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A session keeps track of ORM objects and their changes, manages transactions and is used to perform queries.

Backing up the filesystem instead of using pg_dumpall and pg_dump It's very important that if you use this, you call the pg_start_backup() function before and pg_stop_backup() function after. Doing filesystem backups is not safe otherwise; even a ZFS or FreeBSD snapshot of the filesystem backed u...

From a storage perspective, an XML document is made of entities. One of the entities is the document entity, which is the main XML document itself. Entities can be classified like so (tentatively sorted by descending order of usage): document entity: this is the main XML file. internal genera...

XPath 1.0 doesn't have the concept of a default namespace. Also, the namespace prefixes defined in the original XML document do not affect XPath - namespace prefixes have to be explicitly registered with the XPath provider, otherwise prefixes can't be used at all in the XPath expression.

Vue.directive(id, definition); Vue.directive(id, update); //when you need only the update function. ParameterDetailsidString - The directive id that will be used without the v- prefix. (Add the v- prefix when using it)definitionObject - A definition object can provide several hook function...

Error Log Locations /var/log/ Typically the system.log and exception.log file will exist in the /var/log/ folder. These contain most of the information you will need. You can check to see if these are enabled and what the names of the exception and system log are by going to System > Conf...

Data vs Computed Properties The main use-case difference for the data and computed properties of a Vue instance is dependent on the potential state or probability of changing of the data. When deciding what category a certain object should be, these questions might help: Is this a constant ...

fetch(url, options)[.then(...)[.catch(...)]] The Fetch API is the most commonly used API for HTTP requests. It is modern, flexible and it uses promises. The XMLHttpRequest API is also used for HTTP requests and is mainly included so that developers may use their favorite existing librar...

This section provides an overview of what data-structures is, and why a developer might want to use it. It should also mention any large subjects within data-structures, and link out to the related topics. Since the Documentation for data-structures is new, you may need to create initial version...

Using undocumented features is considered a risky practice1, as these features may change without notice or simply work differently on different MATLAB versions. For this reason, it is advised to employ defensive programming techniques such as enclosing undocumented pieces of code within try/cat...

heroku pipelines:<install|create|promote>... A pipeline is a group of Heroku apps that share the same codebase. Apps in a pipeline are grouped into “review”, “development”, “staging”, and “production” stages representing different deployment steps in a continuous delivery workflow. ...