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nanodbc.cpp
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//! \file nanodbc.cpp Implementation details.
#include "nanodbc.h"
#include <algorithm>
#include <cassert>
#include <clocale>
#include <cstdio>
#include <cstring>
#include <ctime>
#include <map>
#if defined(_MSC_VER) && _MSC_VER <= 1600
// silence spurious Visual C++ warnings
#pragma warning(disable:4244) // warning about integer conversion issues.
#pragma warning(disable:4312) // warning about 64-bit portability issues.
#pragma warning(disable:4996) // warning about snprintf() deprecated.
#endif
#ifdef __APPLE__
// silence spurious OS X deprecation warnings
#define MAC_OS_X_VERSION_MIN_REQUIRED MAC_OS_X_VERSION_10_6
#endif
#ifdef _WIN32
// needs to be included above sql.h for windows
#include <windows.h>
#endif
#include <sql.h>
#include <sqlext.h>
///////////////////////////////////////////////////////////////////////////////
// Unicode Support
///////////////////////////////////////////////////////////////////////////////
#if defined(_MSC_VER)
#ifdef NANODBC_USE_UNICODE
#define NANODBC_TEXT(s) L ## s
#define NANODBC_SSCANF std::swscanf
#define NANODBC_SNPRINTF std::swprintf
#define NANODBC_STRFTIME std::wcsftime
#define NANODBC_STRLEN std::wcslen
#define NANADBC_STRNCMP std::wcsncmp
#define NANODBC_UNICODE(f) f ## W
#define NANODBC_SQLCHAR SQLWCHAR
#else
#define NANODBC_TEXT(s) s
#define NANODBC_SSCANF std::sscanf
#define NANODBC_SNPRINTF _snprintf
#define NANODBC_STRFTIME std::strftime
#define NANODBC_STRLEN std::strlen
#define NANADBC_STRNCMP std::strncmp
#define NANODBC_UNICODE(f) f
#define NANODBC_SQLCHAR SQLCHAR
#endif
#else
#ifdef NANODBC_USE_UNICODE
#define NANODBC_TEXT(s) L ## s
#define NANODBC_SSCANF std::swscanf
#define NANODBC_SNPRINTF std::swprintf
#define NANODBC_STRFTIME std::wcsftime
#define NANODBC_STRLEN std::wcslen
#define NANADBC_STRNCMP std::wcsncmp
#define NANODBC_UNICODE(f) f ## W
#define NANODBC_SQLCHAR SQLWCHAR
#else
#define NANODBC_TEXT(s) s
#define NANODBC_SSCANF std::sscanf
#define NANODBC_SNPRINTF std::snprintf
#define NANODBC_STRFTIME std::strftime
#define NANODBC_STRLEN std::strlen
#define NANADBC_STRNCMP std::strncmp
#define NANODBC_UNICODE(f) f
#define NANODBC_SQLCHAR SQLCHAR
#endif
#endif
///////////////////////////////////////////////////////////////////////////////
// ODBC API Interface
///////////////////////////////////////////////////////////////////////////////
#define NANODBC_STRINGIZE_I(text) #text
#define NANODBC_STRINGIZE(text) NANODBC_STRINGIZE_I(text)
// By making all calls to ODBC functions through this macro, we can easily get
// runtime debugging information of which ODBC functions are being called,
// in what order, and with what parameters by defining NANODBC_ODBC_API_DEBUG.
#ifdef NANODBC_ODBC_API_DEBUG
#include <iostream>
#define NANODBC_CALL_RC(FUNC, RC, ...) \
do { \
std::cerr << __FILE__ ":" NANODBC_STRINGIZE(__LINE__) " " \
NANODBC_STRINGIZE(FUNC) "(" #__VA_ARGS__ ")" << std::endl; \
RC = FUNC(__VA_ARGS__); \
} while(false) \
/**/
#define NANODBC_CALL(FUNC, ...) \
do { \
std::cerr << __FILE__ ":" NANODBC_STRINGIZE(__LINE__) " " \
NANODBC_STRINGIZE(FUNC) "(" #__VA_ARGS__ ")" << std::endl; \
FUNC(__VA_ARGS__); \
} while(false) \
/**/
#else
#define NANODBC_CALL_RC(FUNC, RC, ...) RC = FUNC(__VA_ARGS__)
#define NANODBC_CALL(FUNC, ...) FUNC(__VA_ARGS__)
#endif
///////////////////////////////////////////////////////////////////////////////
// Error and Exception Handling
///////////////////////////////////////////////////////////////////////////////
namespace
{
inline nanodbc::string_type return_code(RETCODE rc)
{
switch(rc)
{
case SQL_SUCCESS: return NANODBC_UNICODE("SQL_SUCCESS");
case SQL_SUCCESS_WITH_INFO: return NANODBC_UNICODE("SQL_SUCCESS_WITH_INFO");
case SQL_ERROR: return NANODBC_UNICODE("SQL_ERROR");
case SQL_INVALID_HANDLE: return NANODBC_UNICODE("SQL_INVALID_HANDLE");
case SQL_NO_DATA: return NANODBC_UNICODE("SQL_NO_DATA");
case SQL_NEED_DATA: return NANODBC_UNICODE("SQL_NEED_DATA");
case SQL_STILL_EXECUTING: return NANODBC_UNICODE("SQL_STILL_EXECUTING");
}
assert(0);
return "unknown"; // should never make it here
}
// Easy way to check if a return code signifies success.
inline bool success(RETCODE rc)
{
#ifdef NANODBC_ODBC_API_DEBUG
std::cerr << "<-- rc: " << return_code(rc) << " | ";
#endif
return rc == SQL_SUCCESS || rc == SQL_SUCCESS_WITH_INFO;
}
// Returns the array size.
template<typename T, std::size_t N>
inline std::size_t arrlen(T(&)[N])
{
return N;
}
// Operates like strlen() on a character array.
template<typename T, std::size_t N>
inline std::size_t strarrlen(T(&a)[N])
{
const T* s = &a[0];
std::size_t i = 0;
while(*s++ && i < N) i++;
return i;
}
// Attempts to get the last ODBC error as a string.
inline std::string last_error(SQLHANDLE handle, SQLSMALLINT handle_type)
{
// last error always retrieved as char*, even in unicode mode
SQLCHAR sql_state[6];
SQLCHAR sql_message[SQL_MAX_MESSAGE_LENGTH];
SQLINTEGER native_error;
SQLSMALLINT total_bytes;
RETCODE rc;
NANODBC_CALL_RC(
SQLGetDiagRec
, rc
, handle_type
, handle
, 1
, sql_state
, &native_error
, sql_message
, sizeof(sql_message)
, &total_bytes);
if(success(rc))
{
std::string status(&sql_state[0], &sql_state[arrlen(sql_state)]);
status += ": ";
status += std::string(&sql_message[0], &sql_message[strarrlen(sql_message)]);
using std::replace;
replace(status.begin(), status.end(), '\0', ' '); // some drivers insert \0 into error messages for unknown reasons
return status;
}
return "Unknown Error: SQLGetDiagRec() call failed";
}
} // namespace
namespace nanodbc
{
type_incompatible_error::type_incompatible_error()
: std::runtime_error("type incompatible") { }
const char* type_incompatible_error::what() const throw()
{
return std::runtime_error::what();
}
null_access_error::null_access_error()
: std::runtime_error("null access") { }
const char* null_access_error::what() const throw()
{
return std::runtime_error::what();
}
index_range_error::index_range_error()
: std::runtime_error("index out of range") { }
const char* index_range_error::what() const throw()
{
return std::runtime_error::what();
}
programming_error::programming_error(const std::string& info)
: std::runtime_error(info.c_str()) { }
const char* programming_error::what() const throw()
{
return std::runtime_error::what();
}
database_error::database_error(void* handle, short handle_type, const std::string& info)
: std::runtime_error(info + last_error(handle, handle_type)) { }
const char* database_error::what() const throw()
{
return std::runtime_error::what();
}
} // namespace nanodbc
// Throwing exceptions using NANODBC_THROW_DATABASE_ERROR enables file name
// and line numbers to be inserted into the error message. Useful for debugging.
#define NANODBC_THROW_DATABASE_ERROR(handle, handle_type) \
throw nanodbc::database_error( \
handle \
, handle_type \
, __FILE__ ":" NANODBC_STRINGIZE(__LINE__) ": ") \
/**/
///////////////////////////////////////////////////////////////////////////////
// Implementation Details
///////////////////////////////////////////////////////////////////////////////
namespace
{
using namespace std; // if int64_t is in std namespace (in c++11)
// A utility for calculating the ctype, sqltype, and format specifiers for the given type T.
// I essentially create a lookup table based on the MSDN ODBC documentation.
// See http://msdn.microsoft.com/en-us/library/windows/desktop/ms714556(v=vs.85).aspx for details.
template<class T>
struct sql_type_info { };
template<>
struct sql_type_info<char>
{
static const SQLSMALLINT ctype = SQL_C_CHAR;
static const SQLSMALLINT sqltype = SQL_CHAR;
static const nanodbc::string_type::value_type* const format;
};
template<>
struct sql_type_info<wchar_t>
{
static const SQLSMALLINT ctype = SQL_C_WCHAR;
static const SQLSMALLINT sqltype = SQL_WCHAR;
static const nanodbc::string_type::value_type* const format;
};
template<>
struct sql_type_info<short>
{
static const SQLSMALLINT ctype = SQL_C_SSHORT;
static const SQLSMALLINT sqltype = SQL_SMALLINT;
static const nanodbc::string_type::value_type* const format;
};
template<>
struct sql_type_info<unsigned short>
{
static const SQLSMALLINT ctype = SQL_C_USHORT;
static const SQLSMALLINT sqltype = SQL_SMALLINT;
static const nanodbc::string_type::value_type* const format;
};
template<>
struct sql_type_info<int32_t>
{
static const SQLSMALLINT ctype = SQL_C_SLONG;
static const SQLSMALLINT sqltype = SQL_INTEGER;
static const nanodbc::string_type::value_type* const format;
};
template<>
struct sql_type_info<uint32_t>
{
static const SQLSMALLINT ctype = SQL_C_ULONG;
static const SQLSMALLINT sqltype = SQL_INTEGER;
static const nanodbc::string_type::value_type* const format;
};
template<>
struct sql_type_info<int64_t>
{
static const SQLSMALLINT ctype = SQL_C_SBIGINT;
static const SQLSMALLINT sqltype = SQL_BIGINT;
static const nanodbc::string_type::value_type* const format;
};
template<>
struct sql_type_info<uint64_t>
{
static const SQLSMALLINT ctype = SQL_C_UBIGINT;
static const SQLSMALLINT sqltype = SQL_BIGINT;
static const nanodbc::string_type::value_type* const format;
};
template<>
struct sql_type_info<float>
{
static const SQLSMALLINT ctype = SQL_C_FLOAT;
static const SQLSMALLINT sqltype = SQL_FLOAT;
static const nanodbc::string_type::value_type* const format;
};
template<>
struct sql_type_info<double>
{
static const SQLSMALLINT ctype = SQL_C_DOUBLE;
static const SQLSMALLINT sqltype = SQL_DOUBLE;
static const nanodbc::string_type::value_type* const format;
};
template<>
struct sql_type_info<std::string>
{
static const SQLSMALLINT ctype = SQL_C_CHAR;
static const SQLSMALLINT sqltype = SQL_VARCHAR;
static const nanodbc::string_type::value_type* const format;
};
template<>
struct sql_type_info<std::wstring>
{
static const SQLSMALLINT ctype = SQL_C_WCHAR;
static const SQLSMALLINT sqltype = SQL_WVARCHAR;
static const nanodbc::string_type::value_type* const format;
};
template<>
struct sql_type_info<nanodbc::date>
{
static const SQLSMALLINT ctype = SQL_C_DATE;
static const SQLSMALLINT sqltype = SQL_DATE;
};
template<>
struct sql_type_info<nanodbc::timestamp>
{
static const SQLSMALLINT ctype = SQL_C_TIMESTAMP;
static const SQLSMALLINT sqltype = SQL_TIMESTAMP;
};
const nanodbc::string_type::value_type* const sql_type_info<wchar_t>::format = NANODBC_TEXT("%lc");
const nanodbc::string_type::value_type* const sql_type_info<short>::format = NANODBC_TEXT("%hd");
const nanodbc::string_type::value_type* const sql_type_info<unsigned short>::format = NANODBC_TEXT("%hu");
const nanodbc::string_type::value_type* const sql_type_info<int32_t>::format = NANODBC_TEXT("%ld");
const nanodbc::string_type::value_type* const sql_type_info<uint32_t>::format = NANODBC_TEXT("%lu");
const nanodbc::string_type::value_type* const sql_type_info<int64_t>::format = NANODBC_TEXT("%ld");
const nanodbc::string_type::value_type* const sql_type_info<uint64_t>::format = NANODBC_TEXT("%lu");
const nanodbc::string_type::value_type* const sql_type_info<float>::format = NANODBC_TEXT("%f");
const nanodbc::string_type::value_type* const sql_type_info<double>::format = NANODBC_TEXT("%lf");
// Converts the given string to the given type T.
template<class T>
inline T convert(const nanodbc::string_type& s)
{
T value;
NANODBC_SSCANF(s.c_str(), sql_type_info<T>::format, &value);
return value;
}
// Encapsulates resources needed for column binding.
class bound_column
{
public:
bound_column()
: name_()
, column_(0)
, sqltype_(0)
, sqlsize_(0)
, scale_(0)
, ctype_(0)
, clen_(0)
, blob_(false)
, rowset_size_(0)
, cbdata_(0)
, pdata_(0)
{
}
~bound_column()
{
delete[] cbdata_;
delete[] pdata_;
}
public:
nanodbc::string_type name_;
short column_;
SQLSMALLINT sqltype_;
SQLULEN sqlsize_;
SQLSMALLINT scale_;
SQLSMALLINT ctype_;
SQLULEN clen_;
bool blob_;
long rowset_size_;
nanodbc::null_type* cbdata_;
char* pdata_;
private:
bound_column(const bound_column& rhs); // not defined
bound_column& operator=(bound_column rhs); // not defined
};
// Allocates the native ODBC handles.
inline void allocate_handle(SQLHENV& env, SQLHDBC& conn)
{
RETCODE rc;
NANODBC_CALL_RC(SQLAllocHandle, rc, SQL_HANDLE_ENV, SQL_NULL_HANDLE, &env);
if(!success(rc))
NANODBC_THROW_DATABASE_ERROR(env, SQL_HANDLE_ENV);
try
{
NANODBC_CALL_RC(SQLSetEnvAttr, rc, env, SQL_ATTR_ODBC_VERSION, (SQLPOINTER)SQL_OV_ODBC3, SQL_IS_UINTEGER);
if(!success(rc))
NANODBC_THROW_DATABASE_ERROR(env, SQL_HANDLE_ENV);
NANODBC_CALL_RC(SQLAllocHandle, rc, SQL_HANDLE_DBC, env, &conn);
if(!success(rc))
NANODBC_THROW_DATABASE_ERROR(env, SQL_HANDLE_ENV);
}
catch(...)
{
NANODBC_CALL(SQLFreeHandle, SQL_HANDLE_ENV, env);
throw;
}
}
} // namespace
///////////////////////////////////////////////////////////////////////////////
// Private Implementation: connection
///////////////////////////////////////////////////////////////////////////////
namespace nanodbc
{
class connection::connection_impl
{
public:
connection_impl()
: env_(0)
, conn_(0)
, connected_(false)
, transactions_(0)
, rollback_(false)
{
allocate_handle(env_, conn_);
}
connection_impl(const string_type& dsn, const string_type& user, const string_type& pass, long timeout)
: env_(0)
, conn_(0)
, connected_(false)
, transactions_(0)
, rollback_(false)
{
allocate_handle(env_, conn_);
try
{
connect(dsn, user, pass, timeout);
}
catch(...)
{
NANODBC_CALL(SQLFreeHandle, SQL_HANDLE_DBC, conn_);
NANODBC_CALL(SQLFreeHandle, SQL_HANDLE_ENV, env_);
throw;
}
}
connection_impl(const string_type& connection_string, long timeout)
: env_(0)
, conn_(0)
, connected_(false)
, transactions_(0)
, rollback_(false)
{
allocate_handle(env_, conn_);
try
{
connect(connection_string, timeout);
}
catch(...)
{
NANODBC_CALL(SQLFreeHandle, SQL_HANDLE_DBC, conn_);
NANODBC_CALL(SQLFreeHandle, SQL_HANDLE_ENV, env_);
throw;
}
}
~connection_impl() throw()
{
try
{
disconnect();
}
catch(...)
{
// ignore exceptions thrown during disconnect
}
NANODBC_CALL(SQLFreeHandle, SQL_HANDLE_DBC, conn_);
NANODBC_CALL(SQLFreeHandle, SQL_HANDLE_ENV, env_);
}
void connect(const string_type& dsn, const string_type& user, const string_type& pass, long timeout)
{
disconnect();
RETCODE rc;
NANODBC_CALL_RC(SQLFreeHandle, rc, SQL_HANDLE_DBC, conn_);
if(!success(rc))
NANODBC_THROW_DATABASE_ERROR(conn_, SQL_HANDLE_DBC);
NANODBC_CALL_RC(SQLAllocHandle, rc, SQL_HANDLE_DBC, env_, &conn_);
if(!success(rc))
NANODBC_THROW_DATABASE_ERROR(env_, SQL_HANDLE_ENV);
NANODBC_CALL_RC(SQLSetConnectAttr, rc, conn_, SQL_LOGIN_TIMEOUT, (SQLPOINTER)timeout, 0);
if(!success(rc))
NANODBC_THROW_DATABASE_ERROR(conn_, SQL_HANDLE_DBC);
NANODBC_CALL_RC(
NANODBC_UNICODE(SQLConnect)
, rc
, conn_
, (NANODBC_SQLCHAR*)dsn.c_str(), SQL_NTS
, !user.empty() ? (NANODBC_SQLCHAR*)user.c_str() : 0, SQL_NTS
, !pass.empty() ? (NANODBC_SQLCHAR*)pass.c_str() : 0, SQL_NTS);
if(!success(rc))
NANODBC_THROW_DATABASE_ERROR(conn_, SQL_HANDLE_DBC);
connected_ = success(rc);
}
void connect(const string_type& connection_string, long timeout)
{
disconnect();
RETCODE rc;
NANODBC_CALL_RC(SQLFreeHandle, rc, SQL_HANDLE_DBC, conn_);
if(!success(rc))
NANODBC_THROW_DATABASE_ERROR(conn_, SQL_HANDLE_DBC);
NANODBC_CALL_RC(SQLAllocHandle, rc, SQL_HANDLE_DBC, env_, &conn_);
if(!success(rc))
NANODBC_THROW_DATABASE_ERROR(env_, SQL_HANDLE_ENV);
NANODBC_CALL_RC(SQLSetConnectAttr, rc, conn_, SQL_LOGIN_TIMEOUT, (SQLPOINTER)timeout, 0);
if(!success(rc))
NANODBC_THROW_DATABASE_ERROR(conn_, SQL_HANDLE_DBC);
NANODBC_SQLCHAR dsn[1024];
SQLSMALLINT dsn_size = 0;
NANODBC_CALL_RC(
NANODBC_UNICODE(SQLDriverConnect)
, rc
, conn_
, 0
, (NANODBC_SQLCHAR*)connection_string.c_str(), SQL_NTS
, dsn
, sizeof(dsn) / sizeof(NANODBC_SQLCHAR)
, &dsn_size
, SQL_DRIVER_NOPROMPT);
if(!success(rc))
NANODBC_THROW_DATABASE_ERROR(conn_, SQL_HANDLE_DBC);
connected_ = success(rc);
}
bool connected() const
{
return connected_;
}
void disconnect()
{
if(connected())
{
RETCODE rc;
NANODBC_CALL_RC(SQLDisconnect, rc, conn_);
if(!success(rc))
NANODBC_THROW_DATABASE_ERROR(conn_, SQL_HANDLE_DBC);
}
connected_ = false;
}
std::size_t transactions() const
{
return transactions_;
}
void* native_dbc_handle() const
{
return conn_;
}
void* native_env_handle() const
{
return env_;
}
string_type driver_name() const
{
NANODBC_SQLCHAR name[1024];
SQLSMALLINT length;
RETCODE rc;
NANODBC_CALL_RC(
NANODBC_UNICODE(SQLGetInfo)
, rc
, conn_
, SQL_DRIVER_NAME
, name
, sizeof(name) / sizeof(NANODBC_SQLCHAR)
, &length);
if(!success(rc))
NANODBC_THROW_DATABASE_ERROR(conn_, SQL_HANDLE_DBC);
return string_type(&name[0], &name[strarrlen(name)]);
}
std::size_t ref_transaction()
{
return --transactions_;
}
std::size_t unref_transaction()
{
return ++transactions_;
}
bool rollback() const
{
return rollback_;
}
void rollback(bool onoff)
{
rollback_ = onoff;
}
private:
connection_impl(const connection_impl&); // not defined
connection_impl& operator=(const connection_impl&); // not defined
private:
HENV env_;
HDBC conn_;
bool connected_;
std::size_t transactions_;
bool rollback_; // if true, this connection is marked for eventual transaction rollback
};
} // namespace nanodbc
///////////////////////////////////////////////////////////////////////////////
// Private Implementation: transaction
///////////////////////////////////////////////////////////////////////////////
namespace nanodbc
{
class transaction::transaction_impl
{
public:
transaction_impl(const class connection& conn)
: conn_(conn)
, committed_(false)
{
if(conn_.transactions() == 0 && conn_.connected())
{
RETCODE rc;
NANODBC_CALL_RC(
SQLSetConnectAttr
, rc
, conn_.native_dbc_handle()
, SQL_ATTR_AUTOCOMMIT
, (SQLPOINTER)SQL_AUTOCOMMIT_OFF
, SQL_IS_UINTEGER);
if(!success(rc))
NANODBC_THROW_DATABASE_ERROR(conn_.native_dbc_handle(), SQL_HANDLE_DBC);
}
conn_.ref_transaction();
}
~transaction_impl() throw()
{
if(!committed_)
{
conn_.rollback(true);
conn_.unref_transaction();
}
if(conn_.transactions() == 0 && conn_.rollback() && conn_.connected())
{
NANODBC_CALL(
SQLEndTran
, SQL_HANDLE_DBC
, conn_.native_dbc_handle()
, SQL_ROLLBACK);
conn_.rollback(false);
NANODBC_CALL(
SQLSetConnectAttr
, conn_.native_dbc_handle()
, SQL_ATTR_AUTOCOMMIT
, (SQLPOINTER)SQL_AUTOCOMMIT_ON
, SQL_IS_UINTEGER);
}
}
void commit()
{
if(committed_)
return;
committed_ = true;
if(conn_.unref_transaction() == 0 && conn_.connected())
{
RETCODE rc;
NANODBC_CALL_RC(
SQLEndTran
, rc
, SQL_HANDLE_DBC
, conn_.native_dbc_handle()
, SQL_COMMIT);
if(!success(rc))
NANODBC_THROW_DATABASE_ERROR(conn_.native_dbc_handle(), SQL_HANDLE_DBC);
}
}
void rollback() throw()
{
if(committed_)
return;
conn_.rollback(true);
}
class connection& connection()
{
return conn_;
}
const class connection& connection() const
{
return conn_;
}
private:
transaction_impl(const transaction_impl&); // not defined
transaction_impl& operator=(const transaction_impl&); // not defined
private:
class connection conn_;
bool committed_;
};
} // namespace nanodbc
///////////////////////////////////////////////////////////////////////////////
// Private Implementation: statement
///////////////////////////////////////////////////////////////////////////////
namespace nanodbc
{
class statement::statement_impl
{
public:
statement_impl()
: stmt_(0)
, open_(false)
, conn_()
, bind_len_or_null_()
{
}
statement_impl(class connection& conn)
: stmt_(0)
, open_(false)
, conn_()
, bind_len_or_null_()
{
open(conn);
}
statement_impl(class connection& conn, const string_type& query, long timeout)
: stmt_(0)
, open_(false)
, conn_()
, bind_len_or_null_()
{
prepare(conn, query, timeout);
}
~statement_impl() throw()
{
if(open() && connected())
{
NANODBC_CALL(SQLCancel, stmt_);
reset_parameters();
NANODBC_CALL(SQLFreeHandle, SQL_HANDLE_STMT, stmt_);
}
}
void open(class connection& conn)
{
close();
RETCODE rc;
NANODBC_CALL_RC(
SQLAllocHandle
, rc
, SQL_HANDLE_STMT
, conn.native_dbc_handle()
, &stmt_);
open_ = success(rc);
if(!open_)
NANODBC_THROW_DATABASE_ERROR(stmt_, SQL_HANDLE_STMT);
conn_ = conn;
}
bool open() const
{
return open_;
}
bool connected() const
{
return conn_.connected();
}
const class connection& connection() const
{
return conn_;
}
class connection& connection()
{
return conn_;
}
void* native_statement_handle() const
{
return stmt_;
}
void close()
{
if(open() && connected())
{
RETCODE rc;
NANODBC_CALL_RC(SQLCancel, rc, stmt_);
if(!success(rc))
NANODBC_THROW_DATABASE_ERROR(stmt_, SQL_HANDLE_STMT);
reset_parameters();
NANODBC_CALL_RC(SQLFreeHandle, rc, SQL_HANDLE_STMT, stmt_);
if(!success(rc))
NANODBC_THROW_DATABASE_ERROR(stmt_, SQL_HANDLE_STMT);
}
open_ = false;
stmt_ = 0;
}
void cancel()
{
RETCODE rc;
NANODBC_CALL_RC(SQLCancel, rc, stmt_);
if(!success(rc))
NANODBC_THROW_DATABASE_ERROR(stmt_, SQL_HANDLE_STMT);
}
void prepare(class connection& conn, const string_type& query, long timeout)
{
open(conn);
prepare(query, timeout);
}
void prepare(const string_type& query, long timeout)
{
if(!open())
throw programming_error("statement has no associated open connection");
RETCODE rc;
NANODBC_CALL_RC(
NANODBC_UNICODE(SQLPrepare)
, rc
, stmt_
, (NANODBC_SQLCHAR*)query.c_str()
, (SQLINTEGER)query.size());
if(!success(rc))
NANODBC_THROW_DATABASE_ERROR(stmt_, SQL_HANDLE_STMT);
this->timeout(timeout);
}
void timeout(long timeout)
{
RETCODE rc;
NANODBC_CALL_RC(
SQLSetStmtAttr
, rc
, stmt_
, SQL_ATTR_QUERY_TIMEOUT
, (SQLPOINTER)timeout,
0);
if(!success(rc))
NANODBC_THROW_DATABASE_ERROR(stmt_, SQL_HANDLE_STMT);
}
result execute_direct(class connection& conn, const string_type& query, long batch_operations, long timeout, statement& statement)
{
open(conn);
RETCODE rc;
NANODBC_CALL_RC(
SQLSetStmtAttr
, rc
, stmt_
, SQL_ATTR_PARAMSET_SIZE
, (SQLPOINTER)batch_operations
, 0);
if(!success(rc))
NANODBC_THROW_DATABASE_ERROR(stmt_, SQL_HANDLE_STMT);
this->timeout(timeout);
NANODBC_CALL_RC(
NANODBC_UNICODE(SQLExecDirect)
, rc
, stmt_
, (NANODBC_SQLCHAR*)query.c_str()
, SQL_NTS);
if(!success(rc) && rc != SQL_NO_DATA)
NANODBC_THROW_DATABASE_ERROR(stmt_, SQL_HANDLE_STMT);
if(rc == SQL_NO_DATA)
return result();
return result(statement, batch_operations);
}
result execute(long batch_operations, long timeout, statement& statement)
{
RETCODE rc;
NANODBC_CALL_RC(
SQLSetStmtAttr
, rc
, stmt_
, SQL_ATTR_PARAMSET_SIZE
, (SQLPOINTER)batch_operations
, 0);
if(!success(rc) && rc != SQL_NO_DATA)
NANODBC_THROW_DATABASE_ERROR(stmt_, SQL_HANDLE_STMT);
this->timeout(timeout);
NANODBC_CALL_RC(SQLExecute, rc, stmt_);
if(!success(rc) && rc != SQL_NO_DATA)
NANODBC_THROW_DATABASE_ERROR(stmt_, SQL_HANDLE_STMT);
if(rc == SQL_NO_DATA)
return result();
return result(statement, batch_operations);
}
long affected_rows() const
{
SQLLEN rows;
RETCODE rc;
NANODBC_CALL_RC(SQLRowCount, rc, stmt_, &rows);
if(!success(rc))
NANODBC_THROW_DATABASE_ERROR(stmt_, SQL_HANDLE_STMT);
return rows;
}
short columns() const
{