I would like to develop a ER diagram using DBeaver (Eclipse plugin) for a database that doesn't yet exist. Also, the database server doesn't exist.
Can DBeaver be used to develop a ER diagram without connecting to an existing database server? I can only find documentation for working with an existing database or connecting to an existing database server.
Nope, sorry.
DBeaver tools are always associated with the current connection.
For example, in the ERD when adding tables, DBeaver often sends requests to the database of foreign keys.
You can use standard sample SQLite database in DBeaver for experiments.
Related
I’m trying to perform a Diff on two DB2 schema’s and when I try to select my source and destination connections it doesn’t list my NEW connection. I’m using latest version. I can connect to DB2 manually and query as well, but just can’t sect that connection during database Diff.
Where are the connections saved in sql
Developer?
That feature is reserved for Oracle Database connections.
DB2 connectivity is provided for migrations to Oracle only.
We have limited support for DB2 in the Data Modeler (which is part of SQL Developer), and you can compare models, but the generation of DDL synch scripts is reserved for Oracle data models only.
Can someone tell me the difference between pgAdmin and postgreSQL? Are both of them one in the same? I can't draw a ER diagram in pgAdmin but was wondering if it's possible in postgreSQL?
Once I downloaded the postgreSQL it automatically downloaded the pgAdmin and the postgreSQL database is not in sight.
The PostgreSQL is a database engine implementing SQL standards. It usually listen as a server on a network tcp port to provide its abilities.
The pgAdmin is a sort of client. You are able to manipulate schema and data on an instance or multiple instances of PostgreSQL engines.
The MS Windows instalation package consists of both PostgreSQL server and PgAdmin client. So far right after the instalation you are able to manage your databases.
PostgreSQL (pronounced as post-gress-Q-L) is an open source relational
database management system ( DBMS ) developed by a worldwide team of
volunteers. PostgreSQL is not controlled by any corporation or other
private entity and the source code is available free of charge.
The pgAdmin package is a free and open source graphical user interface
administration tool for PostgreSQL, which is supported on many
computer platforms.
phpPgAdmin is a web-based administration tool for PostgreSQL written in PHP and based on the popular phpMyAdmin interface
originally written for MySQL administration
Hope you can understand now it well!!
I know that SQL Server has linked server that allow it to connect to other database and execute query. Now I am using firebird. I wonder if firebird has its "linked server" to access other databases. Thanks!
Firebird doesn't have a linked server feature. There is a limited method for accessing other Firebird databases (either remote or locally) using EXECUTE STATEMENT, however this only supports Firebird database, and you need to provide the data source information on each invocation.
I have the following code to generate the schema for a database in Nhibernate
new SchemaExport(configuration).Execute(true, true, false);
but when run against a PostgreSQL database, I end up getting the following error
[NpgsqlException (0x80004005): FATAL: 3D000: database "dbname" does not exist]
If I however create the database manually, the schema is exported without errors. An so the question: Why is Nhibernate SchemaExport unable to create a PostgreSQL database and yet this works against other databases like SQLite, MsSqlCe and MsSql Server.
I have searched for online literature but have been unable to locate any highlighting on this issue.
I am using Nhibernate 3.3.1 with PostgreSQL 9.2.
You must create the database before you can create the tables and other objects within the database.
Do this with a CREATE DATABASE statement on a PostgreSQL connection - either in your app, or via psql or PgAdmin-III.
PostgreSQL doesn't support creating databases on demand / first access. Perhaps that's what your tool is expecting?
If you think the DB does exist and you can see it in other tools, maybe you're not connecting to the same database server? Check the server address and port.
Suppose I have multiple Oracle databases in the same server. Now I want to connect to particular database and query a table just like SQL Server 2008. How to start particular Oracle database?
If you are using SQL*Plus, the most common syntax for opening a connection is
sqlplus user_name/password#tns_alias
In this example TNS_ALIAS is the TNS alias for the particular database you want to connect to (most likely "XE" based on your followups to inium's answer). If you want to connect to a different database, you would need to specify a TNS alias for that specific database.
Note that since you are coming from a SQL Server background, the SQL Server definition of a database is rather different than the Oracle definition. What SQL Server calls a database is similar logically to what Oracle calls a schema (and similar physically to what Oracle calls a tablespace). So when you're dealing with Oracle, it's much more common to have many schemas in a single database than to have a large number of databases on a server. This is particularly true if you're using the Express Edition (Oracle XE) where you're generally limited to one database per machine.
go to cmd and type sqlplus <database-name>/<database-password>
You can use SQL Developer, it's similar to SQL Enterprise Manager 2005. Just create a new connection using the db user name and password.