PreparedStatement like 预编译

Connection conn = getConnection();
PreparedStatement ps = conn.prepareStatement("select * from student t where t.name like ?");
ps.setString(1, "%张%");
ResultSet rs = ps.executeQuery();
while (rs.next()) {
	System.out.println(rs.getString(2));
}

setXXX(index,value)就是把value放在index的位置上