H2 console can be used to connect to other databases too. For instance, MySQL.
However, when connected to MySQL, it shows tables of all schema and not just the tables of connected schema.
What could be the issue?
Using Version 1.4.199 (http://repo2.maven.org/maven2/com/h2database/h2/1.4.199/h2-1.4.199.jar)
MySQL server is running
Start h2 with java -jar h2-1.4.199.jar
Select and open “Generic MySQL” and open “bankdb” schema (JDBC JAR is latest 8.0.16 and located in same folder)
Logging into MySQL with H2
On left side, shows tables of all schema, including tables of desired schema. (Expected: show tables of only "bankdb")
I have seen this behavior with other multi-database tools, such as HeidiSQL. There is nothing wrong with seeing other schemas per se, so long as you can connect to your desired database from within the tool. Are the only three tables in the bankdb database account, customer, and transaction? If so, then it means that you did connect to the correct database. You might also want to poke around and make certain that the USE <database> command works properly.
Related
I've some databases showing at MySql command line client as in the image below:
But in netbeans only the databases below are showing of the same localhost:3360 used by MySql command line client:
Why all of my databases are not showing in netbeans?
NetBeans uses the same show databases command to load the list of databases to the database explorer. You can see the source code for it here.
The show databases command only shows you those databases for which you have some kind of privilege.
You see only those databases for which you have some kind of
privilege, unless you have the global SHOW DATABASES privilege. You
can also get this list using the mysqlshow command.
So, ether NetBeans connects to a different MySQL server or you use a different user within the NetBeans connection.
First ever Stack Overflow post, thanks for your time. Any constructive criticism on how to post better, please just let me know. I have done a search on my query and have found similar posts, but I was unable to use the information within them to resolve my problem.
I have created a mysql database using the terminal window in my Ubuntu system (which I am also new to, having been a lifelong windows user). I used the following code in the terminal window:
$ mysql -u root -p
Then once in mysql, I did the following
CREATE DATABASE securities_master;
USE securities_master;
I created a user and tables in the database using some other code, that doesn't seem relevant here, so I won't bother posting. However, I then decided I would like to take a look at the tables in the database, so I downloaded an SQLite browser. It was at this point that I realized I could not find my database file.
I tried to find the answer on previous stack overflow posts, and tried the suggestions of:
locate sqlite
locate .db
locate .sqlite
locate securities_master
But unfortunately, none of these showed the file I was looking for. The only place I can think of would be what is called the 'root' directory in my computer, but the Ubuntu file manager system won't let me view it because it says I don't have permissions. Is this where it might be?
Could someone shed some light on where I might be able to find this file/database? I know it is definitely there because if I try to CREATE it again, I get the message that it can't because it already exists.
Thanks again.
sqlite and mysql are two different databases. You can't use sqlite on a mysql database. sqlite is a single-file database, in which users just open the file and read and write to it, while mysql is a more traditional relational database system with a server and a client, where the server manages the database (which is generally in a directory of files), while the client just connects to the server.
Where the mysql database is located my depend on your system, but it's usually in /var/lib/mysql. You can look in /etc/mysql/my.cnf for the configuration file, which should have a datadir option that refers to where the actual data for the database is stored.
You can check my.ini file to see where the data folder is located.
Usually there is a folder {mysqlDirectory}/data
MySQL data storage:
Commands.frm
Commands.myd
Commands.myi
The *.frm files contain the table definitions. Your *.myi files are MyISAM index files. Your *.myd files contain the table data.
as mentioned in the answer before mine, mysql and sqlite are two different systems.
You mention you used the cmd line mysql to create the database and then wanted to view the tables. If you're simply trying to see which table are created, in the same command line you used to Create the database you can run show tables;
If you're after a GUI for this, we'd need a bit more context. Is this ubuntu system a remote server, or are you using the desktop version?
You say you're a long time windows user, If you're using windows locally, I personally like SQLWorkbench for accessing my remote mysql servers.
EDIT: I just re-read your post and realised you're using local ubuntu desktop so me mentioning remote was silly, my bad! However, SQLWorkbench does have a ubuntu version at https://dev.mysql.com/downloads/workbench/
I have successfully migrated my mysql database file to an aws mysql instance using MySQL Workbench.
I now want to test that everything is migrated properly. When I connect to the db using MySQL Workbench and run an sql query such as
SELECT * FROM Users
I get an error saying that no database has been selected. I'm thinking that I'm actually only connected to the server and not the actual database. Is there a method to connect to the actual db and view all the tables on the server using MySQL Workbench or possibly another tool.
You never connect to a database. A database (aka schema) is just an organizational construct within a database server (aka RDBMS). So, first you connect to that server, to establish the communication. Then you select a schema to work with. Either run a USE command or, in MySQL Workbench, double click on a schema node in the schema tree on the left hand side to make this the current default. You can also set an initial default schema in the connection settings. The current (default) schema is shown in bold in the tree:
Figured it out.
There is a small expand button in the navigator panel on the left which can be expanded and I can view all my tables, columns etc...
I have recently started using MySQL Workbench, hence I apologise if this is not the proper platform to ask this question. I tried to figure out the solution of my own, but could not find any appropriate one.
Here is my situation: At my workplace, we have a huge set of data about the operational and financial figures such as sales, employee, profit, etc for European companies spread over past 7-8 years and new data keeps coming regularly. However, the problem is we work from different remote locations, me in one city and the other two colleagues in a different city. Normally, we share our work files (.xls/.doc) etc through Dropbox. So, we thought of creating a database in MySQL wherein we all can submit/edit/add this data so that we can filter and analyse this data on several ways once the collection is complete. And we plan to use and access it thereafter. We believe that this is ease a lot of our work. So all I want to know is: can all three of us collaborate simultaeousy (in order to add or edit the data) through workbench Server administration, like the way we collaborate our work through Dropbox? I want to be the host (like the administrator) and then want to allow the access to my colleagues.
Thank you for your time and answer. You may also refer me to any site or link to read more about it.
I think you are a bit confused about what MySQL Workbench is.
MySQL workbench is just a data viewer and administration tool that connects to a MySQL server, there's no data "stored" in MySQL workbench, all the data is stored in the server.
MySQL workbench can:
Connect to a MySQL server
Send SQL instructions and show the results: You can create and drop databases, send SQL queries, create and execute stored procedures and functions... all assuming you have the right privileges.
Perform administration tasks: You can create and drop users, grant or revoke permissions, etcétera
But the fact is: all is stored in a MySQL server... so the answer to your question is: Yes, you can work simmultaneously with your colleagues, if and only if all of you can connect to the same database server (as Mike W commented).
Addressing your comments, and clarifying more details:
MySQL is a database server. When you install it in a computer, all data is stored in that computer (aside from replication and other fine details). You should make regular backups of your data (MySQL has tools for that, one is mysqldump). If you want to access the data stored in your database server, you can do it:
By ussing the command-line client,
By using MySQL workbench or another GUI client program, or
By any program that can connect to the database server (via ODBC or specific libraries).
Focusing on MySQL Workbench, and addressing your specific question: If your machine breaks down, you can install the MySQL Server in any other machine, and load the backup into it. You will have to configure that new machine so that any of your coworkers can connect to it (that may imply that a new set of connection parameters is created).
I've installed a new TeamCity instance and just moved from internal storage to database (SQL Server). Followed the instructions at http://confluence.jetbrains.com/display/TCD7/Setting+up+an+External+Database and I know I've done the database part correctly as it wouldn't initially connect and I had to go back and turn on TCP/IP connections for SQL Server.
From the documentation I assumed that team city would create and maintain it's own database schema, but even though it's user is dbo the database remains blank - no tables, views or any other objects have been created.
When I try to connect to it in a browser I get "Database is empty or doesn't exist", and viewing the logs shows me "Schema contains no tables". I've obviously restarted the service and connected again each time.
Is there an install script I am missing? How do I get TeamCity to install it's schema?
When you are doing it like this, you will need to migrate the initial structure over to sql server. See here