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// file : odb/pgsql/statement.hxx
// author : Constantin Michael <constantin@codesynthesis.com>
// copyright : Copyright (c) 2005-2011 Code Synthesis Tools CC
// license : GNU GPL v2; see accompanying LICENSE file
#ifndef ODB_PGSQL_STATEMENT_HXX
#define ODB_PGSQL_STATEMENT_HXX
#include <odb/pre.hxx>
#include <string>
#include <cstddef> // std::size_t
#include <libpq-fe.h>
#include <odb/details/shared-ptr.hxx>
#include <odb/pgsql/version.hxx>
#include <odb/pgsql/binding.hxx>
#include <odb/pgsql/result-ptr.hxx>
#include <odb/pgsql/details/export.hxx>
namespace odb
{
namespace pgsql
{
class connection;
class LIBODB_PGSQL_EXPORT statement: public details::shared_base
{
public:
virtual
~statement () = 0;
// @@ Check section 30.5 of manual for description of
// how to cancel queries in progress.
//
// virtual void
// cancel ();
protected:
statement (connection&,
const std::string& name,
const std::string& stmt,
const Oid* types,
std::size_t types_count);
protected:
// Adapt an ODB binding to a native PostgreSQL parameter binding.
//
static void
bind_param (native_binding&,
const binding&);
// Populate an ODB binding given a PostgreSQL result. If the truncated
// argument is true, then only truncated columns are extracted. Return
// true if all the data was extracted successfully and false if one or
// more columns were truncated.
//
static bool
bind_result (bind*,
std::size_t count,
PGresult*,
std::size_t row,
bool truncated = false);
protected:
connection& conn_;
std::string name_;
};
class LIBODB_PGSQL_EXPORT select_statement: public statement
{
public:
virtual
~select_statement ();
select_statement (connection& conn,
const std::string& name,
const std::string& stmt,
const Oid* types,
std::size_t types_count,
binding& cond,
native_binding& native_cond,
binding& data);
// Common select interface expected by the generated code.
//
public:
enum result
{
success,
no_data,
truncated
};
void
execute ();
// Load next row columns into bound buffers.
//
result
fetch ();
// Reload truncated columns into bound buffers.
//
void
refetch ();
// Free the result set.
//
void
free_result ();
private:
select_statement (const select_statement&);
select_statement& operator= (const select_statement&);
private:
binding& cond_;
native_binding& native_cond_;
binding& data_;
result_ptr result_;
std::size_t row_count_;
std::size_t current_row_;
};
class LIBODB_PGSQL_EXPORT insert_statement: public statement
{
public:
virtual
~insert_statement ();
insert_statement (connection& conn,
const std::string& name,
const std::string& stmt,
const Oid* types,
std::size_t types_count,
binding& data,
native_binding& native_data);
// Return true if successful and false if the row is a duplicate.
// All other errors are reported by throwing exceptions.
//
bool
execute ();
unsigned long long
id ()
{
return id_;
}
private:
insert_statement (const insert_statement&);
insert_statement& operator= (const insert_statement&);
private:
binding& data_;
native_binding& native_data_;
unsigned long long id_;
};
class LIBODB_PGSQL_EXPORT update_statement: public statement
{
public:
virtual
~update_statement ();
// Asssumes that cond.values, cond.lengths, and cond.formats are
// suffixes of data.values, data.lengths, and data.formats
// respectively.
//
update_statement (connection& conn,
const std::string& name,
const std::string& stmt,
const Oid* types,
std::size_t types_count,
binding& cond,
native_binding& native_cond,
binding& data,
native_binding& native_data);
void
execute ();
private:
update_statement (const update_statement&);
update_statement& operator= (const update_statement&);
private:
binding& cond_;
native_binding& native_cond_;
binding& data_;
native_binding& native_data_;
};
class LIBODB_PGSQL_EXPORT delete_statement: public statement
{
public:
virtual
~delete_statement ();
delete_statement (connection& conn,
const std::string& name,
const std::string& stmt,
const Oid* types,
std::size_t types_count,
binding& cond,
native_binding& native_cond);
unsigned long long
execute ();
private:
delete_statement (const delete_statement&);
delete_statement& operator= (const delete_statement&);
private:
binding& cond_;
native_binding& native_cond_;
};
}
}
#include <odb/post.hxx>
#endif // ODB_PGSQL_STATEMENT_HXX
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