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Wed, Sep 25, 03:29
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text/x-c
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Fri, Sep 27, 03:29 (2 d)
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R3127 blackdynamite
sql_query.hh
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/*
author : Nicolas RICHART <nicolas.richart@epfl.ch>
author : Till JUNGE <till.junge@epfl.ch>
*/
#ifndef __BLACKDYNAMITE_SQL_QUERY__
#define __BLACKDYNAMITE_SQL_QUERY__
#include<pqxx/pqxx>
#include <vector>
#include <tuple>
#include <cmath>
#include <algorithm>
namespace
BlackDynamite
{
/* -------------------------------------------------------------------------- */
template
<
typename
num
>
inline
std
::
string
nan_avoider
(
const
num
&
val
)
{
return
pqxx
::
to_string
(
val
);
}
/* -------------------------------------------------------------------------- */
template
<>
inline
std
::
string
nan_avoider
(
const
double
&
val
)
{
if
(
val
!=
val
)
{
#if PQXX_VERSION_MAJOR < 4
return
"('nan')::double precision"
;
#else
return
"NaN"
;
#endif
}
else
{
/* Postgres has its own range definitions */
double
fval
=
std
::
abs
(
val
);
if
(
fval
<=
1e-307
)
{
#if PQXX_VERSION_MAJOR < 4
return
"(0.0)::double precision"
;
#else
return
"0."
;
#endif
}
else
if
(
fval
>=
1e308
)
{
if
(
val
>
0.
)
{
#if PQXX_VERSION_MAJOR < 4
return
"('infinity')::double precision"
;
#else
return
"Infinity"
;
#endif
}
else
{
#if PQXX_VERSION_MAJOR < 4
return
"('-infinity')::double precision"
;
#else
return
"-Infinity"
;
#endif
}
}
std
::
stringstream
val_rep
;
val_rep
.
precision
(
16
);
val_rep
<<
std
::
scientific
<<
val
;
return
val_rep
.
str
();
}
}
/**
* Simple query handler as a secured transaction
*/
template
<
class
transaction
=
pqxx
::
transaction
<
pqxx
::
read_committed
>
>
class
SQLQuery
:
public
pqxx
::
transactor
<
transaction
>
{
public
:
SQLQuery
(
const
std
::
string
&
sql_query
)
:
sql_query
(
sql_query
)
{
}
protected
:
SQLQuery
()
{}
public
:
virtual
void
operator
()
(
transaction
&
trans
)
{
try
{
this
->
result
=
this
->
execute
(
trans
);
}
catch
(
std
::
runtime_error
&
e
)
{
FATAL
(
"Failed to execute query: "
<<
sql_query
<<
std
::
endl
<<
" with message: "
<<
e
.
what
());
}
}
protected
:
virtual
pqxx
::
result
execute
(
pqxx
::
transaction_base
&
trans
)
{
return
trans
.
exec
(
sql_query
);
}
private
:
std
::
string
sql_query
;
pqxx
::
result
result
;
};
/* ------------------------------------------------------------------------ */
/**
* Simple prepared query this query rely on sql queries previously prepared,
* the SQLQueryPrepareHelper is done to help in this process
*/
template
<
class
transaction
=
pqxx
::
transaction
<
pqxx
::
read_committed
>
,
typename
...
Arguments
>
class
SQLPreparedQuery
:
public
SQLQuery
<
transaction
>
{
public
:
SQLPreparedQuery
(
const
std
::
string
&
query_name
,
Arguments
...
parameters
)
:
query_name
(
query_name
),
parameters
(
std
::
make_tuple
(
parameters
...))
{
}
/* ---------------------------------------------------------------------- */
/// execute a prepared function
protected
:
virtual
pqxx
::
result
execute
(
pqxx
::
transaction_base
&
trans
)
{
pqxx
::
prepare
::
invocation
invoc
=
trans
.
prepared
(
query_name
);
return
this
->
prepared
<
0
,
Arguments
...
>
(
invoc
).
exec
();
}
private
:
template
<
size_t
pos
>
inline
pqxx
::
prepare
::
invocation
&
prepared
(
pqxx
::
prepare
::
invocation
&
invoc
)
{
return
invoc
;
}
template
<
size_t
pos
,
typename
T
,
typename
...
Tail
>
inline
pqxx
::
prepare
::
invocation
&
prepared
(
pqxx
::
prepare
::
invocation
&
invoc
)
{
return
this
->
prepared
<
pos
+
1
,
Tail
...
>
(
this
->
addParameter
(
invoc
,
std
::
get
<
pos
>
(
this
->
parameters
)));
}
template
<
typename
T
>
inline
pqxx
::
prepare
::
invocation
&
addParameter
(
pqxx
::
prepare
::
invocation
&
invoc
,
const
T
&
param
)
{
return
invoc
(
param
);
}
template
<
typename
T
>
struct
NanAvoiderIT
{
const
std
::
string
operator
()(
typename
std
::
vector
<
T
>::
iterator
&
it
)
{
return
nan_avoider
(
*
it
);
}
};
template
<
typename
T
>
inline
pqxx
::
prepare
::
invocation
&
addParameter
(
pqxx
::
prepare
::
invocation
&
invoc
,
const
std
::
vector
<
T
>
&
param
)
{
std
::
string
join
=
nan_avoider
(
param
[
0
]);
for
(
auto
it
=
param
.
begin
()
+
1
;
it
!=
param
.
end
();
++
it
)
{
join
+=
", "
;
join
+=
nan_avoider
(
*
it
);
}
return
invoc
(
"{"
+
join
+
"}"
);
// return invoc("ARRAY [" + pqxx::separated_list(",", param.begin(), param.end(), NanAvoiderIT<T>*() + "]");
}
private
:
std
::
string
query_name
;
std
::
tuple
<
Arguments
...
>
parameters
;
};
/* ------------------------------------------------------------------------ */
#if PQXX_VERSION_MAJOR < 4
/* ---------------------------------------------------------------------- */
// Convertion functions
/// Function to convert a c++ type in a SQL type for the preparation
template
<
typename
T
>
struct
InternalPrepareHelper
{
};
/// convert std::string to "varchar"
template
<>
struct
InternalPrepareHelper
<
std
::
string
>
{
static
const
pqxx
::
prepare
::
declaration
&
addArgumentType
(
const
pqxx
::
prepare
::
declaration
&
decl
)
{
return
decl
(
"varchar"
,
pqxx
::
prepare
::
treat_string
);
}
};
/// convert double to "real"
template
<>
struct
InternalPrepareHelper
<
double
>
{
static
const
pqxx
::
prepare
::
declaration
&
addArgumentType
(
const
pqxx
::
prepare
::
declaration
&
decl
)
{
return
decl
(
"double precision"
);
}
};
/// convert std::vector<double> to "double precision[]"
template
<>
struct
InternalPrepareHelper
<
std
::
vector
<
double
>>
{
static
const
pqxx
::
prepare
::
declaration
&
addArgumentType
(
const
pqxx
::
prepare
::
declaration
&
decl
)
{
return
decl
(
"double precision[]"
);
}
};
/// convert std::vector<int> to "interger[]"
template
<>
struct
InternalPrepareHelper
<
std
::
vector
<
int
>>
{
static
const
pqxx
::
prepare
::
declaration
&
addArgumentType
(
const
pqxx
::
prepare
::
declaration
&
decl
)
{
return
decl
(
"integer[]"
);
}
};
/// convert std::vector<unsigned int> to "interger[]"
template
<>
struct
InternalPrepareHelper
<
std
::
vector
<
UInt
>>
{
static
const
pqxx
::
prepare
::
declaration
&
addArgumentType
(
const
pqxx
::
prepare
::
declaration
&
decl
)
{
return
decl
(
"integer[]"
);
}
};
/// convert int to "interger"
template
<>
struct
InternalPrepareHelper
<
int
>
{
static
const
pqxx
::
prepare
::
declaration
&
addArgumentType
(
const
pqxx
::
prepare
::
declaration
&
decl
)
{
return
decl
(
"integer"
);
}
};
/// convert unsigned int to "interger"
template
<>
struct
InternalPrepareHelper
<
UInt
>
{
static
const
pqxx
::
prepare
::
declaration
&
addArgumentType
(
const
pqxx
::
prepare
::
declaration
&
decl
)
{
return
decl
(
"integer"
);
}
};
/// convert bool to "boolean"
template
<>
struct
InternalPrepareHelper
<
bool
>
{
static
const
pqxx
::
prepare
::
declaration
&
addArgumentType
(
const
pqxx
::
prepare
::
declaration
&
decl
)
{
return
decl
(
"boolean"
);
}
};
#endif
/**
* SQLQueryPrepareHelper
*/
class
SQLQueryPrepareHelper
{
/* ---------------------------------------------------------------------- */
// preparation function
public
:
/// prepare the request in the connection
static
void
prepare
(
pqxx
::
connection_base
&
connection
,
const
std
::
string
&
request_name
,
const
std
::
string
&
sql_request
)
{
connection
.
prepare
(
request_name
,
sql_request
);
}
/// prepare the request in the connection
template
<
typename
...
Arguments
>
static
void
prepare
(
pqxx
::
connection_base
&
connection
,
const
std
::
string
&
request_name
,
const
std
::
string
&
sql_request
)
{
#if PQXX_VERSION_MAJOR < 4
pqxx
::
prepare
::
declaration
decl
=
connection
.
prepare
(
request_name
,
sql_request
);
prepare
<
sizeof
...(
Arguments
),
Arguments
...
>
(
decl
);
#else
connection
.
prepare
(
request_name
,
sql_request
);
#endif
}
static
void
unprepare
(
pqxx
::
connection_base
&
connection
,
const
std
::
string
&
request_name
)
{
connection
.
unprepare
(
request_name
);
}
#if PQXX_VERSION_MAJOR < 4
private
:
template
<
size_t
nb_param
>
static
const
pqxx
::
prepare
::
declaration
&
prepare
(
const
pqxx
::
prepare
::
declaration
&
decl
)
{
return
decl
;
}
template
<
size_t
nb_param
,
typename
T
,
typename
...
Tail
>
static
const
pqxx
::
prepare
::
declaration
&
prepare
(
const
pqxx
::
prepare
::
declaration
&
decl
)
{
return
prepare
<
sizeof
...(
Tail
),
Tail
...
>
(
InternalPrepareHelper
<
T
>::
addArgumentType
(
decl
));
}
#endif
};
}
#endif
//__BLACKDYNAMITE_SQL_QUERY__
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