WhereParser

Overview

The WhereParser class creates new WhereExpression instances based on the provided strings. This parser can be used to process user input and convert it into WhereExpression instances that can be used later to request data from the DataAbstract server.

Please note that the format of the input string is similar to the WHERE clause format for SQL queries.

This code snippet shows how the WhereParser class can be used:

WhereExpression lExpression = WhereParser.Parse("(field1<>21) and (field2='test')");

Location


Class Methods


Parse (String): WhereExpression

Creates a new WhereExpression instance based on the provided string.

A DAException will be raised if it is not possible to parse the provided string successfully.

 

class method Parse(aData: String): WhereExpression

 

static WhereExpression Parse(String aData)

 

Shared Function Parse(aData As String) As WhereExpression

Parameters:

  • aData: String containing the WHERE clause

Instance Methods


Parse

This method parses the WHERE clause string and returns the corresponding WhereExpression instance.

It is used internally during WHERE clause string processing by the Parse class method.

 

method Parse: WhereExpression

 

WhereExpression Parse()

 

Function Parse() As WhereExpression