mysql - Using Groovy's ${...} with SQL -


i have question using string in jdbc sql query. here 2 examples , expect both work, don't.

working version ...

    tabl  = "action"     query = "show full columns `action`;"       println "   "+ query     dbconnection.eachrow( query ){

in error variant:

    tabl  = "action"     query = "show full columns `${tabl}`;"     println "   "+ query     dbconnection.eachrow( query ){

the error comes sql syntax error. can see statements textually identical.

the output show statement, error:

   show full columns `action`;    may 20, 2013 10:52:01 groovy.sql.sql eachrow    warning: failed execute: show full columns `?`; because:        parameter index out of range (1 > number of parameters, 0).    may 20, 2013 10:52:01 groovy.sql.sql eachrow

i think that's groovy trying culprit. when feed literal string jdbc connection works fine 'action' table.

i'm hoping can explain error , offer fix.

for reading, found option workaround:

query = "show full columns `"+ tabl.tostring() +"`;"

while there might less verbose option, using "+"; me feels if using ${tabl} should work.

thanks in advance,

i think problem when use in-string variable produces different object type when don't use it. 1 string, other gstring.

e.g., see script , output:

def = "123" def b = "abc"+a def c = "abc${a}" println b.class println c.class  >>  class java.lang.string class org.codehaus.groovy.runtime.gstringimpl

it seems eachrow function sensitive difference reason. 2 functions you're using are

but can't see why they'd behave differently..

another workaround call tostring on query variable - cast string:

def d = c.tostring() println d.class  >>  class java.lang.string

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