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Added (premilinary) support for null columns.

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Added support routines for C files generated by parsecsv utilities.
This commit is contained in:
brianb
2000-03-19 02:50:05 +00:00
parent 5a4f0eefcd
commit 401e3f45e3
5 changed files with 69 additions and 45 deletions
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84
src/libmdb/data.c
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@@ -43,11 +43,35 @@ int rows, row_end;
return row_end;
}
int mdb_read_row(MdbTableDef *table, int pg_num, int row)
static int mdb_is_null(unsigned char *null_mask, int col_num)
{
int byte_num = (col_num - 1) / 8;
int bit_num = (col_num - 1) % 8;
if ((1 << bit_num) & null_mask[byte_num]) {
return 0;
} else {
return 1;
}
}
static int mdb_xfer_bound_data(MdbHandle *mdb, int start, MdbColumn *col, int len)
{
if (col->bind_ptr) {
if (len) {
strcpy(col->bind_ptr,
mdb_col_to_string(mdb, start, col->col_type, len));
return col->col_size;
} else {
strcpy(col->bind_ptr, "");
}
}
return 0;
}
int mdb_read_row(MdbTableDef *table, int row)
{
MdbHandle *mdb = table->entry->mdb;
MdbColumn *col;
int j;
int i, j;
int num_cols, var_cols, fixed_cols;
int row_start, row_end;
int fixed_cols_found, var_cols_found;
@@ -55,6 +79,7 @@ int col_start, len;
int eod; /* end of data */
int delflag, lookupflag;
int bitmask_sz;
unsigned char null_mask[8]; /* 256 columns max / 8 bits per byte */
row_start = mdb_get_int16(mdb, 10+(row*2));
row_end = mdb_find_end_of_row(mdb, row);
@@ -64,8 +89,8 @@ int bitmask_sz;
if (row_start & 0x4000) lookupflag++;
row_start &= 0x0FFF; /* remove flags */
#if DEBUG
fprintf(stdout,"Pg %d Row %d bytes %d to %d %s %s\n",
pg_num, row, row_start, row_end,
fprintf(stdout,"Row %d bytes %d to %d %s %s\n",
row, row_start, row_end,
lookupflag ? "[lookup]" : "",
delflag ? "[delflag]" : "");
#endif
@@ -91,6 +116,9 @@ int bitmask_sz;
}
bitmask_sz = (num_cols - 1) / 8 + 1;
eod = mdb->pg_buf[row_end-1-var_cols-bitmask_sz];
for (i=0;i<bitmask_sz;i++) {
null_mask[i]=mdb->pg_buf[row_end - bitmask_sz + i + 1];
}
#if MDB_DEBUG
fprintf(stdout,"#cols: %-3d #varcols %-3d EOD %-3d\n",
@@ -107,22 +135,11 @@ int bitmask_sz;
col = g_ptr_array_index(table->columns,j);
if (mdb_is_fixed_col(col) &&
++fixed_cols_found <= fixed_cols) {
if (col->bind_ptr) {
strcpy(col->bind_ptr,
mdb_col_to_string(mdb,
row_start + col_start,
col->col_type,
col->col_size)
);
if (mdb_is_null(null_mask, j+1)) {
mdb_xfer_bound_data(mdb, 0, col, 0);
} else {
mdb_xfer_bound_data(mdb,row_start + col_start, col, col->col_size);
}
#if MDB_DEBUG
fprintf(stdout,"fixed col %s = %s\n",
col->name,
mdb_col_to_string(mdb,
row_start + col_start,
col->col_type,
0));
#endif
col_start += col->col_size;
}
}
@@ -142,29 +159,11 @@ int bitmask_sz;
- var_cols_found
- 1 ] - col_start;
#if MDB_DEBUG
fprintf(stdout,"coltype %d colstart %d len %d\n",
col->col_type,
col_start,
len);
#endif
if (col->bind_ptr) {
strcpy(col->bind_ptr,
mdb_col_to_string(mdb,
row_start + col_start,
col->col_type,
len)
);
if (mdb_is_null(null_mask, j+1)) {
mdb_xfer_bound_data(mdb, 0, col, 0);
} else {
mdb_xfer_bound_data(mdb,row_start + col_start, col, len);
}
#if MDB_DEBUG
fprintf(stdout,"var col %s = %s\n",
col->name,
mdb_col_to_string(mdb,
row_start + col_start,
col->col_type,
len));
#endif
col_start += len;
}
}
@@ -201,7 +200,6 @@ int rows;
rows = mdb_get_int16(mdb,8);
mdb_read_row(table,
table->cur_pg_num,
table->cur_row);
table->cur_row++;
@@ -236,7 +234,7 @@ char *bound_values[256]; /* warning doesn't handle tables > 256 columns. Can th
pg_num + table->first_data_pg,
rows);
for (i=0;i<rows;i++) {
mdb_read_row(table, table->first_data_pg + pg_num, i);
mdb_read_row(table, i);
for (j=0;j<table->num_cols;j++) {
fprintf(stdout, "column %d is %s\n", j+1, bound_values[j]);
}