stored procedures - MySQL - SELECT col, function(col) WHERE IN (..) returns same value -

-

i have defined function calculates nearest item using haversine formula. function works correctly when execute query in ad-hoc fashion such as: 

select concat(address, ", ", deadline, ", nc") addr tbltickets ticket = 'a152012363' limit 1 @address; select lat, lng addressgeocode address = @address limit 1 @lat, @lng; select round(( 3959 * acos( cos( radians(@lat) ) * cos( radians( startlat ) ) * cos( radians( startlon ) - radians(@lng) ) + sin( radians(@lat) ) * sin( radians( startlat ) ) ) ) * 5280.0 ) distance tblasbuiltpolys order distance limit 1 @ret; select @ret

when place logic in function can re use it, result same until start session.

i thought issue was using session variables adjusted function this:

create function `getticketbuffer`(`ticket` varchar(50))     returns double     language sql     not deterministic     reads sql data     comment '' begin declare addr varchar(250) default null; declare lt double default null; declare lg double default null; declare ret double default null;  set addr = (select concat(address, ", ", deadline, ", nc") addr tbltickets ticket = ticket limit 1); select lat, lng lt, lg addressgeocode address = address limit 1; set ret = (select round(( 3959 * acos( cos( radians(lt) ) * cos( radians( startlat ) ) * cos( radians( startlon ) - radians(lg) ) + sin( radians(lt) ) * sin( radians( startlat ) )     ) ) * 5280.0 ) distance     tblasbuiltpolys     order distance     limit 1); return ret; end

i pulling hair out trying make work following query execute correctly.

select ticket, getticketbuffer(ticket) d  tbltickets ticket in ("a152012363","c152011366","a152012358","c152011309","a152012353","a152011315");

when exectute logic directly in query following:

mysql> select round(( 3959 * acos( cos( radians(@lat) ) * cos( radians( startlat ) ) * cos( radians( startlon ) - radians(@lng) ) + sin( radians(@lat) ) * sin( radians( startlat ) ) ) ) * 5280.0 ) distance -> tblasbuiltpolys -> order distance -> limit 1 @ret; query ok, 1 row affected (0.02 sec)  mysql> select @ret     -> ; +------+ | @ret | +------+ |  130 | +------+ 1 row in set (0.00 sec)  mysql> mysql> select ticket, getticketbuffer(ticket) d tbltickets ticket in("a152012363","c152011366","a152012358","c152011309","a152012353","a152011315"); +------------+------+ | ticket     | d    | +------------+------+ | a152011315 |   81 | | a152012353 |   81 | | a152012358 |   81 | | a152012363 |   81 | | c152011309 |   81 | | c152011366 |   81 | +------------+------+ 6 rows in set (0.12 sec)

i trying "ticketbuffer" each ticket in list of tickets, if can made view, work well.

does see obvious mistakes? not expert @ sql, particularly stored functions/procedures sure can done better way.


Comments

Post a Comment

Popular posts from this blog

python - Healpy: From Data to Healpix map -

-
Image
i have data grid rows represent theta (0, pi) , columns represent phi (0, 2*pi) , f(theta,phi) density of dark matter @ location. wanted calculate power spectrum , have decided use healpy. what can not understand how format data healpy use. if provide code (in python obvious reasons) or point me tutorial, great! have tried hand @ doing following code: #grid dimensions nrows*ncols (subject change) theta = np.linspace(0, np.pi, num=grid.shape[0])[:, none] phi = np.linspace(0, 2*np.pi, num=grid.shape[1]) nside = 512 print "pixel area: %.2f square degrees" % hp.nside2pixarea(nside, degrees=true) pix = hp.ang2pix(nside, theta, phi) healpix_map = np.zeros(hp.nside2npix(nside), dtype=np.double) healpix_map[pix] = grid but, when try execute code power spectrum. specifically, : cl = hp.anafast(healpix_map[pix], lmax=1024) i error: typeerror: bad number of pixels if point me tutorial or edit code great. more specifications: data in 2d np array , can change numrows/
Read more

c - Bitwise operation with (signed) enum value -

-
i using enumerator values flags: typedef enum { = 0x00, b = 0x01u, // u has no influence, expected c = 0x02u, // u has no influence, expected ... } enum_name; volatile unsigned char* reg = someaddress; *reg |= b; according misra-c:2004 bitwise operations shall not done signed type. unfortunately, compiler iar use signed int (or short or char) underlying type of enums, , option can find relates size, not signedness ("--enum-is-int"). according iar c/c++ development guide arm , pages 169 , 211, can define type of enum s if enable iar language extensions ( -e command-line option, or project > options > c/c++ compiler > language > allow iar extensions in ide). in particular, should define "sentinel" value, make sure compiler chooses correct type. prefers signed types, , uses smallest possible integer type, sentinel should largest positive integer corresponding unsigned integer type can describe. example, typedef enum
Read more

xslt - Unnest parent nodes by child node -

-
in xml there items 0-n attributes , item should copied each attribute new item 1 attribute. given xml this: <?xml version="1.0" encoding="utf-8" ?> <items> <item> <name>a</name> <attributes> <attribute> <key>attribute1</key> <value>1</value> </attribute> </attributes> </item> <item> <name>b</name> </item> <item> <name>c</name> <attributes> <attribute> <key>attribute1</key> <value>5</value> </attribute> <attribute> <key>attribute2</key> <value>2</value> </attribute> <attribute> <key>attri
Read more