federated authentication

Brief introduction It is not uncommon for entity Enterprise javabeans™ (EJB) developers to find themselves facing the challenge of data modeling issues. Because entity EJBS typically represent data managed by relational DBMS, programmers often have to decide how to map existing data in a table to a new server-side Java™ object that is required to support WEB applications. Although many development tools can help programmers build a single entity EJB mapped to a single table, but it's hard to fi

Label:Hello, everyone, today I met a federated query of two tables between two databases in DB2 I know there are dblink in Oracle, but I don't know what to do with the two database federated queries of DB2.I looked for something similar toFor example, two databases: DB1,DB2User namePasswordSELECT * from DB1. User name. password, DB2. Username. password where db1. Nm=db2. NMBut it's not good to use.Thank you

Label:We all know that when you need more than 2 columns in a table to determine the uniqueness of a record, you need to use the federated primary key, and when the Federated primary Key is established, the performance will be greatly improved when querying the data, but it is not a single query for any column of the Federated primary Key. But we can still improv

In the database system, the Union table (chain table) is an interesting application and provides a simple method.To share the data of the remote database, but it does not need to be as complex and troublesome as configuring the cluster or copying. If your databaseIf you do not have high performance requirements or need to temporarily share a remote data, consider usingMySQL Federated engine.The Federated ta

1. Mapping rules for federated primary keys1) Each primary key attribute in the class corresponds to each primary key column in the data table.Hibernate requires an entity class with a federated primary key to implement the serializable interface, and overrides the hashcode with the Equals method, because hibernate determines whether a two-row record is the same based on the

SQL Server databases have been used in the past. Recently, the company has a new project to use mysql databases, many of which are cross-server access. SQL server uses the linked server I used SQL Server databases all the time. Recently, the company has a new project to use mysql databases, many of which are cross-Server access. SQL Server uses the linked Server I used SQL Server databases all the time. Recently, my company has a new project to use mysql databases, many of which are cross-S

I used SQL Server databases all the time. Recently, my company has a new project to use mysql databases, many of which are cross-Server access. SQL Server uses linked servers for cross-Server access, while mysql is implemented through the Federated engine. To configure the Federated engine, MySQL or later is required. The specific configuration method is as follows: 1. Check whether the

Tags: name of the top HTTP table generally authorized and so on principleI have a table students table, there are 3 fields, id,name,age I want to query through name and age, in which two fields are created federated index? Or do you create a single-column index on nage and age, respectively? Multiple field queries when do I use a federated index to create a single-column index separately? Fan XiaopengLinks:

Using the mysql federated engine to build the MySQL distributed database access layer the federated described in this article is a special MySQL engine that can be used to map local data tables to remote MySQL Data Tables, the topology is shown below:In this way, a unified data access portal can be constructed, which greatly improves the maintainability of the entire database system. The

As the application complexity increases, database segmentation is constantly refined, resulting in complicated and messy database applications in applications. Most programmers may encounter this situation, and the application needs to connect to multiple database servers for corresponding operations. Over time, the connection logic of too many database servers appears in the program, which brings a great deal of work to the maintenance and expansion of the program. As a result, some Distributed

1. Mapping rules for federated primary keys1) Each primary key attribute in the class corresponds to each primary key column in the data table.Hibernate requires an entity class with a federated primary key to implement the serializable interface, and overrides the hashcode with the Equals method, because hibernate determines whether a two-row record is the same based on the

Tags: style color Java Data Management database JS differentThere is a requirement in the project to publish an activity, record the ID and participant ID of participating in the activity, call the interface, add a record to the collection, and add a record to the transaction table. Finally, according to the results of the return, give different information.1. If you are currently working on a JSP page, decide if you have participated. After you have participated, the join button is not a point.

A federated primary key is a primary key that consists of 2 or more 2 fields. This combination is unique in the data table and has a primary key index, using the field contained in the primary key as the primary key.It can be understood that, for example, your order table has a lot of fields, the general situation as long as there is an order number bill_no the master key can be, but now the requirements may be a complementFilling orders, using the sa

This article summarizes several conditions in which a query statement triggers a federated index (at least two indexed columns in an index definition). examples are shown below. First create the table:CREATE TABLE E (E1 int, E2 VARCHAR (9), E3 int, PRIMARY KEY (E1, E3));This establishes a federated index: E1,e3triggering a federated index is conditional:1. Use al

Tags: mysql federated dblinkAs the complexity of the business continues to increase, the database is constantly segmented, in the distributed system often one or several databases do not meet our needs, so often need more than one at a time, and in peacetime need to use other servers in the database to obtain information is the most convenient data link, The more common Dblink in Oracle, the ones that use Oracle's dblink-database, know that data can b

Label:Federated Storage Engine DescriptionThe federated storage Engine allows you to access a remote MySQL database without using replication or cluster technology (similar to Oracle's Dblink), using the Federated Storage Engine's table, locally storing only the table's structure information, The data is stored on the remote database, and the data retrieved from the remote library is returned locally at que

single SQL API to access different distributed data WebSphere Information Integrator builds the database federation in the context of the DB2 UDB database engine by storing metadata for federated data sources in its own catalogs. Since every data source in the federation has been operating autonomously, maintaining consistency between the federated database and the source of its federation is a considerab

Tags: database DB2If you need to use all of the different databases, including SELECT, INSERT, update, and delete, as if all the tables are in a single database, then you will get very high productivity. Database Federation is going to do this: make all tables look like they are in the same databaseSo, how does the database federation work?The Federated (federator)system operates on a table in the remote system " being

Mysql uses the federated engine for remote database access (cross-network operation of tables in two databases at the same time)Problem: Assume that I need to access table 2 in the database of IP2 on database1 on IP1.Method: Here, as a local database, you must enable the federated engine to access the tables in the remote database. The specific enabling method is as follows:Enable