asterisk db query

extension.conf

[subBalance]
exten=>751,1,Answer()
        same=>n(auth),Set(ID=${ODBC_AUTHUSER(${EXTEN}, 1234)});send the exten & PIN of this caller and get their ID
        same=>n,NoOp(the ID is ${ID})
        same=>n,GotoIf($[${ISNULL(${ID})}]?auth:getbalance);request to enter pin again else get their current balance
        same=>n(getbalance),Set(BALANCE=${ODBC_BALANCE(${ID})});send the ID of this user and get their balance
        same=>n,SayNumber(${BALANCE});tell user their current balance
        same=>n,Hangup()
//func_odbc.conf

[AUTHUSER]
dsn=asterisk
readsql=SELECT id FROM  `user_accounts`  where exten=${ARG1} and pin=${ARG2}

[BALANCE]
dsn=asterisk
readsql=SELECT balance FROM  `user_accounts`  where id= ${ARG1}

//mysql result
SQL result

Host: localhost
Database: asterisk
Generation Time: Oct 22, 2012 at 02:00 PM
Generated by: phpMyAdmin 3.5.2.2 / MySQL 5.5.25-log
SQL query: SELECT * FROM `user_accounts` LIMIT 0, 30 ;
Rows: 1

id	exten	pin	balance
1	50	1234	10000

//asterisk cli
Executing [751@local:2] Set("SIP/50-00000003", "ID=") in new stack
    -- Executing [751@local:3] NoOp("SIP/50-00000003", "the ID is ") in new stack
    -- Executing [751@local:4] GotoIf("SIP/50-00000003", "1?auth:getbalance") in new stack
    -- Goto (local,751,2)
    -- Executing [751@local:2] Set("SIP/50-00000003", "ID=") in new stack
    -- Executing [751@local:3] NoOp("SIP/50-00000003", "the ID is ") in new stack
    -- Executing [751@local:4] GotoIf("SIP/50-00000003", "1?auth:getbalance") in new stack
    -- Goto (local,751,2)