Top "Identifier" questions

An identifier is a name that identifies either a unique object or a unique class of objects.

What is the meaning of single and double underscore before an object name?

Can someone please explain the exact meaning of having leading underscores before an object's name in Python, and the difference …

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Hibernate throws org.hibernate.AnnotationException: No identifier specified for entity: com..domain.idea.MAE_MFEView

Why am I getting this exception? package com.domain.idea; import javax.persistence.CascadeType; import javax.persistence.Entity; import javax.…

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How to call on a function found on another file?

I'm recently starting to pick up C++ and the SFML library, and I was wondering if I defined a Sprite …

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PostgreSQL Error: Relation already exists

I am trying to create a table that was dropped previously. But when I do the CREATE TABLE A ... I …

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Hibernate error: ids for this class must be manually assigned before calling save():

Caused by: org.springframework.orm.hibernate3.HibernateSystemException: ids for this class must be manually assigned before calling save(): com.rfid.…

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How does jQuery work when there are multiple elements with the same ID value?

I fetch data from Google's AdWords website which has multiple elements with the same id. Could you please explain why …

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Are PostgreSQL column names case-sensitive?

I have a db table say, persons in Postgres handed down by another team that has a column name say, "…

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Using number as "index" (JSON)

Recently started digging in to JSON, and I'm currently trying to use a number as "identifier", which doesn't work out …

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Table name as a PostgreSQL function parameter

I want to pass a table name as a parameter in a Postgres function. I tried this code: CREATE OR …

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What characters are valid in an SQL Server database name?

We're going to provide our clients with a tool that (among other things) creates a new SQL Server database, and …

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