Regarding boolean datatype

Hello all,

this is my first interaction with this list. I have a
problem. I was using MSSQL Server as db, now i m
changing to Postgres. I know that the bit type in
MSSQLserver is boolean in Postgres. 

So, i have the following query and getting the
following error:Why???

strSql    = " Update parts Set name = ? , description = ?
world_market = ?, part = ? , unit_of_measure = ? 
Where depot= ?;

prepStmt = conn.prepareStatement(strSql);
prepStmt.setString( 1, Pname) ;
prepStmt.setString( 2, Pdesc) ;
prepStmt.setBoolean(3, BoolWM) ;
prepStmt.setString( 4, strPart);
prepStmt.setString( 5, strUoM);
prepStmt.setString( 6, strDepot);

This is how i m assigning value to BoolWM,

boolean BoolWM ;if ( WM.equals("False")) {    BoolWM = false ; } else {    BoolWM = true; }

Error is:::

SQLError ERROR:  Unable to identify an operator '~~'
for types 'boolean' and 'unknown'
You will have to retype this query using an explicit
cast                        

I know, somewhere i m making mistake, but where??
Moreover, if i m updating the database with the above
query, the db is giving the error and deleting the
data from the db. As per my understanding it should
automatically rollback. What is the problem???

What are the other coding rules for Postgres??

Please guide.
Thanks and regards

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