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[2005-08-02 18:34 UTC] sniper@php.net
[2005-08-02 18:50 UTC] paul dot robinson at groupbc dot com
[2005-08-02 19:12 UTC] sniper@php.net
[2005-08-05 16:57 UTC] paul dot robinson at groupbc dot com
[2005-08-06 01:30 UTC] sniper@php.net
[2005-08-06 07:48 UTC] fmk@php.net
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Last updated: Sun Apr 20 07:01:27 2025 UTC |
Description: ------------ MS SQL Server 2000, FreeTDS 0.63 Output parameters from a stored procedure call contain corrupt data when the result should be NULL. Its particularly noticable for variable length strings as output looks as though it just reads from a random pointer until it find a \0 ! No test is done on whether the output is NULL or not. Diff below shows proposed change to fix this. NOTE: This calls a function dbretisnull that is not currently implemented in the FreeTDS package but has been submitted as a proposed change. 19c19 < /* $Id: php_mssql.c,v 1.137.2.9 2005/04/12 17:46:06 fmk Exp $ */ --- > /* $Id: php_mssql.c,v 1.137.2.8 2005/02/25 23:25:33 fmk Exp $ */ 324,326d323 < #ifndef HAVE_FREETDS < dbwinexit(); < #else 328d324 < #endif 978c974 < int i, num_rets, type; --- > int i, num_rets, type, is_null; 992,1019c988,1022 < switch (type) { < case SQLBIT: < case SQLINT1: < case SQLINT2: < case SQLINT4: < convert_to_long_ex(&bind->zval); < /* FIXME this works only on little endian machine !!! */ < Z_LVAL_P(bind->zval) = *((int *)(dbretdata(mssql_ptr->link,i))); < break; < < case SQLFLT4: < case SQLFLT8: < case SQLFLTN: < case SQLMONEY4: < case SQLMONEY: < case SQLMONEYN: < convert_to_double_ex(&bind->zval); < Z_DVAL_P(bind->zval) = *((double *)(dbretdata(mssql_ptr->link,i))); < break; < < case SQLCHAR: < case SQLVARCHAR: < case SQLTEXT: < convert_to_string_ex(&bind->zval); < Z_STRLEN_P(bind->zval) = dbretlen(mssql_ptr->link,i); < Z_STRVAL_P(bind->zval) = estrndup(dbretdata(mssql_ptr->link,i),Z_STRLEN_P(bind->zval)); < break; < /* TODO binary */ --- > /* Test column value for null flag and set value as required */ > is_null = dbretisnull(mssql_ptr->link, i); > if (is_null) { > ZVAL_NULL(bind->zval); > } > else { > switch (type) { > case SQLBIT: > case SQLINT1: > case SQLINT2: > case SQLINT4: > convert_to_long_ex(&bind->zval); > /* FIXME this works only on little endian machine !!! */ > Z_LVAL_P(bind->zval) = *((int *)(dbretdata(mssql_ptr->link,i))); > break; > > case SQLFLT4: > case SQLFLT8: > case SQLFLTN: > case SQLMONEY4: > case SQLMONEY: > case SQLMONEYN: > convert_to_double_ex(&bind->zval); > Z_DVAL_P(bind->zval) = *((double *)(dbretdata(mssql_ptr->link,i))); > break; > > case SQLCHAR: > case SQLVARCHAR: > case SQLTEXT: > convert_to_string_ex(&bind->zval); > Z_STRLEN_P(bind->zval) = dbretlen(mssql_ptr->link,i); > Z_STRVAL_P(bind->zval) = estrndup(dbretdata(mssql_ptr->link,i),Z_STRLEN_P(bind->zval)); > break; > /* TODO binary */ > } Reproduce code: --------------- function if_null($out) { if(is_null($out)) { return 'null'; } else { return $out; } } $int0out =-1; $varchar0out = -1; $conn = mssql_connect (DBSERVER, USER, PASS); mssql_select_db(DBDATABASE, $conn) $query = mssql_init('usp_output_test', $conn); mssql_bind($query, "@int0out", $int0out, SQLINT4, true, false); mssql_bind($query, "@varchar0out", $varchar0out, SQLVARCHAR, true, false, 10); $myset = mssql_execute($query); if($line = mssql_fetch_array($myset)) { print "there was a result set!"; } else { print "no resultset"; } print if_null($int0out). " --int0out output</br>"; print if_null($varchar0out). " --varchar0out output</br>"; Expected result: ---------------- null --int0out output null --varchar0out output Actual result: -------------- null --int0out output 82$┤,╝d♥n╓ --varchar0out output