Re: [sqlite] How to create a data of unsigned int?
On 7 Aug 2009, at 10:53am, liubin liu wrote: > I want to use a integer to save the ip address of ipv4. Because they > all are > 4 bytes. > > but it is better when the data type is unsigned int. You may find it better just to store an IP number as a string, or as four integers. Although it takes up more space you don't have to keep converting from one format to another. Simon. ___ sqlite-users mailing list sqlite-users@sqlite.org http://sqlite.org:8080/cgi-bin/mailman/listinfo/sqlite-users
Re: [sqlite] How to create a data of unsigned int?
SQLite doesn't support unsigned types. And int64 is not too wasting for you unless you work with negative numbers (which you are not because you work with unsigned numbers). It's because SQLite always does compacting of integer numbers - if number fits into 1 byte then it stores 1 byte, if it fits in 2 bytes then it stores 2 etc. So in your case it most probably will store 5 bytes which is not too bad. IIRC, only for negative numbers SQLite always uses 8 bytes. Pavel On Fri, Aug 7, 2009 at 9:11 AM, liubin liu<7101...@sina.com> wrote: > > Thanks, :) > > But now I think that's ok to use the int type to store the four byte. > Because I could get the value by using forced conversion. > > But Do SQLite3 support the unsigned type? > > And You know that int64 is too wasting here. > > > > Pavel Ivanov-2 wrote: >> >> int64 type is okay to store data of type unsigned int. And int64 is >> exactly the type used for all integers in SQLite. >> >> Pavel >> >> On Fri, Aug 7, 2009 at 5:53 AM, liubin liu<7101...@sina.com> wrote: >>> >>> I want to use a integer to save the ip address of ipv4. Because they all >>> are >>> 4 bytes. >>> >>> but it is better when the data type is unsigned int. >>> >>> How to create a data of unsigned int? >>> 1334 >>> 1335 // tcp->gate_addr[0]是地址的高8位 >>> 1336 for ( i=0, m=1; i<4; i++, m*=0x100 ) >>> 1337 gateaddr = gateaddr + tcp->gate_addr[3-i] * m; >>> 1338 >>> >>> -- >>> View this message in context: >>> http://www.nabble.com/How-to-create-a-data-of-unsigned-int--tp24861945p24861945.html >>> Sent from the SQLite mailing list archive at Nabble.com. >>> >>> ___ >>> sqlite-users mailing list >>> sqlite-users@sqlite.org >>> http://sqlite.org:8080/cgi-bin/mailman/listinfo/sqlite-users >>> >> ___ >> sqlite-users mailing list >> sqlite-users@sqlite.org >> http://sqlite.org:8080/cgi-bin/mailman/listinfo/sqlite-users >> >> > > -- > View this message in context: > http://www.nabble.com/How-to-create-a-data-of-unsigned-int--tp24861945p24864619.html > Sent from the SQLite mailing list archive at Nabble.com. > > ___ > sqlite-users mailing list > sqlite-users@sqlite.org > http://sqlite.org:8080/cgi-bin/mailman/listinfo/sqlite-users > ___ sqlite-users mailing list sqlite-users@sqlite.org http://sqlite.org:8080/cgi-bin/mailman/listinfo/sqlite-users
Re: [sqlite] How to create a data of unsigned int?
Thanks, :) But now I think that's ok to use the int type to store the four byte. Because I could get the value by using forced conversion. But Do SQLite3 support the unsigned type? And You know that int64 is too wasting here. Pavel Ivanov-2 wrote: > > int64 type is okay to store data of type unsigned int. And int64 is > exactly the type used for all integers in SQLite. > > Pavel > > On Fri, Aug 7, 2009 at 5:53 AM, liubin liu<7101...@sina.com> wrote: >> >> I want to use a integer to save the ip address of ipv4. Because they all >> are >> 4 bytes. >> >> but it is better when the data type is unsigned int. >> >> How to create a data of unsigned int? >> 1334 >> 1335 // tcp->gate_addr[0]是地址的高8位 >> 1336 for ( i=0, m=1; i<4; i++, m*=0x100 ) >> 1337 gateaddr = gateaddr + tcp->gate_addr[3-i] * m; >> 1338 >> >> -- >> View this message in context: >> http://www.nabble.com/How-to-create-a-data-of-unsigned-int--tp24861945p24861945.html >> Sent from the SQLite mailing list archive at Nabble.com. >> >> ___ >> sqlite-users mailing list >> sqlite-users@sqlite.org >> http://sqlite.org:8080/cgi-bin/mailman/listinfo/sqlite-users >> > ___ > sqlite-users mailing list > sqlite-users@sqlite.org > http://sqlite.org:8080/cgi-bin/mailman/listinfo/sqlite-users > > -- View this message in context: http://www.nabble.com/How-to-create-a-data-of-unsigned-int--tp24861945p24864619.html Sent from the SQLite mailing list archive at Nabble.com. ___ sqlite-users mailing list sqlite-users@sqlite.org http://sqlite.org:8080/cgi-bin/mailman/listinfo/sqlite-users
Re: [sqlite] How to create a data of unsigned int?
int64 type is okay to store data of type unsigned int. And int64 is exactly the type used for all integers in SQLite. Pavel On Fri, Aug 7, 2009 at 5:53 AM, liubin liu<7101...@sina.com> wrote: > > I want to use a integer to save the ip address of ipv4. Because they all are > 4 bytes. > > but it is better when the data type is unsigned int. > > How to create a data of unsigned int? > 1334 > 1335 // tcp->gate_addr[0]是地址的高8位 > 1336 for ( i=0, m=1; i<4; i++, m*=0x100 ) > 1337 gateaddr = gateaddr + tcp->gate_addr[3-i] * m; > 1338 > > -- > View this message in context: > http://www.nabble.com/How-to-create-a-data-of-unsigned-int--tp24861945p24861945.html > Sent from the SQLite mailing list archive at Nabble.com. > > ___ > sqlite-users mailing list > sqlite-users@sqlite.org > http://sqlite.org:8080/cgi-bin/mailman/listinfo/sqlite-users > ___ sqlite-users mailing list sqlite-users@sqlite.org http://sqlite.org:8080/cgi-bin/mailman/listinfo/sqlite-users
[sqlite] How to create a data of unsigned int?
I want to use a integer to save the ip address of ipv4. Because they all are 4 bytes. but it is better when the data type is unsigned int. How to create a data of unsigned int? 1334 1335 // tcp->gate_addr[0]是地址的高8位 1336 for ( i=0, m=1; i<4; i++, m*=0x100 ) 1337 gateaddr = gateaddr + tcp->gate_addr[3-i] * m; 1338 -- View this message in context: http://www.nabble.com/How-to-create-a-data-of-unsigned-int--tp24861945p24861945.html Sent from the SQLite mailing list archive at Nabble.com. ___ sqlite-users mailing list sqlite-users@sqlite.org http://sqlite.org:8080/cgi-bin/mailman/listinfo/sqlite-users
