erlang table calculator

Zhangchangchang1, problem descriptionThe Erlang side writes an Oracle table through ODBC, and Java uses the JDBC driver to write the table, which is locked when the write operation occurs multiple times.2. Problem solvingIdea: Using the adapter principle, suitable for Erlang and Java database connection, let

Both ETS and process dictionaries are unique to Erlang.ETS is an acronym for Erlang term Storage, a memory-based KV (Key Value) Table that supports large data volumes and efficient queries.To use the ETS table, you first need to create a new ETS table.1.ets:new (? Ets_sys_building,[{keypos, #ets_sys_building. Sysbuildi

+'. Erl'f.close ()#Close Channel returndefStart_gen ():#Delete old dataDelnames = Os.listdir ('./server') forDelnameinchDelnames:os.remove ('./server/'+delname)Print 'Delete old file:', Delname for_, _, filenamesinchOs.walk ('./dataxlsx'):#Traverse Folder forFileNameinchFilenames#traversing FilesFind = Filename.find ('. xlsx')#returns the file name length#print "Find is:", find ifFilename[0] = ='~' orfind = =-1:#The file name starts with ' ~ ' or cannot find the file n

,ireland,tester}]3. Match_delete Delete Matching output14> NewTab = Ets:match_delete (countries,{' _ ', Ireland, ' _ '}).TrueThird, the extraction table information filteringEts:select1, with matching specifications to do parametersEts:select (countries,[{{' $ ', ' $ $ ', ' $ $ '},[{'/= ', ' $ $ ', cook}],[[' $ $ ', ' $ ']}]).{' $ ', ' $ $ ', ' $ $ '} mode{'/= ', ' $ $ ', cook} protector[' $ $ ', ' $ '] returns an expression2. Return the matching prot

://s3.51cto.com/wyfs02/M00/4C/DD/wKioL1RG_6mSU-tCAACeljaXf_0782.jpg "style =" float: none; "Title =" esproc_programm_seqtseq2_10.jpg "alt =" wKioL1RG_6mSU-tCAACeljaXf_0782.jpg "/> Integration: Assume that orders with more than 1000 orders are called large orders, and orders with a unit price greater than 10000 are called important contracts. Please find out: ① orders are both large orders and important orders; ② and other orders: 650) This. width = 650; "src =" http://s3.51cto.com/wyfs02/M00/4C/

(Edittext.gettext (). toString ()));//Save the value of the display area and calculate}Save the operator you clicked onLastcommand = Inputcommand;Clearflag = true;//Because I've already entered the operator here,}}}Method of calculationprivate void Calculate (Double x) {if (lastcommand.equals ("+")) {result + = x;} else if (Lastcommand.equals ("-")) {Result-= x;} else if (Lastcommand.equals ("*")) {Result *= x;} else if (Lastcommand.equals ("/")) {Result/= x;} else if (lastcommand.equals ("="))