php - wrong output in mysql_fetch_array -


here snippet of code :

    require_once('functions.php');     include('dbinfo.php');     connectdb();   $querys= "select 'score' solve (problem_id='".$_get['id']."' , username='".$_session['username']."')";             $resultscore=mysql_query($querys);             $scorefetch=mysql_fetch_array($resultscore);             $subractscore=$scorefetch['score']; echo $subractscore;

ideally output should value stored in score field of database..but prints '

score

' .. wrong in this?also the query results 1 record @ time.

the reason why query won't work expected because wrapping column name single quotes. (column name , table name) identifiers , not string literals shouldn't wrap single quote.

select score solve where....

if happens column names and/or tables names used reserved keywords, can escape backticks not single quotes.

in case, backticks aren't required since none of them reserved keywords.

as sidenote, query vulnerable sql injection if value(s) of variables came outside. please take @ article below learn how prevent it. using preparedstatements can rid of using single quotes around values.


Comments

Post a Comment

Popular posts from this blog

linux - xterm copying to CLIPBOARD using copy-selection causes automatic updating of CLIPBOARD upon mouse selection -

i've tried various ways coerce xterm (versions 285 , 292) copy selection clipboard clipboard whenever press ctrl-shift-c. promising way far has been, in ~/.xresources, put this: xterm*vt100.translations: #override \ ctrl shift <keypress> c: copy-selection(clipboard) \n\ ctrl shift <keypress> v: insert-selection(clipboard) ctrl-shift-v works perfectly, copying has nuance... if restart xterm, highlighting text puts things in primary clipboard; expected, proper, default behavior. if hit ctrl-shift-c, copies current selection clipboard clipboard. the bug, however, if highlight text after first time pressed ctrl-shift-c, you'll see highlighting copies both primary and clipboard. cannot figure out how stop xterm updating clipboard upon selection... , doesn't make sense me in first place. i said, @ specific point in time, copy selection clipboard... yet starts updating automatically upon selection after doing once... anyone have workaround...
Read more

qt - Errors in generated MOC files for QT5 from cmake -

i generated moc files qt5 using set (cmake_automoc on) set(cmake_include_current_dir on) then add moc files src using set(src src/main.cpp src/video_widget_surface.cpp src/video_widget.cpp src/video_player.cpp #moc files moc/moc_video_player.cpp moc/moc_video_widget.cpp moc/moc_video_widget_surface.cpp finally add executable using add_executable(somegui ${src}) but errors in moc files saying : /other/workspace/perception/somestuff/moc/moc_video_widget.cpp:54:6: error: 'videowidget' has not been declared /other/workspace/perception/somestuff/moc/moc_video_widget.cpp:62:19: error: 'videowidget' has not been declared /other/workspace/perception/somestuff/moc/moc_video_widget.cpp:68:20: error: 'videowidget' has not been declared /other/workspace/perception/somestuff/moc/moc_video_widget.cpp:68:46: error: non-member function 'const qmetaobject* metaobject()' cannot have cv-qualifier /other/qt5.0.1/5.0.1/gcc_64/include/qtcore/qo...
Read more