Example of creating a smart large object

The code example, locreate.c, shows how to create a smart large object.

You can find the locreate.c file in the %INFORMIXDIR%/demo/clidemo directory on UNIX™ platforms and in the %INFORMIXDIR%\demo\odbcdemo directory in Windows™ environments. You can also find instructions on how to build the odbc_demo database in the same location.
/*
**      locreate.c
**
**  To create a smart large object
**
**    OBDC Functions:
**      SQLAllocHandle
**      SQLBindParameter
**      SQLConnect
**      SQLFreeStmt
**      SQLGetInfo
**      SQLDisconnect
**      SQLExecDirect
*/

#include <stdio.h>
#include <stdlib.h>
#include <string.h>

#ifndef NO_WIN32
#include <io.h>
#include <windows.h>
#include <conio.h>
#endif /*NO_WIN32*/

#include "infxcli.h"

#define BUFFER_LEN      12
#define ERRMSG_LEN      200

UCHAR   defDsn[] = "odbc_demo";


int checkError (SQLRETURN         rc,
                SQLSMALLINT     handleType,
                SQLHANDLE       handle,
                char            *errmsg)
{
   SQLRETURN         retcode = SQL_SUCCESS;

   SQLSMALLINT     errNum = 1;
   SQLCHAR         sqlState[6];
   SQLINTEGER      nativeError;
   SQLCHAR         errMsg[ERRMSG_LEN];
   SQLSMALLINT     textLengthPtr;

   if ((rc != SQL_SUCCESS) && (rc != SQL_SUCCESS_WITH_INFO))
   {
      while (retcode != SQL_NO_DATA)
      {
         retcode = SQLGetDiagRec (handleType, handle, errNum, sqlState,
            &nativeError, errMsg, ERRMSG_LEN, &textLengthPtr);

         if (retcode == SQL_INVALID_HANDLE)
         {
            fprintf (stderr, "checkError function was called with an
               invalid handle!!\n");
            return 1;
         }

         if ((retcode == SQL_SUCCESS)     || (retcode == SQL_SUCCESS_WITH_INFO))
            fprintf (stderr, "ERROR: %d:  %s : %s \n", nativeError,
               sqlState, errMsg);

         errNum++;
      }

      fprintf (stderr, "%s\n", errmsg);
      return 1;   /* all errors on this handle have been reported */
   }
   else
      return 0;   /* no errors to report */
}

int main (long         argc,
          char        *argv[])
{
   /* Declare variables
   */

   /* Handles */
   SQLHDBC     hdbc;
   SQLHENV     henv;
   SQLHSTMT    hstmt;

   /* Smart large object file descriptor */
   long        lofd;
   long        lofd_valsize = 0;
 
   /* Smart large object pointer structure */
   char*       loptr_buffer;
   short       loptr_size;
   long        loptr_valsize = 0;

   /* Smart large object specification structure */
   char*       lospec_buffer;
   short       lospec_size;
   long        lospec_valsize = 0;

   /* Write buffer */
   char*             write_buffer;
   short            write_size;
   long            write_valsize = 0;

   /* Miscellaneous variables */
   UCHAR    dsn[20];/*name of the DSN used for connecting to the
                           database*/
   SQLRETURN   rc = 0;
   int         in;

   FILE*       hfile;
   char*       lo_file_name = "advert.txt";

   char        colname[BUFFER_LEN] = "item.advert";
   long        colname_size = SQL_NTS;

   long        mode = LO_RDWR;
   long        cbMode = 0;

   char*       insertStmt = "INSERT INTO item VALUES (1005, 'Helmet', 235,
                  'Each', ?, '39.95')";


/*   STEP 1.  Get data source name from command line (or use default).
   **       Allocate environment handle and set ODBC version.
   **       Allocate connection handle.
   **       Establish the database connection.
   **       Allocate the statement handle.
   */

   /* If (dsn is not explicitly passed in as arg) */
   if (argc != 2)
   {
      /* Use default dsn - odbc_demo */
      fprintf (stdout, "\nUsing default DSN : %s\n", defDsn);
      strcpy ((char *)dsn, (char *)defDsn);
   }
   else
   {
      /* Use specified dsn */
      strcpy ((char *)dsn, (char *)argv[1]);
      fprintf (stdout, "\nUsing specified DSN : %s\n", dsn);
   }

   /* Allocate the Environment handle */
   rc = SQLAllocHandle (SQL_HANDLE_ENV, SQL_NULL_HANDLE, &henv);
   if (rc != SQL_SUCCESS)
   {
      fprintf (stdout, "Environment Handle Allocation failed\nExiting!!");
      return (1);
   }

   /* Set the ODBC version to 3.5 */
   rc = SQLSetEnvAttr (henv, SQL_ATTR_ODBC_VERSION,
         (SQLPOINTER)SQL_OV_ODBC3, 0);
   if (checkError (rc, SQL_HANDLE_ENV, henv, "Error in Step 1 --
         SQLSetEnvAttr failed\nExiting!!"))
      return (1);

   /* Allocate the connection handle */
   rc = SQLAllocHandle (SQL_HANDLE_DBC, henv, &hdbc);
   if (checkError (rc, SQL_HANDLE_ENV, henv, "Error in Step 1 -- Connection
         Handle Allocation failed\nExiting!!"))
      return (1);

   /* Establish the database connection */
   rc = SQLConnect (hdbc, dsn, SQL_NTS, "", SQL_NTS, "", SQL_NTS);
   if (checkError (rc, SQL_HANDLE_DBC, hdbc, "Error in Step 1 -- SQLConnect
         failed\n"))
      return (1);

   /* Allocate the statement handle */
   rc = SQLAllocHandle (SQL_HANDLE_STMT, hdbc, &hstmt);
   if (checkError (rc, SQL_HANDLE_DBC, hdbc, "Error in Step 1 -- Statement
         Handle Allocation failed\nExiting!!"))
      return (1);

   fprintf (stdout, "STEP 1 done...connected to database\n");


/* STEP 2.  Get the size of the smart large object specification
   **       structure.
   **       Allocate a buffer to hold the structure.
   **       Create a default smart large object specification structure.
   **       Reset the statement parameters.
   */

   /* Get the size of a smart large object specification structure */
   rc = SQLGetInfo (hdbc, SQL_INFX_LO_SPEC_LENGTH, &lospec_size,
         sizeof(lospec_size), NULL);
   if (checkError (rc, SQL_HANDLE_DBC, hdbc, "Error in Step 2 -- SQLGetInfo
         failed\n"))
      goto Exit;

   /* Allocate a buffer to hold the smart large object specification
         structure*/
   lospec_buffer = malloc (lospec_size);

   /* Create a default smart large object specification structure */
   rc = SQLBindParameter (hstmt, 1, SQL_PARAM_INPUT_OUTPUT, SQL_C_BINARY,
         SQL_INFX_UDT_FIXED, (UDWORD)lospec_size, 0, lospec_buffer,
         lospec_size, &lospec_valsize);
   if (checkError (rc, SQL_HANDLE_STMT, hstmt, "Error in Step 2 --
         SQLBindParameter failed\n"))
      goto Exit;
   rc = SQLExecDirect (hstmt, "{call ifx_lo_def_create_spec(?)}", SQL_NTS);
   if (checkError (rc, SQL_HANDLE_STMT, hstmt, "Error in Step 2 --
         SQLExecDirect failed\n"))
      goto Exit;

   /* Reset the statement parameters */
   rc = SQLFreeStmt (hstmt, SQL_RESET_PARAMS);
   if (checkError (rc, SQL_HANDLE_STMT, hstmt, "Error in Step 2 --
         SQLFreeStmt failed\n"))
      goto Exit;

   fprintf (stdout, "STEP 2 done...default smart large object specification
         structure created\n");


/* STEP 3.  Initialise the smart large object specification structure
   **       with values for the database column where the smart large
   **       object is being inserted.
   **       Reset the statement parameters.
   */

   /* Initialise the smart large object specification structure */
   rc = SQLBindParameter (hstmt, 1, SQL_PARAM_INPUT, SQL_C_CHAR, SQL_CHAR,
         BUFFER_LEN, 0, colname, BUFFER_LEN, &colname_size);
   if (checkError (rc, SQL_HANDLE_STMT, hstmt, "Error in Step 3 --
         SQLBindParameter failed (param 1)\n"))
      goto Exit;

   lospec_valsize = lospec_size;

   rc = SQLBindParameter (hstmt, 2, SQL_PARAM_INPUT_OUTPUT, SQL_C_BINARY,
         SQL_INFX_UDT_FIXED, (UDWORD)lospec_size, 0, lospec_buffer,
         lospec_size, &lospec_valsize);
   if (checkError (rc, SQL_HANDLE_STMT, hstmt, "Error in Step 3 --
         SQLBindParameter failed (param 2)\n"))
      goto Exit;

   rc = SQLExecDirect (hstmt, "{call ifx_lo_col_info(?, ?)}", SQL_NTS);
   if (checkError (rc, SQL_HANDLE_STMT, hstmt, "Error in Step 3 --
         SQLExecDirect failed\n"))
      goto Exit;
   
   /* Reset the statement parameters */
   rc = SQLFreeStmt (hstmt, SQL_RESET_PARAMS);
   if (checkError (rc, SQL_HANDLE_STMT, hstmt, "Error in Step 3 --
         SQLFreeStm failed\n"))
      goto Exit;

   fprintf(stdout, "STEP 3 done...smart large object specification
         structure initialised\n");


/* STEP 4.  Get the size of the smart large object pointer structure.
   **       Allocate a buffer to hold the structure.
   */

   /* Get the size of the smart large object pointer structure */
   rc = SQLGetInfo (hdbc, SQL_INFX_LO_PTR_LENGTH, &loptr_size,
         sizeof(loptr_size), NULL);
   if (checkError (rc, SQL_HANDLE_DBC, hdbc, "Error in Step 4 --
         SQLGetInfo failed\n"))
      goto Exit;

   /* Allocate a buffer to hold the smart large object pointer structure */
   loptr_buffer = malloc (loptr_size);

   fprintf (stdout, "STEP 4 done...smart large object pointer structure
         allocated\n");


/* STEP 5.  Create a new smart large object.
   **       Reset the statement parameters.
   */

   /* Create a new smart large object */
   rc = SQLBindParameter (hstmt, 1, SQL_PARAM_INPUT, SQL_C_BINARY,
         SQL_INFX_UDT_FIXED, (UDWORD)lospec_size, 0, lospec_buffer,
         lospec_size, &lospec_valsize);
   if (checkError (rc, SQL_HANDLE_STMT, hstmt, "Error in Step 5 --
         SQLBindParameter failed (param 1)\n"))
      goto Exit;

   rc = SQLBindParameter (hstmt, 2, SQL_PARAM_INPUT, SQL_C_SLONG,
         SQL_INTEGER, (UDWORD)0, 0, &mode, sizeof(mode), &cbMode);
   if (checkError (rc, SQL_HANDLE_STMT, hstmt, "Error in Step 5 --
         SQLBindParameter failed (param 2)\n"))
      goto Exit;

   loptr_valsize = loptr_size;

   rc = SQLBindParameter (hstmt, 3, SQL_PARAM_INPUT_OUTPUT, SQL_C_BINARY,
         SQL_INFX_UDT_FIXED, (UDWORD)loptr_size, 0, loptr_buffer,
         loptr_size, &loptr_valsize);
   if (checkError (rc, SQL_HANDLE_STMT, hstmt, "Error in Step 5 --
         SQLBindParameter failed (param 3)\n"))
      goto Exit;

   rc = SQLBindParameter (hstmt, 4, SQL_PARAM_OUTPUT, SQL_C_SLONG,
         SQL_INTEGER, (UDWORD)0, 0, &lofd, sizeof(lofd), &lofd_valsize);
   if (checkError (rc, SQL_HANDLE_STMT, hstmt, "Error in Step 5 --
         SQLBindParameter failed (param 4)\n"))
      goto Exit;

   rc = SQLExecDirect (hstmt, "{call ifx_lo_create(?, ?, ?, ?)}", SQL_NTS);
   if (checkError (rc, SQL_HANDLE_STMT, hstmt, "Error in Step 5 --
         SQLExecDirect failed\n"))
      goto Exit;

   /* Reset the statement parameters */
   rc = SQLFreeStmt (hstmt, SQL_RESET_PARAMS);
   if (checkError (rc, SQL_HANDLE_STMT, hstmt, "Error in Step 5 --
         SQLFreeStmt failed\n"))
      goto Exit;

   fprintf (stdout, "STEP 5 done...smart large object created\n");


/* STEP 6.  Open the file containing data for the new smart large object.
   **       Allocate a buffer to hold the smart large object data.
   **       Read data from the input file into the smart large object.
   **       data buffer
   **       Write data from the data buffer into the new smart large.
   **       object.
   **       Reset the statement parameters.
   */

   /* Open the file containing data for the new smart large object */
   hfile = open (lo_file_name, "rt");
   /* sneaky way to get the size of the file */
   write_size = lseek (open (lo_file_name, "rt"), 0L, SEEK_END); 

   /* Allocate a buffer to hold the smart large object data */
   write_buffer = malloc (write_size + 1);

   /* Read smart large object data from file */
   read (hfile, write_buffer, write_size);

   write_buffer[write_size] = '\0';
   write_valsize = write_size;
   /* Write data from the data buffer into the new smart large object */
   rc = SQLBindParameter (hstmt, 1, SQL_PARAM_INPUT, SQL_C_SLONG,
         SQL_INTEGER, (UDWORD)0, 0, &lofd, sizeof(lofd), &lofd_valsize);
   if (checkError (rc, SQL_HANDLE_STMT, hstmt, "Error in Step 6 --
         SQLBindParameter failed (param 1)\n"))
      goto Exit;

   rc = SQLBindParameter (hstmt, 2, SQL_PARAM_INPUT, SQL_C_CHAR, SQL_CHAR,
         (UDWORD)write_size, 0, write_buffer, write_size, &write_valsize);
   if (checkError (rc, SQL_HANDLE_STMT, hstmt, "Error in Step 6 --
         SQLBindParameter failed (param 2)\n"))
      goto Exit;

   rc = SQLExecDirect (hstmt, "{call ifx_lo_write(?, ?)}", SQL_NTS);
   if (checkError (rc, SQL_HANDLE_STMT, hstmt, "Error in Step 6 --
         SQLExecDirect failed\n"))
      goto Exit;

   /* Reset the statement parameters */
   rc = SQLFreeStmt (hstmt, SQL_RESET_PARAMS);
   if (checkError (rc, SQL_HANDLE_STMT, hstmt, "Error in Step 6 --
         SQLFreeStmt failed\n"))
      goto Exit;

   fprintf (stdout, "STEP 6 done...data written to new smart large
         object\n");


/* STEP 7.  Insert the new smart large object into the database.
   **       Reset the statement parameters.
   */

   /* Insert the new smart large object into the database */
   loptr_valsize = loptr_size;

   rc = SQLBindParameter (hstmt, 1, SQL_PARAM_INPUT, SQL_C_BINARY,
         SQL_INFX_UDT_FIXED, (UDWORD)loptr_size, 0, loptr_buffer,
         loptr_size, &loptr_valsize);
   if (checkError (rc, SQL_HANDLE_STMT, hstmt, "Error in Step 7 --
         SQLBindParameter failed\n"))
      goto Exit;

   rc = SQLExecDirect (hstmt, insertStmt, SQL_NTS);
   if (checkError (rc, SQL_HANDLE_STMT, hstmt, "Error in Step 7 --
         SQLExecDirect failed\n"))
      goto Exit;

   /* Reset the statement parameters */
   rc = SQLFreeStmt (hstmt, SQL_RESET_PARAMS);
   if (checkError (rc, SQL_HANDLE_STMT, hstmt, "Error in Step 7 --
         SQLFreeStmt failed\n"))
      goto Exit;

   fprintf (stdout, "STEP 7 done...smart large object inserted into the
         database\n");


/* STEP 8.  Close the smart large object.
   */

   rc = SQLBindParameter (hstmt, 1, SQL_PARAM_INPUT, SQL_C_LONG,
         SQL_INTEGER, (UDWORD)0, 0, &lofd, sizeof(lofd), &lofd_valsize);
   if (checkError (rc, SQL_HANDLE_STMT, hstmt, "Error in Step 8 --
         SQLBindParameter failed\n"))
      goto Exit;

   rc = SQLExecDirect (hstmt, "{call ifx_lo_close(?)}", SQL_NTS);
   if (checkError (rc, SQL_HANDLE_STMT, hstmt, "Error in Step 8 --
         SQLExecDirect failed\n"))
      goto Exit;

   fprintf (stdout, "STEP 8 done...smart large object closed\n");


/* STEP 9.  Free the allocated buffers.
   */

   free (lospec_buffer);
   free (loptr_buffer);
   free (write_buffer);

   fprintf (stdout, "STEP 9 done...smart large object buffers freed\n");

   Exit:

   /* CLEANUP: Close the statement handle
   **          Free the statement handle
   **          Disconnect from the datasource
   **          Free the connection and environment handles
   **          Exit
   */

   /* Close the statement handle */
   SQLFreeStmt (hstmt, SQL_CLOSE);

   /* Free the statement handle */
   SQLFreeHandle (SQL_HANDLE_STMT, hstmt);

   /* Disconnect from the data source */
   SQLDisconnect (hdbc);

   /* Free the environment handle and the database connection handle */
   SQLFreeHandle (SQL_HANDLE_DBC, hdbc);
   SQLFreeHandle (SQL_HANDLE_ENV, henv);

   fprintf (stdout,"\n\nHit <Enter> to terminate the program...\n\n");
   in = getchar ();
   return (rc);
}