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ldblink.cpp
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ldblink.cpp
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// vim:ru:scs:si:sm:sw=4:sta:ts=4:tw=0
// (c) Copyright [2022-2023] Micro Focus or one of its affiliates.
// 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 "Vertica.h"
#include "StringParsers.h"
using namespace Vertica;
using namespace std;
#include <sql.h>
#include <time.h>
#include <sqlext.h>
#include <iostream>
#include <fstream>
#define DBLINK_CIDS "/usr/local/etc/dblink.cids" // Default Connection identifiers config file FIX: add a param
#define MAXCNAMELEN 128 // Max column name length
#define DEF_ROWSET 100 // Default rowset
#define MAX_ROWSET 1000 // Default rowset
#define MAX_NUMERIC_CHARLEN 128 // Max NUMERIC size in characters
#define MAX_ODBC_ERROR_LEN 1024 // Max ODBC Error Length
SQLHENV Oenv = 0 ; // ODBC Environment handle
SQLHDBC Ocon = 0 ; // ODBC Connection handle
SQLHSTMT Ost = 0 ; // ODBC Statement handle
bool is_select = false ; // Command is a SELECT
std::string query = "" ; // set in Factory/getReturnType, used (non-DQL) in processPartition
SQLUSMALLINT Oncol = 0 ; // Number of result set columns
SQLSMALLINT *Odt = 0 ; // Result set Data Type Array pointer
SQLSMALLINT *Odd = 0 ; // Result set Decimals Array pointer
SQLULEN *Ors = 0 ; // Result Set Column size pointer
size_t *desz = 0 ; // Data Element Size Array pointer
SQLULEN nfr ; // Number of fetched rows
SizedColumnTypes colInfo ; // Set in getReturnType factory, used in processPartition
enum DBs {
GENERIC = 0,
POSTGRES,
VERTICA,
SQLSERVER,
TERADATA,
ORACLE,
MYSQL
};
void clean() {
if ( Odt ) {
free(Odt) ;
Odt = 0 ;
}
if ( Odd ) {
free(Odd) ;
Odd = 0 ;
}
if ( Ors ) {
free(Ors);
Ors = 0 ;
}
if ( desz ) {
free(desz);
desz = 0 ;
}
if ( Ost ) {
(void)SQLFreeHandle(SQL_HANDLE_STMT, Ost);
Ost = 0 ;
}
if ( Ocon ) {
(void)SQLDisconnect(Ocon);
(void)SQLFreeHandle(SQL_HANDLE_DBC, Ocon);
Ocon = 0 ;
}
if ( Oenv ) {
(void)SQLFreeHandle(SQL_HANDLE_ENV, Oenv);
Oenv = 0 ;
}
}
void ex_err ( SQLSMALLINT htype, SQLHANDLE Oh, int loc , const char *vtext ) {
SQLCHAR Oerr_state[6] ; // ODBC Error State
SQLINTEGER Oerr_native = 0 ; // ODBC Error Native Code
SQLCHAR Oerr_text[MAX_ODBC_ERROR_LEN] ; // ODBC Error Text
SQLRETURN Oret = 0 ;
SQLSMALLINT Oln = 0 ;
Oerr_state[0] = Oerr_text[0] = '\0' ;
if ( htype == 0 ) {
vt_report_error(loc, "DBLINK. %s", vtext);
} else if ( ( Oret = SQLGetDiagRec ( htype, Oh, 1, Oerr_state, &Oerr_native, Oerr_text,
(SQLSMALLINT)MAX_ODBC_ERROR_LEN, &Oln) ) != SQL_SUCCESS ) {
clean();
vt_report_error(loc, "DBLINK. %s. Unable to display ODBC error message", vtext);
} else {
clean();
vt_report_error(loc, "DBLINK. %s. State %s. Native Code %d. Error text: %s%c",
vtext, (char *)Oerr_state, (int)Oerr_native, (char *) Oerr_text,
( Oln > MAX_ODBC_ERROR_LEN ) ? '>' : '.' ) ;
}
}
class DBLink : public TransformFunction
{
DBs dbt ;
SQLPOINTER *Ores ; // result array pointers pointer
SQLLEN **Olen ; // length array pointers pointer
StringParsers parser ;
size_t rowset ; // Fetch rowset
virtual void setup(ServerInterface &srvInterface, const SizedColumnTypes &argTypes)
{
SQLRETURN Oret = 0 ;
SQLHSTMT Ostmt = 0 ;
SQLCHAR Obuff[64];
memset(&Obuff[0], 0, sizeof(Obuff));
// Check the DBMS we are connecting to:
if (!SQL_SUCCEEDED(Oret=SQLAllocHandle(SQL_HANDLE_STMT, Ocon, &Ostmt))){
ex_err(SQL_HANDLE_DBC, Ocon, 201, "Error allocating Statement Handle");
}
if (!SQL_SUCCEEDED(Oret=SQLGetInfo(Ocon, SQL_DBMS_NAME,
(SQLPOINTER)Obuff, (SQLSMALLINT)sizeof(Obuff), NULL))) {
ex_err(SQL_HANDLE_DBC, Ocon, 202, "Error getting remote DBMS Name");
}
if ( !strcmp((char *)Obuff, "Oracle") ) {
dbt = ORACLE ;
} else {
dbt = GENERIC ;
}
(void)SQLFreeHandle(SQL_HANDLE_STMT, Ostmt);
// Read/Set rowset Param:
ParamReader params = srvInterface.getParamReader();
if( params.containsParameter("rowset") ) {
vint rowset_param = params.getIntRef("rowset") ;
if ( rowset_param < 1 || rowset_param > MAX_ROWSET ) {
ex_err(0, 0, 203, "DBLINK. Error rowset out of range");
} else {
rowset = (size_t) rowset_param ;
}
} else {
rowset = DEF_ROWSET ;
}
}
virtual void cancel(ServerInterface &srvInterface)
{
SQLRETURN Oret = 0 ;
if ( Ost ) {
if (!SQL_SUCCEEDED(Oret=SQLCancel(Ost)))
ex_err(SQL_HANDLE_STMT, Ost, 301, "Error canceling SQL statement");
}
clean() ;
}
virtual void destroy(ServerInterface &srvInterface, const SizedColumnTypes &argTypes)
{
clean() ;
}
virtual void processPartition(ServerInterface &srvInterface,
PartitionReader & inputReader,
PartitionWriter & outputWriter)
{
SQLRETURN Oret = 0 ;
SQLPOINTER Odp = 0 ; // Data Element Pointer
SQLULEN Odl = 0 ; // Data Element Length
try
{
if ( is_select ) {
// Allocate memory for Result Set and length array pointers:
Ores = (SQLPOINTER *)srvInterface.allocator->alloc(Oncol * sizeof(SQLPOINTER)) ;
Olen = (SQLLEN **)srvInterface.allocator->alloc(Oncol * sizeof(SQLLEN *)) ;
// Allocate space for each column and bind it:
for ( unsigned int j = 0 ; j < Oncol ; j++ ) {
Olen[j] = (SQLLEN *)srvInterface.allocator->alloc(sizeof(SQLLEN) * rowset);
switch(Odt[j]) {
case SQL_SMALLINT:
case SQL_INTEGER:
case SQL_TINYINT:
case SQL_BIGINT:
if ( dbt == ORACLE )
desz[j] = (size_t)(Ors[j] + 1) ;
Ores[j] = (SQLPOINTER)srvInterface.allocator->alloc(desz[j] * rowset);
if (!SQL_SUCCEEDED(Oret=SQLBindCol(Ost, j+1, (dbt==ORACLE) ? SQL_C_CHAR : SQL_C_SBIGINT, Ores[j], desz[j], Olen[j]))){
ex_err(SQL_HANDLE_STMT, Ost, 401, "Error binding column");
}
break ;
case SQL_REAL:
case SQL_DOUBLE:
case SQL_FLOAT:
Ores[j] = (SQLPOINTER)srvInterface.allocator->alloc(desz[j] * rowset);
if (!SQL_SUCCEEDED(Oret=SQLBindCol(Ost, j+1, SQL_C_DOUBLE, Ores[j], desz[j], Olen[j])))
ex_err(SQL_HANDLE_STMT, Ost, 401, "Error binding column");
break ;
case SQL_NUMERIC:
case SQL_DECIMAL:
Ores[j] = (SQLPOINTER)srvInterface.allocator->alloc(desz[j] * rowset);
if (!SQL_SUCCEEDED(Oret=SQLBindCol(Ost, j+1, SQL_C_CHAR, Ores[j], desz[j], Olen[j])))
ex_err(SQL_HANDLE_STMT, Ost, 401, "Error binding column");
break ;
case SQL_WCHAR:
case SQL_WVARCHAR:
case SQL_WLONGVARCHAR:
case SQL_CHAR:
case SQL_VARCHAR:
case SQL_LONGVARCHAR:
Ores[j] = (SQLPOINTER)srvInterface.allocator->alloc(desz[j] * rowset);
if (!SQL_SUCCEEDED(Oret=SQLBindCol(Ost, j+1, SQL_C_CHAR, Ores[j], desz[j], Olen[j])))
ex_err(SQL_HANDLE_STMT, Ost, 401, "Error binding column");
break ;
case SQL_TYPE_TIME:
Ores[j] = (SQLPOINTER)srvInterface.allocator->alloc(desz[j] * rowset);
if (!SQL_SUCCEEDED(Oret=SQLBindCol(Ost, j+1, SQL_C_TIME, Ores[j], desz[j], Olen[j])))
ex_err(SQL_HANDLE_STMT, Ost, 401, "Error binding column");
break ;
case SQL_TYPE_DATE:
Ores[j] = (SQLPOINTER)srvInterface.allocator->alloc(desz[j] * rowset);
if (!SQL_SUCCEEDED(Oret=SQLBindCol(Ost, j+1, SQL_C_DATE, Ores[j], desz[j], Olen[j])))
ex_err(SQL_HANDLE_STMT, Ost, 401, "Error binding column");
break ;
case SQL_TYPE_TIMESTAMP:
Ores[j] = (SQLPOINTER)srvInterface.allocator->alloc(desz[j] * rowset);
if (!SQL_SUCCEEDED(Oret=SQLBindCol(Ost, j+1, SQL_C_TIMESTAMP, Ores[j], desz[j], Olen[j])))
ex_err(SQL_HANDLE_STMT, Ost, 401, "Error binding column");
break ;
case SQL_BIT:
Ores[j] = (SQLPOINTER)srvInterface.allocator->alloc(desz[j] * rowset);
if (!SQL_SUCCEEDED(Oret=SQLBindCol(Ost, j+1, SQL_C_BIT, Ores[j], desz[j], Olen[j])))
ex_err(SQL_HANDLE_STMT, Ost, 401, "Error binding column");
break ;
case SQL_BINARY:
case SQL_VARBINARY:
case SQL_LONGVARBINARY:
Ores[j] = (SQLPOINTER)srvInterface.allocator->alloc(desz[j] * rowset);
if (!SQL_SUCCEEDED(Oret=SQLBindCol(Ost, j+1, SQL_C_BINARY, Ores[j], desz[j], Olen[j])))
ex_err(SQL_HANDLE_STMT, Ost, 401, "Error binding column");
break ;
case SQL_INTERVAL_YEAR_TO_MONTH:
// FIX: support this data type
Ores[j] = (SQLPOINTER)srvInterface.allocator->alloc(desz[j] * rowset);
if (!SQL_SUCCEEDED(Oret=SQLBindCol(Ost, j+1, SQL_C_INTERVAL_YEAR_TO_MONTH, Ores[j], desz[j], Olen[j])))
ex_err(SQL_HANDLE_STMT, Ost, 401, "Error binding column");
break ;
case SQL_INTERVAL_DAY_TO_SECOND:
// FIX: support this data type
Ores[j] = (SQLPOINTER)srvInterface.allocator->alloc(desz[j] * rowset);
if (!SQL_SUCCEEDED(Oret=SQLBindCol(Ost, j+1, SQL_C_INTERVAL_DAY_TO_SECOND, Ores[j], desz[j], Olen[j])))
ex_err(SQL_HANDLE_STMT, Ost, 401, "Error binding column");
break;
}
}
// Set Statement attributes:
if (!SQL_SUCCEEDED(Oret=SQLSetStmtAttr(Ost, SQL_ATTR_ROW_BIND_TYPE, (SQLPOINTER)SQL_BIND_BY_COLUMN, 0))) {
ex_err(SQL_HANDLE_STMT, Ost, 402, "Error setting statement attribute SQL_ATTR_ROW_BIND_TYPE");
}
if (!SQL_SUCCEEDED(Oret=SQLSetStmtAttr(Ost, SQL_ATTR_ROW_ARRAY_SIZE, (SQLPOINTER)rowset, 0))) {
ex_err(SQL_HANDLE_STMT, Ost, 402, "Error setting statement attribute SQL_ATTR_ROW_ARRAY_SIZE");
}
if (!SQL_SUCCEEDED(Oret=SQLSetStmtAttr(Ost, SQL_ATTR_ROWS_FETCHED_PTR, &nfr, 0))) {
ex_err(SQL_HANDLE_STMT, Ost, 402, "Error setting statement attribute SQL_ATTR_ROWS_FETCHED_PTR");
}
// Execute Stateent:
if (!SQL_SUCCEEDED(Oret=SQLExecute(Ost)) && Oret != SQL_NO_DATA ) {
ex_err(SQL_HANDLE_STMT, Ost, 403, "Error executing the statement");
}
// Fetch loop:
while ( SQL_SUCCEEDED(Oret=SQLFetchScroll(Ost, SQL_FETCH_NEXT, 0)) && !isCanceled() ) {
for ( unsigned int i = 0 ; i < nfr ; i++, outputWriter.next() ) {
for ( unsigned int j = 0 ; j < Oncol ; j++ ) {
Odp = (SQLPOINTER)((uint8_t *)Ores[j] + desz[j] * i) ;
Odl = Olen[j][i] ;
if ( (int)Odl == (int)SQL_NULL_DATA ) {
outputWriter.setNull(j) ;
continue ;
}
switch(Odt[j]) {
case SQL_SMALLINT:
case SQL_INTEGER:
case SQL_TINYINT:
case SQL_BIGINT:
if ( dbt == ORACLE ) {
outputWriter.setInt(j, ((int)Odl == SQL_NTS) ? vint_null : (vint)atoll((char *)Odp) ) ;
} else {
outputWriter.setInt(j, *(SQLBIGINT *)Odp) ;
}
break ;
case SQL_REAL:
case SQL_DOUBLE:
case SQL_FLOAT:
outputWriter.setFloat(j, *(SQLDOUBLE *)Odp) ;
break ;
case SQL_NUMERIC:
case SQL_DECIMAL:
{
std::string rejectReason = "Unrecognized remote database format" ;
if ( *(char *)Odp == '\0' ) { // some DBs might use empty strings for NUMERIC nulls
outputWriter.setNull(j) ;
} else {
if (!parser.parseNumeric((char*)Odp, (size_t)Odl, j,
outputWriter.getNumericRef(j), colInfo.getColumnType(j), rejectReason)) {
ex_err(0, 0, 404, "Error parsing Numeric");
}
}
break ;
}
case SQL_CHAR:
case SQL_WCHAR:
case SQL_VARCHAR:
case SQL_WVARCHAR:
case SQL_LONGVARCHAR:
case SQL_WLONGVARCHAR:
case SQL_BINARY:
case SQL_VARBINARY:
case SQL_LONGVARBINARY:
if ( (int)Odl == SQL_NTS )
Odl = (SQLULEN)strnlen((char *)Odp , desz[j]);
outputWriter.getStringRef(j).copy((char *)Odp, Odl ) ;
break ;
case SQL_TYPE_TIME:
{
SQL_TIME_STRUCT &st = *(SQL_TIME_STRUCT *)Odp ;
outputWriter.setTime(j, getTimeFromUnixTime(st.second + st.minute * 60 + st.hour * 3600 ) );
break ;
}
case SQL_TYPE_DATE:
{
SQL_DATE_STRUCT &sd = *(SQL_DATE_STRUCT *)Odp ;
struct tm d = { 0, 0, 0, sd.day, sd.month - 1, sd.year - 1900, 0, 0, -1 } ;
time_t utime = mktime ( &d ) ;
outputWriter.setDate(j, getDateFromUnixTime(utime + d.tm_gmtoff) ) ;
break ;
}
case SQL_TYPE_TIMESTAMP:
{
SQL_TIMESTAMP_STRUCT &ss = *(SQL_TIMESTAMP_STRUCT *)Odp ;
struct tm ts = { ss.second, ss.minute, ss.hour, ss.day, ss.month - 1, ss.year - 1900, 0, 0, -1 } ;
time_t utime = mktime ( &ts ) ;
outputWriter.setTimestamp(j, getTimestampFromUnixTime(utime + ts.tm_gmtoff) + ss.fraction / 1000 ) ;
break ;
}
case SQL_BIT:
outputWriter.setBool(j, *(SQLCHAR *)Odp == SQL_TRUE ? VTrue : VFalse);
break ;
case SQL_INTERVAL_YEAR_TO_MONTH: // Vertica stores these Intervals as durations in months
{
SQL_INTERVAL_STRUCT &intv = *(SQL_INTERVAL_STRUCT*)Odp;
if (intv.interval_type != SQL_IS_YEAR_TO_MONTH) {
ex_err(0, 0, 405, "Unsupported INTERVAL data type. Expecting SQL_IS_YEAR_TO_MONTH");
}
Interval ret = ( (intv.intval.year_month.year*MONTHS_PER_YEAR)
+ (intv.intval.year_month.month))
* (intv.interval_sign == SQL_TRUE ? -1 : 1);
outputWriter.setInterval(j, ret);
break ;
}
case SQL_INTERVAL_DAY_TO_SECOND: // Vertica stores these Intervals as durations in microseconds
{
SQL_INTERVAL_STRUCT &intv = *(SQL_INTERVAL_STRUCT*)Odp;
if (intv.interval_type != SQL_IS_DAY_TO_SECOND) {
ex_err(0, 0, 406, "Unsupported INTERVAL data type. Expecting SQL_IS_DAY_TO_SECOND");
}
Interval ret = ( (intv.intval.day_second.day*usPerDay)
+ (intv.intval.day_second.hour*usPerHour)
+ (intv.intval.day_second.minute*usPerMinute)
+ (intv.intval.day_second.second*usPerSecond)
+ (intv.intval.day_second.fraction/1000))
* (intv.interval_sign == SQL_TRUE ? -1 : 1);
outputWriter.setInterval(j, ret);
break ;
}
default:
vt_report_error(407, "DBLINK. Unsupported data type for column %u", j);
break ;
}
}
}
}
} else {
if (!SQL_SUCCEEDED(Oret=SQLExecDirect (Ost, (SQLCHAR *)query.c_str(), SQL_NTS))) {
ex_err(SQL_HANDLE_STMT, Ost, 408, "Error executing statement");
}
outputWriter.setInt(0, (vint)Oret) ;
outputWriter.next() ;
}
clean() ;
}
catch (exception& e)
{
clean();
vt_report_error(400, "Exception while processing partition: [%s]", e.what());
}
}
};
class DBLinkFactory : public TransformFunctionFactory
{
virtual void getPrototype(ServerInterface &srvInterface,
ColumnTypes &argTypes,
ColumnTypes &returnType )
{
returnType.addAny();
}
virtual void getReturnType(ServerInterface &srvInterface,
const SizedColumnTypes &inputTypes,
SizedColumnTypes &outputTypes )
{
SQLRETURN Oret = 0 ;
SQLSMALLINT Onamel = 0 ;
SQLSMALLINT Onull = 0 ;
SQLCHAR Ocname[MAXCNAMELEN] ;
std::string cid = "" ;
std::string cid_env = "" ;
std::string cid_file = DBLINK_CIDS ;
std::string cid_name = "" ;
std::string cid_value = "" ;
bool connect = false ;
// Read Params:
ParamReader params = srvInterface.getParamReader();
if( params.containsParameter("cidfile") ) { // Start checking "cidfile" param
cid_file = params.getStringRef("cidfile").str() ;
#ifdef DBLINK_DEBUG
srvInterface.log("DEBUG DBLINK read param cidfile=<%s>", cid_file.c_str() );
#endif
}
if( params.containsParameter("cid") ) { // Start checking "cid" param
cid = params.getStringRef("cid").str() ;
#ifdef DBLINK_DEBUG
srvInterface.log("DEBUG DBLINK read param cid=<%s>", cid.c_str() );
#endif
} else if( params.containsParameter("connect_secret") ) { // if "cid" is undef try with "connect_secret"
connect = true ;
cid = params.getStringRef("connect_secret").str() ;
} else if( params.containsParameter("connect") ) { // if "cid" is undef try with "connect"
connect = true ;
cid = params.getStringRef("connect").str() ;
} else if (srvInterface.getUDSessionParamReader("library").containsParameter("dblink_secret")) {
// if "cid", "connect_secret" and "connect" are not defined try "dblink_secret" session param
connect = true ;
cid = srvInterface.getUDSessionParamReader("library").getStringRef("dblink_secret").str() ;
} else {
vt_report_error(101, "DBLINK. Missing connection parameters");
}
if( params.containsParameter("query") ) {
query = params.getStringRef("query").str() ;
#ifdef DBLINK_DEBUG
srvInterface.log("DEBUG DBLINK read param query=<%s>", query.c_str() );
#endif
} else {
vt_report_error(102, "DBLINK. Missing query parameter");
}
// Check connection parameters
if ( connect ) { // old VFQ connect style: connect='@/tmp/file.txt' will read CIDs from a different file
if ( cid[0] == '@' ) {
std::ifstream cids(cid.substr(1)) ;
if ( cids.is_open() ) {
std::stringstream ssFile;
ssFile << cids.rdbuf() ;
cid_value = ssFile.str() ;
cid_value.erase(std::remove(cid_value.begin(), cid_value.end(), '\n'), cid_value.end());
} else {
vt_report_error(103, "DBLINK. Error reading <%s>", cid.substr(1).c_str());
}
} else {
cid_value = cid ;
}
} else { // new CID connect style:
std::ifstream cids(cid_file) ;
if ( cids.is_open() ) {
std::string cline ;
size_t pos ;
while ( getline(cids, cline) ) {
if ( cline[0] == '#' || cline.empty() )
continue ; // skip empty lines & comments
if ( ( pos = cline.find(":") ) != std::string::npos ) {
cid_name = cline.substr(0, pos) ;
if ( cid_name == cid )
cid_value = cline.substr(pos + 1, std::string::npos ) ;
else if ( cid_name == cid + "$" ) {
cid_env = cline.substr(pos + 1, std::string::npos ) ;
std::stringstream se_stream ( cid_env ) ;
std::string token ;
while ( std::getline ( se_stream, token, ';' ) ) {
size_t pos = 0 ;
if ( ( pos = token.find('=') ) && pos != std::string::npos ) {
#ifdef DBLINK_DEBUG
srvInterface.log("DEBUG DBLINK setting <%s> to <%s>", token.substr(0, pos).c_str(), token.substr(pos+1).c_str() );
#endif
setenv ( token.substr(0, pos).c_str(), token.substr(pos + 1).c_str(), 1);
}
}
}
} else {
continue ; // skip malformed lines
}
}
cids.close() ;
} else {
vt_report_error(104, "DBLINK. Error reading <%s>", cid_file);
}
if ( cid_value.empty() ) {
vt_report_error(105, "DBLINK. Error finding CID <%s> in <%s>", cid.c_str(), DBLINK_CIDS);
}
}
// Check if "query" is a script file name:
if ( query[0] == '@' ) {
std::ifstream qscript(query.substr(1)) ;
if ( qscript.is_open() ) {
std::stringstream ssFile;
ssFile << qscript.rdbuf() ;
query = ssFile.str() ;
} else {
vt_report_error(106, "DBLINK. Error reading query from <%s>", query.substr(1).c_str());
}
}
// ODBC Connection:
if (!SQL_SUCCEEDED(Oret=SQLAllocHandle(SQL_HANDLE_ENV, (SQLHANDLE)SQL_NULL_HANDLE, &Oenv))){
ex_err(0, 0, 107, "Error allocating Environment Handle");
}
if (!SQL_SUCCEEDED(Oret=SQLSetEnvAttr(Oenv, SQL_ATTR_ODBC_VERSION, (void *) SQL_OV_ODBC3, 0))){
ex_err(0, 0, 108, "Error setting SQL_OV_ODBC3");
}
if (!SQL_SUCCEEDED(Oret=SQLAllocHandle(SQL_HANDLE_DBC, Oenv, &Ocon))){
ex_err(0, 0, 109, "Error allocating Connection Handle");
}
if (!SQL_SUCCEEDED(Oret=SQLDriverConnect(Ocon, (SQLHWND)NULL, (SQLCHAR *)cid_value.c_str(), SQL_NTS, NULL, 0, NULL, SQL_DRIVER_NOPROMPT))){
ex_err(SQL_HANDLE_DBC, Ocon, 110, "Error connecting to target database");
}
// Determine Statement type:
query.erase(0, query.find_first_not_of(" \n\t\r")) ;
if ( !strncasecmp(query.c_str(), "SELECT", 6) )
is_select = true ;
// ODBC Statement preparation:
if (!SQL_SUCCEEDED(Oret=SQLAllocHandle(SQL_HANDLE_STMT, Ocon, &Ost))){
ex_err(SQL_HANDLE_DBC, Ocon, 111, "Error allocating Statement Handle");
}
if ( is_select ) {
if (!SQL_SUCCEEDED(Oret=SQLPrepare(Ost, (SQLCHAR *)query.c_str(), SQL_NTS))) {
ex_err(SQL_HANDLE_STMT, Ost, 112, "Error preparing the statement");
}
if (!SQL_SUCCEEDED(Oret=SQLNumResultCols(Ost, (SQLSMALLINT *)&Oncol))) {
ex_err(SQL_HANDLE_STMT, Ost, 115, "Error finding the number of resulting columns");
}
if ( (Odt = (SQLSMALLINT *)calloc ((size_t)Oncol, sizeof(SQLSMALLINT))) == (void *)NULL ) {
ex_err(0, 0, 116, "Error allocating data types array");
}
if ( (Ors = (SQLULEN *)calloc ((size_t)Oncol, sizeof(SQLULEN))) == (void *)NULL ) {
ex_err(0, 0, 117, "Error allocating result set columns size array");
}
if ( (desz = (size_t *)calloc ((size_t)Oncol, sizeof(size_t))) == (void *)NULL ) {
ex_err(0, 0, 118, "Error allocating data element size array");
}
if ( (Odd = (SQLSMALLINT *)calloc ((size_t)Oncol, sizeof(SQLSMALLINT))) == (void *)NULL ) {
ex_err(0, 0, 119, "Error allocating result set decimal size array");
}
for ( unsigned int j = 0 ; j < Oncol ; j++ ) {
SQLLEN Ool = 0 ;
if ( !SQL_SUCCEEDED(Oret=SQLDescribeCol(Ost, (SQLUSMALLINT)(j+1),
Ocname, (SQLSMALLINT) MAXCNAMELEN, &Onamel,
&Odt[j], &Ors[j], &Odd[j], &Onull))) {
ex_err(SQL_HANDLE_STMT, Ost, 120, "Error getting column description");
}
#ifdef DBLINK_DEBUG
srvInterface.log("DEBUG DBLINK SQLDescribeCol src column=%u name=%s data_type=%d length=%zu", j, (char *)Ocname, Odt[j], Ors[j]);
#endif
std::string cname((char *)Ocname);
switch(Odt[j]) {
case SQL_SMALLINT:
case SQL_INTEGER:
case SQL_TINYINT:
case SQL_BIGINT:
// we change this later on if the remote db is Oracle
desz[j] = sizeof(vint) ;
outputTypes.addInt(cname) ;
break ;
case SQL_REAL:
case SQL_DOUBLE:
case SQL_FLOAT:
desz[j] = sizeof(vfloat) ;
outputTypes.addFloat(cname) ;
break ;
case SQL_NUMERIC:
case SQL_DECIMAL:
desz[j] = MAX_NUMERIC_CHARLEN ;
outputTypes.addNumeric((int32)Ors[j], (int32)Odd[j], cname) ;
break ;
case SQL_CHAR:
case SQL_WCHAR:
if( !SQL_SUCCEEDED(Oret=SQLColAttribute(Ost, (SQLUSMALLINT)(j+1), SQL_DESC_OCTET_LENGTH,
(SQLPOINTER) NULL, (SQLSMALLINT) 0, (SQLSMALLINT *) NULL, &Ool))) {
ex_err(SQL_HANDLE_STMT, Ost, 120, "Error getting column description");
}
#ifdef DBLINK_DEBUG
srvInterface.log("DEBUG DBLINK SQLColAttribute SQL_DESC_OCTET_LENGTH src column=%u name=%s data_type=%d length=%ld", j, (char *)Ocname, Odt[j], Ool);
#endif
if ( Ool > 0 && (SQLULEN)Ool > Ors[j] )
Ors[j] = Ool ;
if ( Ors[j] > 65000 ) {
srvInterface.log("DBLINK SQL_[W]CHAR column %s of length %zu limited to 65000 bytes", (char *)Ocname, Ors[j]);
Ors[j] = 65000;
}
desz[j] = (size_t)(Ors[j] + 1) ;
if ( !Ors[j] )
Ors[j] = 1 ;
outputTypes.addChar((int32)Ors[j], cname) ;
break ;
case SQL_VARCHAR:
case SQL_WVARCHAR:
if( !SQL_SUCCEEDED(Oret=SQLColAttribute(Ost, (SQLUSMALLINT)(j+1), SQL_DESC_OCTET_LENGTH,
(SQLPOINTER) NULL, (SQLSMALLINT) 0, (SQLSMALLINT *) NULL, &Ool))) {
ex_err(SQL_HANDLE_STMT, Ost, 120, "Error getting column description");
}
#ifdef DBLINK_DEBUG
srvInterface.log("DEBUG DBLINK SQLColAttribute SQL_DESC_OCTET_LENGTH src column=%u name=%s data_type=%d length=%ld", j, (char *)Ocname, Odt[j], Ool);
#endif
if ( Ool > 0 && (SQLULEN)Ool > Ors[j] )
Ors[j] = Ool ;
if ( Ors[j] > 65000 ) {
srvInterface.log("DBLINK SQL_[W]VARCHAR column %s of length %zu limited to 65000 bytes", (char *)Ocname, Ors[j]);
Ors[j] = 65000;
}
desz[j] = (size_t)(Ors[j] + 1) ;
if ( !Ors[j] )
Ors[j] = 1 ;
outputTypes.addVarchar((int32)Ors[j], cname) ;
break ;
case SQL_LONGVARCHAR:
case SQL_WLONGVARCHAR:
if( !SQL_SUCCEEDED(Oret=SQLColAttribute(Ost, (SQLUSMALLINT)(j+1), SQL_DESC_OCTET_LENGTH,
(SQLPOINTER) NULL, (SQLSMALLINT) 0, (SQLSMALLINT *) NULL, &Ool))) {
ex_err(SQL_HANDLE_STMT, Ost, 120, "Error getting column description");
}
#ifdef DBLINK_DEBUG
srvInterface.log("DEBUG DBLINK SQLColAttribute SQL_DESC_OCTET_LENGTH src column=%u name=%s data_type=%d length=%ld", j, (char *)Ocname, Odt[j], Ool);
#endif
if ( Ool > 0 && (SQLULEN)Ool > Ors[j] )
Ors[j] = Ool ;
if ( Ors[j] > 32000000 ) {
srvInterface.log("DBLINK SQL_LONG[W]VARCHAR column %s of length %zu limited to 32000000 bytes", (char *)Ocname, Ors[j]);
Ors[j] = 32000000;
}
desz[j] = (size_t)(Ors[j] + 1) ;
if ( !Ors[j] )
Ors[j] = 1 ;
outputTypes.addLongVarchar((int32)Ors[j], cname) ;
break ;
case SQL_TYPE_TIME:
desz[j] = sizeof(SQL_TIME_STRUCT) ;
outputTypes.addTime((int32)Odd[j], cname) ;
break ;
case SQL_TYPE_DATE:
desz[j] = sizeof(SQL_DATE_STRUCT) ;
outputTypes.addDate(cname) ;
break ;
case SQL_TYPE_TIMESTAMP:
desz[j] = sizeof(SQL_TIMESTAMP_STRUCT) ;
outputTypes.addTimestamp((int32)Odd[j], cname) ;
break ;
case SQL_BIT:
desz[j] = 1 ;
outputTypes.addBool(cname) ;
break ;
case SQL_BINARY:
if ( Ors[j] > 65000 ) {
srvInterface.log("DBLINK SQL_BINARY column %s of length %zu limited to 65000 bytes", (char *)Ocname, Ors[j]);
Ors[j] = 65000;
}
desz[j] = (size_t)(Ors[j] + 1) ;
outputTypes.addBinary((int32)Ors[j], cname) ;
break ;
case SQL_VARBINARY:
if ( Ors[j] > 65000 ) {
srvInterface.log("DBLINK SQL_VARBINARY column %s of length %zu limited to 65000 bytes", (char *)Ocname, Ors[j]);
Ors[j] = 65000;
}
desz[j] = (size_t)(Ors[j] + 1) ;
outputTypes.addVarbinary((int32)Ors[j], cname) ;
break ;
case SQL_LONGVARBINARY:
if ( Ors[j] > 32000000 ) {
srvInterface.log("DBLINK SQL_LONGVARBINARY column %s of length %zu limited to 32000000 bytes", (char *)Ocname, Ors[j]);
Ors[j] = 32000000;
}
desz[j] = (size_t)(Ors[j] + 1) ;
outputTypes.addLongVarbinary((int32)Ors[j], cname) ;
break ;
case SQL_INTERVAL_YEAR_TO_MONTH:
desz[j] = sizeof(SQL_INTERVAL_STRUCT) ;
outputTypes.addIntervalYM(INTERVAL_YEAR2MONTH, cname) ;
break ;
case SQL_INTERVAL_DAY_TO_SECOND:
desz[j] = sizeof(SQL_INTERVAL_STRUCT) ;
outputTypes.addInterval((int32)Odd[j], INTERVAL_DAY2SECOND, cname) ;
break ;
default:
vt_report_error(121, "DBLINK. Unsupported data type for column %u", j);
}
}
colInfo = outputTypes ;
} else {
outputTypes.addInt("dblink") ;
}
}
virtual void getParameterType(ServerInterface &srvInterface, SizedColumnTypes ¶meterTypes)
{
parameterTypes.addVarchar(1024, "cid", { true, false, false, "Connection Identifier Database. Identifies an entry in the connection identifier database." });
parameterTypes.addVarchar(1024, "connect", { true, false, false, "The ODBC connection string containing the DSN and credentials." });
parameterTypes.addVarchar(1024, "connect_secret", { true, false, false, "The ODBC connection string containing the DSN and credentials." });
parameterTypes.addVarchar(1024, "cidfile", { true, false, false, "Connection Identifier File Path." });
parameterTypes.addVarchar(65000, "query", { true, false, false, "The query being pushed on the remote database. Or, '@' followed by the name of the file containing the query." });
parameterTypes.addInt("rowset", { true, false, false, "Number of rows retrieved from the remote database during each SQLFetch() cycle. Default is 100." });
}
virtual TransformFunction *createTransformFunction( ServerInterface &srvInterface )
{
return vt_createFuncObject<DBLink>(srvInterface.allocator);
}
};
RegisterFactory(DBLinkFactory);
RegisterLibrary (
"Maurizio Felici",
__DATE__,
"0.3.0",
"12.0.4",
"DBLINK: run SQL on other databases",
"",
""
);