查询适用于SQL * Plus，但不适用于jdbc程序

Question

I executed a query on sqlplus (Oracle 11g)

select Bookdetails.TITLE,Bookdetails.PRICE
from bookdetails
inner join orderdetails
ON BOOKDETAILS.BOOKID=ORDERDETAILS.BOOKID
Where Orderdetails.username ='Divya.grg';

I got this output:

TITLE                                                             PRICE
------------------------------------------------------------ ----------
mastering c++                                                     876.2
construction material reference book 2nd edition                    332
let us c++                                                          793

But when I did the same query on a JDBC program:

PreparedStatement ps=conn.prepareStatement("select Bookdetails.TITLE,Bookdetails.PRICE"
  +"from bookdetails"
  +"inner join orderdetails"
  +"ON BOOKDETAILS.BOOKID=ORDERDETAILS.BOOKID"
  +"Where Orderdetails.username ='"+username+"'");
ResultSet rs=ps.executeQuery();

I am getting this exception:

>java.sql.SQLSyntaxErrorException: ORA-00923: FROM keyword not found where expected

Now why would this happen? If sqlplus is executing this without any problem then why would the exception be thrown in program?

Answer 1

Place spaces at the beginnings of your lines you're concatenating to create your query in Java, or else the lines you're concatenating will run the query together as:

select Bookdetails.TITLE,Bookdetails.PRICEfrom bookdetailsinner join orderdetails...

when you want

select Bookdetails.TITLE,Bookdetails.PRICE from bookdetails inner join orderdetails...