# class queryImpl | Abstract parent of implementations of a query for a database provider (See toConnection::connectionImpl and toConnectionProvider) More...
Contains pure virtuals
Full name | `toQuery::queryImpl`
Definition | `#include <toconnection.h>`
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#### Public Methods

- toQuery * query ()
- queryImpl (toQuery *query)
- virtual ~queryImpl ()
- virtual void execute (void)
- virtual toQValue readValue (void)
- virtual bool eof (void)
- virtual int rowsProcessed (void)
- virtual std::list describe (void)
- virtual int columns (void)
- virtual void cancel (void)

## Detailed Description

Abstract parent of implementations of a query for a database provider (See toConnection::connectionImpl and toConnectionProvider)

toQuery * query () | ### query

Get the parent query object. All the parameters of the query must be read from here. nothing is passed to the functions.

queryImpl (toQuery *query) | ### queryImpl

Create a query implementation. The constructor must not perform any actions with the database that could block for a noticable time (Like execute or parse a query). The data for the query may not be available when this object created.

Parameters:

query | Parent query object.

~queryImpl () | ### ~queryImpl

[virtual]

Destroy query implementation.

void execute (void) | ### execute

[pure virtual]

Execute a query. Parameters can be gotten from the toQuery object.

toQValue readValue (void) | ### readValue

[pure virtual]

Read the next value from the stream.

Returns: The value read from the query.

bool eof (void) | ### eof

[pure virtual]

Check if the end of the query has been reached.

Returns: True if all values have been read.

int rowsProcessed (void) | ### rowsProcessed

[pure virtual]

Get the number of rows processed in the last executed query.

std::list describe (void) | ### describe

[pure virtual]

Describe the currently running query.

Returns: A list of column descriptions of the query.

int columns (void) | ### columns

[pure virtual]

Get number of columns in the resultset.

Returns: Column number.

void cancel (void) | ### cancel

[pure virtual]

Cancel the current execution of a query. This will usually be called from another thread than is executing the query.