How would I construct an IN clause in cfscript? Here's what I have:
var tagList = "301,302,303,304";
var q = new Query ();
q.setDatasource ("mydatasource");
var sqlStmt = "SELECT * FROM Tags WHERE tagID IN (:tagList)";
// I know the next line is not correct!
q.addParam (name="tagList", value="#tagList#", cfsqltype="??? WHAT SHOULD IT BE ???");
Is there an easy way to do this, or do I need to iterate through the list of tags, adding each one separately?
There is a list attribute on <cfqueryparam> which ought to be supported:
q.addParam (name="tagList", value="#tagList#", cfsqltype="CF_SQL_INTEGER", list="yes");
Related
How do I get my "ALL" at the top of the list?
When I use .Insert(0, "ALL") it doesn't work either.
CODE:
// Category
var CategoryFilter = (from r in _context.INT_CertificationCategories select r.Category).Distinct().ToList();
CategoryFilter.Add("ALL");
ViewBag.CategoryList = CategoryFilter;
Use the following code:
CategoryFilter.Insert(0,"ALL")
In RavenDB (build 2330) I'm trying to order my results by the string length of one of the indexed terms.
var result = session.Query<Entity, IndexDefinition>()
.Where(condition)
.OrderBy(x => x.Token.Length);
However the results look to be un-sorted. Is this possible in RavenDB (or via a Lucene query) and if so what is the syntax?
You need to add a field to IndexDefinition to order by, and define the SortOption to Int or something more appropriate (however you don't want to use String which is default).
If you want to use the Linq API like in your example you need to add a field named Token_Length to the index' Map function (see Matt's comment):
from doc in docs
select new
{
...
Token_Length = doc.TokenLength
}
And then you can query using the Linq API:
var result = session.Query<Entity, IndexDefinition>()
.Where(condition)
.OrderBy(x => x.Token.Length);
Or if you really want the field to be called TokenLength (or something other than Token_Length) you can use a LuceneQuery:
from doc in docs
select new
{
...
TokenLength = doc.Token.Length
}
And you'd query like this:
var result = session.Advanced.LuceneQuery<Entity, IndexDefinition>()
.Where(condition)
.OrderBy("TokenLength");
I want to perform the following query using Dapper, which currently doesn't return expected results (I think it must be treating the #pName param as literal text within the single quotes?):
var q = "SELECT * FROM Users WHERE Name LIKE '#pName%'";
#pName is the param I assign a value to upon executing the query.
Things work if I just build the SQL like:
var q = "SELECT * FROM Users WHERE Name LIKE '" + name + "%'";
.. but I would prefer to use a param if possible.
I am executing the query using the following code:
o = _cn.Query<User>(q, new { pName = new DbString { Value = name, IsFixedLength = false, Length = 25, IsAnsi = true } }).ToList();
How do I got about this using Dapper?
SELECT * FROM Users WHERE Name LIKE #pName + '%'
I would like to add here another possible solution:
var results = cn.Query("SELECT * FROM Table WHERE Column LIKE #value", new { value = value + "%" });
The wildcard is inside the string var itself, and then we reference that var in the SQL. Applies to any wildcard pattern you want.
I have a query that looks like this:
IQueryable<Profile> profiles = from p in connection.Profiles
where profile.Email.Contains(txtSearch)
select p;
I know that when this is converted to SQL it uses a LIKE '%<value of txtSearch>%' but if txtSearch = "jon%gmail.com" it converts it to `LIKE '%jon~%gmail.com%'. The ~ escapes the % in the middle that is a wild card. How do I get around that? I need to be able to put wild cards into my LINQ to EF searches.
I'm not sure that this is possible directly with linq because you can call only basic string functions like Contains, StartsWith or EndsWith. It is possible with Entity SQL so you can combine these approaches.
var query = new ObjectQuery<Profile>(
#"SELECT VALUE p
FROM CsdlContainerName.Profiles AS p
WHERE p.Email LIKE '" + wildcardSearch + "'",
context);
var result = query.AsQueryable().OrderByDescending(p => p.Name).ToList();
ESQL injection strikes back :)
Second version without injection vulnerability (I didn't try it but it should work):
var commandText =
#"SELECT VALUE p
FROM CsdlContainerName.Profiles AS p
WHERE p.Email LIKE #search";
var query = new ObjectQuery<Profile>(commandText, context);
query.Parameters.Add(new ObjectParameter("search", wildcardSearch));
var result = query.AsQueryable().OrderByDescending(p => p.Name).ToList();
My Sql Query in Vb.net is like this:
Dim TableName As String ="City"
Dim Str As String="Select * from "+TableName+""
I got TableName from another Form .how we can do this in linq?
can we use TableName in Linq query dynamically?
please help me?
Sorry for my example being in C#, but my Vb is rusty. I can read it, but not write it very well off the top of my head.
The best way I can think to do this is to use reflection and extension methods rather than LINQ syntax.
PropertyInfo info = dataContext.GetType().GetProperty( "City" );
IQueryable table = info.GetValue( dataContext, null ) as IQueryable;
var query = table.Where( t => t.Column == "Value" )
.Select( t => t.OtherColumn );
I'm assuming LINQtoSQL in this example and so am getting the object from the datacontext. If you're using something else, you'll need to adjust the method of finding the object.
You could also use a stack of if-then statements based on the value of the table name. If the number of possible tables was fixed and small, this might be better.
i got the idea, thanks, very helpful, however i couldnt be able to see those properties.
string linqObjectName = "Test";
PropertyInfo info = db.GetType().GetProperty(linqObjectName);
IQueryable table = info.GetValue(db, null) as IQueryable;
PropertyInfo[] properties = table.GetType().GetProperties();
ltr.Text += "properties: <hr size=1/>";
foreach (PropertyInfo p in properties)
{
ltr.Text += p.Name + "<br />";
}
and thats the result;
properties:
Context
IsReadOnly
Edit: I found it!
PropertyInfo[] properties =
table.Where("WebRef = \"" + webref + "\"").ElementType.GetProperties();