HFSQtLi::CustomFetch Class Reference

Accessor passed to custom data type fetch An instance of this class will be passed as first parameter to customFetch functions (See Custom data types). More...

#include <HFSQtLi.h>

Public Member Functions
template<class ... T>
int	fetch (T &&...value)
	Fetches some values This function is roughly equivalent to calling Query::column. It will fetchone or more values. Note that the function will start fetch from the column following the last fetched column. E.g. in: More...
template<class ... T>
int	fetchIndex (bool strict, int i, T &&...value)
	Fetches some values This function is roughly equivalent to calling Query::column. It will fetch one or more values. Note that the function will start fetchin from the column following the last column fetched by the query. E.g. in: More...
constexpr int	numFetched ()
	Gets the number of columns fetched so far by this custom accessor. Number of fetched column is defined as the maximum column index fetched minus the first column index associated with the accessor plus one. If no column has yet be fetched returns 0. More...

Protected Member Functions
constexpr	CustomFetch (Query *query, bool strict, int base)

Protected Attributes
Query *	m_query
bool	m_strict
int	m_base
int	m_fetched

Friends
class	Query

Detailed Description

Accessor passed to custom data type fetch An instance of this class will be passed as first parameter to customFetch functions (See Custom data types).

The function will be able to use it to bind the columns with value from the object given as second parameter.

Example usage:

struct MyType
{
  int a;
  QString b;
};
 
void customFetch(CustomFetch &fetch, MyType &val)
{
  fetch.fetch(val.a, val.b);
}
 
...
  MyType x;
  db->executeSingleAll<2>("SELECT $1, $2", 3, "Hello, world!", x);
  qDebug()<<x.a<<x.b; // Prints 1 "Hello, world"
...

Member Function Documentation

fetch()

template<class ... T>

int HFSQtLi::CustomFetch::fetch ( T &&...  value )

inline

Fetches some values This function is roughly equivalent to calling Query::column. It will fetchone or more values. Note that the function will start fetch from the column following the last fetched column. E.g. in:

... qry.fetch(a, b, MyCustomType);
 
 void customBindConst(CustomBind &bind, const MyCustomType &val)
{
  int x,y;
  fetch.fetch(x); // This will fetch 3rd column
  fetch.fetch(y); // This will fetch 4th column
}

Parameters

value

Is a list of references to fetch

Returns

0 on error, 1+number of bounded columns on failure

fetchIndex()

template<class ... T>

int HFSQtLi::CustomFetch::fetchIndex ( bool  strict, int  i, T &&...  value  )

inline

Fetches some values This function is roughly equivalent to calling Query::column. It will fetch one or more values. Note that the function will start fetchin from the column following the last column fetched by the query. E.g. in:

... qry.bind(4, 3, MyCustomType);
 
 void customBindConst(CustomBind &bind, const MyCustomType &val)
{
  int x, y;
  fetch.fetchIndex(1. y); // This will fetch 4th column
  fetch.fetchIndex(0, x); // This will fetch 3rd column
}

Parameters

i	1-based index of first column to bind. Note that the 0 column is the one currently binding
value	Is a list of objects to bind

Returns

0 on error, 1+number of bounded columns on failure

numFetched()

constexpr int HFSQtLi::CustomFetch::numFetched ( )

inlineconstexpr

Gets the number of columns fetched so far by this custom accessor. Number of fetched column is defined as the maximum column index fetched minus the first column index associated with the accessor plus one. If no column has yet be fetched returns 0.

Returns

The number of columns fetched so far, or -1 if any error occoured in a fetch

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

• HFSQtLi/HFSQtLi.h