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// file : odb/oracle/connection.cxx
// author : Constantin Michael <constantin@codesynthesis.com>
// copyright : Copyright (c) 2005-2011 Code Synthesis Tools CC
// license : ODB NCUEL; see accompanying LICENSE file
#include <string>
#include <oci.h>
#include <odb/oracle/database.hxx>
#include <odb/oracle/connection.hxx>
#include <odb/oracle/transaction.hxx>
#include <odb/oracle/error.hxx>
#include <odb/oracle/exceptions.hxx>
#include <odb/oracle/auto-descriptor.hxx>
#include <odb/oracle/statement-cache.hxx>
using namespace std;
namespace odb
{
namespace oracle
{
connection::
connection (database_type& db)
: odb::connection (db),
db_ (db),
statement_cache_ (new statement_cache_type (*this)),
lob_buffer_ (0)
{
sword r (0);
{
OCIError* e (0);
r = OCIHandleAlloc (db_.environment (),
reinterpret_cast<void**> (&e),
OCI_HTYPE_ERROR,
0,
0);
if (r != OCI_SUCCESS)
throw invalid_oci_handle ();
error_.reset (e);
}
auto_handle<OCIAuthInfo> auth_info;
{
OCIAuthInfo* a (0);
r = OCIHandleAlloc (db_.environment (),
reinterpret_cast<void**> (&a),
OCI_HTYPE_AUTHINFO,
0,
0);
if (r != OCI_SUCCESS)
throw invalid_oci_handle ();
auth_info.reset (a);
}
r = OCIAttrSet (
auth_info,
OCI_HTYPE_AUTHINFO,
reinterpret_cast<text*> (const_cast<char*> (db_.user ().c_str ())),
static_cast <ub4> (db_.user ().size ()),
OCI_ATTR_USERNAME,
error_);
if (r == OCI_ERROR || r == OCI_INVALID_HANDLE)
translate_error (error_, r);
r = OCIAttrSet (
auth_info,
OCI_HTYPE_AUTHINFO,
reinterpret_cast<text*> (const_cast<char*> (db_.password ().c_str ())),
static_cast<ub4> (db_.password ().size ()),
OCI_ATTR_PASSWORD,
error_);
if (r == OCI_ERROR || r == OCI_INVALID_HANDLE)
translate_error (error_, r);
{
OCISvcCtx* s (0);
r = OCISessionGet (
db_.environment (),
error_,
&s,
auth_info,
reinterpret_cast<text*> (const_cast<char*> (db_.db ().c_str ())),
static_cast<ub4> (db_.db ().size ()),
0,
0,
0,
0,
0,
OCI_SESSGET_STMTCACHE);
if (r == OCI_ERROR || r == OCI_INVALID_HANDLE)
translate_error (error_, r);
handle_.reset (s, error_);
}
}
connection::
connection (database_type& db, OCISvcCtx* handle)
: odb::connection (db),
db_ (db),
statement_cache_ (new statement_cache_type (*this)),
lob_buffer_ (0)
{
sword r (0);
{
OCIError* e (0);
r = OCIHandleAlloc (db_.environment (),
reinterpret_cast<void**> (&e),
OCI_HTYPE_ERROR,
0,
0);
if (r != OCI_SUCCESS)
throw invalid_oci_handle ();
error_.reset (e);
}
handle_.reset (handle, error_);
}
connection::
~connection ()
{
// Deallocate prepared statements before we close the connection.
//
statement_cache_.reset ();
}
transaction_impl* connection::
begin ()
{
return new transaction_impl (connection_ptr (inc_ref (this)));
}
unsigned long long connection::
execute (const char* s, std::size_t n)
{
sword r (0);
// OCI requires statement text to be NULL terminated.
//
string sql (s, n);
auto_handle<OCIStmt> stmt;
{
OCIStmt* s (0);
r = OCIStmtPrepare2 (handle_,
&s,
error_,
reinterpret_cast<const text*> (sql.c_str ()),
static_cast<ub4> (sql.size ()),
0,
0,
OCI_NTV_SYNTAX,
OCI_DEFAULT);
if (r == OCI_ERROR || r == OCI_INVALID_HANDLE)
translate_error (error_, r);
stmt.reset (s, OCI_STRLS_CACHE_DELETE, error_);
}
ub2 stmt_type;
r = OCIAttrGet (stmt,
OCI_HTYPE_STMT,
&stmt_type,
0,
OCI_ATTR_STMT_TYPE,
error_);
if (r == OCI_ERROR || r == OCI_INVALID_HANDLE)
translate_error (error_, r);
ub4 row_count (0);
if (stmt_type == OCI_STMT_SELECT)
{
// Do not prefetch any rows.
//
r = OCIStmtExecute (handle_, stmt, error_, 0, 0, 0, 0, OCI_DEFAULT);
if (r == OCI_ERROR || r == OCI_INVALID_HANDLE)
translate_error (error_, r);
// In order to succesfully execute a select statement, OCI/Oracle
// requires that there be OCIDefine handles provided for all select
// list columns. Since we are not interested in any data returned by
// the select statement, all buffer pointers, indication variable
// pointers, and data length pointers are specified as NULL (we still
// specify a valid data type identifier as not doing so results in
// undefined behaviour). This action results in truncation errors
// being returned for all attempted row fetches. However, cursor
// behaviour is normal, thus allowing us to return the row count for
// a select statement.
//
for (ub4 i (1); ; ++i)
{
auto_descriptor<OCIParam> param;
{
OCIParam* p (0);
r = OCIParamGet (stmt,
OCI_HTYPE_STMT,
error_,
reinterpret_cast<void**> (&p),
i);
if (r == OCI_ERROR)
break;
param.reset (p);
}
ub2 data_type;
r = OCIAttrGet (param,
OCI_DTYPE_PARAM,
&data_type,
0,
OCI_ATTR_DATA_TYPE,
error_);
if (r == OCI_ERROR || r == OCI_INVALID_HANDLE)
translate_error (error_, r);
// No need to keep track of the OCIDefine handles - these will
// be deallocated with the statement.
//
OCIDefine* define (0);
r = OCIDefineByPos (stmt,
&define,
error_,
i,
0, // NULL value buffer pointer
0, // zero length value buffer
data_type,
0, // NULL indicator pointer
0, // NULL length data pointer
0, // NULL column level return code pointer
OCI_DEFAULT);
if (r == OCI_ERROR || r == OCI_INVALID_HANDLE)
translate_error (error_, r);
}
while (1)
{
r = OCIStmtFetch2 (stmt, error_, 1, OCI_FETCH_NEXT, 0, OCI_DEFAULT);
if (r == OCI_NO_DATA)
break;
else if (r == OCI_ERROR)
{
sb4 e;
r = OCIErrorGet (error_, 1, 0, &e, 0, 0, OCI_HTYPE_ERROR);
// ORA-01406 is returned if there is a truncation error. We expect
// and ignore all truncation errors.
//
if (e != 1406)
translate_error (error_, r);
}
else if (r == OCI_INVALID_HANDLE)
translate_error (error_, r);
}
}
else
{
// OCIStmtExecute requires a non-zero iters param for DML statements.
//
r = OCIStmtExecute (handle_, stmt, error_, 1, 0, 0, 0, OCI_DEFAULT);
if (r == OCI_ERROR || r == OCI_INVALID_HANDLE)
translate_error (error_, r);
}
r = OCIAttrGet (stmt,
OCI_HTYPE_STMT,
&row_count,
0,
OCI_ATTR_ROW_COUNT,
error_);
if (r == OCI_ERROR || r == OCI_INVALID_HANDLE)
translate_error (error_, r);
return row_count;
}
}
}
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