merge multiple databases into one

Tags: setting blog class Mon settings Ali imp must have aUse the Mongoengine module when using the MongoDB database in Djnago. In Settings, configure the database connection as follows: from Import connectconnect ('dbname1', host='127.0.0.1', port= 27017)The dbname1 is the name of the MongoDB database to be connected, and the host Ip,port the MongoDB database as the corresponding port.The above is the configuration of a single database, if you want to configure

Label:Background: In the process of using mybatis, considering the integration framework in the late use of the process, it may be necessary to be compatible with a variety of databases, under this precondition, the completion of the general crud function of the writing, this paper first consider the different database for paging function unified operation For example, the paging of MySQL database is the use of the Limit keyword, and the paging of Ora

Previously, there were several ways to connect multiple databases in a rails application, as follows:class Cookies activerecord::base establish_connection:typoThis way, when using operations such as Cookie.find, you will be connected to operations on the Monitor_spider configured database in DATABASE.YML. I used to use it all the time and found nothing wrong. Most recent project, because of the proce

Label:Phalcon you need to configure multiple connections when connecting to multiple databases ' Tutorial ' = [ //' adapter ' = ' mysql ', ' host ' = ' 127.0.0.1 ', ' Port ' ' = ' = ' 3306 ', ' username ' + ' root ', ' password ' + ' , ' dbname ' and ' tutorial ' ], c11/> ' invo ' + [ //' adapter ' = '

JBoss is a very powerful Java EE application Server, but this powerful feature also brings complexity. The author of this article, Marcus Zarra, analyzes how to configure multiple databases and data sources in JBoss. Configure a data source The default setup process for JBoss is a total of three configuration options: all, default, and minimum (minimal). If you start the JBoss server for the first time wi

providername!　　"); return; } using (conn) //polymorphism, no one knows whether Conn is SQL or access { if (conn). state = = connectionstate.closed) { Conn. Open (); } using (IDbCommand cmd = conn. CreateCommand ()) { cmd. CommandText = "Insert into T_person (name,age) Values ('" + txtName.Text + "'," + Convert.ToInt32 (txtage.text) + ")"; if (Convert.ToInt32 (cmd). ExecuteNonQuery ()) > 0) { MessageBox.Show ("added s

databases.py app.config[' sqlalchemy_database_uri '] = globalsset[' Dblink '] #默认数据库链接 app.config[' Sqlalchemy_bin DS '] = {' One ': globalsset[' dblink_one '], ' both ': globalsset[' dblink_two ']}models.py__tablena me__ = ' tname ' __bind_key__ = ' one 'Problem:To reuse group BY, you cannot use the distinct notation "db_session.query (table name. IP). Distinct ()" because a multi-data source is used, db_session.query (table name) can only write table names because models in __ Bind_key__ contr

Label:1, installed in Windows first download Cygwin, in accordance with the book operation can be. For net.c files, refer to http://my.oschina.net/maxid/blog/186506 for modification. can then start normally. 2. Command line (1) Send command: After Redis-server.exe is turned on, the command line operation is performed directly in Redis-cli.exe. (2) Command return value: ①: Status Reply 127 ... (after omission of writing) >ping Pong②: Error reply 127...>errorcommand (errors) ERR unknown command '