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//---------------------------------------------------------------------------------------------------------------------------------
// File: OdbcOperation.cpp
// Contents: Functions called by thread queue for background ODBC operations
//
// Copyright Microsoft Corporation and contributors
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
//
// You may obtain a copy of the License at:
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
//---------------------------------------------------------------------------------------------------------------------------------
#include "stdafx.h"
#include "OdbcOperation.h"
#include "OdbcConnection.h"
#include "node_buffer.h"
#include <limits>
#include <ctime>
#include <sstream>
// undo these tokens to use numeric_limits below
#undef min
#undef max
namespace mssql
{
// default precision and scale for date/time parameters
// (This may be updated for older server since they don't have as high a precision)
const int SQL_SERVER_2008_DEFAULT_DATETIME_PRECISION = 34;
const int SQL_SERVER_2008_DEFAULT_DATETIME_SCALE = 7;
void OdbcOperation::InvokeBackground()
{
failed = !TryInvokeOdbc();
if( failed ) {
failure = connection->LastError();
}
}
void OdbcOperation::CompleteForeground()
{
HandleScope scope;
if (!callback->IsUndefined())
{
int argc;
Local<Value> args[3];
if( failed )
{
Local<Object> err = Local<Object>::Cast( Exception::Error( String::New( failure->Message() )));
err->Set( String::NewSymbol( "sqlstate" ), String::New( failure->SqlState() ));
err->Set( String::NewSymbol( "code" ), Integer::New( failure->Code() ));
args[0] = err;
argc = 1;
}
else
{
args[0] = Local<Value>::New( Boolean::New( false ));
args[1] = Local<Value>::New( CreateCompletionArg() );
argc = 2;
}
//DMGambone: Implementing the fix that clintwood documented
//for issue #62 - Debugging query callback with node-inspector!
//The original line:
// callback->Call(Undefined().As<Object>(), argc, args);
//causes node-inspector to crash if breakpoints are added in any
//query callback function
callback->Call(Context::GetCurrent()->Global(), argc, args);
}
}
bool OpenOperation::TryInvokeOdbc()
{
return connection->TryOpen(connectionString);
}
Handle<Value> OpenOperation::CreateCompletionArg()
{
HandleScope scope;
return scope.Close(backpointer);
}
QueryOperation::QueryOperation(shared_ptr<OdbcConnection> connection, const wstring& query, Handle<Object> callback) :
OdbcOperation(connection, callback),
query(query)
{
}
bool QueryOperation::ParameterErrorToUserCallback( uint32_t param, const char* error )
{
params.clear();
std::stringstream full_error;
full_error << "IMNOD: [msnodesql] Parameter " << param + 1 << ": " << error;
Local<Object> err = Local<Object>::Cast( Exception::Error( String::New( full_error.str().c_str() )));
err->Set( String::NewSymbol( "sqlstate" ), String::New( "IMNOD" ));
err->Set( String::NewSymbol( "code" ), Integer::New( -1 ));
Local<Value> args[1];
args[0] = err;
int argc = 1;
// this is okay because we're still on the node.js thread, not on the background thread
callback->Call(Context::GetCurrent()->Global(), argc, args);
return false;
}
bool QueryOperation::BindParameters( Handle<Array> node_params )
{
uint32_t count = node_params->Length();
if( count > 0 ) {
for( uint32_t i = 0; i < count; ++i ) {
Local<Value> p = node_params->Get( i );
ParamBinding binding;
if( p->IsNull() ) {
binding.js_type = ParamBinding::JS_NULL;
binding.c_type = SQL_C_CHAR;
binding.sql_type = SQL_CHAR;
binding.param_size = 1;
binding.digits = 0;
binding.buffer = NULL;
binding.buffer_len = 0;
binding.indptr = SQL_NULL_DATA;
}
else if( p->IsString() ) {
binding.js_type = ParamBinding::JS_STRING;
binding.c_type = SQL_C_WCHAR;
binding.sql_type = SQL_WVARCHAR;
Local<String> str_param = p->ToString();
int str_len = str_param->Length();
binding.buffer = new uint16_t[ str_len + 1 ]; // null terminator
str_param->Write( static_cast<uint16_t*>( binding.buffer ));
if( str_len > 4000 ) {
binding.param_size = 0; // max types require 0 precision
}
else {
binding.param_size = str_len;
}
binding.buffer_len = str_len * sizeof( uint16_t );
binding.digits = 0;
binding.indptr = binding.buffer_len;
}
else if( p->IsBoolean() ) {
binding.js_type = ParamBinding::JS_BOOLEAN;
binding.c_type = SQL_C_BIT;
binding.sql_type = SQL_BIT;
binding.buffer = new uint16_t;
binding.buffer_len = sizeof( uint16_t );
*static_cast<uint16_t*>( binding.buffer ) = p->BooleanValue();
binding.param_size = 1;
binding.digits = 0;
binding.indptr = binding.buffer_len;
}
else if( p->IsInt32()) {
binding.js_type = ParamBinding::JS_INT;
binding.c_type = SQL_C_SLONG;
binding.sql_type = SQL_INTEGER;
binding.buffer = new int32_t;
binding.buffer_len = sizeof( int32_t );
*static_cast<int32_t*>( binding.buffer ) = p->Int32Value();
binding.param_size = sizeof( int32_t );
binding.digits = 0;
binding.indptr = binding.buffer_len;
}
else if( p->IsUint32()) {
binding.js_type = ParamBinding::JS_UINT;
binding.c_type = SQL_C_ULONG;
binding.sql_type = SQL_BIGINT;
binding.buffer = new uint32_t;
binding.buffer_len = sizeof( uint32_t );
*static_cast<int32_t*>( binding.buffer ) = p->Uint32Value();
binding.param_size = sizeof( uint32_t );
binding.digits = 0;
binding.indptr = binding.buffer_len;
}
else if( p->IsNumber()) {
// numbers can be either integers or doubles. We attempt to determine which it is through a simple
// cast and equality check
double d = p->NumberValue();
if( _isnan( d ) || !_finite( d ) ) {
return ParameterErrorToUserCallback( i, "Invalid number parameter" );
}
else if( d == floor( d ) &&
d >= std::numeric_limits<int64_t>::min() &&
d <= std::numeric_limits<int64_t>::max() ) {
binding.js_type = ParamBinding::JS_NUMBER;
binding.c_type = SQL_C_SBIGINT;
binding.sql_type = SQL_BIGINT;
binding.buffer = new int64_t;
binding.buffer_len = sizeof( int64_t );
*static_cast<int64_t*>( binding.buffer ) = p->IntegerValue();
binding.param_size = sizeof( int64_t );
binding.digits = 0;
binding.indptr = binding.buffer_len;
}
else {
binding.js_type = ParamBinding::JS_NUMBER;
binding.c_type = SQL_C_DOUBLE;
binding.sql_type = SQL_DOUBLE;
binding.buffer = new double;
binding.buffer_len = sizeof( double );
*static_cast<double*>( binding.buffer ) = p->NumberValue();
binding.param_size = sizeof( double );
binding.digits = 0;
binding.indptr = binding.buffer_len;
}
}
else if( p->IsDate() ) {
// Since JS dates have no timezone context, all dates are assumed to be UTC
Handle<Date> dateObject = Handle<Date>::Cast<Value>( p );
assert( !dateObject.IsEmpty() );
// dates in JS are stored internally as ms count from Jan 1, 1970
double d = dateObject->NumberValue();
SQL_SS_TIMESTAMPOFFSET_STRUCT* sql_tm = new SQL_SS_TIMESTAMPOFFSET_STRUCT;
TimestampColumn sql_date( d );
sql_date.ToTimestampOffset( *sql_tm );
binding.js_type = ParamBinding::JS_DATE;
binding.c_type = SQL_C_BINARY;
// TODO: Determine proper SQL type based on version of server we're talking to
binding.sql_type = SQL_SS_TIMESTAMPOFFSET;
binding.buffer = sql_tm;
binding.buffer_len = sizeof( SQL_SS_TIMESTAMPOFFSET_STRUCT );
// TODO: Determine proper precision and size based on version of server we're talking to
binding.param_size = SQL_SERVER_2008_DEFAULT_DATETIME_PRECISION;
binding.digits = SQL_SERVER_2008_DEFAULT_DATETIME_SCALE;
binding.indptr = binding.buffer_len;
}
else if( p->IsObject() && node::Buffer::HasInstance( p )) {
// TODO: Determine if we need something to keep the Buffer object from going
// away while we use it we could just copy the data, but with buffers being
// potentially very large, that could be problematic
Local<Object> o = p.As<Object>();
binding.js_type = ParamBinding::JS_BUFFER;
binding.c_type = SQL_C_BINARY;
binding.sql_type = SQL_VARBINARY;
binding.buffer = node::Buffer::Data( o );
binding.buffer_len = node::Buffer::Length( o );
binding.param_size = binding.buffer_len;
binding.digits = 0;
binding.indptr = binding.buffer_len;
}
else {
return ParameterErrorToUserCallback( i, "Invalid parameter type" );
}
params.push_back( move( binding ));
}
}
return true;
}
bool QueryOperation::TryInvokeOdbc()
{
return connection->TryExecute( query, params );
}
Handle<Value> QueryOperation::CreateCompletionArg()
{
HandleScope scope;
return scope.Close(connection->GetMetaValue());
}
bool ReadRowOperation::TryInvokeOdbc()
{
return connection->TryReadRow();
}
Handle<Value> ReadRowOperation::CreateCompletionArg()
{
HandleScope scope;
return scope.Close(connection->EndOfRows());
}
bool ReadColumnOperation::TryInvokeOdbc()
{
return connection->TryReadColumn(column);
}
Handle<Value> ReadColumnOperation::CreateCompletionArg()
{
HandleScope scope;
return scope.Close(connection->GetColumnValue());
}
bool ReadNextResultOperation::TryInvokeOdbc()
{
return connection->TryReadNextResult();
}
Handle<Value> ReadNextResultOperation::CreateCompletionArg()
{
HandleScope scope;
Local<Object> more_meta = Object::New();
more_meta->Set( String::NewSymbol( "endOfResults" ), connection->EndOfResults() );
more_meta->Set( String::NewSymbol( "meta" ), connection->GetMetaValue() );
return scope.Close( more_meta );
}
bool CloseOperation::TryInvokeOdbc()
{
return connection->TryClose();
}
Handle<Value> CloseOperation::CreateCompletionArg()
{
HandleScope scope;
return scope.Close( Undefined() );
}
bool CollectOperation::TryInvokeOdbc()
{
return connection->TryClose();
}
Handle<Value> CollectOperation::CreateCompletionArg()
{
assert( false );
HandleScope scope;
return scope.Close( Undefined() );
}
// override to not call a callback
void CollectOperation::CompleteForeground()
{
}
bool BeginTranOperation::TryInvokeOdbc()
{
return connection->TryBeginTran();
}
Handle<Value> BeginTranOperation::CreateCompletionArg()
{
HandleScope scope;
return scope.Close( Undefined() );
}
bool EndTranOperation::TryInvokeOdbc()
{
return connection->TryEndTran(completionType);
}
Handle<Value> EndTranOperation::CreateCompletionArg()
{
HandleScope scope;
return scope.Close( Undefined() );
}
}
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