This is my 2nd day using Liquibase.
I have a 'backup' or 'Repositry' with the database that I need to create locally on my PC.
I have looked at the documentation, but Im realy not 100% clear on how to run it.
Ive updated the Liquibase.properties file to reflect the correct paths and username and passwords.
How do you run the update command to generate the tables and test data.
Windows 7
The Liquibase documentation on 'Adding Liquibase to an existing project' is probably the best place to start. Basically, you want to set the properties file so that it refers to the existing 'backup' database, and then run liquibase generateChangeLog
This will connect to the existing database and generate a file that contains the structure of the existing database expressed (typically) in an XML file called a changelog. You then create a new properies file that will connect to your local database and use liquibase update to apply the changelog to the local database and populate the structure. Note that this does not typically transfer the data from the existing database to the new database, just the structure - the tables, keys, indexes, etc. If you want to have test data as well, you can either export that data from the existing database, or you might look into crafting the changesets manually. To export the data, a command like this would be used:
java -jar liquibase.jar --changeLogFile="./data/<insert file name> " --diffTypes="data" generateChangeLog
Related
In MS SQL Server, after creating database completely, we have file script.sql and anyone want to create our database, they just need to run that file script.sql
I don't know whether if we can export that kind of file in MongoDB ?
mongoDB is "schema less" database system meaning that you can insert data without the initial schema definition like in MS SQL Server. You may create your indexes at later stage and prapare a .js file to execute it every time if you want to have the same indexes every time in new deployments or you can make initial empty mongodump and do mongorestore every time you need same indices.
I have a question regarding Flyway and managing multiple schemas. I have multiple schemas (schema1, schema2, schema3) with different deployment schedules and different folder locations (sql/schema1, sql/schema2, sql/schema3) with different code.
I want to Flyway to create the schemas before the code deployment but how do I set this up in a single config file? I read the Flyway doc (https://flywaydb.org/documentation/faq#multiple-schemas) but is the example using a single config file? or do i need to create multiple config files (one per schema)?
Can i achieve the same setting comma delimited schema list? will "Schema1" only look in the "sql/Schema1" location? I really dont want Schema1 pulling code from a different folder i.e. sql/Schema2, etc.
Thanks in advance!
When using Flyway with multiple schemas, you need to explicitly say in the sql statements which schema the sql is going to change. You can do this by putting an ALTER SESSION SET CURRENT_SCHEMA=schema1 at the top of each migration file, or prefixing all your statements like CREATE TABLE schema1.bananas.
If this is not practical, it would be best to create a number of config files, each with a single schema specified, and a single location specified. e.g.
flyway.schemas=schema1
flyway.locations=filesystem:sql/schema1
Then you can run Flyway with each config file individually to migrate that particular schema.
I want Liquibase, to generate a changelog, from this DB 'testing'. Is it possible?
I have an existing database already, with its tables and data inside.
jdbc:mysql://localhost:3306/testing
Now, I want Liquibase, to generate a changelog, from this DB 'testing'. Is it possible?
This is my command, but it doesn't work.
liquibase --driver=com.mysql.jdbc.Driver --classpath=C:\mysql-connector-java-5.1.47.jar
--changeLogFile=C:\db.changelog.xml --url="jdbc:mysql://localhost:3306/testing"
--username=root generateChangeLog
I don't use any password.
The error is related to --changeLogFile=C:\db.changelog.xml
I thought, Liquibase will refer to my DB 'testing', and generate changelog, with name 'db.changelog.xml' in folder C.
Which part I'm wrong? Do I miss something?
Or maybe, Liquibase is not intended, to generate changelog, from existing DB?
Or maybe, Liquibase is intended, to generate DB, from changelog only? And not vice versa?
This is possible. You might be having trouble since you are writing to a file in the root of your c: drive. Try c:\temp\changelog instead.
My experience is that liquibase works in increments. So if you run that command on your database, it will produce a file as if everything in the database has to be created in the changelog file (as if starting with a completely empty database).
If you read the text on Liquibase's site regarding this command, it says:
When starting to use Liquibase on an existing database, it is often useful, particularly for testing, to have a way to generate the change log to create the current database schema.
This means that if you:
Execute this command once against your dev database
Run the result against a new database (let's say test)
Run it again on your dev database
Run that file against your test database
You will get a load of errors stating that functions already exist.
I gather that the idea behind this is that you create new entries in the changelog files and executing them against ALL your databases, instead of using other tools and using liquibase for the delta.
Sample entry
<changeSet author="liquibase-docs" id="addColumn-example">
<addColumn catalogName="cat" schemaName="public" tableName="YY">
<column name="xx" type="varchar(255)"/>
</addColumn>
</changeSet>
SQL equivalent
ALTER TABLE yy ADD COLUMN xx INT
I am new to HSQLDB and want to create a persistent database so that when opening HSQLDB, the already created tables with their contents exist. I read about HSQLDB in the documentation, but cannot find the information. My current HSQLDB.bat is the following:
cd %HSQLDB%
java -cp ../lib/hsqldb.jar org.hsqldb.util.DatabaseManagerSwing
REM java -cp ../lib/hsqldb.jar org.hsqldb.server.Server
REM java -classpath lib/hsqldb.jar org.hsqldb.server.Server --database.0 file:hsqldb/demodb --dbname.0 testdb
When running the batch, the following dialogue opens:
Note that the URL filed contains jdbc:hsqldb:mem:..
After [OK], I call two scripts, one creating two tables, the other filling them with test data. But reopening HSQLDB does not read the tables with their data.
What is missing, what is wrong? A SHUTDOWN does not change anything. I also replaced mem with file, but could not make the database persistent. What did I oversee in the HSQLDB guide?
Use the drop-down list for Type: and select HSQL Database Engine Standalone, then edit the suggested URL to add your database file path such as jdbc:hsqldb:file:///C:/Program Files/hsqldb-2.5.0/hsqldb/data/dbname where the last part of the path is the name of the database files.
Absolute paths are preferred to avoid dependency on the directory in which you execute your batch.
I've a Sybase database where I will make a LOT of changes, and I would like to make my changes (currently using PowerDesigner 16), save it as .SQL then generate a .SQL to migrate my initial database to the new database structure.
I don't care about the data, I just want to update the structure with this script.
Any idea how to create this script?
EDIT: It has nothing to do with the given "duplicate", the other ticket is speaking on how to export the sql for SP/... In my case I only want the difference between the two sql
If you don't have one, you can create a model from your initial database, with File > Reverse Engineer > Database.
Create a copy of this model with File > Save As (as type Archived PDM), say copy.apm.
Then modify the model as you wish.
Then use Database > Apply Model Changes to Database, using the option Using an archive model (select the above copy.apm), to generate the ALTER script.
Anybody looking for a program agnostic way of generating the DDL for a database could use the ddlgen program that comes with ASE
See http://infocenter.sybase.com/help/index.jsp?topic=/com.sybase.infocenter.dc30191.1572/html/utilityguide/CHDBBGGC.htm
So to create the DDL of database pubs2, you could do something like
ddlgen -Usa -Ppassword123 -SSERVERNAME -TDB -Npubs2 -Ooutput_file.sql