/*************************************************************************** * 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: distsel.c * * Description: To select data from a column that uses a DISTINCT * datatype * -- the column selected is 'unit_price' of the 'item' * table, which is of distinct type DOLLAR based on * decimal * * *************************************************************************** */ #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; /* 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 item_num, description, unit_price FROM item"; SQLCHAR description[BUFFER_LEN]; SQLLEN item_num, cbItemNum, cbDescription, cbUnitPrice; SQLREAL unit_price; /* 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. Retrieve data from the 'item' table and display the results ** Close the result set cursor */ /* Retrieve data from the 'item' table */ fprintf (stdout, "Retrieving data from 'item' table\n\n"); rc = SQLExecDirect (hstmt, selectStmt, SQL_NTS); if (checkError (rc, SQL_HANDLE_STMT, hstmt, (SQLCHAR *) "Error in Step 2 -- SQLExecDirect failed\n")) goto Exit; /* Bind the result set columns */ rc = SQLBindCol (hstmt, 1, SQL_C_LONG, &item_num, 0, &cbItemNum); if (checkError (rc, SQL_HANDLE_STMT, hstmt, (SQLCHAR *) "Error in Step 2 -- SQLBindCol failed (column 1)\n")) goto Exit; rc = SQLBindCol (hstmt, 2, SQL_C_CHAR, description, BUFFER_LEN, &cbDescription); if (checkError (rc, SQL_HANDLE_STMT, hstmt, (SQLCHAR *) "Error in Step 2 -- SQLBindCol failed (column 2)\n")) goto Exit; rc = SQLBindCol (hstmt, 3, SQL_C_FLOAT, &unit_price, 5, &cbUnitPrice); if (checkError (rc, SQL_HANDLE_STMT, hstmt, (SQLCHAR *) "Error in Step 2 -- SQLBindCol failed (column 3)\n")) goto Exit; while (1) { /* Fetch the data */ rc = SQLFetch (hstmt); if (rc == SQL_NO_DATA_FOUND) break; else if (checkError (rc, SQL_HANDLE_STMT, hstmt, (SQLCHAR *) "Error in Step 2 -- SQLFetch failed\n")) goto Exit; /* Display the results */ fprintf (stdout, "Item Num: %d, Unit_price (DISTINCT TYPE dollar): %5.2f, Description: %s\n", item_num, unit_price, description); } /* Close the result set cursor */ rc = SQLCloseCursor(hstmt); if (checkError (rc, SQL_HANDLE_STMT, hstmt, (SQLCHAR *) "Error in Step 2 -- SQLCloseCursor failed\n")) goto Exit; fprintf (stdout, "\nSTEP 2 done...data retrieved from 'item' table\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); }