static int
set_format_string(struct METADATA * meta, const char separator[])
{
int width;
const char *size_and_width;
assert(meta);
if ((width = get_printable_size(meta->type, meta->size)) == INT_MAX) {
/* TEXT/IMAGE: no attempt to format the column; just splat the data */
meta->format_string = strdup(separator);
return strlen(meta->format_string);
}
/* For anything except the default two-space separator, don't justify the strings. */
if(0 != strcmp(options.colsep, default_colsep)) {
return asprintf(&meta->format_string, "%%s%s", separator);
}
/* Set the printing width large enough for the data or its title, whichever is greater. */
if (width < strlen(meta->name))
width = strlen(meta->name);
/* right justify numbers, left justify strings */
size_and_width = is_character_data(meta->type)? "%%-%d.%ds%s" : "%%%d.%ds%s";
return asprintf(&meta->format_string, size_and_width, width, width, separator);
}
static int
set_format_string(struct METADATA * meta, const char separator[])
{
int width, ret;
const char *size_and_width;
assert(meta);
/* right justify numbers, left justify strings */
size_and_width = is_character_data(meta->type)? "%%-%d.%ds%s" : "%%%d.%ds%s";
width = get_printable_size(meta->type, meta->size);
if (width < strlen(meta->name))
width = strlen(meta->name);
ret = asprintf(&meta->format_string, size_and_width, width, width, separator);
return ret;
}
/**
* Build the column header format string, based on the column width.
* This is just one solution to the question, "How wide should my columns be when I print them out?"
*/
static int
set_format_string(struct METADATA * meta, const char separator[])
{
int width, ret;
const char *size_and_width;
assert(meta);
if(0 == strcmp(options.colsep, default_colsep)) {
/* right justify numbers, left justify strings */
size_and_width = is_character_data(meta->type)? "%%-%d.%ds%s" : "%%%d.%ds%s";
width = meta->width; /* get_printable_size(meta->type, meta->size); */
if (width < strlen(meta->name))
width = strlen(meta->name);
ret = asprintf(&meta->format_string, size_and_width, width, width, separator);
} else {
/* For anything except the default two-space separator, don't justify the strings. */
ret = asprintf(&meta->format_string, "%%s%s", separator);
}
return ret;
}
static void
print_results(SQLHSTMT hStmt)
{
static const char dashes[] = "----------------------------------------------------------------" /* each line is 64 */
"----------------------------------------------------------------"
"----------------------------------------------------------------"
"----------------------------------------------------------------";
struct METADATA *metadata = NULL;
struct DATA *data = NULL;
SQLSMALLINT ncols = 0;
RETCODE erc;
int c, ret;
/*
* Process each resultset
*/
do {
/* free metadata, in case it was previously allocated */
free_metadata(metadata, data, ncols);
metadata = NULL;
data = NULL;
ncols = 0;
/*
* Allocate memory for metadata and bound columns
*/
if ((erc = SQLNumResultCols(hStmt, &ncols)) != SQL_SUCCESS){
odbc_perror(hStmt, erc, "SQLNumResultCols", "failed");
exit(EXIT_FAILURE);
}
metadata = (struct METADATA*) calloc(ncols, sizeof(struct METADATA));
assert(metadata);
data = (struct DATA*) calloc(ncols, sizeof(struct DATA));
assert(data);
/*
* For each column, get its name, type, and size.
* Allocate a buffer to hold the data, and bind the buffer to the column.
* "bind" here means to give the address of the buffer we want filled as each row is fetched.
*/
fprintf(options.verbose, "Metadata\n");
fprintf(options.verbose, "%-6s %-30s %-10s %-18s %-6s %-6s \n",
"col", "name", "type value", "type name", "size", "varies");
fprintf(options.verbose, "%.6s %.30s %.10s %.18s %.6s %.6s \n",
dashes, dashes, dashes, dashes, dashes, dashes);
for (c=0; c < ncols; c++) {
/* Get and print the metadata. Optional: get only what you need. */
SQLCHAR name[512];
SQLSMALLINT namelen, ndigits, fnullable;
if ((erc = SQLDescribeCol(hStmt, c+1, name, sizeof(name), &namelen,
&metadata[c].type, &metadata[c].size,
&ndigits, &fnullable)) != SQL_SUCCESS) {
odbc_perror(hStmt, erc, "SQLDescribeCol", "failed");
exit(EXIT_FAILURE);
}
assert(namelen < sizeof(name));
name[namelen] = '\0';
metadata[c].name = strdup((char *) name);
metadata[c].width = (ndigits > metadata[c].size)? ndigits : metadata[c].size;
if (is_character_data(metadata[c].type)) {
SQLHDESC hDesc;
SQLINTEGER buflen;
metadata[c].nchars = metadata[c].size;
if ((erc = SQLAllocHandle(SQL_HANDLE_DESC, hStmt, &hDesc)) != SQL_SUCCESS) {
odbc_perror(hStmt, erc, "SQLAllocHandle", "failed");
exit(EXIT_FAILURE);
}
if ((erc = SQLGetDescField(hDesc, c+1, SQL_DESC_OCTET_LENGTH,
&metadata[c].size, sizeof(metadata[c].size),
&buflen)) != SQL_SUCCESS) {
odbc_perror(hStmt, erc, "SQLGetDescField", "failed");
exit(EXIT_FAILURE);
}
if ((erc = SQLFreeHandle(SQL_HANDLE_DESC, hStmt)) != SQL_SUCCESS) {
odbc_perror(hStmt, erc, "SQLFreeHandle", "failed");
exit(EXIT_FAILURE);
}
}
fprintf(options.verbose, "%6d %30s %10d %18s %6lu %6d \n",
c+1, metadata[c].name, (int)metadata[c].type, prtype(metadata[c].type),
(long unsigned int) metadata[c].size, -1);
#if 0
fprintf(options.verbose, "%6d %30s %30s %15s %6d %6d \n",
c+1, metadata[c].name, metadata[c].source, dbprtype(metadata[c].type),
metadata[c].size, dbvarylen(dbproc, c+1));
metadata[c].width = get_printable_size(metadata[c].type, metadata[c].size);
if (metadata[c].width < strlen(metadata[c].name))
metadata[c].width = strlen(metadata[c].name);
#endif
/*
* Build the column header format string, based on the column width.
* This is just one solution to the question, "How wide should my columns be when I print them out?"
*/
ret = set_format_string(&metadata[c], (c+1 < ncols)? options.colsep : "\n");
if (ret <= 0) {
fprintf(stderr, "%s:%d: asprintf(), column %d failed\n", options.appname, __LINE__, c+1);
return;
}
/*
* Bind the column to our variable.
* We bind everything to strings, because we want to convert everything to strings for us.
* If you're performing calculations on the data in your application, you'd bind the numeric data
* to C integers and floats, etc. instead.
*
* It is not necessary to bind to every column returned by the query.
* Data in unbound columns are simply never copied to the user's buffers and are thus
* inaccesible to the application.
*/
data[c].buffer = calloc(1, bufsize(&metadata[c]));
assert(data[c].buffer);
if ((erc = SQLBindCol(hStmt, c+1, SQL_C_CHAR, (SQLPOINTER)data[c].buffer,
bufsize(&metadata[c]), &data[c].len)) != SQL_SUCCESS){
odbc_perror(hStmt, erc, "SQLBindCol", "failed");
exit(EXIT_FAILURE);
}
}
if (!options.fquiet) {
/* Print the column headers to stderr to keep them separate from the data. */
for (c=0; c < ncols; c++) {
fprintf(options.headers, metadata[c].format_string, metadata[c].name);
}
/* Underline the column headers. */
for (c=0; c < ncols; c++) {
fprintf(options.headers, metadata[c].format_string, dashes);
}
}
/*
* Print the data to stdout.
*/
while (ncols > 0 && (erc = SQLFetch(hStmt)) != SQL_NO_DATA) {
switch(erc) {
case SQL_SUCCESS_WITH_INFO:
print_error_message(SQL_HANDLE_STMT, hStmt);
case SQL_SUCCESS:
break;
default:
odbc_perror(hStmt, erc, "SQLFetch", "failed");
exit(EXIT_FAILURE);
}
for (c=0; c < ncols; c++) {
char *s;
switch (data[c].len) { /* handle nulls */
case SQL_NULL_DATA: /* is null */
fprintf(stdout, metadata[c].format_string, "NULL");
break;
default:
assert(data[c].len > 0);
s = calloc(1, 1 + data[c].len);
assert(s);
memcpy(s, data[c].buffer, data[c].len);
fprintf(stdout, metadata[c].format_string, s);
free(s);
break;
}
}
}
if (ncols > 0 && erc == SQL_NO_DATA)
print_error_message(SQL_HANDLE_STMT, hStmt);
erc = SQLMoreResults(hStmt);
fprintf(options.verbose, "SQLMoreResults returned %s\n", prret(erc));
switch (erc) {
case SQL_NO_DATA:
print_error_message(SQL_HANDLE_STMT, hStmt);
break;
case SQL_SUCCESS_WITH_INFO:
print_error_message(SQL_HANDLE_STMT, hStmt);
case SQL_SUCCESS:
continue;
default:
odbc_perror(hStmt, erc, "SQLMoreResults", "failed");
exit(EXIT_FAILURE);
}
} while (erc != SQL_NO_DATA);
if (erc != SQL_NO_DATA) {
assert(erc != SQL_STILL_EXECUTING);
odbc_perror(hStmt, erc, "SQLMoreResults", "failed");
exit(EXIT_FAILURE);
}
}