java - JDBC ERROR: operator does not exist: date = integer - 


    string checkavailable_flight = string.format("select flightid, flightdate,"             + " origin, destination flight"             + "  flightdate::date = %s  , origin = %s"             + " , destination = %s;", date_, origin_, destination_);      resultset rs = stmt.executequery(checkavailable_flight);      if (!rs.next()) {          system.out.println("no data inserted");     } else {          {             int flightid = rs.getint("flightid");             string date = rs.getstring("flightdate");             string origin = rs.getstring("origin");             string destination = rs.getstring("destination");              system.out.printf("%-10d %5s %5s %7s\n",flightid, date, origin, destination);          } while (rs.next());     }

error(s) occurred:

sqlexception : error: operator not exist: date = integer   hint: no operator matches given name , argument type(s). might need add explicit type casts.   position: 86 sqlstate : 42883 sqlcode : 0

hello, working on jdbc , wanna execute sql query , print out table ..but got error above..

i try casting flightdate in way, like:

cast(flightdate text) '2013-04-12%'

but error still occurred....

any suggestion appreciate it..

i'm guessing dates being substituted in without quoting, 2012-01-01 instead of '2012-01-01'. 2012-01-01 integer mathematical expression results in number 2010, you're comparing date integer. need quote dates, or better, use proper prepared statements.

why used prepared statements?

to demonstrate think code's problem is, think you're doing this:

regress=> select date '2012-03-12' = 2012-03-12; error:  operator not exist: date = integer line 1: select date '2012-03-12' = 2012-03-12;                                  ^ hint:  no operator matches given name , argument type(s). might need add explicit type casts.

observe:

regress=> \x expanded display on. regress=> select                2012-03-12 unquoted,               pg_typeof(2012-03-12) unquotedtype,               '2012-03-12' quoted,               pg_typeof('2012-03-12') quotedtype,                date '2012-03-12' typespecified,               pg_typeof(date '2012-03-12') typespecifiedtype; -[ record 1 ]-----+----------- unquoted          | 1997 unquotedtype      | integer quoted            | 2012-03-12 quotedtype        | unknown typespecified     | 2012-03-12 typespecifiedtype | date  (1 row)

if won't use prepared statements, replace %s date '%s', please use prepared statements.

can add statement print contents of checkavailable_flight after formatting, paste output here confirm or refute guess?


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