Grails H2 Database DbConsole - Database backup - mysql

Question

I have grails 2.0 which comes with H2 database and dbconsole.
I want to take the database backup from dbconsole:
databse url : "jdbc:mysql://localhost/opal"
Username : root
password: (none)
in the tools section of dbconsole there is a option to backup the database.
it will ask 3 things
Target file name: ~/backup.zip(by default)
Source directory:
Source database name: opal (name of my database)
when i press run , it gives error,
No database files have been found in directory E:/Workspace/opal for the database opal
can anybody suggest how to take the database backup.

Answer 1

I've never gotten that to work. If you just want a snapshot of data for development (load on startup) I found that using DBUnit to export/import the data worked great for me. I wrote a script to export it that I call from the console:
class DataExport {
def ctx = SCH.servletContext.getAttribute(GA.APPLICATION_CONTEXT)
def exportData() {
println "-->export"
def ds = ctx.dataSourceUnproxied
println ds.dump()
Connection jdbcConnection = ctx.dataSourceUnproxied.getConnection()
IDatabaseConnection connection = new DatabaseConnection(jdbcConnection);
println connection.dump()
ITableFilter filter = new DatabaseSequenceFilter(connection);
IDataSet dataset = new FilteredDataSet(filter, connection.createDataSet());
FlatXmlDataSet.write(dataset, new File("full.xml").newWriter());
connection.close()
}
}
And then in bootstrap you can load it back in
Connection jdbcConnection
FlatXmlDataSet dataSet = new FlatXmlDataSetBuilder().build(new ClassPathResource('resources/data/full.xml').inputStream)
jdbcConnection = ctx.dataSource.getConnection()
IDatabaseConnection connection = new DatabaseConnection(jdbcConnection);
try {
DatabaseOperation.INSERT.execute(connection, dataSet)
} catch(e) {
e.printStackTrace()
throw(e)
} finally {
jdbcConnection.close()
}
log.info 'data loaded'

Answer 2

I think this site would be quite helpful. Or, on taking dump of the database and to restore the database try snippet below:
mysqldump -u root -p my_database Table1 Table2 > /home/user/tablesDump.sql;
and to restore the table(s) back:
mysql -u root -p my_database_2
mysql> source /home/user/tablesDump.sql;
Both tables were created in my_database_2.