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- /*
- * Program type: API Interface
- *
- * Description:
- * This program selects a blob data type.
- * A set of project descriptions is printed.
- */
-
-
- #include <stdlib.h>
- #include <string.h>
- #include <ibase.h>
- #include <stdio.h>
- #include "example.h"
-
- #define TYPELEN 12
- #define PROJLEN 20
- #define BUFLEN 512
-
- /* This macro is used to declare structures representing SQL VARCHAR types */
- #define SQL_VARCHAR(len) struct {short vary_length; char vary_string[(len)+1];}
-
- int main (ARG(int, argc), ARG(char **, argv))
- ARGLIST(int argc)
- ARGLIST(char **argv)
- {
- SQL_VARCHAR(PROJLEN + 2) proj_name;
- char prod_type[TYPELEN + 2];
- char sel_str[BUFLEN + 1];
- ISC_QUAD blob_id;
- isc_blob_handle blob_handle = NULL;
- short blob_seg_len;
- char blob_segment[11];
- isc_db_handle DB = NULL; /* database handle */
- isc_tr_handle trans = NULL; /* transaction handle */
- long status[20]; /* status vector */
- isc_stmt_handle stmt = NULL; /* statement handle */
- XSQLDA ISC_FAR * sqlda;
- long fetch_stat, blob_stat;
- short flag0 = 0,
- flag1 = 0,
- flag2 = 0;
- char empdb[128];
-
- if (argc > 1)
- strcpy(empdb, argv[1]);
- else
- strcpy(empdb, "employee.gdb");
-
-
- strcpy(sel_str, "SELECT proj_name, proj_desc, product FROM project WHERE \
- product IN ('software', 'hardware', 'other') ORDER BY proj_name");
-
- if (isc_attach_database(status, 0, empdb, &DB, 0, NULL))
- {
- ERREXIT(status, 1)
- }
-
- if (isc_start_transaction(status, &trans, 1, &DB, 0, NULL))
- {
- ERREXIT(status, 1)
- }
-
- /*
- * Allocate and prepare the select statement.
- */
-
- if (isc_dsql_allocate_statement(status, &DB, &stmt))
- {
- ERREXIT(status, 1)
- }
-
- sqlda = (XSQLDA ISC_FAR *) malloc(XSQLDA_LENGTH(3));
- sqlda->sqln = 3;
- sqlda->version = 1;
-
- if (isc_dsql_prepare(status, &trans, &stmt, 0, sel_str, 1, sqlda))
- {
- ERREXIT(status, 1)
- }
-
- sqlda->sqlvar[0].sqldata = (char *)&proj_name;
- sqlda->sqlvar[0].sqltype = SQL_VARYING + 1;
- sqlda->sqlvar[0].sqlind = &flag0;
-
- sqlda->sqlvar[1].sqldata = (char ISC_FAR *) &blob_id;
- sqlda->sqlvar[1].sqltype = SQL_BLOB + 1;
- sqlda->sqlvar[1].sqlind = &flag1;
-
- sqlda->sqlvar[2].sqldata = prod_type;
- sqlda->sqlvar[2].sqltype = SQL_TEXT + 1;
- sqlda->sqlvar[2].sqlind = &flag2;
-
- if (isc_dsql_execute(status, &trans, &stmt, 1, NULL))
- {
- ERREXIT(status, 1)
- }
-
- /*
- * For each project in the select statement, get and display
- * project descriptions.
- */
-
- while ((fetch_stat = isc_dsql_fetch(status, &stmt, 1, sqlda)) == 0)
- {
- prod_type[TYPELEN] = '\0';
- printf("\nPROJECT: %-20.*s TYPE: %-15s\n\n",
- proj_name.vary_length, proj_name.vary_string, prod_type);
-
- /* Open the blob with the fetched blob_id. Notice that the
- * segment length is shorter than the average segment fetched.
- * Each partial fetch should return isc_segment.
- */
- if (isc_open_blob(status, &DB, &trans, &blob_handle, &blob_id))
- {
- ERREXIT(status, 1)
- }
-
- /* Get blob segments and their lengths and print each segment. */
- blob_stat = isc_get_segment(status, &blob_handle,
- (unsigned short ISC_FAR *) &blob_seg_len,
- sizeof(blob_segment), blob_segment);
- while (blob_stat == 0 || status[1] == isc_segment)
- {
- printf("%*.*s", blob_seg_len, blob_seg_len, blob_segment);
- blob_stat = isc_get_segment(status, &blob_handle,
- (unsigned short ISC_FAR *)&blob_seg_len,
- sizeof(blob_segment), blob_segment);
- }
- /* Close the blob. Should be blob_stat to check */
- if (status[1] == isc_segstr_eof)
- {
- if (isc_close_blob(status, &blob_handle))
- {
- ERREXIT(status, 1)
- }
- }
- else
- isc_print_status(status);
-
- printf("\n");
- }
-
- if (fetch_stat != 100L)
- {
- ERREXIT(status, 1)
- }
-
- if (isc_dsql_free_statement(status, &stmt, DSQL_close))
- {
- ERREXIT(status, 1)
- }
-
- if (isc_commit_transaction (status, &trans))
- {
- ERREXIT(status, 1)
- }
-
- if (isc_detach_database(status, &DB))
- {
- ERREXIT(status, 1)
- }
-
- free(sqlda);
-
- return 0;
- }
-