sql server jdbc查询datetime列

Question

I've looked around and could not seem to find this asked specifically, on SO, but I've found similar questions like this one and lots of questions regarding SQL itself or C#...

Here is what I am seeing:

MapSqlParameterSource parameterSource = new MapSqlParameterSource();
        //parameterSource.addValue( "insertDate", DateTime.now().minusHours( 1 ).toGregorianCalendar(), Types.TIME );
        parameterSource.addValue( "insertDate", new Timestamp( DateTime.now().minusHours( 1 ).getMillis() ) );

        List< String > contents =
            _simpleJdbcTemplate
                .query(
                    "SELECT TOP (200) inserteddatetime, Contents FROM dbo.tsomeTable WHERE (ServiceName = 'something') and inserteddatetime > :insertDate",
                    new RowMapper< String >() {
                        @Override
                        public String mapRow( final ResultSet rs, final int rowNum ) throws SQLException {
                            System.out.println( rs.getTimestamp( "inserteddatetime" ) );

                            return rs.getString( "Contents" );
                        }
                    }, parameterSource );

The query "hangs"\\does nothing\\never returns if:

1. I use the uncommented Timestamp object (as presented above)
2. I replace the parameterSource object with DateTime.now().minusHours( 1 ).toGregorianCalendar() or DateTime.now().minusHours( 1 ).toGregorianCalendar().getTime()
3. I try the commented out line, but change the type to Timestamp

So, here is my question or questions...

Is there a known bug\\issue with querying on datetime columns in sql server?

Why do I have to use Time and not Timestamp ?

I suspect that Spring is converting the date objects over to Timestamp when I query with the object directly (as demonstrated in #2).

Answer 1

1. TIMESTAMP is a server-generated value used to help with data consistency , its not a simple data type, so for storing datetime value , avoid TIMESTAMP datatype.

2. Also, SQL Server TIMESTAMP is confusing , and it's deprecated . It is replaced by the ROWVERSION keyword , which should reduce confusion.