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sm_manager.cc
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//
// File: sm_manager.cc
// Description: SM_Manager class implementation
// Author: Hyunjung Park ([email protected])
//
#include "sm_internal.h"
#include <cstdio>
using namespace std;
//
// SM_Manager
//
// Desc: Constructor
//
SM_Manager::SM_Manager(IX_Manager &ixm, RM_Manager &rmm)
{
// Set the associated {IX|RM}_Manager object
pIxm = &ixm;
pRmm = &rmm;
//
useIndexNo = -1;
}
//
// ~SM_Manager
//
// Desc: Destructor
//
SM_Manager::~SM_Manager()
{
// Clear the associated {IX|RM}_Manager object
pIxm = NULL;
pRmm = NULL;
}
//
// OpenDb
//
// Desc: Open a DB
// In: dbName - name of DB to open
// Ret: SM_INVALIDDBNAME, SM_CHDIRFAILED, RM return code
//
RC SM_Manager::OpenDb(const char *dbName)
{
RC rc;
// Sanity Check: Length of the argument should be less than MAXDBNAME
// DBname cannot contain ' ' or '/'
if (strlen(dbName) > MAXDBNAME
|| strchr(dbName, ' ') || strchr(dbName, '/')) {
rc = SM_INVALIDDBNAME;
goto err_return;
}
// Change the working directory
if (chdir(dbName) < 0) {
rc = SM_CHDIRFAILED;
goto err_return;
}
// Open a file scan for RELCAT
if (rc = pRmm->OpenFile(RELCAT, fhRelcat))
goto err_return;
// Open a file scan for ATTRCAT
if (rc = pRmm->OpenFile(ATTRCAT, fhAttrcat))
goto err_close;
// Return ok
return (0);
// Return error
err_close:
pRmm->CloseFile(fhRelcat);
err_return:
return (rc);
}
//
// CloseDb
//
// Desc: Close a DB
// Ret: RM return code
//
RC SM_Manager::CloseDb()
{
RC rc;
// Close a file scan for ATTRCAT
if (rc = pRmm->CloseFile(fhAttrcat))
goto err_close;
// Close a file scan for RELCAT
if (rc = pRmm->CloseFile(fhRelcat))
goto err_return;
// Return ok
return (0);
// Return error
err_close:
pRmm->CloseFile(fhRelcat);
err_return:
return (rc);
}
//
// CreateTable
//
// Desc: Create a table
// In: relName -
// attrCount -
// attributes -
// Ret: SM_INVALIDRELNAME, SM_DUPLICATEDATTR, SM_RELEXISTS, RM return code
//
RC SM_Manager::CreateTable(const char *relName,
int attrCount, AttrInfo *attributes)
{
RC rc;
RM_Record tmpRec;
char *relcatData;
int tupleLength = 0;
int offset = 0;
SM_RelcatRec relcatRec;
SM_AttrcatRec attrcatRec;
RID rid;
// Sanity Check: relName should not be RELCAT or ATTRCAT
if (strcmp(relName, RELCAT) == 0 || strcmp(relName, ATTRCAT) == 0) {
rc = SM_INVALIDRELNAME;
goto err_return;
}
// Compute tupleLength by summing up attrLength
// Sanity Check: duplicated attribute names
for (int i = 0; i < attrCount; i++) {
tupleLength += attributes[i].attrLength;
for (int j = i + 1; j < attrCount; j++) {
if (strcmp(attributes[i].attrName, attributes[j].attrName) == 0) {
rc = SM_DUPLICATEDATTR;
goto err_return;
}
}
}
// Sanity Check: relName should not exist
if ((rc = GetRelationInfo(relName, tmpRec, relcatData)) != SM_RELNOTFOUND) {
rc = (rc == 0) ? SM_RELEXISTS : rc;
goto err_return;
}
// Update RELCAT
SM_SetRelcatRec(relcatRec, relName, tupleLength, attrCount, 0);
if (rc = fhRelcat.InsertRec((char *)&relcatRec, rid))
goto err_return;
if (rc = fhRelcat.ForcePages())
goto err_return;
// Update ATTRCAT
for (int i = 0; i < attrCount; i++) {
SM_SetAttrcatRec(attrcatRec,
relName, attributes[i].attrName, offset,
attributes[i].attrType, attributes[i].attrLength, -1);
offset += attributes[i].attrLength;
if (rc = fhAttrcat.InsertRec((char *)&attrcatRec, rid))
goto err_return;
}
if (rc = fhAttrcat.ForcePages())
goto err_return;
// Create file
if (rc = pRmm->CreateFile(relName, tupleLength))
goto err_return;
// Return ok
return (0);
// Return error
err_return:
return (rc);
}
//
// DropTable
//
// Desc: Drop a table
// In: relName -
// Ret: SM_INVALIDRELNAME, SM_RELNOTFOUND, RM return code
//
RC SM_Manager::DropTable(const char *relName)
{
RC rc;
RM_Record rec, _rec;
char *relcatData;
RID rid;
char _relName[MAXNAME];
RM_FileScan fs;
int i = 0;
// Sanity Check: relName should not be RELCAT or ATTRCAT
if (strcmp(relName, RELCAT) == 0 || strcmp(relName, ATTRCAT) == 0) {
rc = SM_INVALIDRELNAME;
goto err_return;
}
// Update RELCAT
if (rc = GetRelationInfo(relName, rec, relcatData))
goto err_return;
if (rc = rec.GetRid(rid))
goto err_return;
if (rc = fhRelcat.DeleteRec(rid))
goto err_return;
if (rc = fhRelcat.ForcePages())
goto err_return;
// Update ATTRCAT
memset(_relName, '\0', sizeof(_relName));
strncpy(_relName, relName, MAXNAME);
if (rc = fs.OpenScan(fhAttrcat, STRING, MAXNAME,
OFFSET(SM_AttrcatRec, relName), EQ_OP, _relName))
goto err_return;
while ((rc = fs.GetNextRec(_rec)) != RM_EOF) {
char *attrcatData;
if (rc != 0)
goto err_closescan;
// Delete the index on this attribute, if any
if (rc = _rec.GetData(attrcatData))
goto err_closescan;
if (((SM_AttrcatRec *)attrcatData)->indexNo != -1)
pIxm->DestroyIndex(relName,((SM_AttrcatRec *)attrcatData)->indexNo);
// Delete the record from ATTRCAT
if (rc = _rec.GetRid(rid))
goto err_closescan;
if (rc = fhAttrcat.DeleteRec(rid))
goto err_closescan;
if (++i == ((SM_RelcatRec *)relcatData)->attrCount)
break;
}
if (rc = fs.CloseScan())
goto err_return;
if (rc = fhAttrcat.ForcePages())
goto err_return;
// Destroy file
if (rc = pRmm->DestroyFile(relName))
goto err_return;
// Return ok
return (0);
// Return error
err_closescan:
fs.CloseScan();
err_return:
return (rc);
}
//
// CreateIndex
//
// Desc:
// In: relName -
// attrName -
// Ret: SM_ATTRNOTFOUND, SM_INDEXEXISTS, IX return code
//
RC SM_Manager::CreateIndex(const char *relName, const char *attrName)
{
RC rc;
RM_Record rec;
char *attrcatData;
int indexNo = -1;
RM_FileScan fs;
RM_FileHandle fh;
RM_Record dataRec;
IX_IndexHandle ih;
// Sanity Check: relName/attrName should exist, but its index should not
if (rc = GetAttributeInfo(relName, attrName, rec, attrcatData))
goto err_return;
if (((SM_AttrcatRec *)attrcatData)->indexNo != -1) {
rc = SM_INDEXEXISTS;
goto err_return;
}
// Determine indexNo
indexNo = ((SM_AttrcatRec *)attrcatData)->offset;
// Build index
if (rc = pIxm->CreateIndex(relName, indexNo,
((SM_AttrcatRec *)attrcatData)->attrType,
((SM_AttrcatRec *)attrcatData)->attrLength))
goto err_return;
if (rc = pIxm->OpenIndex(relName, indexNo, ih))
goto err_destroyindex;
if (rc = pRmm->OpenFile(relName, fh))
goto err_closeindex;
if (rc = fs.OpenScan(fh, INT, sizeof(int), 0, NO_OP, NULL))
goto err_closefile;
while ((rc = fs.GetNextRec(dataRec)) != RM_EOF) {
char *data;
RID rid;
if (rc != 0)
goto err_closescan;
if (rc = dataRec.GetData(data))
goto err_closescan;
if (rc = dataRec.GetRid(rid))
goto err_closescan;
if (rc = ih.InsertEntry(data + ((SM_AttrcatRec *)attrcatData)->offset, rid))
goto err_closescan;
}
if (rc = fs.CloseScan())
goto err_closefile;
if (rc = pRmm->CloseFile(fh))
goto err_closeindex;
if (rc = pIxm->CloseIndex(ih))
goto err_destroyindex;
// Update indexNo
((SM_AttrcatRec *)attrcatData)->indexNo = indexNo;
if (rc = fhAttrcat.UpdateRec(rec))
goto err_return;
if (rc = fhAttrcat.ForcePages())
goto err_return;
// Update RELCAT
if (rc = SetRelationIndexCount(relName, +1))
goto err_return;
// Return ok
return (0);
// Return error
err_closescan:
fs.CloseScan();
err_closefile:
pRmm->CloseFile(fh);
err_closeindex:
pIxm->CloseIndex(ih);
err_destroyindex:
pIxm->DestroyIndex(relName, indexNo);
err_return:
return (rc);
}
//
// DropIndex
//
// Desc:
// In: relName -
// attrName -
// Ret: SM_ATTRNOTFOUND, SM_INDEXNOTFOUND, IX return code
//
RC SM_Manager::DropIndex(const char *relName, const char *attrName)
{
RC rc;
RM_Record rec;
char *attrcatData;
RM_FileScan fs;
// Sanity Check: relName/attrName and its index should exist
if (rc = GetAttributeInfo(relName, attrName, rec, attrcatData))
goto err_return;
if (((SM_AttrcatRec *)attrcatData)->indexNo == -1) {
rc = SM_INDEXNOTFOUND;
goto err_return;
}
// Destroy the index file
if (rc = pIxm->DestroyIndex(relName, ((SM_AttrcatRec *)attrcatData)->indexNo))
goto err_return;
// Update indexNo
((SM_AttrcatRec *)attrcatData)->indexNo = -1;
if (rc = fhAttrcat.UpdateRec(rec))
goto err_return;
if (rc = fhAttrcat.ForcePages())
goto err_return;
// Update RELCAT
if (rc = SetRelationIndexCount(relName, -1))
goto err_return;
// Return ok
return (0);
// Return error
err_return:
return (rc);
}
//
// Load
//
// Desc:
// In: relName -
// fileName -
// Ret: SM_RELNOTFOUND, RM return code
//
RC SM_Manager::Load(const char *relName, const char *fileName)
{
RC rc;
RM_Record tmpRec;
char *relcatData;
char _relName[MAXNAME];
SM_AttrcatRec *attributes;
IX_IndexHandle *ihs;
RM_FileHandle fh;
RM_FileScan fs;
RM_Record rec;
char *data;
FILE *fp;
char *buf;
int i = 0;
// Sanity Check: relName should not be RELCAT or ATTRCAT
if (strcmp(relName, RELCAT) == 0 || strcmp(relName, ATTRCAT) == 0) {
rc = SM_INVALIDRELNAME;
goto err_return;
}
// Get the attribute count
if (rc = GetRelationInfo(relName, tmpRec, relcatData))
goto err_return;
// Allocate indexhandle array
ihs = new IX_IndexHandle[((SM_RelcatRec *)relcatData)->attrCount];
if (ihs == NULL) {
rc = SM_NOMEM;
goto err_return;
}
// Allocate attributes array
attributes = new SM_AttrcatRec[((SM_RelcatRec *)relcatData)->attrCount];
if (attributes == NULL) {
rc = SM_NOMEM;
goto err_deleteihs;
}
// Allocate buffer
buf = new char[MAXLINE];
if (buf == NULL) {
rc = SM_NOMEM;
goto err_deleteattributes;
}
// Allocate data
data = new char[((SM_RelcatRec *)relcatData)->tupleLength];
if (data == NULL) {
rc = SM_NOMEM;
goto err_deletebuf;
}
// Open a file scan for ATTRCAT
memset(_relName, '\0', sizeof(_relName));
strncpy(_relName, relName, MAXNAME);
if (rc = fs.OpenScan(fhAttrcat, STRING, MAXNAME,
OFFSET(SM_AttrcatRec, relName), EQ_OP, _relName))
goto err_deletedata;
// Fill out attributes array
while ((rc = fs.GetNextRec(rec)) != RM_EOF) {
char *_data;
if (rc != 0) {
fs.CloseScan();
goto err_deletedata;
}
if (rc = rec.GetData(_data)) {
fs.CloseScan();
goto err_deletedata;
}
memcpy(&attributes[i], _data, sizeof(SM_AttrcatRec));
if (++i == ((SM_RelcatRec *)relcatData)->attrCount)
break;
}
// Close a file scan for ATTRCAT
if (rc = fs.CloseScan())
goto err_deletedata;
// Open data file
fp = fopen(fileName, "r");
if (fp == NULL) {
rc = SM_FILEIOFAILED;
goto err_deletedata;
}
// Open relation file
if (rc = pRmm->OpenFile(relName, fh))
goto err_fclose;
// Open indexes
for (i = 0; i < ((SM_RelcatRec *)relcatData)->attrCount; i++) {
if (attributes[i].indexNo == -1)
continue;
if (rc = pIxm->OpenIndex(relName, attributes[i].indexNo, ihs[i]))
goto err_closeindexes;
}
// Process every line
while (fgets(buf, MAXLINE, fp)) {
int numDelim = 0;
char *attr = buf;
RID rid;
// Count commas and confirm the whole line was read
for (i = 0; i < MAXLINE - 1; i++) {
if (buf[i] == '\n')
break;
else if (buf[i] == ',')
numDelim++;
}
// Allow blank lines
if (i == 0)
continue;
if (buf[i] != '\n' || buf[i+1] != '\0'
|| numDelim + 1 != ((SM_RelcatRec *)relcatData)->attrCount) {
rc = SM_INVALIDFORMAT;
goto err_closeindexes;
}
// Make record data
for (i = 0; i < ((SM_RelcatRec *)relcatData)->attrCount; i++) {
int _i;
float _f;
char *delim = strpbrk(attr, ",\n");
*delim = '\0';
switch (attributes[i].attrType) {
case INT:
_i = atoi(attr);
memcpy(data + attributes[i].offset, &_i, sizeof(int));
break;
case FLOAT:
_f = atof(attr);
memcpy(data + attributes[i].offset, &_f, sizeof(float));
break;
case STRING:
memset(data + attributes[i].offset, '\0',
attributes[i].attrLength);
strncpy(data + attributes[i].offset, attr,
attributes[i].attrLength);
break;
}
attr = delim + 1;
}
// Insert the record
if (rc = fh.InsertRec(data, rid))
goto err_closeindexes;
// Update indexes
for (i = 0; i < ((SM_RelcatRec *)relcatData)->attrCount; i++) {
if (attributes[i].indexNo == -1)
continue;
if (rc = ihs[i].InsertEntry(data + attributes[i].offset, rid))
goto err_closeindexes;
}
}
// Close indexes
for (i = 0; i < ((SM_RelcatRec *)relcatData)->attrCount; i++) {
if (attributes[i].indexNo == -1)
continue;
if (rc = pIxm->CloseIndex(ihs[i]))
goto err_closeindexes;
}
// Close relation file
if (rc = pRmm->CloseFile(fh))
goto err_fclose;
// Close data file
fclose(fp);
// Deallocate
delete [] data;
delete [] buf;
delete [] attributes;
delete [] ihs;
// Return ok
return (0);
// Return error
err_closeindexes:
for (i = 0; i < ((SM_RelcatRec *)relcatData)->attrCount; i++)
if (attributes[i].indexNo != -1)
pIxm->CloseIndex(ihs[i]);
//err_closefile:
pRmm->CloseFile(fh);
err_fclose:
fclose(fp);
err_deletedata:
delete [] data;
err_deletebuf:
delete [] buf;
err_deleteattributes:
delete [] attributes;
err_deleteihs:
delete [] ihs;
err_return:
return (rc);
}
//
// compareDataAttrInfo
//
// Desc: for qsort
//
static int compareDataAttrInfo(const void *p1, const void *p2)
{
int offset1 = ((DataAttrInfo *)p1)->offset;
int offset2 = ((DataAttrInfo *)p2)->offset;
return offset1 - offset2;
}
//
// Print
//
// Desc:
// In: relName -
// Ret: SM_RELNOTFOUND, RM return code
//
RC SM_Manager::Print(const char *relName)
{
RC rc;
RM_Record tmpRec;
char *relcatData;
DataAttrInfo *attributes;
char _relName[MAXNAME];
RM_FileScan fs;
RM_Record rec;
RM_FileHandle fh;
int i = 0;
// Get the attribute count
if (rc = GetRelationInfo(relName, tmpRec, relcatData))
return (rc);
// Allocate attributes array
attributes = new DataAttrInfo[((SM_RelcatRec *)relcatData)->attrCount];
if (attributes == NULL)
return (SM_NOMEM);
// Open a file scan for ATTRCAT
memset(_relName, '\0', sizeof(_relName));
strncpy(_relName, relName, MAXNAME);
if (rc = fs.OpenScan(fhAttrcat, STRING, MAXNAME,
OFFSET(SM_AttrcatRec, relName), EQ_OP, _relName)) {
delete [] attributes;
return (rc);
}
// Fill out attributes array
while ((rc = fs.GetNextRec(rec)) != RM_EOF) {
char *data;
if (rc != 0) {
fs.CloseScan();
delete [] attributes;
return (rc);
}
if (rc = rec.GetData(data)) {
fs.CloseScan();
delete [] attributes;
return (rc);
}
SM_SetAttrcatRec(attributes[i],
((SM_AttrcatRec *)data)->relName,
((SM_AttrcatRec *)data)->attrName,
((SM_AttrcatRec *)data)->offset,
((SM_AttrcatRec *)data)->attrType,
((SM_AttrcatRec *)data)->attrLength,
((SM_AttrcatRec *)data)->indexNo);
if (++i == ((SM_RelcatRec *)relcatData)->attrCount)
break;
}
// Close a file scan for ATTRCAT
if (rc = fs.CloseScan()) {
delete [] attributes;
return (rc);
}
// Instantiate a Printer object
qsort(attributes, ((SM_RelcatRec *)relcatData)->attrCount,
sizeof(DataAttrInfo), compareDataAttrInfo);
Printer p(attributes, ((SM_RelcatRec *)relcatData)->attrCount);
// Open relation file
if (rc = pRmm->OpenFile(relName, fh))
goto err_delete;
// Print the header information
p.PrintHeader(cout);
// Normal Print
if (useIndexNo < 0) {
if (rc = fs.OpenScan(fh, INT, sizeof(int), 0, NO_OP, NULL))
goto err_closefile;
while ((rc = fs.GetNextRec(rec)) != RM_EOF) {
char *data;
if (rc != 0)
goto err_closescan;
if (rc = rec.GetData(data))
goto err_closescan;
p.Print(cout, data);
}
if (rc = fs.CloseScan())
goto err_closefile;
}
// Sorted Print
else {
IX_IndexHandle ih;
IX_IndexScan is;
RID rid;
if (rc = pIxm->OpenIndex(relName, useIndexNo, ih))
goto err_closefile;
if (rc = is.OpenScan(ih, NO_OP, NULL)) {
pIxm->CloseIndex(ih);
goto err_closefile;
}
while ((rc = is.GetNextEntry(rid)) != IX_EOF) {
char *data;
if (rc != 0) {
is.CloseScan();
pIxm->CloseIndex(ih);
goto err_closefile;
}
if (rc = fh.GetRec(rid, rec)) {
is.CloseScan();
pIxm->CloseIndex(ih);
goto err_closefile;
}
if (rc = rec.GetData(data))
goto err_closescan;
p.Print(cout, data);
}
if (rc = is.CloseScan()) {
pIxm->CloseIndex(ih);
goto err_closefile;
}
if (rc = pIxm->CloseIndex(ih))
goto err_closefile;
}
// Print the footer information
p.PrintFooter(cout);
// Close relation file
if (rc = pRmm->CloseFile(fh))
goto err_delete;
// Deallocate attributes
delete [] attributes;
// Return ok
return (0);
// Return error
err_closescan:
fs.CloseScan();
err_closefile:
pRmm->CloseFile(fh);
err_delete:
delete [] attributes;
//err_return:
return (rc);
}
//
// Set
//
// Desc:
// In: paramName -
// value -
// Ret:
//
RC SM_Manager::Set(const char *paramName, const char *value)
{
if (strcasecmp(paramName, "useindex") == 0)
useIndexNo = atoi(value);
else
return (SM_PARAMUNDEFINED);
// Return ok
return (0);
}
//
// Help
//
// Desc:
// Ret: RM return code
//
RC SM_Manager::Help()
{
RC rc;
DataAttrInfo attributes[4];
RM_FileScan fs;
RM_Record rec;
// Instantiate a Printer object
SM_SetAttrcatRec(attributes[0],
RELCAT, "relName", OFFSET(SM_RelcatRec, relName),
STRING, MAXNAME, -1);
SM_SetAttrcatRec(attributes[1],
RELCAT, "tupleLength", OFFSET(SM_RelcatRec, tupleLength),
INT, sizeof(int), -1);
SM_SetAttrcatRec(attributes[2],
RELCAT, "attrCount", OFFSET(SM_RelcatRec, attrCount),
INT, sizeof(int), -1);
SM_SetAttrcatRec(attributes[3],
RELCAT, "indexCount", OFFSET(SM_RelcatRec, indexCount),
INT, sizeof(int), -1);
Printer p(attributes, 4);
// Open a file scan for RELCAT
if (rc = fs.OpenScan(fhRelcat, INT, sizeof(int), 0, NO_OP, NULL))
goto err_return;
// Print the header information
p.PrintHeader(cout);
// Print each tuple
while ((rc = fs.GetNextRec(rec)) != RM_EOF) {
char *data;
if (rc != 0)
goto err_closescan;
if (rc = rec.GetData(data))
goto err_closescan;
p.Print(cout, data);
}
// Print the footer information
p.PrintFooter(cout);
// Close a file scan for RELCAT
if (rc = fs.CloseScan())
goto err_return;
// Return ok
return (0);
// Return error
err_closescan:
fs.CloseScan();
err_return:
return (rc);
}
//
// Help
//
// Desc:
// In: relName -
// Ret: SM_RELNOTFOUND, RM return code
//
RC SM_Manager::Help(const char *relName)
{
RC rc;
RM_Record tmpRec;
char *relcatData;
DataAttrInfo attributes[6];
char _relName[MAXNAME];
RM_FileScan fs;
RM_Record rec;
int i = 0;
// Get the attribute count
if (rc = GetRelationInfo(relName, tmpRec, relcatData))
return (rc);
// Instantiate a Printer object
SM_SetAttrcatRec(attributes[0],
ATTRCAT, "relName", OFFSET(SM_AttrcatRec, relName),
STRING, MAXNAME, -1);
SM_SetAttrcatRec(attributes[1],
ATTRCAT, "attrName", OFFSET(SM_AttrcatRec, attrName),
STRING, MAXNAME, -1);
SM_SetAttrcatRec(attributes[2],
ATTRCAT, "offset", OFFSET(SM_AttrcatRec, offset),
INT, sizeof(int), -1);
SM_SetAttrcatRec(attributes[3],
ATTRCAT, "attrType", OFFSET(SM_AttrcatRec, attrType),
INT, sizeof(int), -1);
SM_SetAttrcatRec(attributes[4],
ATTRCAT, "attrLength", OFFSET(SM_AttrcatRec, attrLength),
INT, sizeof(int), -1);
SM_SetAttrcatRec(attributes[5],
ATTRCAT, "indexNo", OFFSET(SM_AttrcatRec, indexNo),
INT, sizeof(int), -1);
Printer p(attributes, 6);
// Open a file scan for ATTRCAT
memset(_relName, '\0', sizeof(_relName));
strncpy(_relName, relName, MAXNAME);
if (rc = fs.OpenScan(fhAttrcat, STRING, MAXNAME,
OFFSET(SM_AttrcatRec, relName), EQ_OP, _relName))
goto err_return;
// Print the header information
p.PrintHeader(cout);
// Print each tuple
while ((rc = fs.GetNextRec(rec)) != RM_EOF) {
char *data;
if (rc != 0)
goto err_closescan;
if (rc = rec.GetData(data))
goto err_closescan;
p.Print(cout, data);
if (++i == ((SM_RelcatRec *)relcatData)->attrCount)
break;
}
// Print the footer information
p.PrintFooter(cout);
// Close a file scan for ATTRCAT
if (rc = fs.CloseScan())
goto err_return;
// Return ok
return (0);
// Return error
err_closescan:
fs.CloseScan();
err_return:
return (rc);
}
//
// GetRelationInfo
//
// Desc: Get relation informtion by accessing catalog RELCAT
// In: relName -
// Out: rec -
// data -
// Ret: SM_RELNOTFOUND, RM return code
//
RC SM_Manager::GetRelationInfo(const char *relName,
RM_Record &rec, char *&data)
{
RC rc;
char _relName[MAXNAME];
RM_FileScan fs;
// Open a file scan for RELCAT
memset(_relName, '\0', sizeof(_relName));
strncpy(_relName, relName, MAXNAME);
if (rc = fs.OpenScan(fhRelcat, STRING, MAXNAME,
OFFSET(SM_RelcatRec, relName), EQ_OP, _relName))
goto err_return;
// Find the matching record
if (rc = fs.GetNextRec(rec)) {
rc = (rc == RM_EOF) ? SM_RELNOTFOUND : rc;
goto err_closescan;
} else {
if (rc = rec.GetData(data))