TheConnection general header controls whether the network connection stays open after the current transaction finishes. If the value sent is keep-alive, the connection is persistent and not closed, allowing for subsequent requests to the same server to be done.
Warning: Connection-specific header fields such as Connection and Keep-Alive are prohibited in HTTP/2 and HTTP/3. Chrome and Firefox ignore them in HTTP/2 responses, but Safari conforms to the HTTP/2 spec requirements and does not load any response that contains them.
All hop-by-hop headers used by the message - including standard hop-by-hop headers (Keep-Alive, Transfer-Encoding, TE, Connection, Trailer, Upgrade, Proxy-Authorization and Proxy-Authenticate) - must be listed in the Connection header, so that the first proxy knows it has to consume them and not forward them further.
The default value of Connection changed between HTTP/1.0 and HTTP/1.1. Therefore, to ensure backwards compatibility, browsers often send Connection: keep-alive explicitly despite that being the default in HTTP/1.1.
Indicates that the client would like to keep the connection open. Keeping a connection open is the default on HTTP/1.1 requests. The list of headers are the name of the header to be removed by the first non-transparent proxy or cache in-between: these headers define the connection between the emitter and the first entity, not the destination node.
\n The Connection general header controls whether the\n network connection stays open after the current transaction finishes. If the value sent\n is keep-alive, the connection is persistent and not closed, allowing for\n subsequent requests to the same server to be done.\n
\n Warning: Connection-specific header fields such as\n Connection and Keep-Alive are prohibited\n in HTTP/2 and\n HTTP/3. Chrome and\n Firefox ignore them in HTTP/2 responses, but Safari conforms to the HTTP/2\n spec requirements and does not load any response that contains them.\n
\n All hop-by-hop headers used by the message - including standard hop-by-hop headers (Keep-Alive,\n Transfer-Encoding, TE, Connection,\n Trailer, Upgrade,\n Proxy-Authorization and Proxy-Authenticate) - must be listed in the Connection\n header, so that the first proxy knows it has to consume them and not forward them\n further.\n
\n Indicates that the client would like to keep the connection open. Keeping a connection open\n is the default on HTTP/1.1 requests. The list of headers are the\n name of the header to be removed by the first non-transparent proxy or cache\n in-between: these headers define the connection between the emitter and the first\n entity, not the destination node.\n
The waiter appeared at our table again, this time offering a basket full of bread rolls just pulled from the oven. I picked out my third piece of the night, and carved out a heap of cultured butter, flecked with sea salt.
He conducted this research with his colleague Robert Levenson at the University of Washington. He brought couples into an observation facility, dubbed the Love Lab by the media, and recorded them discussing their relationship. He asked them to share the story of how they met and then to recount a recent fight. He even had some couples spend a week in an apartment decked out with cameras (with their permission) to see how they interacted during everyday moments.
Six years later, the researchers followed up with the couples and divided them into two camps: the masters, couples who were still happily married, and disasters, couples who had either broken up or remained together but were unhappy.
Gottman found a critical difference in how masters and disasters respond to bids for connection. In the Love Lab, masters turned towards each other 86% of the time. Disasters turned towards each other only 33% of the time.
Some people think they can put their relationship on ice and then thaw it out with the occasional romantic date night. But relationships are built and maintained with daily attention, not grand gestures.
In fact, happy couples bid all the time. Gottman found that at the dinner table, masters bid as many as one hundred times in a ten-minute period, while disasters engaged each other only sixty-five times.
When our partner denies our bids, we internalize the experience. Our brains subconsciously keep track of how many bids are accepted or rejected by our partners. When our partner constantly turns away or against our bids, we begin to feel frustrated. We are more inclined to criticize our partners, which pushes them to be defensive and may result in an argument.
A connection (session) with a specific database. SQL statements are executed and results are returned within the context of a connection. A Connection object's database is able to provide information describing its tables, its supported SQL grammar, its stored procedures, the capabilities of this connection, and so on. This information is obtained with the getMetaData method. Note: When configuring a Connection, JDBC applications should use the appropriate Connection method such as setAutoCommit or setTransactionIsolation. Applications should not invoke SQL commands directly to change the connection's configuration when there is a JDBC method available. By default a Connection object is in auto-commit mode, which means that it automatically commits changes after executing each statement. If auto-commit mode has been disabled, the method commit must be called explicitly in order to commit changes; otherwise, database changes will not be saved. A new Connection object created using the JDBC 2.1 core API has an initially empty type map associated with it. A user may enter a custom mapping for a UDT in this type map. When a UDT is retrieved from a data source with the method ResultSet.getObject, the getObject method will check the connection's type map to see if there is an entry for that UDT. If so, the getObject method will map the UDT to the class indicated. If there is no entry, the UDT will be mapped using the standard mapping. A user may create a new type map, which is a java.util.Map object, make an entry in it, and pass it to the java.sql methods that can perform custom mapping. In this case, the method will use the given type map instead of the one associated with the connection. For example, the following code fragment specifies that the SQL type ATHLETES will be mapped to the class Athletes in the Java programming language. The code fragment retrieves the type map for the Connection object con, inserts the entry into it, and then sets the type map with the new entry as the connection's type map. java.util.Map map = con.getTypeMap(); map.put("mySchemaName.ATHLETES", Class.forName("Athletes")); con.setTypeMap(map); See Also:DriverManager.getConnection(java.lang.String, java.util.Properties), Statement, ResultSet, DatabaseMetaDataField SummaryFields Modifier and TypeField and Descriptionstatic intTRANSACTION_NONEA constant indicating that transactions are not supported.static intTRANSACTION_READ_COMMITTEDA constant indicating that dirty reads are prevented; non-repeatable reads and phantom reads can occur.static intTRANSACTION_READ_UNCOMMITTEDA constant indicating that dirty reads, non-repeatable reads and phantom reads can occur.static intTRANSACTION_REPEATABLE_READA constant indicating that dirty reads and non-repeatable reads are prevented; phantom reads can occur.static intTRANSACTION_SERIALIZABLEA constant indicating that dirty reads, non-repeatable reads and phantom reads are prevented.Method SummaryAll Methods Instance Methods Abstract Methods Modifier and TypeMethod and Descriptionvoidabort(Executor executor)Terminates an open connection.voidclearWarnings()Clears all warnings reported for this Connection object.voidclose()Releases this Connection object's database and JDBC resources immediately instead of waiting for them to be automatically released.voidcommit()Makes all changes made since the previous commit/rollback permanent and releases any database locks currently held by this Connection object.ArraycreateArrayOf(String typeName, Object[] elements)Factory method for creating Array objects.BlobcreateBlob()Constructs an object that implements the Blob interface.ClobcreateClob()Constructs an object that implements the Clob interface.NClobcreateNClob()Constructs an object that implements the NClob interface.SQLXMLcreateSQLXML()Constructs an object that implements the SQLXML interface.StatementcreateStatement()Creates a Statement object for sending SQL statements to the database.StatementcreateStatement(int resultSetType, int resultSetConcurrency)Creates a Statement object that will generate ResultSet objects with the given type and concurrency.StatementcreateStatement(int resultSetType, int resultSetConcurrency, int resultSetHoldability)Creates a Statement object that will generate ResultSet objects with the given type, concurrency, and holdability.StructcreateStruct(String typeName, Object[] attributes)Factory method for creating Struct objects.booleangetAutoCommit()Retrieves the current auto-commit mode for this Connection object.StringgetCatalog()Retrieves this Connection object's current catalog name.PropertiesgetClientInfo()Returns a list containing the name and current value of each client info property supported by the driver.StringgetClientInfo(String name)Returns the value of the client info property specified by name.intgetHoldability()Retrieves the current holdability of ResultSet objects created using this Connection object.DatabaseMetaDatagetMetaData()Retrieves a DatabaseMetaData object that contains metadata about the database to which this Connection object represents a connection.intgetNetworkTimeout()Retrieves the number of milliseconds the driver will wait for a database request to complete.StringgetSchema()Retrieves this Connection object's current schema name.intgetTransactionIsolation()Retrieves this Connection object's current transaction isolation level.Map
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