php - MySQL tricky multiple row insert/update into two tables -


there 2 tables following columns:

table1 (id1, id2)  //pairs (id1, id2) - unique  table2 (id2, name) //id2 - auto incrementing, name - string

from php have 100-300 pairs (id1, name) have inserted tables following conditions:

  1. some (id1, id2) pairs can not yet in table1, 'name' in table2. in case table1 has filled corresponding id1, id2.
  2. if (id1, id2) pair in table1 - 'name' in table2 has updated, if not same.

how accomplish performance in mind?

ps: can not use foreign keys or fuse tables

edit: here example, demonstrate logic

given 100-300 pairs of (id1,name):

id1   |  name --------------  5    |  name0 10    |  name1 20    |  name2 30    |  xxxxx

tables table1 , table2 either empty or contain records:

table1:                 table2: id1   |  id2            id2   |  name --------------          ----------------  5    |  0              0     |  name0       |                 1     |  name1 30    |  2              2     |  yyyyy

after insertion of given pairs tables should contain:

table1:                 table2: id1   |  id2            id2   |  name --------------          ----------------  5    |  0              0     |  name0      <-not touched 10    |  1              1     |  name1      <-table1 updated 30    |  2              2     |  xxxxx      <-changed name 20    |  3              3     |  name2      <-inserted both tables


Comments

Post a Comment

Popular posts from this blog

.htaccess - First slash is removed after domain when entering a webpage in the browser -

sometimes when hit address of webpage in browser, removes first slash after domain. examples: www.mywebsite.com/scripts/script_6.php -> trying load www.mywebsite.comscripts/script_6.php www.mywebsite.com/test.php -> trying load www.mywebsite.comtest.php after entering again, loads page. a .htaccess settings must wrong: rewritebase / errordocument 404 http://www.mywebsite.com/oops.php errordocument 401 /notallowed.php rewriteengine on # turn on rewriting engine #gzip <ifmodule mod_deflate.c> addoutputfilterbytype deflate text/text text/html text/plain text/xml text/css application/x- javascript application/javascript </ifmodule> #end gzip rewritecond %{http_host} ^mywebsite\.com rewriterule ^(.*)$ http://www.mywebsite.com$1 [r=permanent,l] directoryindex index6.php rewriterule ^termsofuse/?$ termsofuse.php [nc,l] # handle requests "adpolicy" rewriterule ^privacy-policy/?$ privacy-policy.php [nc,l] # handle requ...
Read more

Socket.connect doesn't throw exception in Android -

if put nonsense url no exception thrown , none of rest of code executed not rest of asynctask called method connects. try { socketcliente.connect(new inetsocketaddress("f", port), 2000); } catch (unknownhostexception e) { geterror("host doesn't exist"); return -1; } catch (ioexception e) { geterror("could not connect: host down"); return -1; } add catch statement. catch ( exception e ) { log.d(tag, e.getmessage(),e); toast.maketext(getapplicationcontext(), "unexpected error:" + e.getmessage(), toast.length_long).show(); } this write log , pop toast tell what's going on.
Read more

SPSS keyboard combination alters encoding -

my question not have programming practical issue on spss. accident keyword combination cannot remember because did not intend press changed encoding in spss , text in data in different language english shown small boxes. nevertheless, when kind of analysis performed different language text shown in output. does know reason? tried change encoding did not produce result. first, @ edit > options , see whether setting unicode or locale. might fix it. if have text in multiple languages, want unicode. otherwise, may have specific locale set wrong. can change set locale, need know locale want use.
Read more