I am working with quicktable queries and everything seems to be fine.
Now I want to perform queries using like operators. For instance in PHP I can do something like:
$data ='content to search';
$stmt = $db->prepare('SELECT * FROM members where name like :name OR email like :email limit 20');
$stmt->execute(array(
':name' => '%'.$data.'%',
':email' => '%'.$data.'%',
));
Now in quick table, I have tried using CT, EX or HAS parameter etc with OR Operators. Only CT gives nearby result but not exact as per code below.
//Email = 7
//name =8
{
"from": "tableId",
"where": "{7.CT.'nancy#gmail.com'}OR{8.CT.'nancy'}"
}
Is there any way I can obtain a better search with like operators with Quickbase. The documentation here does not cover that.
CT is the closest string comparison operator in Quick Base to LIKE in SQL, but since you can't use wildcards in Quick Base queries you might need to group multiple query strings to achieve the same result. The is also a SW operator that can sometimes come in helpful for comparing parts of a strings.
Related
A field with name 'Field' is checked against multiple values, right now am doing something as shown below:
ARRAY_CONTAINS(Field, "Value1")) OR
ARRAY_CONTAINS(Field, "Value2")) OR
ARRAY_CONTAINS(Field, "Value3"))
Instead is there a Linq query equivalent to just do something like Field.Contains("Value1", "Value2", "Value3"). If one exists, how is it written as Linq expression. Thanks!
You could use Enumerable.Intersect for the purpose.
if(sourceArray.Intersect(elementsToSearch).Any())
{
}
Where elementsToSearch to search are collection of values you want to compare against.
Select * from web_data where Title like "%Lawn%" || Title like "%silk%"......and so on.
Lawn, Silk etc are in List<web_data>. So i'm looking for a way to search those substrings in the Title column(discription property). One of them must be contained, then the row should be returned.
I've tried this
query = query
.Where(x => filter.FabricType.Any(f => x.discription.Contains(x.discription)))
.AsQueryable();
It's not working. That linq to sql code returns an error:
Local sequence cannot be used in LINQ to SQL implementations of query operators except the Contains operator.
any alternatives?
You can use Contains() or You can also use .StartsWith() or .EndsWith().
collListItem.Where(x => x.discription.Contains("Lawn") || x.discription.Contains("silk")).ToList();
I am creating an API in Laravel and using query strings to handle complex queries.
It is easy to handle queries like url/item/?color=red&age=3... to collect all items that are red and 3 years old.
But this is because these are discrete variables being queried for equality. Say for example I want to retrieve all users who registered after a certain date. How would I handle this?
I was thinking maybe:
url/item/?registered_later_than=DDMMYYYY
Is there a better way?
I'd suggest something like this:
url/item/?registered=>:DDMMYYYY
The parameter name is the name of the attribute
Right at the beginning of the parameter value is the operator
Operator and value is separated by a : (it actually can be any separation character you want)
Other examples:
url/item/?name=like:foo
url/item/?email==:foo.bar#example.com
I agree email==:foo looks a bit weird. You could also use words or abbreviations ("eq", "gt", etc) instead of operator signs.
How to parse it
$filters = Input::all();
$query = Model::newQuery();
foreach($filters as $attribute => $filter){
$parts = explode(':', $filter, 2);
$operator = $parts[0];
$value = $parts[1];
$query->where($attribute, $operator, $value);
}
I hope this gives you an idea how you could do it ;)
Not really a "better way" but you can try something like this :
url/item/?operator=lt&date=20141223
Operator can be :
lt : lesser than
gt : greater than
eq : equals to
etc.
Or whatever you want (maybe it's more readable with in full text: "greater_than", etc.). Hope I understood well your question and it will help you.
I'm building a advanced search functionality and, thanks to the help of some ruby fellows on SO, I've been already able to combine AND and OR conditions programmatically on different fields of the same class.
I ended up writing something similar to the accepted answer mentioned above, which I report here:
query = criteria.each_with_object({}) do |(field, values), query|
field = field.in if(values.is_a?(Array))
query[field] = values
end
MyClass.where(query)
Now, what might happen is that someone wants to search on a certain field with multiple criteria, something like:
"all the users where names contains 'abc' but not contains 'def'"
How would you write the query above?
Please note that I already have the regexes to do what I want to (see below), my question is mainly on how to combine them together.
#contains
Regex.new('.*' + val + '.*')
#not contains
Regex.new('^((?!'+ val +').)*$')
Thanks for your time!
* UPDATE *
I was playing with the console and this is working:
MyClass.where(name: /.*abc.*/).and(name: /^((?!def).)*$/)
My question remains: how do I do that programmatically? I shouldn't end up with more than two conditions on the same field but it's something I can't be sure of.
You could use an :$and operator to combine the individual queries:
MyClass.where(:$and => [
{ name: /.*abc.*/ },
{ name: /^((?!def).)*$/ }
])
That would change the overall query builder to something like this:
components = criteria.map do |field, value|
field = field.in if(value.is_a?(Array))
{ field => value }
end
query = components.length > 1 ? { :$and => components } : components.first
You build a list of the individual components and then, at the end, either combine them with :$and or, if there aren't enough components for :$and, just unwrap the single component and call that your query.
I have an application that manages documents called Notes. Like a blog, Notes can be searched for matches against one or more Tags, which are contained in a Note.Tags collection property. A Tag has Name and ID properties, and matches are made against the ID. A user can specify multiple tags to match against, in which case a Note must contain all Tags specified to match.
I have a very complex LINQ query to perform a Note search, with extension methods and looping. Quite frankly, it has a real code smell to it. I want to rewrite the query with something much simpler. I know that if I made the Tag a simple string, I could use something like this:
var matchingNotes = from n in myNotes
where n.Tags.All(tag => searchTags.Contains(tag))
Can I do something that simple if my model uses a Tag object with an ID? What would the query look like. Could it be written in fluent syntax? what would that look like?
I believe you can find notes that have the relevant tags in a single LINQ expression:
IQueryable<Note> query = ... // top part of query
query = query.Where(note => searchTags.All(st =>
note.Tags.Any(notetag => notetag.Id == st.Id)));
Unfortunately there is no “fluent syntax” equivalent for All and Any, so the best you can do there is
query = from note in query
where searchTags.All(st =>
note.Tags.Any(notetag => notetag.Id == st.Id))
select note;
which is not that much better either.
For starters see my comment; I suspect the query is wrong anyway! I would simplifiy it, by simply enforcing separately that each tag exists:
IQueryable<Note> query = ... // top part of query
foreach(var tagId in searchTagIds) {
var tmpId = tagId; // modified closures...
query = query.Where(note => note.Tags.Any(t => t.Id == tmpId));
}
This should have the net effect of enforcing all the tags specified are present and accounted for.
Timwi's solution works in most dialects of LINQ, but not in Linq to Entities. I did find a single-statement LINQ query that works, courtesy of ReSharper. Basically, I wrote a foreach block to do the search, and ReSharper offered to convert the block to a LINQ statement--I had no idea it could do this.
I let ReSharper perform the conversion, and here is what it gave me:
return searchTags.Aggregate<Tag, IQueryable<Note>>(DataStore.ObjectContext.Notes, (current, tag) => current.Where(n => n.Tags.Any(t => t.Id == tag.Id)).OrderBy(n => n.Title));
I read my Notes collection from a database, using Entity Framework 4. DataStore is the custom class I use to manage my EF4 connection; it holds the EF4 ObjectContext as a property.