I am trying to query a comma delimited string using PredicateBuilder. My data set has DAYS in TR format which means Tuesday and Thursday, but my parameter query string will be passed in this way: Day=T,R. My query does not return any data right now so I guess have to use like '%' to get data. Can anyone tell me where the problem is in my linq query below:
public List<myTable> Get(string filter1 = null, string Day = null)
{
if (string.IsNullOrWhiteSpace(filter1) && string.IsNullOrWhiteSpace(Day) )
return new List<myTable>();
IQueryable<myTable> qry = db.myTable.AsQueryable();
var searchPredicate = PredicateBuilder.True<myTable>();
if (filter1 !=null){
searchPredicate = searchPredicate.And(a => a.Column1.Contains(filter1)
}
if (Day != null)
{
//split day string
string[] items = Day.Split(',');
foreach (var item in items)
{
searchPredicate = searchPredicate.And(a => items.Contains("%" + a.DAYS + "%"));
}
}
return qry.where(searchPredicate).ToList();
}
Or, how to create a where Predicate like this: where column1='filter' and (DAYS like 'T%' or DAYS like 'M%') ? Thanks.
Related
I'm new to this and this is my first question.
So far I have this, but it takes a long time to get the record:
public string BuscarPedimento(string patente, string pedimento2, string aduana)
{
using (var context = new DataStage3Context())
{
DsPedimentos pedimento = context.DsPedimentos.FirstOrDefault(p => (p.Patente == patente & p.AduanaDespacho == aduana & p.Pedimento == pedimento2));
if (pedimento == null)
return "";
else
return Convert.ToString(pedimento.Id);
}
}
I am trying to build a search predicate in code that compares two fields in Sitecore and I am getting a strange error message. Basically I have two date fields on each content item - FirstPublishDate (the date that the content item was first published) and LastPublishDate (the last date that the content item was published). I would like to find all content items where the LastPublishDate falls within a certain date range AND where the LastPublishDate does not equal the FirstPublishDate. Using Linq here is my method for generating the predicate...
protected Expression<Func<T, Boolean>> getDateFacetPredicate<T>() where T : MySearchResultItem
{
var predicate = PredicateBuilder.True<T>();
foreach (var facet in myFacetCategories)
{
var dateTo = System.DateTime.Now;
var dateFrom = dateTo.AddDays(facet.Value*-1);
predicate = predicate.And(i => i.LastPublishDate.Between(dateFrom, dateTo, Inclusion.Both)).And(j => j.LastPublishDate != j.FirstPublishDate);
}
return predicate;
}
Then I use this predicate in my general site search code to perform the search as follows: the above predicate gets passed in to this method as the "additionalWhere" parameter.
public static SearchResults<T> GeneralSearch<T>(string searchText, ISearchIndex index, int currentPage = 0, int pageSize = 20, string language = "", IEnumerable<string> additionalFields = null,
Expression<Func<T, Boolean>> additionalWhere = null, Expression<Func<T, Boolean>> additionalFilter = null, IEnumerable<string> facets = null,
Expression<Func<T, Boolean>> facetFilter = null, string sortField = null, SortDirection sortDirection = SortDirection.Ascending) where T : SearchResultItem {
using (var context = index.CreateSearchContext()) {
var query = context.GetQueryable<T>();
if (!string.IsNullOrWhiteSpace(searchText)) {
var keywordPred = PredicateBuilder.True<T>();
// take into account escaping of special characters and working around Sitecore limitation with Contains and Equals methods
var isSpecialMatch = Regex.IsMatch(searchText, "[" + specialSOLRChars + "]");
if (isSpecialMatch) {
var wildcardText = string.Format("\"*{0}*\"", Regex.Replace(searchText, "([" + specialSOLRChars + "])", #"\$1"));
wildcardText = wildcardText.Replace(" ", "*");
keywordPred = keywordPred.Or(i => i.Content.MatchWildcard(wildcardText)).Or(i => i.Name.MatchWildcard(wildcardText));
}
else {
keywordPred = keywordPred.Or(i => i.Content.Contains(searchText)).Or(i => i.Name.Contains(searchText));
}
if (additionalFields != null && additionalFields.Any()) {
keywordPred = additionalFields.Aggregate(keywordPred, (current, field) => current.Or(i => i[field].Equals(searchText)));
}
//query = query.Where(i => (i.Content.Contains(searchText) || i.Name.Contains(searchText))); // more explicit call to check the content or item name for our term
query = query.Where(keywordPred);
}
if (language == string.Empty) {
language = Sitecore.Context.Language.ToString();
}
if (language != null) {
query = query.Filter(i => i.Language.Equals(language));
}
query = query.Page(currentPage, pageSize);
if (additionalWhere != null) {
query = query.Where(additionalWhere);
}
if (additionalFilter != null) {
query = query.Filter(additionalFilter);
}
query = query.ApplySecurityFilter();
FacetResults resultFacets = null;
if (facets != null && facets.Any()) {
resultFacets = facets.Aggregate(query, (current, fname) => current.FacetOn(i => i[fname])).GetFacets();
}
// calling this before applying facetFilter should allow us to get a total facet set
// instead of just those related to the current result set
// var resultFacets = query.GetFacets();
// apply after getting facets for more complete facet list
if (facetFilter != null) {
query = query.Where(facetFilter);
}
if (sortField != null)
{
if (sortDirection == SortDirection.Ascending)
{
query = query.OrderBy(x => x[sortField]);
}
else
{
query = query.OrderByDescending(x => x[sortField]);
}
}
var results = query.GetResults(); // this enumerates the actual results
return new SearchResults<T>(results.Hits, results.TotalSearchResults, resultFacets);
}
}
When I try this I get the following error message:
Server Error in '/' Application.
No constant node in query node of type: 'Sitecore.ContentSearch.Linq.Nodes.EqualNode'. Left: 'Sitecore.ContentSearch.Linq.Nodes.FieldNode'. Right: 'Sitecore.ContentSearch.Linq.Nodes.FieldNode'.
Description: An unhandled exception occurred during the execution of the current web request. Please review the stack trace for more information about the error and where it originated in the code.
Exception Details: System.NotSupportedException: No constant node in query node of type: 'Sitecore.ContentSearch.Linq.Nodes.EqualNode'. Left: 'Sitecore.ContentSearch.Linq.Nodes.FieldNode'. Right: 'Sitecore.ContentSearch.Linq.Nodes.FieldNode'.
Source Error:
Line 548: FacetResults resultFacets = null;
Line 549: if (facets != null && facets.Any()) {
Line 550: resultFacets = facets.Aggregate(query, (current, fname) => current.FacetOn(i => i[fname])).GetFacets();
Line 551: }
Line 552: // calling this before applying facetFilter should allow us to get a total facet set
From what I can understand about the error message it seems to not like that I am trying to compare two different fields to each other instead of comparing a field to a constant. The other odd thing is that the error seems to be pointing to a line of code that has to do with aggregating facets. I did a Google search and came up with absolutely nothing relating to this error. Any ideas?
Thanks,
Corey
I think what you are trying is not possible, and if you look at this that might indeed be the case. A solution that is given there is to put your logic in the index: create a ComputedField that checks your dates and puts a value in the index that you can search on (can be a simple boolean).
You will need to split your logic though - the query on the date range can still be done in the predicate (as it is relative to the current date) but the comparison of first and last should be done on index time instead of on query time.
I have this error can't implicitly convert Enumerable row collection <short> to short in this line of code:
Month = (from item in query select (short)item.Month);
I want to know why and why I can't find distinct() or count method in query variable.
here is my method:
public bool IsEnableAccPosting(
string CompanyCode, DateTime FromDate, DateTime ToDate, out short Month)
{
try
{
o_dmDebitAccounts = new dmDebitAccounts(sysInfo);
bool IsEnable = false;
DataTable dt = o_dmDebitAccounts.GetDebitInterestAccPeriods(CompanyCode);
var query = from data in dt.AsEnumerable()
where data.Field<DateTime>("StartDate") == FromDate &&
data.Field<DateTime>("EndDate") == ToDate
select new
{
Month = Convert.ToInt16(data.Field<short>("Month")),
Year = Convert.ToInt16(data.Field<short>("Year"))
};
Month = (from item in query select (short)item.Month); //heres the error
The field is already typed as an Int16 in the linq query that is performing the operation. You dont need to cast it.
try the following code taken from here
if (query.Any())
{
var result = query.First();
// Console.WriteLine("Results: {0}", result.Month);
Month = result.Month;
}
I have dataset function which is as below,
public DataSet GetUpodBrandList(string criteria, string locationId)
{
using (SqlConnection conn = new SqlConnection(this.ConnectionString))
{
string query;
if (criteria == "")
query = "select distinct brandDesc " +
"from arabia_upod_item_master " +
"where locationId = '" + locationId +
"' order by brandDesc";
else
query = "select distinct brandDesc " +
"from arabia_upod_item_master " +
"where brandDesc like '%" + criteria + "%' " +
"and locationId = '" + locationId + "'
order by brandDesc";
conn.Open();
SqlCommand command = new SqlCommand(query, conn);
return this.ExecuteDatasetStoredProc(command);
}
}
I am trying to convert it into linq as follow,
public static List<DataContext.arabia_upod_item_master> GetUpodBrandList(
string criteria,
string locationId)
{
List<DataContext.arabia_upod_item_master> m =
new List<DataContext.arabia_upod_item_master>();
using (var db = UpodDatabaseHelper.GetUpodDataContext())
{
db.ObjectTrackingEnabled = false;
if (criteria == "")
m = db.arabia_upod_item_masters.Where(
i => i.locationId == Convert.ToInt32(locationId))
.OrderBy(i => i.brandDesc)
.Distinct()
.ToList();
else
m = db.arabia_upod_item_masters.Where(
i => i.brandDesc.Contains(criteria) &&
i.locationId == Convert.ToInt32(locationId))
.OrderBy(i => i.brandDesc)
.Distinct()
.ToList();
return m;
}
}
But I don't know how to select distinct brandDesc in the above function (as in the previous function). I am simply using Distinct(). Is it right? or is there any other way to achieve it? Also, if there was 'case' in query in my old function (i.e the first one above) then how will i convert it to linq in the second function. Any other things to worry about while converting to linq?
Put a .Select(i => i.brandDesc) just before each Distinct call. You'll also need to change your List<x> so x is whatever the type of brandDesc is.
If I were to refactor you whole method, I'd do something like the following. I've pulled out code that is common to both forms of the query, and tweaked in a couple of other places.
public static IList<string/* I assume*/>GetUpodBrandList(
string criteria, string locationId)
{
// only do this once, not once per item.
int locatId = Convert.ToInt32(locationId);
using (var db = UpodDatabaseHelper.GetUpodDataContext())
{
db.ObjectTrackingEnabled = false;
// This is a common start to both versions of the query.
var query = db.arabia_upod_item_masters
.Where(i => i.locationId == locatId);
// This only applies to one version of the query.
if (criteria != "")
{
query = query.Where(i => i.brandDesc.Contains(criteria));
}
// This is a common end to both version of the query.
return query
.Select(i => i.brandDesc)
.Distinct()
// Do the ordering after the distinct as it will
// presumably take less effort?
.OrderBy(i => i.brandDesc)
.ToList();
}
}
I have a array of string say:
String[] Fields=new String[]{RowField,RowField1}
In which I can use the below query to get the values by specifying the values is query i.e RowField and RowField1:
var Result = (
from x in _dataTable.AsEnumerable()
select new
{
Name = x.Field<object>(RowField),
Name1 = x.Field<object>(RowField1)
})
.Distinct();
But if suppose I have many values in the Array like:
String[] Fields= new String[]
{
RowField,
RowField1,
RowField2,
.......
RowField1000
};
How can I use the query here without specifying each of the rowfield in the query?
How can i iterate through the array items inside the LINQ?
According to some suggestions in LINQ query and Array of string I am trying to get the result using the code below.
var result = (from row in _dataTable.AsEnumerable()
let projection = from fieldName in fields
select new {Name = fieldName, Value = row[fieldName]}
select projection.ToDictionary(p=>p.Name,p=>p.Value))
.Distinct();
But the problem is it does not return the distinct values.Any ideas?
Start with distinct DataRows by using this overload of Distinct():
_dataTable.AsEnumerable().Distinct(new DataRowEqualityComparer())
Where DataRowEqualityComparer is:
public class DataRowEqualityComparer : IEqualityComparer<DataRow>
{
public bool Equals(DataRow x, DataRow y)
{
return x.ItemArray.SequenceEqual(y.ItemArray);
}
public int GetHashCode(DataRow obj)
{
return string.Join("", obj.ItemArray).GetHashCode();
}
}