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|
// file : odb/oracle/statement.cxx
// author : Constantin Michael <constantin@codesynthesis.com>
// copyright : Copyright (c) 2005-2011 Code Synthesis Tools CC
// license : ODB NCUEL; see accompanying LICENSE file
#include <cassert>
#include <limits>
#include <oci.h>
#include <odb/exceptions.hxx> // object_not_persistent
#include <odb/details/unused.hxx>
#include <odb/oracle/database.hxx>
#include <odb/oracle/statement.hxx>
#include <odb/oracle/connection.hxx>
#include <odb/oracle/auto-descriptor.hxx>
#include <odb/oracle/error.hxx>
#include <odb/oracle/exceptions.hxx>
using namespace std;
namespace odb
{
namespace oracle
{
// Mapping of bind::buffer_type values for parameter buffers to their
// equivalent external OCI typecode identifiers.
//
static ub4 param_sqlt_lookup[bind::last] =
{
SQLT_INT, // bind::integer
SQLT_UIN, // bind::uinteger
SQLT_BFLOAT, // bind::binary_float
SQLT_BDOUBLE, // bind::binary_double
SQLT_NUM, // bind::number
SQLT_DAT, // bind::date
SQLT_TIMESTAMP, // bind::timestamp
SQLT_CHR, // bind::string
SQLT_CHR, // bind::nstring
SQLT_BIN, // bind::raw
SQLT_LBI, // bind::blob
SQLT_LNG, // bind::clob
SQLT_LNG // bind::nclob
};
// Mapping of bind::buffer_type values for result buffers to their
// equivalent external OCI typecode identifiers.
//
static ub4 result_sqlt_lookup[bind::last] =
{
SQLT_INT, // bind::integer
SQLT_UIN, // bind::uinteger
SQLT_BFLOAT, // bind::binary_float
SQLT_BDOUBLE, // bind::binary_double
SQLT_NUM, // bind::number
SQLT_DAT, // bind::date
SQLT_TIMESTAMP, // bind::timestamp
SQLT_CHR, // bind::string
SQLT_CHR, // bind::nstring
SQLT_BIN, // bind::raw
SQLT_BLOB, // bind::blob
SQLT_CLOB, // bind::clob
SQLT_CLOB // bind::nclob
};
static sb4
param_callback_proxy (void* context,
OCIBind*,
ub4, // iteration
ub4, // index
void** buffer,
ub4* size,
ub1* piece,
void** indicator)
{
bind& b (*static_cast<bind*> (context));
details::buffer* lob_buffer (
reinterpret_cast<details::buffer*>(b.buffer));
// Only call the callback if the parameter is not NULL.
//
if (*b.indicator != -1)
{
chunk_position pos;
if (!(*b.callback->param) (b.context->param,
reinterpret_cast<ub4*> (b.size),
const_cast<const void**> (buffer),
size,
&pos,
lob_buffer->data (),
lob_buffer->capacity ()))
return OCI_ERROR;
switch (pos)
{
case one_chunk:
{
*piece = OCI_ONE_PIECE;
break;
}
case first_chunk:
{
*piece = OCI_FIRST_PIECE;
break;
}
case next_chunk:
{
*piece = OCI_NEXT_PIECE;
break;
}
case last_chunk:
{
*piece = OCI_LAST_PIECE;
break;
}
}
}
else
*piece = OCI_ONE_PIECE;
*indicator = b.indicator;
return OCI_CONTINUE;
}
//
// statement
//
statement::
statement (connection& conn, const string& s)
: conn_ (conn)
{
OCIError* err (conn_.error_handle ());
OCIStmt* handle (0);
sword r (OCIStmtPrepare2 (conn_.handle (),
&handle,
err,
reinterpret_cast<const text*> (s.c_str ()),
static_cast<ub4> (s.size ()),
0,
0,
OCI_NTV_SYNTAX,
OCI_DEFAULT));
if (r == OCI_ERROR || r == OCI_INVALID_HANDLE)
translate_error (err, r);
stmt_.reset (handle, OCI_STRLS_CACHE_DELETE, err);
}
void statement::
bind_param (bind* b, size_t n)
{
OCIError* err (conn_.error_handle ());
// The parameter position in OCIBindByPos is specified as a 1-based
// index.
//
n++;
for (ub4 i (1); i < n; ++i, ++b)
{
#if OCI_MAJOR_VERSION < 11 || \
(OCI_MAJOR_VERSION == 11 && OCI_MINOR_VERSION < 2)
// Assert if a 64 bit integer buffer type is provided and the OCI
// version is unable to implicitly convert the NUMBER binary data
// to the relevant type.
//
assert ((b->type != bind::integer && b->type != bind::uinteger) ||
b->capacity <= 4);
#endif
bool callback (b->callback != 0);
OCIBind* h (0);
sword r (OCIBindByPos (stmt_,
&h,
err,
i,
callback ? 0 : b->buffer,
// When parameter callbacks are in use, set the
// allowable data length to the maximum
// possible.
//
callback
? std::numeric_limits<sb4>::max ()
: static_cast<sb4> (b->capacity),
param_sqlt_lookup[b->type],
callback ? 0 : b->indicator,
callback ? 0 : b->size,
0,
0,
0,
callback ? OCI_DATA_AT_EXEC : OCI_DEFAULT));
if (r == OCI_ERROR || r == OCI_INVALID_HANDLE)
translate_error (err, r);
if (b->type == bind::nstring || b->type == bind::nclob)
{
ub1 form (SQLCS_NCHAR);
r = OCIAttrSet (h,
OCI_HTYPE_BIND,
&form,
0,
OCI_ATTR_CHARSET_FORM,
err);
if (r == OCI_ERROR || r == OCI_INVALID_HANDLE)
translate_error (err, r);
}
if (callback)
{
details::buffer& lob_buffer (conn_.lob_buffer ());
if (lob_buffer.capacity () == 0)
lob_buffer.capacity (4096);
b->buffer = &lob_buffer;
r = OCIBindDynamic (h, err, b, ¶m_callback_proxy, 0, 0);
if (r == OCI_ERROR || r == OCI_INVALID_HANDLE)
translate_error (err, r);
}
}
}
void statement::
bind_result (bind* b, size_t c, size_t p)
{
ODB_POTENTIALLY_UNUSED (p);
OCIError* err (conn_.error_handle ());
for (size_t i (1); i <= c; ++i, ++b)
{
OCIDefine* h (0);
if (b->type == bind::blob ||
b->type == bind::clob ||
b->type == bind::nclob)
{
// When binding a LOB result, the bind::buffer member is
// reinterpreted as a pointer to an auto_descriptor<OCILobLocator>.
// If the descriptor has not yet been allocated, it is allocated now.
//
auto_descriptor<OCILobLocator>* lob (
reinterpret_cast<auto_descriptor<OCILobLocator>*> (b->buffer));
if (lob->get () == 0)
{
OCILobLocator* h (0);
sword r (OCIDescriptorAlloc (conn_.database ().environment (),
reinterpret_cast<void**> (&h),
OCI_DTYPE_LOB,
0,
0));
// OCIDescriptorAlloc will return OCI_SUCCESS on success, or
// OCI_INVALID_HANDLE on an out-of-memory condition.
//
if (r != OCI_SUCCESS)
throw invalid_oci_handle ();
lob->reset (h);
}
sword r (OCIDefineByPos (stmt_,
&h,
err,
i,
lob,
sizeof (OCILobLocator*),
result_sqlt_lookup[b->type],
b->indicator,
0,
0,
OCI_DEFAULT));
if (r == OCI_ERROR || r == OCI_INVALID_HANDLE)
translate_error (err, r);
// The OCIDefine handle is stored in the size member of the bind in
// case the LOB parameter is rebound. If rebinding is necessary, the
// same OCIDefine handle is used.
//
b->size = reinterpret_cast<ub2*> (h);
// LOB prefetching is only supported in OCI version 11.1 and greater
// and in Oracle server 11.1 and greater. If this code is called
// against a pre 11.1 server, the call to OCIAttrSet will return an
// error code.
//
#if (OCI_MAJOR_VERSION == 11 && OCI_MINOR_VERSION >= 1) \
|| OCI_MAJOR_VERSION > 11
if (p != 0)
{
ub4 n (static_cast<ub4> (p));
r = OCIAttrSet (h,
OCI_HTYPE_DEFINE,
&n,
0,
OCI_ATTR_LOBPREFETCH_SIZE,
err);
if (r == OCI_ERROR || r == OCI_INVALID_HANDLE)
translate_error (err, r);
}
#endif
}
else
{
#if OCI_MAJOR_VERSION < 11 || \
(OCI_MAJOR_VERSION == 11 && OCI_MINOR_VERSION < 2)
// Assert if a 64 bit integer buffer type is provided and the OCI
// version is unable to implicitly convert the NUMBER binary data
// to the relevant type.
//
assert ((b->type != bind::integer && b->type != bind::uinteger) ||
b->capacity <= 4);
#endif
sword r (OCIDefineByPos (stmt_,
&h,
err,
i,
b->buffer,
static_cast<sb4> (b->capacity),
result_sqlt_lookup[b->type],
b->indicator,
b->size,
0,
OCI_DEFAULT));
if (r == OCI_ERROR || r == OCI_INVALID_HANDLE)
translate_error (err, r);
if (b->type == bind::nstring)
{
ub1 form (SQLCS_NCHAR);
r = OCIAttrSet (h,
OCI_HTYPE_DEFINE,
&form,
0,
OCI_ATTR_CHARSET_FORM,
err);
if (r == OCI_ERROR || r == OCI_INVALID_HANDLE)
translate_error (err, r);
}
}
}
}
void statement::
rebind_result (bind* b, size_t c, size_t p)
{
ODB_POTENTIALLY_UNUSED (p);
OCIError* err (conn_.error_handle ());
for (size_t i (1); i <= c; ++i, ++b)
{
if (!(b->type == bind::blob ||
b->type == bind::clob ||
b->type == bind::nclob))
continue;
// When binding a LOB result, the bind::buffer member is
// reinterpreted as a pointer to an auto_descriptor<OCILobLocator>.
// If the descriptor has been reset, it is re-allocated now.
//
auto_descriptor<OCILobLocator>* lob (
reinterpret_cast<auto_descriptor<OCILobLocator>*> (b->buffer));
if (lob->get () == 0)
{
OCILobLocator* h (0);
sword r (OCIDescriptorAlloc (conn_.database ().environment (),
reinterpret_cast<void**> (&h),
OCI_DTYPE_LOB,
0,
0));
// OCIDescriptorAlloc will return OCI_SUCCESS on success, or
// OCI_INVALID_HANDLE on an out-of-memory condition.
//
if (r != OCI_SUCCESS)
throw invalid_oci_handle ();
lob->reset (h);
}
OCIDefine* h (reinterpret_cast<OCIDefine*> (b->size));
sword r (OCIDefineByPos (stmt_,
&h,
err,
i,
lob,
sizeof (OCILobLocator*),
result_sqlt_lookup[b->type],
b->indicator,
0,
0,
OCI_DEFAULT));
if (r == OCI_ERROR || r == OCI_INVALID_HANDLE)
translate_error (err, r);
// LOB prefetching is only supported in OCI version 11.1 and greater
// and in Oracle server 11.1 and greater. If this code is called
// against a pre 11.1 server, the call to OCIAttrSet will return an
// error code.
//
// Note that even though we are re-binding the same handle, we still
// have to reset this attribute. Failing to do so will result in the
// mysterious ORA-03106 fatal two-task communication protocol error.
//
#if (OCI_MAJOR_VERSION == 11 && OCI_MINOR_VERSION >= 1) \
|| OCI_MAJOR_VERSION > 11
if (p != 0)
{
ub4 n (static_cast<ub4> (p));
r = OCIAttrSet (h,
OCI_HTYPE_DEFINE,
&n,
0,
OCI_ATTR_LOBPREFETCH_SIZE,
err);
if (r == OCI_ERROR || r == OCI_INVALID_HANDLE)
translate_error (err, r);
}
#endif
}
}
void statement::
stream_result (bind* b, size_t c)
{
OCIError* err (conn_.error_handle());
for (size_t i (0); i < c; ++i, ++b)
{
// Only stream if the bind specifies a LOB type, and the LOB value is
// not NULL, and a result callback has been provided.
//
if ((b->type == bind::blob ||
b->type == bind::clob ||
b->type == bind::nclob) &&
*b->indicator != -1 && b->callback->result != 0)
{
auto_descriptor<OCILobLocator>& locator (
*reinterpret_cast<auto_descriptor<OCILobLocator>*> (b->buffer));
ub1 piece (OCI_FIRST_PIECE);
// Setting the value pointed to by the byte_amt argument to 0 on the
// first call to OCILobRead2 instructs OCI to remain in a polling
// state until the EOF is reached, at which point OCILobRead2 will
// return OCI_SUCCESS.
//
ub8 read (0);
ub1 cs_form (b->type == bind::nclob ? SQLCS_NCHAR : SQLCS_IMPLICIT);
// Allocate buffer space if necessary.
//
details::buffer& lob_buffer (conn_.lob_buffer ());
if (lob_buffer.capacity () == 0)
lob_buffer.capacity (4096);
sword r;
do
{
r = OCILobRead2 (conn_.handle (),
err,
locator,
&read,
0,
1,
lob_buffer.data (),
lob_buffer.capacity (),
piece,
0,
0,
0,
cs_form);
if (r == OCI_ERROR || r == OCI_INVALID_HANDLE)
translate_error (err, r);
chunk_position cp;
if (piece == OCI_FIRST_PIECE)
cp = r == OCI_SUCCESS ? one_chunk : first_chunk;
else if (r == OCI_NEED_DATA)
cp = next_chunk;
else
cp = last_chunk;
piece = OCI_NEXT_PIECE;
// OCI generates and ORA-24343 error when an error code is
// returned from a user callback. We simulate this.
//
if (!(*b->callback->result) (b->context->result,
lob_buffer.data (),
static_cast<ub4> (read),
cp))
throw database_exception (24343, "user defined callback error");
} while (r == OCI_NEED_DATA);
}
}
}
statement::
~statement ()
{
}
//
// select_statement
//
select_statement::
~select_statement ()
{
}
select_statement::
select_statement (connection& conn,
const string& s,
binding& param,
binding& result,
size_t lob_prefetch_size)
: statement (conn, s),
result_ (result),
result_version_ (0),
lob_prefetch_size_ (lob_prefetch_size),
done_ (true)
{
bind_param (param.bind, param.count);
bind_result (result.bind, result.count, lob_prefetch_size);
result_version_ = result_.version;
}
select_statement::
select_statement (connection& conn,
const string& s,
binding& result,
size_t lob_prefetch_size)
: statement (conn, s),
result_ (result),
result_version_ (0),
lob_prefetch_size_ (lob_prefetch_size),
done_ (true)
{
bind_result (result.bind, result.count, lob_prefetch_size);
result_version_ = result_.version;
}
void select_statement::
execute ()
{
if (!done_)
free_result ();
OCIError* err (conn_.error_handle ());
// @@ Retrieve a single row into the already bound output buffers as an
// optimization? This will avoid multiple server round-trips in the case
// of a single object load.
//
sword r (OCIStmtExecute (conn_.handle (),
stmt_,
err,
0,
0,
0,
0,
OCI_DEFAULT));
if (r == OCI_ERROR || r == OCI_INVALID_HANDLE)
translate_error (err, r);
done_ = r == OCI_NO_DATA;
#ifndef NDEBUG
ub4 n (0);
r = OCIAttrGet(stmt_, OCI_HTYPE_STMT, &n, 0, OCI_ATTR_PARAM_COUNT, err);
if (r == OCI_ERROR || r == OCI_INVALID_HANDLE)
translate_error (err, r);
// Make sure that the number of columns in the result returned by
// the database matches the number that we expect. A common cause
// of this assertion is a native view with a number of data members
// not matching the number of columns in the SELECT-list.
//
assert (n == result_.count);
#endif
}
select_statement::result select_statement::
fetch ()
{
if (!done_)
{
change_callback* cc (result_.change_callback);
if (cc != 0 && cc->callback != 0)
(cc->callback) (cc->context);
if (result_version_ != result_.version)
{
rebind_result (result_.bind, result_.count, lob_prefetch_size_);
result_version_ = result_.version;
}
sword r (OCIStmtFetch2 (stmt_,
conn_.error_handle (),
1,
OCI_FETCH_NEXT,
0,
OCI_DEFAULT));
if (r == OCI_ERROR || r == OCI_INVALID_HANDLE)
translate_error (conn_.error_handle (), r);
else if (r == OCI_NO_DATA)
done_ = true;
}
return done_ ? no_data : success;
}
void select_statement::
free_result ()
{
if (!done_)
{
sword r (OCIStmtFetch2 (stmt_,
conn_.error_handle (),
0,
OCI_FETCH_NEXT,
0,
OCI_DEFAULT));
if (r == OCI_ERROR || r == OCI_INVALID_HANDLE)
translate_error (conn_.error_handle (), r);
done_ = true;
}
}
//
// insert_statement
//
static sb4
returning_in (void* context,
OCIBind*, // bind
ub4, // iter
ub4, // index
void** buffer,
ub4* size,
ub1* piece,
void** indicator)
{
typedef insert_statement::id_bind_type bind;
bind& b (*static_cast<bind*> (context));
*buffer = 0;
*size = 0;
*piece = OCI_ONE_PIECE;
b.indicator = -1;
*indicator = &b.indicator;
return OCI_CONTINUE;
}
static sb4
returning_out (void* context,
OCIBind*, // bind
ub4, // iter
ub4, // index
void** buffer,
ub4** size,
ub1*, // piece
void** indicator,
ub2** rcode)
{
typedef insert_statement::id_bind_type bind;
bind& b (*static_cast<bind*> (context));
#if (OCI_MAJOR_VERSION == 11 && OCI_MINOR_VERSION >=2) \
|| OCI_MAJOR_VERSION > 11
*buffer = &b.id.value64;
**size = sizeof (unsigned long long);
#else
*buffer = &b.id.value32;
**size = sizeof (unsigned int);
#endif
*indicator = &b.indicator;
*rcode = 0;
return OCI_CONTINUE;
}
insert_statement::
~insert_statement ()
{
}
insert_statement::
insert_statement (connection& conn,
const string& s,
binding& param,
bool returning)
: statement (conn, s)
{
bind_param (param.bind, param.count);
if (returning)
{
OCIError* err (conn_.error_handle ());
OCIBind* h (0);
sword r (OCIBindByPos (stmt_,
&h,
err,
param.count + 1,
0,
#if (OCI_MAJOR_VERSION == 11 && OCI_MINOR_VERSION >=2) \
|| OCI_MAJOR_VERSION > 11
sizeof (unsigned long long),
#else
sizeof (unsigned int),
#endif
SQLT_UIN,
0,
0,
0,
0,
0,
OCI_DATA_AT_EXEC));
if (r == OCI_ERROR || r == OCI_INVALID_HANDLE)
translate_error (err, r);
r = OCIBindDynamic (h,
err,
&id_bind_,
&returning_in,
&id_bind_,
&returning_out);
if (r == OCI_ERROR || r == OCI_INVALID_HANDLE)
translate_error (err, r);
}
}
bool insert_statement::
execute ()
{
OCIError* err (conn_.error_handle ());
sword r (OCIStmtExecute (conn_.handle (),
stmt_,
err,
1,
0,
0,
0,
OCI_DEFAULT));
if (r == OCI_ERROR || r == OCI_INVALID_HANDLE)
{
sb4 e;
OCIErrorGet (err, 1, 0, &e, 0, 0, OCI_HTYPE_ERROR);
// The Oracle error code ORA-00001 indicates unique constraint
// violation, which covers more than just a duplicate primary key.
// Unfortunately, there is nothing more precise that we can use.
//
if (e == 1)
return false;
else
translate_error (err, r);
}
ub4 row_count (0);
r = OCIAttrGet (stmt_,
OCI_HTYPE_STMT,
&row_count,
0,
OCI_ATTR_ROW_COUNT,
err);
if (r == OCI_ERROR || r == OCI_INVALID_HANDLE)
translate_error (err, r);
// The value of the OCI_ATTR_ROW_COUNT attribute associated with an
// INSERT statment represents the number of rows inserted.
//
return row_count != 0;
}
unsigned long long insert_statement::
id ()
{
#if (OCI_MAJOR_VERSION == 11 && OCI_MINOR_VERSION >=2) \
|| OCI_MAJOR_VERSION > 11
return id_bind_.id.value64;
#else
return id_bind_.id.value32;
#endif
}
//
// update_statement
//
update_statement::
~update_statement ()
{
}
update_statement::
update_statement (connection& conn,
const string& s,
binding& param)
: statement (conn, s)
{
bind_param (param.bind, param.count);
}
unsigned long long update_statement::
execute ()
{
OCIError* err (conn_.error_handle ());
sword r (OCIStmtExecute (conn_.handle (),
stmt_,
err,
1,
0,
0,
0,
OCI_DEFAULT));
if (r == OCI_ERROR || r == OCI_INVALID_HANDLE)
translate_error (err, r);
ub4 row_count (0);
r = OCIAttrGet (stmt_,
OCI_HTYPE_STMT,
&row_count,
0,
OCI_ATTR_ROW_COUNT,
err);
if (r == OCI_ERROR || r == OCI_INVALID_HANDLE)
translate_error (err, r);
// The value of the OCI_ATTR_ROW_COUNT attribute associated with an
// UPDATE statment represents the number of matching rows found. Zero
// indicates no match.
//
return static_cast<unsigned long long> (row_count);
}
//
// delete_statement
//
delete_statement::
~delete_statement ()
{
}
delete_statement::
delete_statement (connection& conn,
const string& s,
binding& param)
: statement (conn, s)
{
bind_param (param.bind, param.count);
}
unsigned long long delete_statement::
execute ()
{
OCIError* err (conn_.error_handle ());
sword r (OCIStmtExecute (conn_.handle (),
stmt_,
err,
1,
0,
0,
0,
OCI_DEFAULT));
if (r == OCI_ERROR || r == OCI_INVALID_HANDLE)
translate_error (err, r);
ub4 row_count (0);
r = OCIAttrGet (stmt_,
OCI_HTYPE_STMT,
&row_count,
0,
OCI_ATTR_ROW_COUNT,
err);
if (r == OCI_ERROR || r == OCI_INVALID_HANDLE)
translate_error (err, r);
return static_cast<unsigned long long> (row_count);
}
}
}
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