I have a db table say, persons in Postgres handed down by another team that has a column name say, “first_Name”. Now am trying to use PG commander to query this table on this column-name. select * from persons where first_Name=”xyz”; And it just returns ERROR: column “first_Name” does not exist Not sure if I … Read more
I am reading for SCJP and I have a question regarding this line: Identifiers must start with a letter, a currency character ($), or a connecting character such as the underscore ( _ ). Identifiers cannot start with a number! It states that a valid identifier name can start with a connecting character such as … Read more
Why am I getting this exception? package com.domain.idea; import javax.persistence.CascadeType; import javax.persistence.Entity; import javax.persistence.FetchType; import javax.persistence.JoinColumn; import javax.persistence.OneToOne; import javax.persistence.Table; import org.hibernate.annotations.AccessType; /** * object model for the view [InvestmentReturn].[vMAE_MFE] */ @Entity @Table(name=”vMAE_MFE”, schema=”InvestmentReturn”) @AccessType(“field”) public class MAE_MFEView { /** * trade property is a SuggestdTradeRecommendation object */ @OneToOne(fetch = FetchType.LAZY , cascade = { … Read more
One of my kids is taking Java in high school and had this on one of his tests: Which of the following is a valid identifier in Java? a. 123java b. main c. java1234 d. {abce e. )whoot He answered b and got it wrong. I looked at the question and argued that main is … Read more
What’s the Hi/Lo algorithm? I’ve found this in the NHibernate documentation (it’s one method to generate unique keys, section 5.1.4.2), but I haven’t found a good explanation of how it works. I know that Nhibernate handles it, and I don’t need to know the inside, but I’m just curious. 5 s 5
Can someone please explain the exact meaning of having single and double leading underscores before an object’s name in Python, and the difference between both? Also, does that meaning stay the same regardless of whether the object in question is a variable, a function, a method, etc.? 1 17
