DbStarter can also start the TCP server, however this is disabled by default. To enable it, use the parameter db. Here is the complete list of options. When the web application is stopped, the database connection will be closed automatically. The H2 Console is a standalone application and includes its own web server, but it can beused as a servlet as well. So far, only very few tests and benchmarks were run, but it seems that performance is similar to SQLite,except for opening and closing a database, which is not yet optimized in H2 H2 takes about 0.
Read operations seem to be a bit faster than SQLite, and write operations seem to be slower. So far, only very few tests have been run, and everything seems to work as expected. Fulltext search was not yet tested, however the native fulltext search should work. To create the smaller jar file, run the command. 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 indexesif necessary, and then query this table.
A fast way to load or import data sometimes called 'bulk load' from a CSV file isto 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 nextversion 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 filesneed 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, butSQL 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 followingexception 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 getone 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 specialtables 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.
By default, the console view of the H2 database is disabled. Before accessing the H2 database, we must enable it by using the following property. The following figure shows the console view of the H2 database. Step 2: Provide the Group name. We have provided com. Step 3: Provide the Artifact Id.
We have provided spring-boot-h2-database-example. Step 6: Click on the Generate button. When we click on the Generate button, it wraps the project in a Jar file and downloads it to the local system. Step 9: Create a package with the name com. Step Create a model class in the package com. We have created model class with the name Student. In the Books class, we have done the following:. Step Create a package with the name com.
Step Create a Controller class in the package com. We have created controller class with the name StudentController. In the StudentController class, we have done the following:. Step Create a Service class. The JDBC driver is a file with the extension. See the end of this section for a list of download locations. Once you have downloaded the driver you can store the driver's. Very likely yes. How are you running this program? Command line? Intellij run configuration? Also, can you tell me if you're using gradle?
If you are, there is a much easier way that doesn't require you to ever touch the jar file yourself — Julian.
Intellij run configuration and not using gradle — user Add a comment. Active Oldest Votes. Improve this answer. Julian Julian 1, 2 2 gold badges 13 13 silver badges 31 31 bronze badges. Main" error message. You can. If you are prompted to provide administrator permissions, click Continue.
Locate the line that defines the Java class path property java. You will need to replace h
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