/*
* This function is used to update a Record,
* updating on a deleted page is not possible
*/
RC updateRecord (RM_TableData *rel, Record *record)
{
//Find the data to be updated
if(record->id.page > 0 && record->id.page <= totalPages)
{
BM_PageHandle *page = MAKE_PAGE_HANDLE();
int pageNum, slotNum;
// Setting record id and slot number
pageNum = record->id.page;
slotNum = record->id.slot;
//Compare if the record is a deleted Record,
//return update not possible for deleted records (EC 401)
if(strncmp(record->data, "DELETED_RECORD", 14) == 0)
return RC_RM_UPDATE_NOT_POSSIBLE_ON_DELETED_RECORD;
//Take the serailized updated record data
char *record_str = serializeRecord(record, rel->schema);
//pin page
pinPage(((RM_RecordMgmt *)rel->mgmtData)->bm, page, record->id.page);
//set the new fields, or the entire modified page
memset(page->data, '\0', strlen(page->data));
sprintf(page->data, "%s", record_str);
//free the temp data
free(record_str);
//mark the page as dirty
markDirty(((RM_RecordMgmt *)rel->mgmtData)->bm, page);
//unpin the page, after use
unpinPage(((RM_RecordMgmt *)rel->mgmtData)->bm, page);
//force write onto the page, as it is modified page now
forcePage(((RM_RecordMgmt *)rel->mgmtData)->bm, page);
//printf("record data in update: %s\n", page->data);
free(page); //free page, avoid leaks
return RC_OK;
}
else
{
return RC_RM_NO_MORE_TUPLES; //return the data to be modfied not found
}
return RC_OK;
}
void pageOperations(recordTableInfo *table, int pageNum, int slot,
RM_TableData *rel, Record *record) {
BM_PageHandle *pageHandle=NULL;
pageHandle = getBuffPageHandle();
char *strRecord,*tempData;
strRecord = serializeRecord(record, rel->schema);
if(pinPage(table->bufferManager, pageHandle, pageNum)==RC_OK)
strncpy(pageHandle->data + (slot * table->slotSize), strRecord,
strlen(strRecord));
markDirty(table->bufferManager, pageHandle);
unpinPage(table->bufferManager, pageHandle);
if(forcePage(table->bufferManager, pageHandle)==RC_OK)
record->id.tombS = false;
table->numOfRecords = table->numOfRecords + 1;
tableInfoDetailsToFileData(rel->name, tempData, table);
free(pageHandle);
free(strRecord);
}
char *
serializeTableContent(RM_TableData *rel) {
int i;
VarString *result;
RM_ScanHandle *sc = (RM_ScanHandle *) malloc(sizeof(RM_ScanHandle));
Record *r = (Record *) malloc(sizeof(Record));
MAKE_VARSTRING(result);
for (i = 0; i < rel->schema->numAttr; i++)
APPEND(result, "%s%s", (i != 0) ? ", " : "", rel->schema->attrNames[i]);
startScan(rel, sc, NULL);
while (next(sc, r) != RC_RM_NO_MORE_TUPLES) {
APPEND_STRING(result, serializeRecord(r, rel->schema));
APPEND_STRING(result, "\n");
}
closeScan(sc);
RETURN_STRING(result);
}
void testScansTwo (void)
{
RM_TableData *table = (RM_TableData *) malloc(sizeof(RM_TableData));
TestRecord inserts[] = {
{1, "aaaa", 3},
{2, "bbbb", 2},
{3, "cccc", 1},
{4, "dddd", 3},
{5, "eeee", 5},
{6, "ffff", 1},
{7, "gggg", 3},
{8, "hhhh", 3},
{9, "iiii", 2},
{10, "jjjj", 5},
};
bool foundScan[] = {
FALSE,
FALSE,
FALSE,
FALSE,
FALSE,
FALSE,
FALSE,
FALSE,
FALSE,
FALSE
};
int numInserts = 10, i;
Record *r;
RID *rids;
Schema *schema;
RM_ScanHandle *sc = (RM_ScanHandle *) malloc(sizeof(RM_ScanHandle));
Expr *sel, *left, *right, *first, *se;
int rc;
testName = "test creating a new table and inserting tuples";
schema = testSchema();
rids = (RID *) malloc(sizeof(RID) * numInserts);
TEST_CHECK(initRecordManager(NULL));
TEST_CHECK(createTable("test_table_r",schema));
TEST_CHECK(openTable(table, "test_table_r"));
// insert rows into table
for(i = 0; i < numInserts; i++)
{
r = fromTestRecord(schema, inserts[i]);
TEST_CHECK(insertRecord(table,r));
rids[i] = r->id;
}
TEST_CHECK(closeTable(table));
TEST_CHECK(openTable(table, "test_table_r"));
// Select 1 record with INT in condition a=2.
MAKE_CONS(left, stringToValue("i2"));
MAKE_ATTRREF(right, 0);
MAKE_BINOP_EXPR(sel, left, right, OP_COMP_EQUAL);
createRecord(&r, schema);
TEST_CHECK(startScan(table, sc, sel));
while((rc = next(sc, r)) == RC_OK)
{
ASSERT_EQUALS_RECORDS(fromTestRecord(schema, inserts[1]), r, schema, "compare records");
}
if (rc != RC_NO_TUPLES)
TEST_CHECK(rc);
TEST_CHECK(closeScan(sc));
// Select 1 record with STRING in condition b='ffff'.
MAKE_CONS(left, stringToValue("sffff"));
MAKE_ATTRREF(right, 1);
MAKE_BINOP_EXPR(sel, left, right, OP_COMP_EQUAL);
createRecord(&r, schema);
TEST_CHECK(startScan(table, sc, sel));
while((rc = next(sc, r)) == RC_OK)
{
ASSERT_EQUALS_RECORDS(fromTestRecord(schema, inserts[5]), r, schema, "compare records");
serializeRecord(r, schema);
}
if (rc != RC_NO_TUPLES)
TEST_CHECK(rc);
TEST_CHECK(closeScan(sc));
// Select all records, with condition being false
MAKE_CONS(left, stringToValue("i4"));
MAKE_ATTRREF(right, 2);
MAKE_BINOP_EXPR(first, right, left, OP_COMP_SMALLER);
MAKE_UNOP_EXPR(se, first, OP_BOOL_NOT);
TEST_CHECK(startScan(table, sc, se));
while((rc = next(sc, r)) == RC_OK)
{
serializeRecord(r, schema);
for(i = 0; i < numInserts; i++)
{
if (memcmp(fromTestRecord(schema, inserts[i])->data,r->data,getRecordSize(schema)) == 0)
foundScan[i] = TRUE;
}
}
if (rc != RC_NO_TUPLES)
TEST_CHECK(rc);
TEST_CHECK(closeScan(sc));
ASSERT_TRUE(!foundScan[0], "not greater than four");
ASSERT_TRUE(foundScan[4], "greater than four");
ASSERT_TRUE(foundScan[9], "greater than four");
// clean up
TEST_CHECK(closeTable(table));
TEST_CHECK(deleteTable("test_table_r"));
TEST_CHECK(shutdownRecordManager());
freeRecord(r);
free(table);
free(sc);
freeExpr(sel);
TEST_DONE();
}
/*
* This function is used to insert a new Record into the table
* while inserting, the record Manager assigns a RID to the record
* and update the "record" parameter too
*/
RC insertRecord (RM_TableData *rel, Record *record)
{
//Create a record variable
Record *r = (Record *)malloc(sizeof(Record));
RID rid;
rid.page = 1;
rid.slot = 0;
//Find the next place of insertion of a record
while(rid.page > 0 && rid.page < totalPages)
{
rid.page = rid.page + 1;
rid.slot = 0;
/*getRecord(rel, rid, r); //obtaining the record from the table
//checking for soft delete record in the table space for insertion
if(strncmp(r->data, "DELETED_RECORD", 14) == 0)
break;*/
}
r = NULL;
free(r); //free the memory of r which was just a temporary allocation
//mark the page as free page
((RM_RecordMgmt *)rel->mgmtData)->freePages[0] = rid.page;
//create a page handle
BM_PageHandle *page = MAKE_PAGE_HANDLE();
//assign the record, its RID and slot number
record->id.page = ((RM_RecordMgmt *)rel->mgmtData)->freePages[0];
record->id.slot = 0;
//Serialize the Record to be inserted
char * serializedRecord = serializeRecord(record, rel->schema);
//Pin the record page, to mark that it is in use
pinPage(((RM_RecordMgmt *)rel->mgmtData)->bm, page, ((RM_RecordMgmt *)rel->mgmtData)->freePages[0]);
//insert the new record data, into the Table i.e. Pages of the PageFile
memset(page->data, '\0', strlen(page->data));
sprintf(page->data, "%s", serializedRecord);
//mark the page as Dirty Page, as now there is a new record entry on that page
markDirty(((RM_RecordMgmt *)rel->mgmtData)->bm, page);
//Unpin the page as now it has been used
unpinPage(((RM_RecordMgmt *)rel->mgmtData)->bm, page);
//Force Page to push entire data onto the page
forcePage(((RM_RecordMgmt *)rel->mgmtData)->bm, page);
//printf("record data: %s\n", page->data);
free(page); //free page, avoid memory leaks
((RM_RecordMgmt *)rel->mgmtData)->freePages[0] += 1;
totalPages++;
return RC_OK;
}
