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mdb-export: Add boolean words option (TRUE/FALSE)

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Adds "-B" (--boolean-words) option to mdb-export, which will reconfigure
mdb/data.c to export TRUE/FALSE for boolean values instead of 1/0.  The
option is needed to support BOOLEAN fields on PostgreSQL, which will not
implicitly cast bare 1/0 into a BOOLEAN value.  Value literals are the
SQL TRUE/FALSE, and _quoted_ words meaning true/false and _quoted_
'1'/'0'.  With this flag the SQL TRUE/FALSE values are output, which should
work with several SQL databases.

PostgreSQL Reference:

http://www.postgresql.org/docs/current/static/datatype-boolean.html
This commit is contained in:
Ewen McNeill 2016-04-07 08:45:06 +12:00
parent 3b6d88f347
commit 8b1db6c08e
3 changed files with 28 additions and 2 deletions
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1
include/mdbtools.h
View File

@ -496,6 +496,7 @@ extern size_t mdb_ole_read_next(MdbHandle *mdb, MdbColumn *col, void *ole_ptr);
extern size_t mdb_ole_read(MdbHandle *mdb, MdbColumn *col, void *ole_ptr, int chunk_size);
extern void* mdb_ole_read_full(MdbHandle *mdb, MdbColumn *col, size_t *size);
extern void mdb_set_date_fmt(const char *);
extern void mdb_set_boolean_fmt_words();
extern int mdb_read_row(MdbTableDef *table, unsigned int row);
/* dump.c */

24
src/libmdb/data.c
View File

@ -44,6 +44,25 @@ void mdb_set_date_fmt(const char *fmt)
strncpy(date_fmt, fmt, 63);
}
/* Some databases (eg PostgreSQL) do not understand integer 0/1 values
* as TRUE/FALSE, so provide a means to override the values used to be
* the SQL Standard TRUE/FALSE values.
*/
static char boolean_false_number[] = "0";
static char boolean_true_number[] = "1";
static char boolean_false_word[] = "FALSE";
static char boolean_true_word[] = "TRUE";
static char *boolean_false_value = boolean_false_number;
static char *boolean_true_value = boolean_true_number;
void mdb_set_boolean_fmt_words()
{
boolean_false_value = boolean_false_word;
boolean_true_value = boolean_true_word;
}
void mdb_bind_column(MdbTableDef *table, int col_num, void *bind_ptr, int *len_ptr)
{
MdbColumn *col;
@ -168,10 +187,11 @@ mdb_xfer_bound_bool(MdbHandle *mdb, MdbColumn *col, int value)
{
col->cur_value_len = value;
if (col->bind_ptr) {
strcpy(col->bind_ptr, value ? "0" : "1");
strcpy(col->bind_ptr,
value ? boolean_false_value : boolean_true_value);
}
if (col->len_ptr) {
*col->len_ptr = 1;
*col->len_ptr = strlen(col->bind_ptr);
}
return 1;

5
src/util/mdb-export.c
View File

@ -89,6 +89,7 @@ main(int argc, char **argv)
char *escape_char = NULL;
int header_row = 1;
int quote_text = 1;
int boolean_words = 0;
char *insert_dialect = NULL;
char *date_fmt = NULL;
char *namespace = NULL;
@ -108,6 +109,7 @@ main(int argc, char **argv)
{ "escape", 'X', 0, G_OPTION_ARG_STRING, &escape_char, "Use <char> to escape quoted characters within a field. Default is doubling.", "format"},
{ "namespace", 'N', 0, G_OPTION_ARG_STRING, &namespace, "Prefix identifiers with namespace", "namespace"},
{ "bin", 'b', 0, G_OPTION_ARG_STRING, &str_bin_mode, "Binary export mode", "strip|raw|octal"},
{ "boolean-words", 'B', 0, G_OPTION_ARG_NONE, &boolean_words, "Use TRUE/FALSE in Boolean fields (default is 0/1)", NULL},
{ NULL },
};
GError *error = NULL;
@ -154,6 +156,9 @@ main(int argc, char **argv)
if (date_fmt)
mdb_set_date_fmt(date_fmt);
if (boolean_words)
mdb_set_boolean_fmt_words();
if (str_bin_mode) {
if (!strcmp(str_bin_mode, "strip"))
bin_mode = MDB_BINEXPORT_STRIP;