diffence in float field value (via ingres tools v/s odbc )

[rajesh_sangawat]

i have install third party software benticSQALL client software and using ODBC oledb for ingres conntion.

every think i found ok except float field value.

a)
when i fire query through
ingres isql in unix platform
i found

unix ingres isql
----------------
select gross_wt from zzpallet_mst
52.940

b)
when i fire query in windows ingres isql

select gross_wt from zzpallet_mst
52.940

c)
when i fire query in bentic client software

benticSQALL client software (using ODBC oledb)
---------------------------------------------
select gross_wt from zzpallet_mst
52.939998626709

i found diffrenct value for this field value
why this difference happened ?
wheather ingress store valie 52.940 as in actual 52.939998626709 at table level.
so third part tools capture the same value and show to us?

please help how i will correct this.


i thunk that
some one using application via ODBC conntion
they will also get this wrong value.
how they correting this

regards
rajesh sangawat

[denjo02]

This is the nature of the float datatype. If load up two rows into a table, with floats containing values of 52.94 and 52.939998626709 then by default, isql will show both of them as 52.940

If however I start up ISQL using the -f8F20.15 flag to control the precision and scale of floats being displayed, these two rows are returned with these values:
52.940000000000000
52.939998626709000

These are both accurate.

I suspect that your ODBC application is not doing any rounding of the float. What value do you see if you use this -f flag with isql?

[kschendel]

To add to John's reply, the Ingres supplied tools (isql, qbf, etc) default to rounding floats to 3 decimal places. That's why you are seeing a rounded value from isql. The float value stored in the table is not rounded.

[rajesh_sangawat]

Originally Posted by kschendel

To add to John's reply, the Ingres supplied tools (isql, qbf, etc) default to rounding floats to 3 decimal places. That's why you are seeing a rounded value from isql. The float value stored in the table is not rounded.

i agree with you that ingres rounding float value to 3 decimal value as define in ingres files/*.def files. these value can be view by ingres tools isql.

Can we suggest setting so that odbc tools can get default three digit fload value by default

thnaks for your help

[rhann]

ODBC is an interface so it shouldn't ever mess with data in transit. The way the myriad ODBC-based tools display that data is up to their respective vendors/developers.

Your best option is to do as denjo02 suggested and use the -f4... and -f8... flags to select the display format of the Ingres tools.

[Maria2009]

Originally Posted by rhann

ODBC is an interface so it shouldn't ever mess with data in transit. The way the myriad ODBC-based tools display that data is up to their respective vendors/developers.

Your best option is to do as denjo02 suggested and use the -f4... and -f8... flags to select the display format of the Ingres tools.

Interesting thought, i completely agree with your perspective

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