mysqlpp::SQLParseElement Struct Reference

Used within Query to hold elements for parameterized queries. More...

#include <qparms.h>

Collaboration diagram for mysqlpp::SQLParseElement:

[legend]List of all members.

Public Member Functions
	SQLParseElement (std::string b, char o, signed char n)
	Create object.
Public Attributes
std::string	before
	string inserted before the parameter
char	option
	the parameter option, or blank if none
signed char	num
	the parameter position to use

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Detailed Description

Used within Query to hold elements for parameterized queries.

Each element has three parts:

The concept behind the before variable needs a little explaining. When a template query is parsed, each parameter is parsed into one of these SQLParseElement objects, but the non-parameter parts of the template also have to be stored somewhere. MySQL++ chooses to attach the text leading up to a parameter to that parameter. So, the before string is simply the text copied literally into the finished query before we insert a value for the parameter.

The option character is currently one of 'q', 'Q', 'r', 'R' or ' '. See the "Template Queries" chapter in the user manual for details.

The position value (num) allows a template query to have its parameters in a different order than in the Query method call. An example of how this can be helpful is in the "Template Queries" chapter of the user manual.

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Constructor & Destructor Documentation

mysqlpp::SQLParseElement::SQLParseElement	(	std::string	b,
		char	o,
		signed char	n
	)			[inline]

Create object.

Parameters:

	b	the 'before' value
	o	the 'option' value
	n	the 'num' value

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The documentation for this struct was generated from the following file:

• qparms.h

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