Difference between revisions of "Database Server"

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This step by step tutorial shows you how to run BaseX in client-server mode from a terminal.  You can copy & paste the commands to get it running on your machine. After you finished this tutorial, you will be familiar with the basic administration of BaseX. Visit the [[Commands|commands section]] for a complete list of database commands.
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This article belongs to the [[Getting Started]] Guide. It tells you how to run BaseX in client-server mode from command-line.
  
==Startup==
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=Startup=
  
see the [[Startup Overview]].
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==Server==
  
==First Operations==
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{{Announce|With Version 10, the default admin password has been removed.}}
To get familiar with BaseX we suggest to execute the following basic operations.
 
  
===Create a database===
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The database server handles concurrent [[Transaction_Management|read and write transactions]], [[User Management|manages user permissions]] and [[Logging|logs user interactions]]. It can be started as follows:
* To create a database you need an XML document, e.g. [http://www.w3.org/XML/Binary/2005/03/test-data/Over100/factbook.xml factbook.xml].
 
* Save this document to the /basex directory.
 
* On the client terminal run:
 
<code>
 
: > create db factbook factbook.xml
 
</code>
 
  
: ''factbook'' - is the name of the database <br/>
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* Run one of the {{Code|basexserver}} or {{Code|basexserver.bat}} scripts. Use {{Code|basexserverstop}} or {{Code|basexserverstop.bat}} to gracefully shut down the server.
: ''factbook.xml'' - is the xml file, which is used to create the database<br/>     
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* If you have installed BaseX on ''Windows'', click on the '''BaseX HTTP Server (Start)''' icon, which will start both the HTTP Server used for [[#Web Application|Web Applications]] and the database server. With '''BaseX HTTP Server (Stop)''', you can shut down the server process.
  
If everything works you see the following lines:
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Unless you have already chosen an admin password yet (e.g., via the Windows installer or a previous installation), you can do so by invoking the {{Command|PASSWORD}} command on your terminal:
<pre>Database 'factbook' created in 1950.83 ms.
 
</pre>
 
 
; Where is the database stored?
 
Databases are stored in the BaseXData directory which is located in your home folder. Depending on your operating system the location of your home folder varies. For example, on a mac it's /Users/John, if your name is John.
 
 
 
===Execute a query===
 
The [[Commands|xquery]] command lets you run a query.
 
* For example, this query returns all country nodes in the currently opened database.
 
<code>
 
: > xquery //country
 
</code>
 
 
 
* You can also run queries in files:
 
<code>
 
: > run /Users/John/query.xq
 
</code>
 
 
 
===Create a new database===
 
Now we will create another database. You can find the example document here: [http://phobos101.inf.uni-konstanz.de/basex/demo].
 
 
 
* Create the new database, named 'xmark'.
 
<code>
 
: > create db xmark xmark.xml
 
</code>
 
 
 
* Set the new database xmark as the context:
 
<code>
 
: > open xmark
 
</code>
 
 
 
* Now you can easily execute queries on your new database:
 
<code>
 
: > xquery //people/person/name
 
</code>
 
 
 
===Switch the database===
 
* You can explicitly query the factbook database with the doc()-funtion, no matter what the current context is.
 
<code>
 
: > xquery doc("factbook")//country
 
</code>
 
 
 
* Otherwise, to set factbook as the current context, execute the following:
 
<code>
 
: > open factbook
 
</code>
 
 
 
* To list the current context, type:
 
<code>
 
: > show databases
 
</code>
 
 
 
That yields the following lines:
 
  
 
<pre>
 
<pre>
1 opened database(s):
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basexserver -c PASSWORD
- factbook (1x)
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BaseX [Server]
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Server was started (port: 1984).
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Password: _
 
</pre>
 
</pre>
  
===Close or delete a database===
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By default, the server listens to the port {{Code|1984}}. Pressing {{Code|Ctrl+c}} will close all connections and databases and gracefully shut down the server process.
* To [[Commands|close]] the current context database type:
 
<code>
 
: > close
 
</code>
 
  
* Use the [[Commands|drop]] command to delete the xmark database:
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Various [[Command-Line_Options#Server|command-line options]] are available to simplify batch processing. The [[Start_Scripts|start script]] can be adjusted for individual purposes (e.g. if the default memory limit is too restrictive).
<code>
 
: > drop db xmark
 
</code>
 
  
===Create a collection===
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==Client==
'''What is a collection?'''
 
With BaseX you can group documents into one logical collection. A collection is a database that contains two or more documents. Collections accept any type of XML documents, regardless of their structure.
 
  
Let's add the xmark.xml document to the factbook database to create a collection. The name of the original factbook database remains.
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Database clients are started similarly:
  
* First make sure factbook is opened:
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* Run one of the {{Code|basexclient}} or {{Code|basexclient.bat}} scripts.
<code>
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* Execute the following command: {{Code|java -cp BaseX.jar org.basex.BaseXClient}}
: > open factbook
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* If you have installed BaseX on ''Windows'', click on the '''BaseX Client''' icon.
</code>
 
  
* Now add the xmark.xml document:
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At startup, you need to enter your credentials.
<code>
 
: > add xmark.xml
 
</code>
 
  
===Delete a document from a collection===
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For further details, have a look at the [[Command-Line_Options#Client|command-line options]] and the [[Start_Scripts|start script]].
* Deleting a document from a collection is very easy:
 
<code>
 
: > delete xmark.xml
 
</code>
 
  
Make sure the collection which contains the xmark.xml document is opened.
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=Introduction=
  
===Delete a collection===
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The BaseX command-line client provides similar features to the [[Command-Line Client|standalone client]]. The major difference is that all commands will be executed by the BaseX server instance. As a consequence, paths/URIs to resources need to be resolvable by the server (file contents will not be transfered to the server).
Deleting a collection is the same as deleting a database.
 
  
* To delete the collection factbook, type:
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Username and password can also be specified as command-line option. To evaluate commands without entering the console mode, you can use the <code>-c</code> option on the command line:
<code>
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: > drop factbook
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<pre>
</code>
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basexclient -V -Uadmin -P... -c "CREATE DB input <example/>; XQUERY /"
  
===Get information about the server===
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Database 'input' created in 13.85 ms.
Several commands help to explore the state of a server. For a complete list visit the [[Commands|commands section]].
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<example/>
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Query:
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/
  
* To see all databases on the server, type:
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Parsing: 0.18 ms
<code>
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Compiling: 0.04 ms
: > list
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Evaluating: 0.12 ms
</code>
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Printing: 0.07 ms
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Total Time: 0.41 ms
  
* To see which database is currently opened:
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Hit(s): 1 Item
<code>
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Updated: 0 Items
: > show databases
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Printed: 10 Bytes
</code>
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Read Locking: local [input]
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Write Locking: none
  
* To see the general information of the opened database, type:
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Query "user" executed in 0.41 ms.
<code>
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</pre>
: > info
 
</code>
 
 
 
* To see the users in BaseX, type:
 
<code>
 
: > show users
 
</code>
 
 
 
===Backup and Restore===
 
To backup your database, type:
 
:<code>
 
> backup factbook
 
</code>
 
  
To restore your database, type:
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=Language Bindings=
:<code>
 
> restore factbook
 
</code>
 
  
'''Where is the backup-file stored?'''
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If you want to communicate with the database server programmatically, we provide clients for various [[Clients|programming languages]].
  
The backup-file is stored in the database directory.
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=Changelog=
The file is named <code>factbook-timestamp.zip</code> (<code>db_name-timestamp.zip</code>).
 
To restore the database the file with the newest timestamp is taken.
 
  
==See also ==
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;Version 10.0
[[Standalone Tutorial]], [[GUI Tutorial]], [[Getting Started]], [[Advanced User Portal]]
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* Updated: The default admin password has been removed.
[[Category:Beginner]]
 
[[Category:Server]]
 

Revision as of 14:00, 25 July 2022

This article belongs to the Getting Started Guide. It tells you how to run BaseX in client-server mode from command-line.

Startup

Server

With Version 10, the default admin password has been removed.

The database server handles concurrent read and write transactions, manages user permissions and logs user interactions. It can be started as follows:

  • Run one of the basexserver or basexserver.bat scripts. Use basexserverstop or basexserverstop.bat to gracefully shut down the server.
  • If you have installed BaseX on Windows, click on the BaseX HTTP Server (Start) icon, which will start both the HTTP Server used for Web Applications and the database server. With BaseX HTTP Server (Stop), you can shut down the server process.

Unless you have already chosen an admin password yet (e.g., via the Windows installer or a previous installation), you can do so by invoking the PASSWORD command on your terminal:

basexserver -c PASSWORD
BaseX [Server]
Server was started (port: 1984).
Password: _

By default, the server listens to the port 1984. Pressing Ctrl+c will close all connections and databases and gracefully shut down the server process.

Various command-line options are available to simplify batch processing. The start script can be adjusted for individual purposes (e.g. if the default memory limit is too restrictive).

Client

Database clients are started similarly:

  • Run one of the basexclient or basexclient.bat scripts.
  • Execute the following command: java -cp BaseX.jar org.basex.BaseXClient
  • If you have installed BaseX on Windows, click on the BaseX Client icon.

At startup, you need to enter your credentials.

For further details, have a look at the command-line options and the start script.

Introduction

The BaseX command-line client provides similar features to the standalone client. The major difference is that all commands will be executed by the BaseX server instance. As a consequence, paths/URIs to resources need to be resolvable by the server (file contents will not be transfered to the server).

Username and password can also be specified as command-line option. To evaluate commands without entering the console mode, you can use the -c option on the command line:

basexclient -V -Uadmin -P... -c "CREATE DB input <example/>; XQUERY /"

Database 'input' created in 13.85 ms.
<example/>
Query:
/

Parsing: 0.18 ms
Compiling: 0.04 ms
Evaluating: 0.12 ms
Printing: 0.07 ms
Total Time: 0.41 ms

Hit(s): 1 Item
Updated: 0 Items
Printed: 10 Bytes
Read Locking: local [input]
Write Locking: none

Query "user" executed in 0.41 ms.

Language Bindings

If you want to communicate with the database server programmatically, we provide clients for various programming languages.

Changelog

Version 10.0
  • Updated: The default admin password has been removed.