join - MySQL query to return custom structure with values as field type and titles -

-

sorry bizarre title, isn't easy summarize want achieve. goal have general table structure store "any" kind of data, , make it... describe itself, custom table output of query.

i have table structure:

id (int) iditem (int) fieldtitle (varchar) field (varchar) value_label (varchar) value_text (text) value_bool (tinyint) value_int (int) value_float (float)

an example of data inside table:

id  iditem  fieldtitle  field       value_label     value_text              value_bool  value_int   value_float -------------------------------------------------------------------------------------------------------------- 1   15      title       value_label product 1  null                    null        null        null 2   15      description value_text  null            product...    null        null        null 3   15      visible     value_bool  null            null                    1           null        null 4   15      price       value_float null            null                    null        null        19.9 5   16      title       value_label product 2  null                    null        null        null 6   16      description value_text  null            hidden product. null        null        null 7   16      visible     value_bool  null            null                    0           null        null 8   16      price       value_float null            null                    null        null        30

i want end having this:

iditem (int) title  (varchar) description (text) visible (tinyint) price (float)

example of output data:

iditem  title           description             visible price 15      product 1  product...    1       19.9 16      product 2  hidden product. 0       30

although don't agree kind of schemas (see comment below question) can give try:

select iditem,   max(if(fieldtitle = 'title', value_label, null)) title,   max(if(fieldtitle = 'description', value_text, null)) description,   max(if(fieldtitle = 'visible', value_bool, null)) visible,   max(if(fieldtitle = 'price', value_float, null)) price t group iditem

this results in:

+--------+----------------+-------------------------+---------+-------+ | iditem |     title      |       description       | visible | price | +--------+----------------+-------------------------+---------+-------+ |     15 | my_product_one | very_good_product...    |       1 | 19.9  | |     16 | my_product_two | just_an_hidden_product. |       0 | 30    | +--------+----------------+-------------------------+---------+-------+

adding more fields straight forward. let me know if have ay issues it.


Comments

Post a Comment

Popular posts from this blog

jasper reports - Fixed header in Excel using JasperReports -

-
how can create excel report fixed header using japserreports? mean need header fixed when scroll excel file. this possible adding couple properties in jrxml file each report. take @ advanced excel features freeze panes. if wanted freeze after first column header (down left side basically) this: <statictext> <reportelement style="sans_bold" mode="opaque" x="0" y="60" width="104" height="20" forecolor="#ffffff" backcolor="#666666"> <property name="net.sf.jasperreports.export.xls.auto.filter" value="start"/> <property name="net.sf.jasperreports.export.xls.column.width" value="110"/> <property name="net.sf.jasperreports.export.xls.freeze.column.edge" value="left"/> </reportelement> &
Read more

media player - Android: mediaplayer went away with unhandled events -

-
i need duration of audio file series of voice announcements need play app. have added audio files resources , play fine. sample code below works perfect intended purpose: return duration of audio files. here code: float getdurationofaudioresource(locationenum loc, context context){ float duration = 0; try { mediaplayer mp; mp = mediaplayer.create(context, getaudioresource(loc)); duration = mp.getduration(); mp.release(); mp = null; } catch (illegalstateexception e) {e.printstacktrace(); logerror(25, "testdescitem:fault::could not open mediaplayer object audio resource.");} return duration; } here's weird thing. code called in main activity prepares set of audio instructions given test. there no errors within activity. second activity called, long string of errors on logcat. 03-07 13:23:43.820: i/actionlogger(21435): gentest_info_test #0 created. 03-07 13:23:43.830: i/actionlogger(21435): gente
Read more

python - ('The SQL contains 0 parameter markers, but 50 parameters were supplied', 'HY000') or TypeError: 'tuple' object is not callable -

-
import pyodbc,nltk,array cnxn = pyodbc.connect('driver={mysql odbc 5.1 driver};server=127.0.0.1;port=3306;database=information_schema;user=root; password=1234;option=3;') cursor = cnxn.cursor() cursor.execute("use collegedatabase ;") cursor.execute("select * sampledata ; ") cnxn.commit() s=[] j=[] x=[] words = [] w = [] sfq = [] pos=[] entry in cursor: s.append(entry.injury_type),j.append(entry.injury_desc) nltk.tokenize import punktwordtokenizer nltk.corpus import stopwords tokenizer = punktwordtokenizer() english_stops = set(stopwords.words('english')) in range(0,26): # filter stop words tokenizer.tokenize(j[i]) w.append([word word in tokenizer.tokenize(j[i]) if word not in english_stops]) in range(0 , 26):#converting tokenzied text ito string sfq.append(" ".join(w[a])) replacers import regexpreplacer replacer = regexpreplacer() in range (0,26):#pos tagging replacer.repl
Read more