mysql - Table insert unexisting values -

-

current situation tblgamepoints

id    gamenumber    playerid    game    points ----------------------------------------------- 1     1                       fps     150 2     1             b           fps     150 3     2                       fps     100 4     2             b           fps     75

when starting gamenumber 3 add empty rows of game in case not allready have points (penalty points).

example 1:

id    gamenumber    playerid    game    points ----------------------------------------------- 1     1                       fps     150 2     1             b           fps     150 3     2                       fps     100 4     2             b           fps     75

in example above, there aren't existing rows gamenumber 3 insert statement should insert games points 0 playerids

example 2:

id    gamenumber    playerid    game    points ----------------------------------------------- 1     1                       fps     150 2     1             b           fps     150 3     2                       fps     100 4     2             b           fps     75 5     3                       fps     -50

in example 2 player allready has been awarded penalty points. insert should add gamenumber 3 rows players except allready have row 'gamenumber 3'.

current sql statement used

insert tblgamepoints(gamenumber,playerid,game,points)      select 3,tblplayer.id,'fps',0      tblplayer          left join tblgamepoints on tblplayer.id = tblgamepoints.playerid      tblplayer.game='fps' , validatedentry='1'          , ifnull(tblgamepoints.gamenumber, 0) <> 3

current result of sql statement used adds entries games instead of game 3. adds 5-6 records in example instead of 1 or 2.

using not exists condition seems easier me:

insert tblgamepoints (gamenumber, playerid, game, points)  select      3, tblplayer.id, 'fps', 0         tblplayer        game = 'fps' ,              validatedentry='1' ,              not exists (select *                           tblgamepoints                          playerid = tblplayer.id , game = 3)

Comments

Post a Comment

Popular posts from this blog

python - No exponential form of the z-axis in matplotlib-3D-plots -

-
Image
i have similar problem described in how prevent numbers being changed exponential form in python matplotlib figure : i don't want (in special case) weird scientific formatting of axis. problem different have problem @ z -axis. 2-d plots can use ax.get_yaxis().get_major_formatter().set_useoffset(false) . , there no function ax.get_zaxis() what use format z -axis same way? edit: example: from mpl_toolkits.mplot3d import axes3d import numpy np import sys import matplotlib import matplotlib.pyplot pyplot def func(xi, ti): res = 10e3 + np.cos(ti) * np.sin(xi) return res if __name__ == '__main__': timespacing = 20 timestart = 0 timeend = 1 time = np.linspace(timestart, timeend, timespacing) widthspacing = 50 widthstart = 0 widthend = 3 width = np.linspace(widthstart, widthend, widthspacing) reslist = [] matplotlib.rcparams['legend.fontsize'] = 10 fig = pyplot.figure() ax = fig.gca(projection = '3d...
Read more

php - Best Light server (Linux + Web server + Database) for Raspberry Pi -

-
i install web server database on raspberry pi (little computer). computer has 1gb ram. i want know best combination: linux distribution , web server , dbms run local server multiple users minimal latency, use php on server. , best settings performance , not have bugs (memory usage, disable plugin, disable service, etc)? i thought light debian , lighttpd server , sqlite database. solution? i think lighttpd + sqlite great choice. linux distro, debian @ centos or tiny core linux , although i'm not sure of compatibility pi. obviously, can't go wrong raspbian if want use in production , more stable performance, few more pi's , set them in cluster .
Read more

c# - "Newtonsoft.Json.JsonSerializationException unable to find constructor to use for types" error when deserializing class -

-
i developing app in xamarin android. have splash screen serialize class , pass mainactivity using intent . when try deserialize in mainactivity error message : "serializationexception unable find constructor use types" serialization : void loaddata() { currency currency = new currency(this); intent = new intent(this, typeof(mainactivity)); intent.putextra("currency", newtonsoft.json.jsonconvert.serializeobject(currency)); startactivity(intent); } deserialization : cur = newtonsoft.json.jsonconvert.deserializeobject<currency> (intent.getstringextra("currency")); // error here class constructor : public currency(context context) { thiscontext = context; } i began experiencing problem after added parameter context context constructor. has caused this? how can solve it? possible serialize/deserialize class has parameters? you need have empty constructor in currency class in order deserialize it. ...
Read more