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made looping over data rows easier.

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This commit is contained in:
brianb
2000-03-12 16:37:34 +00:00
parent 6e24e9cb02
commit ec64ee1593
2 changed files with 45 additions and 1 deletions
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2
src/include/mdbtools.h
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@@ -87,6 +87,8 @@ typedef struct {
int num_pgs;
int first_data_pg;
GPtrArray *columns;
int cur_pg;
int cur_row;
} MdbTableDef;
typedef struct {

44
src/libmdb/data.c
View File

@@ -160,18 +160,59 @@ int delflag, lookupflag;
row_end = row_start-1;
}
int mdb_rewind_table(MdbTableDef *table)
{
table->cur_pg=0;
table->cur_row=0;
}
int mdb_fetch_row(MdbTableDef *table)
{
MdbHandle *mdb = table->entry->mdb;
int rows;
if (table->cur_pg > table->num_pgs) {
return 0;
}
if (!table->cur_pg) {
table->cur_pg=1;
table->cur_row=0;
mdb_read_pg(mdb,table->first_data_pg + table->cur_pg);
}
rows = mdb_get_int16(mdb,8);
mdb_read_row(table,
table->first_data_pg + table->cur_pg,
table->cur_row);
table->cur_row++;
if (table->cur_row >= rows) {
table->cur_row=0;
table->cur_pg++;
if (table->cur_pg <= table->num_pgs) {
mdb_read_pg(mdb,table->first_data_pg + table->cur_pg);
}
}
return 1;
}
void mdb_data_dump(MdbTableDef *table)
{
MdbHandle *mdb = table->entry->mdb;
int i, j, pg_num;
int rows;
char *bound_values[256]; /* warning doesn't handle table > 256 columns. Can that happen? */
char *bound_values[256]; /* warning doesn't handle tables > 256 columns. Can that happen? */
for (i=0;i<table->num_cols;i++) {
bound_values[i] = (char *) malloc(256);
mdb_bind_column(table, i+1, bound_values[i]);
}
mdb_rewind_table(table);
while (mdb_fetch_row(table)) {
for (j=0;j<table->num_cols;j++) {
fprintf(stdout, "column %d is %s\n", j+1, bound_values[j]);
}
}
#if 0
for (pg_num=1;pg_num<=table->num_pgs;pg_num++) {
mdb_read_pg(mdb,table->first_data_pg + pg_num);
rows = mdb_get_int16(mdb,8);
@@ -185,6 +226,7 @@ char *bound_values[256]; /* warning doesn't handle table > 256 columns. Can tha
}
}
}
#endif
for (i=0;i<table->num_cols;i++) {
free(bound_values[i]);
}