A database connection is a facility in computer science that allows client software to talk to database server software, whether on the same machine or not. A connection is required to send commands and receive answers, usually in the form of a result set.
22-472: [REDACTED] Look up connection in Wiktionary, the free dictionary. [REDACTED] Wikiquote has quotations related to connection . Connection may refer to: Mathematics [ edit ] Connection (algebraic framework) Connection (mathematics) , a way of specifying a derivative of a geometrical object along a vector field on
44-415: A connection string , which is a way of addressing a specific database or server and instance as well as user authentication credentials (for example, Server= sql_box; Database= Common; User ID= uid; Pwd= password; ). Once a connection has been built it can be opened and closed at will, and properties (such as the command time-out length, or transaction , if one exists) can be set. The Connection String
66-454: A manifold Connection (affine bundle) Connection (composite bundle) Connection (fibred manifold) Connection (principal bundle) , gives the derivative of a section of a principal bundle Connection (vector bundle) , differentiates a section of a vector bundle along a vector field Cartan connection , achieved by identifying tangent spaces with the tangent space of a certain model Klein geometry Ehresmann connection , gives
88-403: A manner for differentiating sections of a general fibre bundle Electrical connection , allows the flow of electrons Galois connection , a type of correspondence between two partially ordered sets Affine connection , a geometric object on a smooth manifold which connects nearby tangent spaces Levi-Civita connection , used in differential geometry and general relativity; differentiates
110-573: A song by Avail from Satiate "Connection", a 1976 song by Can from Unlimited Edition "Connection", a song by the Kooks from 10 Tracks to Echo in the Dark (2022) Other uses [ edit ] Connection (film) , a 2017 Konkani film in Goa Connection (TV series) , a 2024 South Korean television series Connection (dance) , a means of communication between the lead and
132-406: A song by Avail from Satiate "Connection", a 1976 song by Can from Unlimited Edition "Connection", a song by the Kooks from 10 Tracks to Echo in the Dark (2022) Other uses [ edit ] Connection (film) , a 2017 Konkani film in Goa Connection (TV series) , a 2024 South Korean television series Connection (dance) , a means of communication between the lead and
154-459: A vector field along another vector field Music [ edit ] Connection (The Green Children album) , 2013 Connection (Don Ellis album) , 1972 Connection (Up10tion album) , 2021 Connection (EP) , a 2000 split EP by Home Grown and Limbeck Connection , a 2019 EP by Seyong "Connection" (Elastica song) (1994) "Connection" (OneRepublic song) (2018) "Connection" (Rolling Stones song) (1967) "Connection",
176-459: A vector field along another vector field Music [ edit ] Connection (The Green Children album) , 2013 Connection (Don Ellis album) , 1972 Connection (Up10tion album) , 2021 Connection (EP) , a 2000 split EP by Home Grown and Limbeck Connection , a 2019 EP by Seyong "Connection" (Elastica song) (1994) "Connection" (OneRepublic song) (2018) "Connection" (Rolling Stones song) (1967) "Connection",
198-450: A way of specifying a derivative of a geometrical object along a vector field on a manifold Connection (affine bundle) Connection (composite bundle) Connection (fibred manifold) Connection (principal bundle) , gives the derivative of a section of a principal bundle Connection (vector bundle) , differentiates a section of a vector bundle along a vector field Cartan connection , achieved by identifying tangent spaces with
220-425: Is composed of a set of key/value pairs as dictated by the data access interface and data provider being used. Many databases (such as PostgreSQL ) only allow one operation to be performed at a time on each connection. If a request for data (a SQL Select statement) is sent to the database and a result set is returned, the connection is open but not available for other operations until the client finishes consuming
242-453: Is different from Wikidata All article disambiguation pages All disambiguation pages connection [REDACTED] Look up connection in Wiktionary, the free dictionary. [REDACTED] Wikiquote has quotations related to connection . Connection may refer to: Mathematics [ edit ] Connection (algebraic framework) Connection (mathematics) ,
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#1732772409566264-486: Is different from Wikidata All article disambiguation pages All disambiguation pages Database connection Connections are a key concept in data-centric programming. Since some DBMS engines require considerable time to connect, connection pooling was invented to improve performance. No command can be performed against a database without an "open and available" connection to it. Connections are built by supplying an underlying driver or provider with
286-477: Is inefficient for an application to create, use, and close a database connection whenever it needs to update a database. Connection pooling is a technique designed to alleviate this problem. A pool of database connections can be created and then shared among the applications that need to access the database. The connection object obtained from the connection pool is often a wrapper around the actual database connection. The wrapper understands its relationship with
308-575: The complete path between two terminals The Connection (disambiguation) Virtual connection , also known as a virtual circuit Topics referred to by the same term [REDACTED] This disambiguation page lists articles associated with the title Connection . If an internal link led you here, you may wish to change the link to point directly to the intended article. Retrieved from " https://en.wikipedia.org/w/index.php?title=Connection&oldid=1249781056 " Category : Disambiguation pages Hidden categories: Short description
330-575: The complete path between two terminals The Connection (disambiguation) Virtual connection , also known as a virtual circuit Topics referred to by the same term [REDACTED] This disambiguation page lists articles associated with the title Connection . If an internal link led you here, you may wish to change the link to point directly to the intended article. Retrieved from " https://en.wikipedia.org/w/index.php?title=Connection&oldid=1249781056 " Category : Disambiguation pages Hidden categories: Short description
352-619: The follow Layover or connection, a transfer from one means of transport to another See also [ edit ] Connected sum Connectedness Connecting (TV series) Connections (disambiguation) Connexion (disambiguation) Contiguity (disambiguation) Database connection Disconnection (disambiguation) Link (disambiguation) PC Connection , a Fortune 1000, National Technology Solutions Provider, based in Merrimack, New Hampshire Rapport Six degrees of separation Telecommunication circuit ,
374-562: The follow Layover or connection, a transfer from one means of transport to another See also [ edit ] Connected sum Connectedness Connecting (TV series) Connections (disambiguation) Connexion (disambiguation) Contiguity (disambiguation) Database connection Disconnection (disambiguation) Link (disambiguation) PC Connection , a Fortune 1000, National Technology Solutions Provider, based in Merrimack, New Hampshire Rapport Six degrees of separation Telecommunication circuit ,
396-427: The methods on the wrapper object. This approach encourages the practice of opening a connection in an application only when needed, and closing it as soon as the work is done, rather than holding a connection open for the entire life of the application. In this manner, a relatively small number of connections can service a large number of requests. This is also called multiplexing . In a client/server architecture, on
418-421: The other hand, a persistent connection is typically used so that server state can be managed. This "state" includes server-side cursors, temporary products, connection-specific functional settings, and so on. An application failure occurs when the connection pool overflows. This can occur if all of the connections in the pool are in use when an application requests a connection. For example, the application may use
440-435: The pool, and hides the details of the pool from the application. For example, the wrapper object can implement a "close" method that can be called just like the "close" method on the database connection. Unlike the method on the database connection, the method on the wrapper may not actually close the database connection, but instead return it to the pool. The application need not be aware of the connection pooling when it calls
462-414: The result set. Other databases, like SQL Server 2005 (and later), do not impose this limitation. However, databases that provide multiple operations per connection usually incur far more overhead than those that permit only a single operation task at a time. Database connections are finite and expensive and can take a disproportionately long time to create relative to the operations performed on them. It
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#1732772409566484-488: The tangent space of a certain model Klein geometry Ehresmann connection , gives a manner for differentiating sections of a general fibre bundle Electrical connection , allows the flow of electrons Galois connection , a type of correspondence between two partially ordered sets Affine connection , a geometric object on a smooth manifold which connects nearby tangent spaces Levi-Civita connection , used in differential geometry and general relativity; differentiates
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