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/*
* PROGRAM: Object oriented API samples.
* MODULE: 03.select.cpp
* DESCRIPTION: A sample of running SELECT statement without parameters.
* Prints string fields in a table, coercing VARCHAR to CHAR.
* Learns how to coerce output data in prepared statement
* and execute it.
*
* Example for the following interfaces:
*
* IStatement - SQL statement execution
* IMessageMetadata - describe input and output data format
* IResultSet - fetch data returned by statement after execution
*
* The contents of this file are subject to the Initial
* Developer's Public License Version 1.0 (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.ibphoenix.com/main.nfs?a=ibphoenix&page=ibp_idpl.
*
* Software distributed under the License is distributed AS IS,
* WITHOUT WARRANTY OF ANY KIND, either express or implied.
* See the License for the specific language governing rights
* and limitations under the License.
*
* The Original Code was created by Alexander Peshkoff
* for the Firebird Open Source RDBMS project.
*
* Copyright (c) 2013 Alexander Peshkoff <peshkoff@mail.ru>
* and all contributors signed below.
*
* All Rights Reserved.
* Contributor(s): ______________________________________.
*/
#include "ifaceExamples.h"
static IMaster* master = fb_get_master_interface();
int main()
{
int rc = 0;
// set default password if none specified in environment
setenv("ISC_USER", "sysdba", 0);
setenv("ISC_PASSWORD", "masterkey", 0);
// status vector and main dispatcher
ThrowStatusWrapper status(master->getStatus());
IProvider* prov = master->getDispatcher();
IUtil* utl = master->getUtilInterface();
// declare pointers to required interfaces
IAttachment* att = NULL;
ITransaction* tra = NULL;
IStatement* stmt = NULL;
IMessageMetadata* meta = NULL;
IMetadataBuilder* builder = NULL;
IXpbBuilder* tpb = NULL;
// Interface provides access to data returned by SELECT statement
IResultSet* curs = NULL;
try
{
// attach employee db
att = prov->attachDatabase(&status, "employee", 0, NULL);
// start read only transaction
tpb = utl->getXpbBuilder(&status, IXpbBuilder::TPB, NULL, 0);
tpb->insertTag(&status, isc_tpb_read_committed);
tpb->insertTag(&status, isc_tpb_no_rec_version);
tpb->insertTag(&status, isc_tpb_wait);
tpb->insertTag(&status, isc_tpb_read);
tra = att->startTransaction(&status, tpb->getBufferLength(&status), tpb->getBuffer(&status));
// prepare statement
stmt = att->prepare(&status, tra, 0, "select last_name, first_name, phone_ext from phone_list "
"where location = 'Monterey' order by last_name, first_name",
SAMPLES_DIALECT, IStatement::PREPARE_PREFETCH_METADATA);
// get list of columns
meta = stmt->getOutputMetadata(&status);
builder = meta->getBuilder(&status);
unsigned cols = meta->getCount(&status);
// struct to cache received metadata
struct MyField
{
const char* name;
unsigned length, offset;
};
MyField* fields = new MyField[cols];
memset(fields, 0, sizeof(MyField) * cols);
// parse columns list & coerce datatype(s)
for (unsigned j = 0; j < cols; ++j)
{
unsigned t = meta->getType(&status, j);
if (t == SQL_VARYING || t == SQL_TEXT)
{
builder->setType(&status, j, SQL_TEXT);
fields[j].name = meta->getField(&status, j);
}
}
// release automatically created metadata
// metadata is not database object, therefore no specific call to close it
meta->release();
// get metadata with coerced datatypes
meta = builder->getMetadata(&status);
// builder not needed any more
builder->release();
builder = NULL;
// now we may also get offsets info
for (unsigned j = 0; j < cols; ++j)
{
if (fields[j].name)
{
fields[j].length = meta->getLength(&status, j);
fields[j].offset = meta->getOffset(&status, j);
}
}
// open cursor
curs = stmt->openCursor(&status, tra, NULL, NULL, meta, 0);
// allocate output buffer
unsigned l = meta->getMessageLength(&status);
unsigned char* buffer = new unsigned char[l];
// fetch records from cursor and print them
for (int line = 0; curs->fetchNext(&status, buffer) == IStatus::RESULT_OK; ++line)
{
if (line % 10 == 0)
{
printf("\n");
for (unsigned j = 0; j < cols; ++j)
{
if (fields[j].name)
{
printf("%-*.*s ", fields[j].length, fields[j].length, fields[j].name);
}
}
printf("\n");
}
for (unsigned j = 0; j < cols; ++j)
{
if (fields[j].name)
{
printf("%*.*s ", fields[j].length, fields[j].length, buffer + fields[j].offset);
}
}
printf("\n");
}
printf("\n");
// close interfaces
curs->close(&status);
curs = NULL;
stmt->free(&status);
stmt = NULL;
meta->release();
meta = NULL;
tra->commit(&status);
tra = NULL;
att->detach(&status);
att = NULL;
}
catch (const FbException& error)
{
// handle error
rc = 1;
char buf[256];
master->getUtilInterface()->formatStatus(buf, sizeof(buf), error.getStatus());
fprintf(stderr, "%s\n", buf);
}
// release interfaces after error caught
if (meta)
meta->release();
if (builder)
builder->release();
if (curs)
curs->release();
if (stmt)
stmt->release();
if (tra)
tra->release();
if (att)
att->release();
if (tpb)
tpb->dispose();
prov->release();
status.dispose();
return rc;
}