SELECT * FROM (SELECT ? FROM DUAL) fails

[Boris Granveaud]

Hello,

I have a problem with the following statement:

SELECT * FROM (SELECT ? FROM DUAL)

it gives this error with H2 1.4.191:

org.h2.jdbc.JdbcSQLException: Unknown data type: """?1"""; SQL statement:

SELECT * FROM (SELECT ? FROM DUAL) [50004-192]

at org.h2.message.DbException.getJdbcSQLException(DbException.java:345)

at org.h2.message.DbException.get(DbException.java:179)

at org.h2.message.DbException.get(DbException.java:155)

at org.h2.table.Table.setColumns(Table.java:425)

at org.h2.table.TableView.initColumnsAndTables(TableView.java:220)

at org.h2.table.TableView.init(TableView.java:98)

at org.h2.table.TableView.<init>(TableView.java:65)

at org.h2.table.TableView.createTempView(TableView.java:535)

at org.h2.command.Parser.readTableFilter(Parser.java:1168)

Code to reproduce:

PreparedStatement st = cnx.prepareStatement("SELECT * FROM (SELECT ? FROM DUAL)");
st.setTimestamp(1, new Timestamp(System.currentTimeMillis()));
rs = st.executeQuery();
rs.next();
System.out.println(rs.getObject(1));
rs.close();
st.close();

"SELECT ? FROM DUAL" works fine.

The problems is that the type of the parameter cannot be known when the statement is prepared so I'm not sure how the parser should deal with that.

Boris.

[Thomas Mueller Graf]

Hi,

You could use "cast":

SELECT * FROM (SELECT CAST(? AS VARCHAR) FROM DUAL)

--
You received this message because you are subscribed to the Google Groups "H2 Database" group.
To unsubscribe from this group and stop receiving emails from it, send an email to h2-database+unsubscribe@googlegroups.com.
To post to this group, send email to h2-da...@googlegroups.com.
Visit this group at https://groups.google.com/group/h2-database.
For more options, visit https://groups.google.com/d/optout.