c++ - Custom size integers in MySQL and Sparksee databases -

-

is there way define type of integers, 7 bits long? or @ least 1 byte long? want replace standard integers stored in database reduce size. using databases: mysql, sparksee (for graphs). , languages: c++, objective-c++. using char instead of int - best option?

mysql supports tinyint (8 bit), smallint (16 bit), mediumint (24 bit), int (32 bit), , bigint (64 bit) data types. http://dev.mysql.com/doc/refman/5.7/en/integer-types.html

the corresponding c language data types int8_t, int16_t, int32_t, , int64_t. there isn't standard 24-bit data type in c. see more information. http://www.nongnu.org/avr-libc/user-manual/group__avr__stdint.html

these signed data types. so, example, int8_t has potential values in range [-128, 127].

you need large number of records in system cost saving using smaller integers exceed 1 dollar us. ssd drives cost less $0.50 per gigabyte. best spend time , effort elsewhere.


Comments

Post a Comment

Popular posts from this blog

python - cx_oracle unable to find Oracle Client -

-
i have installd python 2.7.3 on linux 64 bit machine. have oracle 11g client(64bit) installed. , set oracle_home, path, ld_library_path, , installed cx_oracle 5.1.2 version python 2.7 & oracle 11g. ldd command on cx_oracle unable find libclntsh.so.11.1. i tried creating symlinks libclntsh.so.11.1 under /usr/lib64, updated oracle.conf file under /etc/ld.so.conf.d/. tried possible solutions have been discussed on issue on forums, no luck. please let me know missing. the issue me installed python, cx_oracle root oracle client installation done "oracle" user. got own oracle installation , fixed issue. later ran pyunicodeucs4_decodeutf16 issues python , had install python —enable-unicode=ucs4 option
Read more

Delphi XE2 Indy10 udp client-server interchange using SendBuffer-ReceiveBuffer -

-
i use delphi xe2 , indy10 udp protocol. can't receive server echo on client side if use receivebuffer method. got "socket error # 10040" although send small echo message server client. console application illustrate problem below. in advance. program project1; {$apptype console} {$r *.res} uses system.sysutils, idglobal, idbasecomponent, idcomponent, idsockethandle, idudpclient, idudpserver, idudpbase, idstack; type tudp_serv = class(tidudpserver) procedure udpsvudpread(athread: tidudplistenerthread; adata: tidbytes; abinding: tidsockethandle); end; var udpserver: tudp_serv; udpcl: tidudpclient; bsnd, brcv: tbytes; s: string; k: integer; //============================================================================== procedure tudp_serv.udpsvudpread(athread: tidudplistenerthread; adata: tidbytes; abinding: tidsockethandle); begin writeln(' server read: ' + tohex(adata, length(adata))); abinding sendto(peerip, peerport, adat...
Read more

Qt ActiveX WMI QAxBase::dynamicCallHelper: ItemIndex(int): No such property in -

-
i new windows programming. here goes code objiwbemlocator = new qaxobject("wbemscripting.swbemlocator"); objwmiservice = objiwbemlocator->querysubobject("connectserver(qstring&,qstring&)",qstring("."),qstring("root\\cimv2")); qaxobject* returnlist = objwmiservice->querysubobject("execquery(qstring&)", qstring("select * %1").arg(domain)); qaxobject* result = returnlist->querysubobject("itemindex(int)", 0); i getting error on runtime qt activex wmi qaxbase::dynamiccallhelper: itemindex(int): no such property in but itemindex method exists msdn says the itemindex method not work collections not contain swbemobjects, such swbemmethodset, swbemnamedvalueset, swbemprivilegeset, swbempropertyset, , swbemqualifierset. what selecting ? have tried iterating on collection ? plus need minimum windows vista itemindex method. hope helps
Read more