You may need to reconfigure or disable it. Check the driver version is compatible with the database software. Please inform us in this case. Further connectivity tips can be found on the H2 Connectivity Tips page. Get our latest news by subscribing to our newsletter. Theory : Execute a script that creates and populates the database when the application starts.
This should be done only once, on the first execution. Further executions should use the existing database and data. How To : use flyway or another tool to executes the script automatically calling a simple method.
Stack Overflow for Teams — Collaborate and share knowledge with a private group. Create a free Team What is Teams? Collectives on Stack Overflow. Learn more. Ask Question. Asked 4 years, 11 months ago. Active 4 years, 11 months ago.
Viewed times. In order to keep your connection parameters hidden from plain sight, you can use Docker Secrets to put all parameters in files so Docker can read and load them in memory before the container is started.
This is an example of a docker-compose. Hi Tananaev, hope you are doing well, i'd like to migrate my H2 database to Mysql, i'm awre of the procedure to follow but my current database contains multiple devices i production, so I wanted to know if I'm doing the migration, will I find all the devices already configured?
Or I need to convert the database H2 to mysql to avoid a golive? Looking forward to your reply. Here is the procedure for Windows to convert a H2 database: Go to 'drivers list', where everything is red by default. Select 'H2' driver, and specify the full path to 'h This ensures no accidental data gets written to the db while migrating. Make a backup copy of your H2 application database by following the instructions in Backing up Metabase Application Data.
Safety first! Run the Metabase data migration command using the appropriate environment variables for the target database you want to migrate to. To create the smaller jar file, run the command.
The database files needs to be stored in a place that is accessible for the application. Limitations: Using a connection pool is currently not supported, because the required javax.
Instead, import the data first possibly into a temporary table , create the required indexes if necessary, and then query this table. A fast way to load or import data sometimes called 'bulk load' from a CSV file is to combine table creation with import.
Optionally, the column names and data types can be set when creating the table. The Csv tool can be used in a Java application even when not using a database at all.
The recommended way to upgrade from one version of the database engine to the next version is to create a backup of the database in the form of a SQL script using the old engine, and then execute the SQL script using the new engine. The recommended way to backup a database is to create a compressed SQL script file. This will result in a small, human readable, and database version independent backup. Creating the script will also verify the checksums of the database file. The Script tool is ran as follows:.
The backup can be done remotely, however the file will be created on the server side. The built in FTP server could be used to retrieve the file from the server. The restore can be done remotely, however the file needs to be on the server side.
The built in FTP server could be used to copy the file to the server. However, when using the server mode, the references script files need to be available on the server side. However, the contents of this file are not human readable. The resulting backup is transactionally consistent, meaning the consistency and atomicity rules apply.
The Backup tool org. Backup can not be used to create a online backup; the database must not be in use while running this program. Creating a backup by copying the database files while the database is running is not supported, except if the file systems support creating snapshots. With other file systems, it can't be guaranteed that the data is copied in the right order. This database comes with a number of command line tools. To get more information about a tool, start it with the parameter '-?
The tools can also be called from an application by calling the main or another public method. For details, see the Javadoc documentation. The connection setting can also be set as command line parameters.
After connecting, you will get the list of options. The built-in commands don't need to end with a semicolon, but SQL statements are only executed if the line ends with a semicolon ;. This allows to enter multi-line statements:.
By default, results are printed as a table. For results with many column, consider using the list mode:. The steps to connect to a H2 database are:. This can be done by create it using the NetBeans OpenOffice plugin. See also Extensions Development. Otherwise, when trying to write to the file system, the following exception will occur: java.
AccessControlException : access denied java. Example permission tags:. For H2, opening a connection is fast if the database is already open. Still, using a connection pool improves performance if you open and close connections a lot. A simple connection pool is included in H2. For H2, it is about twice as faster to get a connection from the built-in connection pool than to get one using DriverManager.
The build-in connection pool is used as follows:. H2 includes two fulltext search implementations. One is using Apache Lucene, and the other the native implementation stores the index data in special tables in the database. You need to initialize it in each database where you want to use it. Afterwards, you can create a fulltext index for a table using:.
The list of column names comma separated is optional, in this case all columns are indexed. The index is updated in realtime. To search the index, use the following query:. To use the Apache Lucene full text search, you need the Lucene library in the classpath. Apache Lucene 5. Newer versions may also work, but were not tested. To initialize the Lucene fulltext search in a database, call:.
Afterwards, you can create a full text index for a table using:. To drop an index on a table be warned that this will re-index all of the full-text indices for the entire database :. The Lucene fulltext search supports searching in specific column only. Column names must be uppercase except if the original columns are double quoted. This database supports user-defined variables. Variables start with and can be used wherever expressions or parameters are allowed.
Variables are not persisted and session scoped, that means only visible from within the session in which they are defined. A value is usually assigned using the SET command:. Variables that are not set evaluate to NULL. The data type of a user-defined variable is the data type of the value assigned to it, that means it is not necessary or possible to declare variable names before using them. There are no restrictions on the assigned values; large objects LOBs are supported as well.
Rolling back a transaction does not affect the value of a user-defined variable. If the time zone is not set, the value is parsed using the current time zone setting of the system.
Date and time information is stored in H2 database files with or without time zone information depending on used data type. The destroy-method will help prevent exceptions on hot-redeployment or when restarting the server. The standard H2 jar can be dropped in as a bundle in an OSGi container. Any other standard property will be rejected.
0コメント