/*************************************************************************** * Licensed Materials - Property of IBM and/or HCL * * IBM Informix Client-SDK * * Copyright IBM Corporation 1997, 2013 All rights reserved. * (c) Copyright HCL Technologies Ltd. 2017. All Rights Reserved. * * Title: loselect.c * Description: To retrieve a smart large object stored in the database * the column retrieved is the 'advert' column of the * table 'item' (datatype - CLOB) * *************************************************************************** */ #include #include #include #ifndef NO_WIN32 #include #include #include #endif /*NO_WIN32*/ #include "infxcli.h" #define BUFFER_LEN 25 #define ERRMSG_LEN 200 SQLCHAR defDsn[] = "odbc_demo"; SQLINTEGER checkError (SQLRETURN rc, SQLSMALLINT handleType, SQLHANDLE handle, SQLCHAR* 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 */ SQLLEN lofd = 0; SQLLEN lofd_valsize = 0; /* Smart large object pointer structure */ SQLCHAR* loptr_buffer; SQLSMALLINT loptr_size = 0; SQLLEN loptr_valsize = 0; /* Smart large object status structure */ SQLCHAR* lostat_buffer; SQLSMALLINT lostat_size = 0; SQLLEN lostat_valsize = 0; /* Smart large object data */ SQLCHAR* lo_data; SQLLEN lo_data_valsize = 0; /* Miscellaneous variables */ SQLCHAR dsn[20]; /*name of the DSN used for connecting to the database*/ SQLRETURN rc = 0; SQLINTEGER in; SQLCHAR verInfoBuffer[BUFFER_LEN]; SQLSMALLINT verInfoLen; SQLCHAR* selectStmt = (SQLCHAR *) "SELECT advert FROM item WHERE item_num = 1004"; SQLINTEGER mode = LO_RDONLY; SQLLEN lo_size = 0; SQLLEN cbMode = 0, cbLoSize = 0; /* STEP 1. Get data source name from command line (or use default) ** Allocate the environment handle and set ODBC version ** Allocate the connection handle ** Establish the database connection ** Get version information from the database server ** -- if version < 9.x (not UDO enabled), exit with error message ** 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!!\n"); return (1); } /* Set the ODBC version to 3.0 */ rc = SQLSetEnvAttr (henv, SQL_ATTR_ODBC_VERSION, (SQLPOINTER) SQL_OV_ODBC3, 0); if (checkError (rc, SQL_HANDLE_ENV, henv, (SQLCHAR *) "Error in Step 1 -- SQLSetEnvAttr failed\nExiting!!\n")) return (1); /* Allocate the connection handle */ rc = SQLAllocHandle (SQL_HANDLE_DBC, henv, &hdbc); if (checkError (rc, SQL_HANDLE_ENV, henv, (SQLCHAR *) "Error in Step 1 -- Connection Handle Allocation failed\nExiting!!\n")) return (1); /* Establish the database connection */ rc = SQLConnect (hdbc, dsn, SQL_NTS, (SQLCHAR *) "", SQL_NTS, (SQLCHAR *) "", SQL_NTS); if (checkError (rc, SQL_HANDLE_DBC, hdbc, (SQLCHAR *) "Error in Step 1 -- SQLConnect failed\nExiting!!\n")) return (1); /* Get version information from the database server If version < 9.x (not UDO enabled), exit with error message */ rc = SQLGetInfo (hdbc, SQL_DBMS_VER, verInfoBuffer, BUFFER_LEN, &verInfoLen); if (checkError (rc, SQL_HANDLE_DBC, hdbc, (SQLCHAR *) "Error in Step 1 -- SQLGetInfo failed\n")) return 1; if ((strncmp ((char *) verInfoBuffer, "09", 2)) < 0) { fprintf (stdout, "\n** This test can only be run against UDO-enabled database server -- version 9 or higher **\n"); return 1; } /* Allocate the statement handle */ rc = SQLAllocHandle (SQL_HANDLE_STMT, hdbc, &hstmt ); if (checkError (rc, SQL_HANDLE_DBC, hdbc, (SQLCHAR *) "Error in Step 1 -- Statement Handle Allocation failed\nExiting!!\n")) return (1); fprintf (stdout, "STEP 1 done...connected to database\n"); /* STEP 2. Select a smart-large object from the database ** -- the select statement executed is - ** "SELECT advert FROM item WHERE item_num = 1004" */ /* Execute the select statement */ rc = SQLExecDirect (hstmt, selectStmt, SQL_NTS); if (checkError (rc, SQL_HANDLE_STMT, hstmt, (SQLCHAR *) "Error in Step 2 -- SQLExecDirect failed\n")) goto Exit; fprintf (stdout, "STEP 2 done...select statement executed...smart large object retrieved from the databse\n"); /* STEP 3. Get the size of the smart large object pointer structure ** Allocate a buffer to hold the structure. ** Get the smart large object pointer structure from the database ** Close the result set cursor */ /* 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, (SQLCHAR *) "Error in Step 3 -- SQLGetInfo failed\n")) goto Exit; /* Allocate a buffer to hold the smart large object pointer structure */ loptr_buffer = malloc (loptr_size); /* Bind the smart large object pointer structure buffer allocated to * the column in the result set & fetch it from the database */ rc = SQLBindCol (hstmt, 1, SQL_C_BINARY, loptr_buffer, loptr_size, &loptr_valsize); if (checkError (rc, SQL_HANDLE_STMT, hstmt, (SQLCHAR *) "Error in Step 3 -- SQLBindCol failed\n")) goto Exit; rc = SQLFetch (hstmt); if (rc == SQL_NO_DATA_FOUND) { fprintf (stdout, "No Data Found\nExiting!!\n"); goto Exit; } if (checkError (rc, SQL_HANDLE_STMT, hstmt, (SQLCHAR *) "Error in Step 3 -- SQLFetch failed\n")) goto Exit; /* Close the result set cursor */ rc = SQLCloseCursor (hstmt); if (checkError (rc, SQL_HANDLE_STMT, hstmt, (SQLCHAR *) "Error in Step 3 -- SQLCloseCursor failed\n")) goto Exit; fprintf (stdout, "STEP 3 done...smart large object pointer structure fetched from the database\n"); /* STEP 4. Use the smart large object's pointer structure to open it ** and obtain the smart large object file descriptor. ** Reset the statement parameters */ rc = SQLBindParameter (hstmt, 1, SQL_PARAM_OUTPUT, SQL_C_LONG, SQL_INTEGER, (UDWORD)0, 0, &lofd, sizeof(lofd), &lofd_valsize); if (checkError (rc, SQL_HANDLE_STMT, hstmt, (SQLCHAR *) "Error in Step 4 -- SQLBindParameter failed (param 1)\n")) goto Exit; rc = SQLBindParameter (hstmt, 2, 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, (SQLCHAR *) "Error in Step 4 -- SQLBindParameter failed (param 2)\n")) goto Exit; rc = SQLBindParameter (hstmt, 3, SQL_PARAM_INPUT, SQL_C_LONG, SQL_INTEGER, (UDWORD)0, 0, &mode, sizeof(mode), &cbMode); if (checkError (rc, SQL_HANDLE_STMT, hstmt, (SQLCHAR *) "Error in Step 4 -- SQLBindParameter failed (param 3)\n")) goto Exit; rc = SQLExecDirect (hstmt, (SQLCHAR *) "{? = call ifx_lo_open(?, ?)}", SQL_NTS); if (checkError (rc, SQL_HANDLE_STMT, hstmt, (SQLCHAR *) "Error in Step 4 -- SQLExecDirect failed\n")) goto Exit; /* Reset the statement parameters */ rc = SQLFreeStmt (hstmt, SQL_RESET_PARAMS); if (checkError (rc, SQL_HANDLE_STMT, hstmt, (SQLCHAR *) "Error in Step 4 -- SQLFreeStmt failed\n")) goto Exit; fprintf (stdout, "STEP 4 done...smart large object opened... file descriptor obtained\n"); /* STEP 5. Get the size of the smart large object status structure ** Allocate a buffer to hold the structure. ** Get the smart large object status structure from the database ** Reset the statement parameters */ /* Get the size of the smart large object status structure */ rc = SQLGetInfo (hdbc, SQL_INFX_LO_STAT_LENGTH, &lostat_size, sizeof(lostat_size), NULL); if (checkError (rc, SQL_HANDLE_DBC, hdbc, (SQLCHAR *) "Error in Step 5 -- SQLGetInfo failed\n")) goto Exit; /* Allocate a buffer to hold the smart large object status structure. */ lostat_buffer = malloc(lostat_size); /* Get the smart large object status structure from the database. */ 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, (SQLCHAR *) "Error in Step 5 -- SQLBindParameter failed (param 1)\n")) goto Exit; rc = SQLBindParameter (hstmt, 2, SQL_PARAM_INPUT_OUTPUT, SQL_C_BINARY, SQL_INFX_UDT_FIXED, (UDWORD)lostat_size, 0, lostat_buffer, lostat_size, &lostat_valsize); if (checkError (rc, SQL_HANDLE_STMT, hstmt, (SQLCHAR *) "Error in Step 5 -- SQLBindParameter failed (param 2)\n")) goto Exit; rc = SQLExecDirect (hstmt, (SQLCHAR *) "{call ifx_lo_stat(?, ?)}", SQL_NTS); if (checkError (rc, SQL_HANDLE_STMT, hstmt, (SQLCHAR *) "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, (SQLCHAR *) "Error in Step 5 -- SQLFreeStmt failed\n")) goto Exit; fprintf (stdout, "STEP 5 done...smart large object status structure fetched from the database\n"); /* STEP 6. Use the smart large object's status structure to get the size ** of the smart large object ** Reset the statement parameters */ /* Use the smart large object status structure to get the size of the smart large object. */ rc = SQLBindParameter (hstmt, 1, SQL_PARAM_INPUT, SQL_C_BINARY, SQL_INFX_UDT_FIXED, (UDWORD)lostat_size, 0, lostat_buffer, lostat_size, &lostat_valsize); if (checkError (rc, SQL_HANDLE_STMT, hstmt, (SQLCHAR *) "Error in Step 6 -- SQLBindParameter failed (param 1)\n")) goto Exit; rc = SQLBindParameter (hstmt, 2, SQL_PARAM_OUTPUT, SQL_C_LONG, SQL_BIGINT, (UDWORD)0, 0, &lo_size, sizeof(lo_size), &cbLoSize); if (checkError (rc, SQL_HANDLE_STMT, hstmt, (SQLCHAR *) "Error in Step 6 -- SQLBindParameter failed (param 1)\n")) goto Exit; rc = SQLExecDirect (hstmt, (SQLCHAR *) "{call ifx_lo_stat_size(?, ?)}", SQL_NTS); if (checkError (rc, SQL_HANDLE_STMT, hstmt, (SQLCHAR *) "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, (SQLCHAR *) "Error in Step 6 -- SQLFreeStmt failed\n")) goto Exit; fprintf (stdout, "STEP 6 done...smart large object size = %ld bytes\n", lo_size); /* STEP 7. Allocate a buffer to hold the smart large object's data ** Read the smart large object's data using its file descriptor ** Null-terminate the last byte of the smart large-object's data ** Print out the contents of the smart large object ** Reset the statement parameters */ /* Allocate a buffer to hold the smart large object's data chunks */ lo_data = malloc (lo_size + 1); /* Read the smart large object's data */ 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, (SQLCHAR *) "Error in Step 7 -- SQLBindParameter failed (param 1)\n")) goto Exit; rc = SQLBindParameter (hstmt, 2, SQL_PARAM_OUTPUT, SQL_C_CHAR, SQL_CHAR, lo_size, 0, lo_data, lo_size, &lo_data_valsize); if (checkError (rc, SQL_HANDLE_STMT, hstmt, (SQLCHAR *) "Error in Step 7 -- SQLBindParameter failed (param 2)\n")) goto Exit; rc = SQLExecDirect (hstmt, (SQLCHAR *) "{call ifx_lo_read(?, ?)}", SQL_NTS); if (checkError (rc, SQL_HANDLE_STMT, hstmt, (SQLCHAR *) "Error in Step 7 -- SQLExecDirect failed\n")) goto Exit; /* Null-terminate the last byte of the smart large objects data */ lo_data[lo_size] = '\0'; /* Print the contents of the smart large object */ fprintf (stdout, "Smart large object contents are.....\n\n\n%s\n\n\n", lo_data); /* Reset the statement parameters */ rc = SQLFreeStmt (hstmt, SQL_RESET_PARAMS); if (checkError (rc, SQL_HANDLE_STMT, hstmt, (SQLCHAR *) "Error in Step 7 -- SQLFreeStmt failed\n")) goto Exit; fprintf (stdout, "STEP 7 done...smart large object read completely\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, (SQLCHAR *) "Error in Step 8 -- SQLBindParameter failed\n")) goto Exit; rc = SQLExecDirect (hstmt, (SQLCHAR *) "{call ifx_lo_close(?)}", SQL_NTS); if (checkError (rc, SQL_HANDLE_STMT, hstmt, (SQLCHAR *) "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 (loptr_buffer); free (lostat_buffer); free (lo_data); 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 to terminate the program...\n\n"); in = getchar (); return (rc); }