QueryFilter Property
Selects only the entries that satisfy the specified filter (expression).
Syntax
__property String QueryFilter = {read=FQueryFilter, write=FSetQueryFilter};
Default Value
""
Remarks
This property allows you to specify a filter (expression) in which only the entries that satisfy it will be returned.
Below are the operators supported in the expression language.
Logical Operators
| Operator | Description | Example |
| eq | Equal | "City eq 'Durham'" |
| ne | Not Equal | "City ne 'North Carolina'" |
| gt | Greater Than | "Price gt 20" |
| ge | Greater Than or Equal | "Price ge 10" |
| lt | Less Than | "Price lt 20" |
| le | Less Than Or Equal | "Price le 100" |
| and | Logical And | "Price le 200 and Price gt 3.5 " |
| or | Logical Or | "Price le 3.5 or Price gt 200" |
| not | Logical Not | "not endswith(Description,'milk')" |
Arithmetic Operators
| Operator | Description | Example |
| add | Addition | "Price add 5 gt 10" |
| sub | Subtraction | "Price sub 5 gt 10" |
| mul | Multiplication | "Price mul 2 gt 2000" |
| div | Division | "Price div 2 gt 4" |
| mod | Modulo | "Price mod 2 eq 0" |
Grouping Operators
| Operator | Description | Example |
| ( ) | Precedence Grouping | "(Price sub 5) gt 10 " |
Below are the functions supported in the expression language.
String Functions
| Function | Example |
| bool substringof(string po, string p1) | "substringof('Alfreds', CompanyName) eq true" |
| bool endswith(string p0, string p1) | "endswith(CompanyName, 'Futterkiste') eq true" |
| bool startswith(string p0, string p1) | "startswith(CompanyName, 'Alfr') eq true" |
| int length(string p0) | "length(CompanyName) eq 19" |
| int indexof(string p0, string p1) | "indexof(CompanyName, 'lfreds') eq 1" |
| string replace(string p0, string find, string replace) | "replace(CompanyName, ' ', '') eq 'AlfredsFutterkiste'" |
| string substring(string p0, int pos) | "substring(CompanyName, 1) eq 'lfreds Futterkiste'" |
| string substring(string p0, int pos, int length) | "substring(CompanyName, 1, 2) eq 'lf'" |
| string tolower(string p0) | "tolower(CompanyName) eq 'alfreds futterkiste'" |
| string toupper(string p0) | "toupper(CompanyName) eq 'ALFREDS FUTTERKISTE'" |
| string trim(string p0) | "trim(CompanyName) eq 'Alfreds Futterkiste'" |
| string concat(string p0, string p1) | "concat(concat(City, ', '), Country) eq 'Berlin, Germany'" |
Date Functions
| Function | Example |
| int day(DateTime p0) | "day(BirthDate) eq 8" |
| int hour(DateTime p0) | "hour(BirthDate) eq 0" |
| int minute(DateTime p0) | "minute(BirthDate) eq 0" |
| int month(DateTime p0) | "month(BirthDate) eq 12" |
| int second(DateTime p0) | "second(BirthDate) eq 0" |
| int year(DateTime p0) | "year(BirthDate) eq 1948" |
Math Functions
| Function | Example |
| double round(double p0) | "round(Freight) eq 32" |
| decimal round(decimal p0) | "round(Freight) eq 32" |
| double floor(double p0) | "round(Freight) eq 32" |
| decimal floor(decimal p0) | "floor(Freight) eq 32" |
| double ceiling(double p0) | "ceiling(Freight) eq 33" |
| decimal ceiling(decimal p0) | "floor(Freight) eq 33" |
Type Functions
| Function | Example |
| bool IsOf(type p0) | "isof('NorthwindModel.Order')" |
| bool IsOf(expression p0, type p1) | "isof(ShipCountry, 'Edm.String')" |
This property is not available at design time.
Data Type
String