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odbc_connection.cpp
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/*
Copyright (c) 2019, 2021 IBM
Copyright (c) 2013, Dan VerWeire <[email protected]>
Copyright (c) 2010, Lee Smith<[email protected]>
Permission to use, copy, modify, and/or distribute this software for any
purpose with or without fee is hereby granted, provided that the above
copyright notice and this permission notice appear in all copies.
THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
*/
#include "odbc.h"
#include "odbc_connection.h"
#include "odbc_statement.h"
#include "odbc_cursor.h"
#define MAX_UTF8_BYTES 4
// object keys for the result object
const char* NAME = "name";
const char* DATA_TYPE = "dataType";
const char* DATA_TYPE_NAME = "dataTypeName";
const char* COLUMN_SIZE = "columnSize";
const char* DECIMAL_DIGITS = "decimalDigits";
const char* NULLABLE = "nullable";
const char* STATEMENT = "statement";
const char* PARAMETERS = "parameters";
const char* RETURN = "return";
const char* COUNT = "count";
const char* COLUMNS = "columns";
Napi::FunctionReference ODBCConnection::constructor;
Napi::Object ODBCConnection::Init(Napi::Env env, Napi::Object exports) {
Napi::HandleScope scope(env);
Napi::Function constructorFunction = DefineClass(env, "ODBCConnection", {
InstanceMethod("close", &ODBCConnection::Close),
InstanceMethod("createStatement", &ODBCConnection::CreateStatement),
InstanceMethod("query", &ODBCConnection::Query),
InstanceMethod("beginTransaction", &ODBCConnection::BeginTransaction),
InstanceMethod("commit", &ODBCConnection::Commit),
InstanceMethod("rollback", &ODBCConnection::Rollback),
InstanceMethod("callProcedure", &ODBCConnection::CallProcedure),
InstanceMethod("getUsername", &ODBCConnection::GetUsername),
InstanceMethod("primaryKeys", &ODBCConnection::PrimaryKeys),
InstanceMethod("foreignKeys", &ODBCConnection::ForeignKeys),
InstanceMethod("tables", &ODBCConnection::Tables),
InstanceMethod("columns", &ODBCConnection::Columns),
InstanceMethod("setIsolationLevel", &ODBCConnection::SetIsolationLevel),
InstanceAccessor("connected", &ODBCConnection::ConnectedGetter, nullptr),
InstanceAccessor("autocommit", &ODBCConnection::AutocommitGetter, nullptr),
InstanceAccessor("connectionTimeout", &ODBCConnection::ConnectionTimeoutGetter, nullptr),
InstanceAccessor("loginTimeout", &ODBCConnection::LoginTimeoutGetter, nullptr)
});
constructor = Napi::Persistent(constructorFunction);
constructor.SuppressDestruct();
return exports;
}
/******************************************************************************
**************************** SET ISOLATION LEVEL *****************************
*****************************************************************************/
// CloseAsyncWorker, used by Close function (see below)
class SetIsolationLevelAsyncWorker : public ODBCAsyncWorker {
public:
SetIsolationLevelAsyncWorker(ODBCConnection *odbcConnectionObject, SQLUINTEGER isolationLevel, Napi::Function& callback) : ODBCAsyncWorker(callback),
odbcConnectionObject(odbcConnectionObject),
isolationLevel(isolationLevel){}
~SetIsolationLevelAsyncWorker() {}
private:
ODBCConnection *odbcConnectionObject;
SQLUINTEGER isolationLevel;
void Execute() {
SQLRETURN return_code;
return_code = SQLSetConnectAttr(
odbcConnectionObject->hDBC, // ConnectionHandle
SQL_ATTR_TXN_ISOLATION, // Attribute
(SQLPOINTER) (uintptr_t) isolationLevel, // ValuePtr
SQL_NTS // StringLength
);
if (!SQL_SUCCEEDED(return_code)) {
this->errors = GetODBCErrors(SQL_HANDLE_DBC, odbcConnectionObject->hDBC);
SetError("[odbc] Error setting isolation level\0");
return;
}
}
void OnOK() {
Napi::Env env = Env();
Napi::HandleScope scope(env);
std::vector<napi_value> callbackArguments;
callbackArguments.push_back(env.Null());
Callback().Call(callbackArguments);
}
};
Napi::Value ODBCConnection::SetIsolationLevel(const Napi::CallbackInfo &info) {
Napi::Env env = info.Env();
Napi::HandleScope scope(env);
SQLUINTEGER isolationLevel = info[0].As<Napi::Number>().Uint32Value();
Napi::Function callback = info[1].As<Napi::Function>();
if (!(isolationLevel & this->getInfoResults.available_isolation_levels)) {
std::vector<napi_value> callbackArguments;
callbackArguments.push_back(Napi::Error::New(env, "Isolation level passed to setIsolationLevel is not valid for the connection!").Value());
callback.Call(callbackArguments);
}
SetIsolationLevelAsyncWorker *worker = new SetIsolationLevelAsyncWorker(this, isolationLevel, callback);
worker->Queue();
return env.Undefined();
}
Napi::Value ODBCConnection::AutocommitGetter(const Napi::CallbackInfo& info) {
Napi::Env env = info.Env();
Napi::HandleScope scope(env);
SQLINTEGER autocommit;
SQLGetConnectAttr(
this->hDBC, // ConnectionHandle
SQL_ATTR_AUTOCOMMIT, // Attribute
&autocommit, // ValuePtr
0, // BufferLength
NULL // StringLengthPtr
);
if (autocommit == SQL_AUTOCOMMIT_OFF) {
return Napi::Boolean::New(env, false);
} else if (autocommit == SQL_AUTOCOMMIT_ON) {
return Napi::Boolean::New(env, true);
}
return Napi::Boolean::New(env, false);
}
ODBCConnection::ODBCConnection(const Napi::CallbackInfo& info) : Napi::ObjectWrap<ODBCConnection>(info) {
this->hENV = *(info[0].As<Napi::External<SQLHENV>>().Data());
this->hDBC = *(info[1].As<Napi::External<SQLHDBC>>().Data());
this->connectionOptions = *(info[2].As<Napi::External<ConnectionOptions>>().Data());
this->getInfoResults = *(info[3].As<Napi::External<GetInfoResults>>().Data());
}
ODBCConnection::~ODBCConnection()
{
this->Free();
}
SQLRETURN ODBCConnection::Free() {
SQLRETURN return_code = SQL_SUCCESS;
if (this->hDBC != SQL_NULL_HANDLE)
{
{
uv_mutex_lock(&ODBC::g_odbcMutex);
return_code =
SQLFreeHandle
(
SQL_HANDLE_DBC,
this->hDBC
);
this->hDBC = SQL_NULL_HANDLE;
uv_mutex_unlock(&ODBC::g_odbcMutex);
}
}
return return_code;
}
Napi::Value ODBCConnection::ConnectedGetter(const Napi::CallbackInfo& info) {
Napi::Env env = info.Env();
Napi::HandleScope scope(env);
SQLINTEGER connection = SQL_CD_TRUE;
SQLGetConnectAttr(
this->hDBC, // ConnectionHandle
SQL_ATTR_CONNECTION_DEAD, // Attribute
&connection, // ValuePtr
0, // BufferLength
NULL // StringLengthPtr
);
if (connection == SQL_CD_FALSE) { // connection dead is false
return Napi::Boolean::New(env, true);
}
return Napi::Boolean::New(env, false);
}
Napi::Value ODBCConnection::ConnectionTimeoutGetter(const Napi::CallbackInfo& info)
{
Napi::Env env = info.Env();
Napi::HandleScope scope(env);
return Napi::Number::New(env, this->connectionOptions.connectionTimeout);
}
Napi::Value ODBCConnection::LoginTimeoutGetter(const Napi::CallbackInfo& info)
{
Napi::Env env = info.Env();
Napi::HandleScope scope(env);
return Napi::Number::New(env, this->connectionOptions.loginTimeout);
}
/******************************************************************************
********************************** CLOSE *************************************
*****************************************************************************/
// CloseAsyncWorker, used by Close function (see below)
class CloseAsyncWorker : public ODBCAsyncWorker {
public:
CloseAsyncWorker(ODBCConnection *odbcConnectionObject, Napi::Function& callback) : ODBCAsyncWorker(callback),
odbcConnectionObject(odbcConnectionObject) {}
~CloseAsyncWorker() {}
private:
ODBCConnection *odbcConnectionObject;
void Execute() {
SQLRETURN return_code;
uv_mutex_lock(&ODBC::g_odbcMutex);
// When closing, make sure any transactions are closed as well. Because we don't know whether
// we should commit or rollback, so we default to rollback.
if (odbcConnectionObject->hDBC != SQL_NULL_HANDLE) {
return_code = SQLEndTran(
SQL_HANDLE_DBC, // HandleType
odbcConnectionObject->hDBC, // Handle
SQL_ROLLBACK // CompletionType
);
if (!SQL_SUCCEEDED(return_code)) {
uv_mutex_unlock(&ODBC::g_odbcMutex);
this->errors = GetODBCErrors(SQL_HANDLE_DBC, odbcConnectionObject->hDBC);
SetError("[odbc] Error ending potential transactions when closing the connection\0");
return;
}
return_code = SQLDisconnect(
odbcConnectionObject->hDBC // ConnectionHandle
);
if (!SQL_SUCCEEDED(return_code)) {
uv_mutex_unlock(&ODBC::g_odbcMutex);
this->errors = GetODBCErrors(SQL_HANDLE_DBC, odbcConnectionObject->hDBC);
SetError("[odbc] Error disconnecting when closing the connection\0");
return;
}
return_code = SQLFreeHandle(
SQL_HANDLE_DBC, // HandleType
odbcConnectionObject->hDBC // Handle
);
if (!SQL_SUCCEEDED(return_code)) {
uv_mutex_unlock(&ODBC::g_odbcMutex);
this->errors = GetODBCErrors(SQL_HANDLE_DBC, odbcConnectionObject->hDBC);
SetError("[odbc] Error freeing connection handle when closing the connection\0");
return;
}
odbcConnectionObject->hDBC = SQL_NULL_HANDLE;
}
uv_mutex_unlock(&ODBC::g_odbcMutex);
}
void OnOK() {
Napi::Env env = Env();
Napi::HandleScope scope(env);
std::vector<napi_value> callbackArguments;
callbackArguments.push_back(env.Null());
Callback().Call(callbackArguments);
}
};
/*
* ODBCConnection::Close (Async)
*
* Description: Closes the connection asynchronously.
*
* Parameters:
*
* const Napi::CallbackInfo& info:
* The information passed by Napi from the JavaScript call, including
* arguments from the JavaScript function.
*
* info[0]: Function: callback function, in the following format:
* function(error)
* error: An error object if the connection was not closed, or
* null if operation was successful.
*
* Return:
* Napi::Value:
* Undefined. (The return values are attached to the callback function).
*/
Napi::Value ODBCConnection::Close(const Napi::CallbackInfo& info) {
Napi::Env env = info.Env();
Napi::HandleScope scope(env);
Napi::Function callback = info[0].As<Napi::Function>();
CloseAsyncWorker *worker = new CloseAsyncWorker(this, callback);
worker->Queue();
return env.Undefined();
}
/******************************************************************************
***************************** CREATE STATEMENT *******************************
*****************************************************************************/
// CreateStatementAsyncWorker, used by CreateStatement function (see below)
class CreateStatementAsyncWorker : public ODBCAsyncWorker {
private:
ODBCConnection *odbcConnectionObject;
HSTMT hstmt;
void Execute() {
SQLRETURN return_code;
uv_mutex_lock(&ODBC::g_odbcMutex);
return_code =
SQLAllocHandle
(
SQL_HANDLE_STMT, // HandleType
odbcConnectionObject->hDBC, // InputHandle
&hstmt // OutputHandlePtr
);
uv_mutex_unlock(&ODBC::g_odbcMutex);
if (!SQL_SUCCEEDED(return_code)) {
this->errors = GetODBCErrors(SQL_HANDLE_STMT, hstmt);
SetError("[odbc] Error allocating a handle to create a new Statement\0");
return;
}
}
void OnOK() {
Napi::Env env = Env();
Napi::HandleScope scope(env);
// arguments for the ODBCStatement constructor
std::vector<napi_value> statementArguments;
statementArguments.push_back(Napi::External<ODBCConnection>::New(env, odbcConnectionObject));
statementArguments.push_back(Napi::External<HSTMT>::New(env, &hstmt));
// create a new ODBCStatement object as a Napi::Value
Napi::Value statementObject = ODBCStatement::constructor.New(statementArguments);
std::vector<napi_value> callbackArguments;
callbackArguments.push_back(env.Null()); // callbackArguments[0]
callbackArguments.push_back(statementObject); // callbackArguments[1]
Callback().Call(callbackArguments);
}
public:
CreateStatementAsyncWorker(ODBCConnection *odbcConnectionObject, Napi::Function& callback) : ODBCAsyncWorker(callback),
odbcConnectionObject(odbcConnectionObject) {}
~CreateStatementAsyncWorker() {}
};
/*
* ODBCConnection::CreateStatement
*
* Description: Create an ODBCStatement to manually prepare, bind, and
* execute.
*
* Parameters:
* const Napi::CallbackInfo& info:
* The information passed from the JavaSript environment, including the
* function arguments for 'endTransactionSync'.
*
* info[0]: Function: callback function:
* function(error, statement)
* error: An error object if there was an error creating the
* statement, or null if operation was successful.
* statement: The newly created ODBCStatement object
*
* Return:
* Napi::Value:
* Undefined (results returned in callback)
*/
Napi::Value ODBCConnection::CreateStatement(const Napi::CallbackInfo& info) {
Napi::Env env = info.Env();
Napi::HandleScope scope(env);
Napi::Function callback = info[0].As<Napi::Function>();
CreateStatementAsyncWorker *worker = new CreateStatementAsyncWorker(this, callback);
worker->Queue();
return env.Undefined();
}
/******************************************************************************
********************************** QUERY *************************************
*****************************************************************************/
Napi::Value
parse_query_options
(
Napi::Env env,
Napi::Value options_value,
QueryOptions *query_options
)
{
query_options->reset();
if (options_value.IsNull())
{
return env.Null();
}
Napi::Object options_object = options_value.As<Napi::Object>();
// .cursor property
if (options_object.HasOwnProperty(QueryOptions::CURSOR_PROPERTY))
{
Napi::Value cursor_value =
options_object.Get(QueryOptions::CURSOR_PROPERTY);
if (!(cursor_value.IsString() || cursor_value.IsBoolean()))
{
return Napi::TypeError::New(env, std::string("Connection.query options: .") + QueryOptions::CURSOR_PROPERTY + " must be a STRING or BOOLEAN value.").Value();
}
if (cursor_value.IsString())
{
query_options->use_cursor = true;
#ifdef UNICODE
std::u16string cursor_string;
cursor_string = cursor_value.As<Napi::String>().Utf16Value();
#else
std::string cursor_string;
cursor_string = cursor_value.As<Napi::String>().Utf8Value();
#endif
query_options->cursor_name = (SQLTCHAR *)cursor_string.c_str();
query_options->cursor_name_length = cursor_string.length();
}
else if (cursor_value.IsBoolean())
{
query_options->use_cursor = cursor_value.As<Napi::Boolean>().Value();
query_options->cursor_name = NULL;
}
}
// END .cursor property
// .fetchSize property
if (options_object.HasOwnProperty(QueryOptions::FETCH_SIZE_PROPERTY))
{
Napi::Value fetch_size_value =
options_object.Get(QueryOptions::FETCH_SIZE_PROPERTY);
if (!fetch_size_value.IsNumber())
{
return Napi::TypeError::New(env, std::string("Connection.query options: .") + QueryOptions::FETCH_SIZE_PROPERTY + " must be a NUMBER value.").Value();
}
int64_t temp_value = fetch_size_value.As<Napi::Number>().Int64Value();
if (temp_value < 1)
{
return Napi::RangeError::New(env, std::string("Connection.query options: .") + QueryOptions::FETCH_SIZE_PROPERTY + " must be greater than 0.").Value();
}
// even if the user didn't explicitly set use_cursor to true, if they are
// passing a fetch size, it should be assumed.
query_options->use_cursor = true;
query_options->fetch_size = (SQLULEN) temp_value;
}
// END .fetchSize property
// .timeout property
if (options_object.HasOwnProperty(QueryOptions::TIMEOUT_PROPERTY))
{
Napi::Value timeout_value =
options_object.Get(QueryOptions::TIMEOUT_PROPERTY);
if (!timeout_value.IsNumber())
{
return Napi::TypeError::New(env, std::string("Connection.query options: .") + QueryOptions::TIMEOUT_PROPERTY + " must be a NUMBER value.").Value();
}
int64_t temp_value = timeout_value.As<Napi::Number>().Int64Value();
if (temp_value < 1)
{
return Napi::RangeError::New(env, std::string("Connection.query options: .") + QueryOptions::TIMEOUT_PROPERTY + " must be greater than 0.").Value();
}
query_options->timeout = (SQLULEN) temp_value;
}
// END .timeout property
// .initialBufferSize property
if (options_object.HasOwnProperty(QueryOptions::INITIAL_BUFFER_SIZE_PROPERTY))
{
Napi::Value initial_long_data_buffer_size_value =
options_object.Get(QueryOptions::INITIAL_BUFFER_SIZE_PROPERTY);
if (!initial_long_data_buffer_size_value.IsNumber())
{
return Napi::TypeError::New(env, std::string("Connection.query options: .") + QueryOptions::INITIAL_BUFFER_SIZE_PROPERTY + " must be a NUMBER value.").Value();
}
int64_t temp_value = initial_long_data_buffer_size_value.As<Napi::Number>().Int64Value();
if (temp_value < 1)
{
return Napi::RangeError::New(env, std::string("Connection.query options: .") + QueryOptions::INITIAL_BUFFER_SIZE_PROPERTY + " must be greater than 0.").Value();
}
query_options->initial_long_data_buffer_size = (SQLLEN) temp_value;
}
// END .initialBufferSize
return env.Null();
}
SQLRETURN
set_fetch_size
(
StatementData *data,
SQLULEN fetch_size
)
{
SQLRETURN return_code;
return_code =
SQLSetStmtAttr
(
data->hstmt,
SQL_ATTR_ROW_ARRAY_SIZE,
(SQLPOINTER) fetch_size,
0
);
data->fetch_size = fetch_size;
if (!SQL_SUCCEEDED(return_code))
{
// Some drivers don't feel the need to implement the
// SQL_ATTR_ROW_ARRAY_SIZE option for SQLSetStmtAttr, so this call will
// return an error. Instead of returning an error, first check that the
// fetch size wasn't set to something bigger than 1, then continue. If the
// user set the fetch size, then throw an error to let them know that they
// should rerun with a fetch size of 1.
if (fetch_size != 1)
{
// The user set a fetch size, but their driver doesn't support this call.
return return_code;
}
SQLRETURN diagnostic_return_code;
SQLSMALLINT textLength;
SQLTCHAR errorSQLState[SQL_SQLSTATE_SIZE + 1];
SQLINTEGER nativeError;
SQLTCHAR errorMessage[ERROR_MESSAGE_BUFFER_BYTES];
diagnostic_return_code =
SQLGetDiagRec
(
SQL_HANDLE_STMT, // HandleType
data->hstmt, // Handle
1, // RecNumber
errorSQLState, // SQLState
&nativeError, // NativeErrorPtr
errorMessage, // MessageText
ERROR_MESSAGE_BUFFER_CHARS, // BufferLength
&textLength // TextLengthPtr
);
if (!SQL_SUCCEEDED(diagnostic_return_code))
{
return return_code;
}
// HY092 is the SQLState produced by drivers that are known to not implement
// SQL_ATTR_ROW_ARRAY_SIZE. Set that return code to SQL_SUCCESS, since fetch
// size was 1 anyways. We will set simple_binding below
if (strcmp("HY092", (const char*)errorSQLState) == 0)
{
return_code = SQL_SUCCESS;
}
return return_code;
}
// SQLSetStmtAttr with option SQL_ATTR_ROW_ARRAY_SIZE can reutrn SQLSTATE of
// 01S02, indicating that "The driver did not support the value specified ...
// so the driver substituted a similar value". If return code is
// SQL_SUCCESS_WITH_INFO, check if the SQLSTATE is 01S02, and then get the
// substituted value to store. We don't save off any other warnings, just
// check for that particular SQLSTATE.
if (return_code == SQL_SUCCESS_WITH_INFO)
{
SQLRETURN diagnostic_return_code;
SQLSMALLINT textLength;
SQLINTEGER statusRecCount;
SQLTCHAR errorSQLState[SQL_SQLSTATE_SIZE + 1];
SQLINTEGER nativeError;
SQLTCHAR errorMessage[ERROR_MESSAGE_BUFFER_BYTES];
diagnostic_return_code =
SQLGetDiagField (
SQL_HANDLE_STMT, // HandleType
data->hstmt, // Handle
0, // RecNumber
SQL_DIAG_NUMBER, // DiagIdentifier
&statusRecCount, // DiagInfoPtr
SQL_IS_INTEGER, // BufferLength
NULL // StringLengthPtr
);
for (SQLSMALLINT i = 0; i < statusRecCount; i++) {
diagnostic_return_code =
SQLGetDiagRec
(
SQL_HANDLE_STMT, // HandleType
data->hstmt, // Handle
i + 1, // RecNumber
errorSQLState, // SQLState
&nativeError, // NativeErrorPtr
errorMessage, // MessageText
ERROR_MESSAGE_BUFFER_CHARS, // BufferLength
&textLength // TextLengthPtr
);
if (SQL_SUCCEEDED(diagnostic_return_code))
{
if (strcmp("01S02", (const char*)errorSQLState) == 0)
{
// We found the SQLSTATE we were looking for, need to get the
// driver-substituted vaue
return_code =
SQLGetStmtAttr
(
data->hstmt,
SQL_ATTR_ROW_ARRAY_SIZE,
(SQLPOINTER) &data->fetch_size,
SQL_IS_INTEGER,
IGNORED_PARAMETER
);
if (!SQL_SUCCEEDED(return_code))
{
return return_code;
}
}
} else {
return return_code;
}
}
}
data->row_status_array =
new SQLUSMALLINT[fetch_size]();
return_code =
SQLSetStmtAttr
(
data->hstmt,
SQL_ATTR_ROW_STATUS_PTR,
(SQLPOINTER) data->row_status_array,
0
);
return return_code;
}
// QueryAsyncWorker, used by Query function (see below)
class QueryAsyncWorker : public ODBCAsyncWorker {
private:
ODBCConnection *odbcConnectionObject;
Napi::Reference<Napi::Array> napiParameters;
StatementData *data;
void Execute() {
SQLRETURN return_code;
// allocate a new statement handle
uv_mutex_lock(&ODBC::g_odbcMutex);
if (odbcConnectionObject->hDBC == SQL_NULL_HANDLE) {
uv_mutex_unlock(&ODBC::g_odbcMutex);
SetError("[odbc] Database connection handle was no longer valid. Cannot run a query after closing the connection.");
return;
} else {
return_code = SQLAllocHandle(
SQL_HANDLE_STMT, // HandleType
odbcConnectionObject->hDBC, // InputHandle
&(data->hstmt) // OutputHandlePtr
);
uv_mutex_unlock(&ODBC::g_odbcMutex);
if (!SQL_SUCCEEDED(return_code)) {
this->errors = GetODBCErrors(SQL_HANDLE_DBC, odbcConnectionObject->hDBC);
SetError("[odbc] Error allocating a handle to run the SQL statement\0");
return;
}
// set SQL_ATTR_QUERY_TIMEOUT
if (data->query_options.timeout > 0) {
return_code =
SQLSetStmtAttr
(
data->hstmt,
SQL_ATTR_QUERY_TIMEOUT,
(SQLPOINTER) data->query_options.timeout,
IGNORED_PARAMETER
);
// It is possible that SQLSetStmtAttr returns a warning with SQLSTATE
// 01S02, indicating that the driver changed the value specified.
// Although we never use the timeout variable again (and so we don't
// REALLY need it to be correct in the code), its just good to have
// the correct value if we need it.
if (return_code == SQL_SUCCESS_WITH_INFO)
{
return_code =
SQLGetStmtAttr
(
data->hstmt,
SQL_ATTR_QUERY_TIMEOUT,
(SQLPOINTER) &data->query_options.timeout,
SQL_IS_UINTEGER,
IGNORED_PARAMETER
);
}
// Both of the SQL_ATTR_QUERY_TIMEOUT calls are combined here
if (!SQL_SUCCEEDED(return_code)) {
this->errors = GetODBCErrors(SQL_HANDLE_STMT, data->hstmt);
SetError("[odbc] Error setting the query timeout on the statement\0");
return;
}
}
// querying with parameters, need to prepare, bind, execute
if (data->parameterCount > 0) {
// binds all parameters to the query
return_code =
SQLPrepare
(
data->hstmt,
data->sql,
SQL_NTS
);
if (!SQL_SUCCEEDED(return_code)) {
this->errors = GetODBCErrors(SQL_HANDLE_STMT, data->hstmt);
SetError("[odbc] Error preparing the SQL statement\0");
return;
}
SQLSMALLINT parameterMarkerCount;
return_code =
SQLNumParams
(
data->hstmt,
¶meterMarkerCount
);
if (!SQL_SUCCEEDED(return_code)) {
this->errors = GetODBCErrors(SQL_HANDLE_STMT, data->hstmt);
SetError("[odbc] Error getting information about the number of parameter markers in the statment\0");
return;
}
if (parameterMarkerCount != data->parameterCount) {
SetError("[odbc] The number of parameter markers in the statement does not equal the number of bind values passed to the function.");
return;
}
return_code = ODBC::DescribeParameters(data->hstmt, data->parameters, data->parameterCount);
if (!SQL_SUCCEEDED(return_code)) {
this->errors = GetODBCErrors(SQL_HANDLE_STMT, data->hstmt);
SetError("[odbc] Error getting information about parameters\0");
return;
}
return_code = ODBC::BindParameters(data->hstmt, data->parameters, data->parameterCount);
if (!SQL_SUCCEEDED(return_code)) {
this->errors = GetODBCErrors(SQL_HANDLE_STMT, data->hstmt);
SetError("[odbc] Error binding parameters\0");
return;
}
return_code = SQLExecute(data->hstmt);
if (!SQL_SUCCEEDED(return_code) && return_code != SQL_NO_DATA) {
this->errors = GetODBCErrors(SQL_HANDLE_STMT, data->hstmt);
SetError("[odbc] Error executing the sql statement\0");
return;
}
}
// querying without parameters, can just use SQLExecDirect
else {
return_code =
SQLExecDirect
(
data->hstmt,
data->sql,
SQL_NTS
);
if (!SQL_SUCCEEDED(return_code) && return_code != SQL_NO_DATA) {
this->errors = GetODBCErrors(SQL_HANDLE_STMT, data->hstmt);
SetError("[odbc] Error executing the sql statement\0");
return;
}
}
if (return_code != SQL_NO_DATA) {
if (data->query_options.use_cursor)
{
if (data->query_options.cursor_name != NULL)
{
return_code =
SQLSetCursorName
(
data->hstmt,
data->query_options.cursor_name,
data->query_options.cursor_name_length
);
if (!SQL_SUCCEEDED(return_code)) {
this->errors = GetODBCErrors(SQL_HANDLE_STMT, data->hstmt);
SetError("[odbc] Error setting the cursor name on the statement\0");
return;
}
}
}
return_code =
set_fetch_size
(
data,
data->query_options.fetch_size
);
// set_fetch_size will swallow errors in the case that the driver
// doesn't implement SQL_ATTR_ROW_ARRAY_SIZE for SQLSetStmtAttr and
// the fetch size was 1. If the fetch size was set by the user to a
// value greater than 1, throw an error.
if (!SQL_SUCCEEDED(return_code)) {
this->errors = GetODBCErrors(SQL_HANDLE_STMT, data->hstmt);
SetError("[odbc] Error setting the fetch size on the statement\0");
return;
}
return_code =
prepare_for_fetch
(
data
);
if (!SQL_SUCCEEDED(return_code)) {
this->errors = GetODBCErrors(SQL_HANDLE_STMT, data->hstmt);
SetError("[odbc] Error preparing for fetch\0");
return;
}
if (!data->query_options.use_cursor)
{
bool alloc_error = false;
return_code =
fetch_all_and_store
(
data,
true,
&alloc_error
);
if (alloc_error)
{
SetError("[odbc] Error allocating or reallocating memory when fetching data. No ODBC error information available.\0");
return;
}
if (!SQL_SUCCEEDED(return_code)) {
this->errors = GetODBCErrors(SQL_HANDLE_STMT, data->hstmt);
SetError("[odbc] Error retrieving the result set from the statement\0");
return;
}
}
}
}
}
void OnOK() {
Napi::Env env = Env();
Napi::HandleScope scope(env);
std::vector<napi_value> callbackArguments;
if (data->query_options.use_cursor)
{
// arguments for the ODBCCursor constructor
std::vector<napi_value> cursor_arguments =
{
Napi::External<StatementData>::New(env, data),
Napi::External<ODBCConnection>::New(env, odbcConnectionObject),
napiParameters.Value(),
Napi::Boolean::New(env, true)
};
// create a new ODBCCursor object as a Napi::Value
Napi::Value cursorObject = ODBCCursor::constructor.New(cursor_arguments);
// return cursor
std::vector<napi_value> callbackArguments =
{
env.Null(),
cursorObject
};
Callback().Call(callbackArguments);
}
else
{
Napi::Array rows = process_data_for_napi(env, data, napiParameters.Value());
std::vector<napi_value> callbackArguments =
{
env.Null(),
rows
};
// return results
Callback().Call(callbackArguments);
}
return;
}
public:
QueryAsyncWorker
(
ODBCConnection *odbcConnectionObject,
Napi::Array napiParameterArray,
StatementData *data,
Napi::Function& callback
)
:
ODBCAsyncWorker(callback),
odbcConnectionObject(odbcConnectionObject),
data(data)
{
napiParameters = Napi::Persistent(napiParameterArray.As<Napi::Array>());
}
~QueryAsyncWorker() {
if (!data->query_options.use_cursor)
{
uv_mutex_lock(&ODBC::g_odbcMutex);
// It is possible the connection handle has been freed, which freed the
// statement handle as well. Freeing again would cause a segfault.
if (this->odbcConnectionObject->hDBC != SQL_NULL_HANDLE) {