Class Query

Provides methods to generate query which can be executed against data source using SfDataManager.

Inheritance

System.Object

Query

Namespace: Syncfusion.Blazor.Data

Assembly: Syncfusion.Blazor.dll

Syntax

public class Query : Object

Remarks

Methods in this class are chainable.

Constructors

Query()

Declaration

public Query()

Properties

DataManager

Gets the data manager instance.

Declaration

public DataManager DataManager { get; set; }

Property Value

Type
DataManager

Distincts

Gets the list of distinct values.

Declaration

public List<string> Distincts { get; set; }

Property Value

Type
System.Collections.Generic.List<System.String>

Expands

Specifies the relation table/resource names.

Declaration

public List<object> Expands { get; set; }

Property Value

Type
System.Collections.Generic.List<System.Object>

FKey

Specifies the foreign key value.

Declaration

public string FKey { get; set; }

Property Value

Type
System.String

FromTable

Specifies the table name.

Declaration

public string FromTable { get; set; }

Property Value

Type
System.String

Remarks

Table name is used by the remote adaptors.

GroupedColumns

Gets the group column details.

Declaration

public object[] GroupedColumns { get; set; }

Property Value

Type
System.Object[]

IdMapping

Gets the id mapping value used for child data source process.

Declaration

public string IdMapping { get; set; }

Property Value

Type
System.String

IsChild

Specifies the presence of child.

Declaration

public bool IsChild { get; set; }

Property Value

Type
System.Boolean

IsCountRequired

Specifies that count value is required in responses from remote services.

Declaration

public bool IsCountRequired { get; set; }

Property Value

Type
System.Boolean

Key

Specifies the primary key value.

Declaration

public string Key { get; set; }

Property Value

Type
System.String

Lookups

Specifies the lookup table names.

Declaration

public string[] Lookups { get; set; }

Property Value

Type
System.String[]

Params

Gets the additional parameters to be used.

Declaration

public IDictionary<string, object> Params { get; set; }

Property Value

Type
System.Collections.Generic.IDictionary<System.String, System.Object>

Queries

Provides various method that allow user to generate query. These queries is used by SfDataManager to process given data source and returns resultant records.

Declaration

public DataManagerRequest Queries { get; set; }

Property Value

Type
DataManagerRequest

SortedColumns

Gets the sort column details.

Declaration

public object[] SortedColumns { get; set; }

Property Value

Type
System.Object[]

SubQuery

Specifies the sub query.

Declaration

public Query SubQuery { get; set; }

Property Value

Type
Query

SubQuerySelector

Specifies the sub query details.

Declaration

public string SubQuerySelector { get; set; }

Property Value

Type
System.String

Methods

AddParams(String, Object)

Adds additional parameters to the HTTP request sent by SfDataManager.

Declaration

public Query AddParams(string key, object value)

Parameters

Type	Name	Description
System.String	key	Key value.
System.Object	value	Additional parameter value.

Returns

Type	Description
Query	Query.

Aggregates(String, String)

Performs the aggregate operation in the aggregate type.

Declaration

public Query Aggregates(string field, string type)

Parameters

Type	Name	Description
System.String	field	Specifies the field name.
System.String	type	Specifies the aggregate type.

Returns

Type	Description
Query	Query.

Remarks

Multiple aggregation can be performed by chaining Aggregates method.

Clone()

Performs deep cloning of the given Query.

Declaration

public Query Clone()

Returns

Type	Description
Query	Query.

Distinct(List<String>)

Gets the distinct records of the given field from the data source.

Declaration

public Query Distinct(List<string> fieldNames)

Parameters

Type	Name	Description
System.Collections.Generic.List<System.String>	fieldNames	List of field names.

Returns

Type	Description
Query	Query.

Remarks

Applicable only for ODataV4Adaptor.

Expand(List<String>)

Sets the relational tables to be eager loaded.

Declaration

public Query Expand(List<string> fieldNames)

Parameters

Type	Name	Description
System.Collections.Generic.List<System.String>	fieldNames	List of relational table names.

Returns

Type	Description
Query	Query.

Remarks

Given table names should be eager loaded. Lazy loading is not supported.

From(String)

Adds the table or resource name.

Declaration

public Query From(string tableName)

Parameters

Type	Name	Description
System.String	tableName	Table name.

Returns

Type	Description
Query	Query.

Group(List<String>, IDictionary<String, String>)

Groups the data source.

Declaration

public Query Group(List<string> fieldNames, IDictionary<string, string> groupFormat = null)

Parameters

Type	Name	Description
System.Collections.Generic.List<System.String>	fieldNames	Specifies the column names to group.
System.Collections.Generic.IDictionary<System.String, System.String>	groupFormat	Specifies the group format.

Returns

Type	Description
Query	Query.

Group(String)

Groups the data source.

Declaration

public Query Group(string fieldName)

Parameters

Type	Name	Description
System.String	fieldName	Specifies the column name.

Returns

Type	Description
Query	Query.

Group(String, String)

Groups the data source.

Declaration

public Query Group(string fieldName, string columnFormat)

Parameters

Type	Name	Description
System.String	fieldName	Specifies the column name.
System.String	columnFormat	Specifies the column format.

Returns

Type	Description
Query	Query.

IsEqual(Query, Query)

Compares given Query instance by value.

Declaration

public static bool IsEqual(Query source, Query destination)

Parameters

Type	Name	Description
Query	source	Source Query instance.
Query	destination	Destination Query instance.

Returns

Type
System.Boolean

Page(Int32, Int32)

Sets the current page index and page size.

Declaration

public Query Page(int pageIndex, int pageSize)

Parameters

Type	Name	Description
System.Int32	pageIndex	Specifies the current page.
System.Int32	pageSize	Specifies the page size.

Returns

Type	Description
Query	Query.

Remarks

Use this method to get chunk of records from the given data source.

Range(Int32, Int32)

Gets the range of records.

Declaration

public Query Range(int start, int end)

Parameters

Type	Name	Description
System.Int32	start	Range start index.
System.Int32	end	Range end index.

Returns

Type	Description
Query	Query.

RequiresCount()

Specifies that count is expected in remote service response.

Declaration

public Query RequiresCount()

Returns

Type	Description
Query	Query.

Search(String, List<String>, String, Boolean, Boolean)

Searches the records with the given query.

Declaration

public Query Search(string searchKey, List<string> fieldNames, string operator = null, bool ignoreCase = false, bool ignoreAccent = false)

Parameters

Type	Name	Description
System.String	searchKey	Specifies the search key.
System.Collections.Generic.List<System.String>	fieldNames	Specifies the field names.
System.String	operator	Specifies the search operator.
System.Boolean	ignoreCase	Performs case sensitive search.
System.Boolean	ignoreAccent	Ignore accents/diacritic words during searching.

Returns

Type
Query

Remarks

Multiple Search method can be chained to create complex search criteria.

Select(List<String>)

Selects the given fields from data source.

Declaration

public Query Select(List<string> fieldNames)

Parameters

Type	Name	Description
System.Collections.Generic.List<System.String>	fieldNames	List of fields to select.

Returns

Type	Description
Query	Query.

Skip(Int32)

Sets the skip index.

Declaration

public Query Skip(int skip)

Parameters

Type	Name	Description
System.Int32	skip	Number of records to skip.

Returns

Type	Description
Query	Query.

Skip(Int32, Int32)

Sets the current page index and page size.

Declaration

public Query Skip(int pageIndex, int pageSize)

Parameters

Type	Name	Description
System.Int32	pageIndex	Specifies the current page.
System.Int32	pageSize	Specifies the page size.

Returns

Type	Description
Query	Query.

Sort(String, String)

Sorts the data source.

Declaration

public Query Sort(string name, string direction = null)

Parameters

Type	Name	Description
System.String	name	Specifies the sort name.
System.String	direction	Specifies the sort direction.

Returns

Type	Description
Query	Query.

Sort(String, String, Object)

Sorts the data source.

Declaration

public Query Sort(string name, string direction = null, object comparer = null)

Parameters

Type	Name	Description
System.String	name	Specifies the sort name.
System.String	direction	Specifies the sort direction.
System.Object	comparer	Specifies the comparer object.

Returns

Type	Description
Query	Query.

Take(Int32)

Sets the take index.

Declaration

public Query Take(int pageSize)

Parameters

Type	Name	Description
System.Int32	pageSize	Maximum index of the record.

Returns

Type	Description
Query	Query.

Where(WhereFilter)

Filters the records with the given query.

Declaration

public Query Where(WhereFilter predicate)

Parameters

Type	Name	Description
WhereFilter	predicate	Specifies the predicate to be used.

Returns

Type	Description
Query	Query.

Remarks

Multiple Where method can be chained to create complex filter criteria.

Where(List<WhereFilter>)

Filters the records with the given query.

Declaration

public Query Where(List<WhereFilter> predicates)

Parameters

Type	Name	Description
System.Collections.Generic.List<WhereFilter>	predicates	Specifies the list of predicates to be used.

Returns

Type	Description
Query	Query

Remarks

Multiple Where method can be chained to create complex filter criteria.

Where(String, String, Object, Boolean, Boolean)

Filters the records with the given query.

Declaration

public Query Where(string fieldName, string operator = null, object value = null, bool ignoreCase = false, bool ignoreAccent = false)

Parameters

Type	Name	Description
System.String	fieldName	Specifies the field name.
System.String	operator	Specifies the operator.
System.Object	value	Specifies the filter value.
System.Boolean	ignoreCase	Performs case sensitive filter.
System.Boolean	ignoreAccent	Ignore accents/diacritic words during filtering.

Returns

Type	Description
Query	Query.

Remarks

Multiple Where method can be chained to create complex filter criteria.