a code sample from the post
//First get a list of keywords that match the description entered.
string[] parts = txtInclude.Text.Split(new[] {‘ ‘});
string[] noparts = null;
if(txtButNot.Text.Trim().Length > 0)
noparts = txtExclude.Text.Trim().Split(new[] {‘ ‘});
var pred = PredicateBuilder.True<Pet>();
//here is where you would loop through your compare object
parts.ForEach(p => pred = pred.And(pl => pl.description.Contains(p)));
if(noparts != null)
noparts.ForEach(p => pred = pred.And(pl => !pl.description.Contains(p)));
var pets = from s in db.Pets.Where(pred)
select s;
You have to convert the text field to string
var query = from t in dataContext.table
where compare.Contains(t.textField.ToString())
select t;
I use codeigniter and have an issue about SELECT MAX ... I couldnot find any solution at google search...
it looks like it returns only id :/ it's giving error for other columns of table :/
Appreciate helps, thanks!
Model:
function get_default()
{
$this->db->select_max('id');
$query = $this->db->getwhere('gallery', array('cat' => "1"));
if($query->num_rows() > 0) {
return $query->row_array(); //return the row as an associative array
}
}
Controller:
$default_img = $this->blabla_model->get_default();
$data['default_id'] = $default_img['id']; // it returns this
$data['default_name'] = $default_img['gname']; // it gives error for gname although it is at table
To achieve your goal, your desire SQL can look something like:
SELECT *
FROM gallery
WHERE cat = '1'
ORDER BY id
LIMIT 1
And to utilise CodeIgniter database class:
$this->db->select('*');
$this->db->where('cat', '1');
$this->db->order_by('id', 'DESC');
$this->db->limit(1);
$query = $this->db->get('gallery');
That is correct: select_max returns only the value, and no other column. From the specs:
$this->db->select_max('age');
$query = $this->db->get('members');
// Produces: SELECT MAX(age) as age FROM members
You may want to read the value first, and run another query.
For an id, you can also use $id = $this->db->insert_id();
See also: http://www.hostfree.com/user_guide/database/active_record.html#select
CodeIgniter will select * if nothing else is selected. By setting select_max() you are populating the select property and therefore saying you ONLY want that value.
To solve this, just combine select_max() and select():
$this->db->select('somefield, another_field');
$this->db->select_max('age');
or even:
$this->db->select('sometable.*', FALSE);
$this->db->select_max('age');
Should do the trick.
It should be noted that you may of course also utilize your own "custom" sql statements in CodeIgniter, you're not limited to the active record sql functions you've outlined thus far. Another active record function that CodeIgniter provides is $this->db->query(); Which allows you to submit your own SQL queries (including variables) like so:
function foo_bar()
{
$cat = 1;
$limit = 1;
$sql = "
SELECT *
FROM gallery
WHERE cat = $cat
ORDER BY id
LIMIT $limit
";
$data['query'] = $this->db->query($sql);
return $data['query'];
}
Recently I have been utilizing this quite a bit as I've been doing some queries that are difficult (if not annoying or impossible) to pull off with CI's explicit active record functions.
I realize you may know this already, just thought it would help to include for posterity.
2 helpful links are:
http://codeigniter.com/user_guide/database/results.html
http://codeigniter.com/user_guide/database/examples.html
I'm doing the following:
public MyItem FetchSingleItem(int id)
{
string query = "SELECT Something FROM Somewhere WHERE MyField = {0}";
IEnumerable<MyItem> collection = this.ExecuteQuery<MyItem>(query, id);
List<MyItem> list = collection.ToList<MyItem>();
return list.Last<MyItem>();
}
It's not very elegant really and I was hoping there's something a little better to get a single item out using DataContext. I'm extending from DataContext in my repository. There's a valid reason why before you ask, but that's not the point in this question ;)
So, any better ways of doing this?
Cheers
If it is SQL Server, change your SQL to:
SELECT TOP 1 Something FROM Somewhere ...
Or alternatavely, change these lines
List<MyItem> list = collection.ToList<MyItem>();
return list.Last<MyItem>();
into this one:
return collection.First();
myDataContext.MyItem.Where(item => item.MyField == id)
.Select(item => item.Something)
.FirstOrDefault();
The record returned is undefined, since you have no ORDER BY. So it's hard to do an exact translation. In general, though, reverse the order and take the First():
var q = from s in this.Somewhere
where s.MyField == id
orderby s.Something desc
select s.Something;
return q.First();
Relational tables are unordered. So if you don't specify the record you want precisely, you must consider the returned record as randomly selected.