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Some work on indexes/write support. Bug fixes. Preliminary temp table/worktable work.

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This commit is contained in:
brianb
2004-01-09 21:05:56 +00:00
parent 09ec4202dd
commit d39cc57b44
9 changed files with 315 additions and 93 deletions
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79
src/libmdb/write.c
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@@ -246,7 +246,7 @@ int i;
/* column is null is bit is clear (0) */
if (!fields[i].is_null) {
byte |= 1 << bit;
printf("%d %d %d %d\n", i, bit, 1 << bit, byte);
//printf("%d %d %d %d\n", i, bit, 1 << bit, byte);
}
bit++;
if (bit==8) {
@@ -302,9 +302,48 @@ mdb_update_indexes(MdbTableDef *table, int num_fields, MdbField *fields)
#if MDB_DEBUG_WRITE
fprintf(stderr,"Updating %s (%d).\n", idx->name, idx->index_type);
#endif
if (idx->index_type==1) {
mdb_update_index(table, idx, num_fields, fields);
}
}
}
mdb_init_index_chain(MdbTableDef *table, MdbIndex *idx)
{
MdbCatalogEntry *entry = table->entry;
MdbHandle *mdb = entry->mdb;
table->scan_idx = idx;
table->chain = g_malloc0(sizeof(MdbIndexChain));
table->mdbidx = mdb_clone_handle(mdb);
mdb_read_pg(table->mdbidx, table->scan_idx->first_pg);
}
int
mdb_update_index(MdbTableDef *table, MdbIndex *idx, int num_fields, MdbField *fields)
{
int idx_xref[16];
int i, j;
for (i = 0; i < idx->num_keys; i++) {
for (j = 0; j < num_fields; j++) {
// key_col_num is 1 based, can't remember why though
if (fields[j].colnum == idx->key_col_num[i]-1)
idx_xref[i] = j;
}
}
for (i = 0; i < idx->num_keys; i++) {
fprintf(stdout, "key col %d (%d) is mapped to field %d (%d %d)\n",
i, idx->key_col_num[i], idx_xref[i], fields[idx_xref[i]].colnum,
fields[idx_xref[i]].siz);
}
for (i = 0; i < num_fields; i++) {
fprintf(stdout, "%d (%d %d)\n",
i, fields[i].colnum,
fields[i].siz);
}
//mdb_find_leaf_pg();
}
int
mdb_insert_row(MdbTableDef *table, int num_fields, MdbField *fields)
{
@@ -330,11 +369,39 @@ mdb_insert_row(MdbTableDef *table, int num_fields, MdbField *fields)
return 0;
}
mdb_add_row_to_pg(table, row_buffer, new_row_size);
#if MDB_DEBUG_WRITE
buffer_dump(mdb->pg_buf, 0, 39);
buffer_dump(mdb->pg_buf, fmt->pg_size - 160, fmt->pg_size-1);
fprintf(stdout, "writing page %d\n", pgnum);
#endif
if (!mdb_write_pg(mdb, pgnum)) {
fprintf(stderr, "write failed! exiting...\n");
exit(1);
}
mdb_update_indexes(table, num_fields, fields);
}
/*
* Assumes caller has verfied space is available on page and adds the new
* row to the current pg_buf.
*/
void
mdb_add_row_to_pg(MdbTableDef *table, unsigned char *row_buffer, int new_row_size)
{
unsigned char *new_pg;
int num_rows, i, pos, row_start, row_end, row_size;
MdbCatalogEntry *entry = table->entry;
MdbHandle *mdb = entry->mdb;
MdbFormatConstants *fmt = mdb->fmt;
new_pg = mdb_new_data_pg(entry);
num_rows = mdb_pg_get_int16(mdb, fmt->row_count_offset);
pos = mdb->fmt->pg_size;
/* copy existing rows */
for (i=0;i<num_rows;i++) {
row_start = mdb_pg_get_int16(mdb, (fmt->row_count_offset + 2) + (i*2));
row_end = mdb_find_end_of_row(mdb, i);
@@ -347,19 +414,19 @@ mdb_insert_row(MdbTableDef *table, int num_fields, MdbField *fields)
/* add our new row */
pos -= new_row_size;
memcpy(&new_pg[pos], row_buffer, new_row_size);
/* add row to the row offset table */
_mdb_put_int16(new_pg, (fmt->row_count_offset + 2) + (num_rows*2), pos);
/* update number rows on this page */
num_rows++;
_mdb_put_int16(new_pg, fmt->row_count_offset, num_rows);
/* copy new page over old */
memcpy(mdb->pg_buf, new_pg, fmt->pg_size);
g_free(new_pg);
#if MDB_DEBUG_WRITE
buffer_dump(mdb->pg_buf, 0, 39);
buffer_dump(mdb->pg_buf, fmt->pg_size - 160, fmt->pg_size-1);
#endif
mdb_update_indexes(table, num_fields, fields);
/* update the freespace */
_mdb_put_int16(mdb->pg_buf, 2, mdb_pg_get_freespace(mdb));
}
int
mdb_update_row(MdbTableDef *table)