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.
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 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 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 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.
Error establishing a database connection how to Fix this po?
panu po yan? di kasi makabasa ng mga Novel sa sonicmtl , at di rin maka access sa mangafreak ,salamat po sa sasagot
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SHIPMENT (I just copy the formula of Purchase Order, I just need a new database to store the Shipment but it always saving in the Purchase Order while I'm in Shipment)
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Pano gawin yung winforms na nakaconnect sa data base mga master?
Ayaw kasi magrun . Win11 laptop ko. Ayoko kasi magdowngrade .
hp 8gb ram 64bit win11
Eto device kong gamit