Develop Reference

Liquibase: addForeignKeyConstraint not supported for SQLite

Using the following changeset in liquibase to create a table with a foreign key is possible and works.
<changeSet author="cibn" context="initialSchema" id="initialSchema-edited-1.0.4">
<createTable tableName="prices">
<column name="articleId" type="String">
<constraints nullable="false" foreignKeyName="fk_articles_articleId" references="articles(articleId)"/>
</column>
...
</changeSet>
However, the addForeignKeyConstraint change after creation of the initial schema is not supported.
https://www.liquibase.org/documentation/changes/add_foreign_key_constraint.html
Why? and could this be changed?

I believe that's because ADD CONSTRAINT is not supported by SQLite for ALTER TABLE feature, and that's exactly what Liquibase does during addForeignKeyConstraint change.
Here's the documentation SQL Features That SQLite Does Not Implement
Only the RENAME TABLE, ADD COLUMN, and RENAME COLUMN variants of the ALTER TABLE command are supported. Other kinds of ALTER TABLE operations such as DROP COLUMN, ALTER COLUMN, ADD CONSTRAINT, and so forth are omitted.

Autoincrement in liquibase

How do i set the autoincrement property using 'startWith' on a column in PostgreSQL using liquibase??
For some reason it always starts from 1. I tried using a custom sequence but that didn't help either.
<column autoIncrement="true" startWith="100" name="id" type="bigint">
That's my current column definition which does not work.
EDIT:
I want to import data from csv using liquibase. I tried the following:
<changeSet author="author" id="createSequence">
<createSequence
incrementBy="1"
sequenceName="mytable_id_seq"
startValue="1000"/>
</changeSet>
</changeSet>
<changeSet author="author" id="1-mytable">
<createTable tableName="mytable">
<column name="id" type="BIGSERIAL" defaultValueComputed="nextval('mytable_id_seq')">
<constraints primaryKey="true" primaryKeyName="mytable_pkey"/>
</column>
</createTable>
<loadData encoding="UTF-8"
file="liquibase/data/mytable.csv"
separator=","
tableName="mytable">
</loadData>
</changeSet>
If i try this I receive the following error 'currval of sequence "table_id_seq" is not yet defined in this session' and I think that it uses the sequence from the public schema instead of what i have set to liquibase.
Another thing i tried was to update it manually:
ALTER SEQUENCE mytable_id_seq restart with 100;
In this case the sequence used was the one from the public schema, but i want to use the schema set to liquibase

Instead of using bigserial which is an autoincrementing bigint specific to postgres use bigint if you are going to be setting up your own increment and sequence.
"The data types smallserial, serial and bigserial are not true types, but merely a notational convenience for creating unique identifier columns (similar to the AUTO_INCREMENT property supported by some other databases). In the current implementation, specifying:"
CREATE TABLE tablename (
colname SERIAL
);
is the same as
CREATE SEQUENCE tablename_colname_seq AS integer;
CREATE TABLE tablename (
colname integer NOT NULL DEFAULT nextval('tablename_colname_seq')
);
ALTER SEQUENCE tablename_colname_seq OWNED BY tablename.colname;
From here
https://www.postgresql.org/docs/12/datatype-numeric.html

hibernate insert duplicate key, i use mysql [duplicate]

I am working on a database application which is mostly read-only, but there is one table which records user movement in the app and has a large number of writes to it. For every few thousand writes, we see a few exceptions in the error log like so:
[WARN][2009-07-30 11:09:20,083][org.hibernate.util.JDBCExceptionReporter] SQL Error: 1062, SQLState: 23000
[ERROR][2009-07-30 11:09:20,083][org.hibernate.util.JDBCExceptionReporter] Duplicate entry '17011' for key 1
[ERROR][2009-07-30 11:09:20,083][org.hibernate.event.def.AbstractFlushingEventListener] Could not synchronize database state with session
org.hibernate.exception.ConstraintViolationException: Could not execute JDBC batch update
at org.hibernate.exception.SQLStateConverter.convert(SQLStateConverter.java:94)
at org.hibernate.exception.JDBCExceptionHelper.convert(JDBCExceptionHelper.java:66)
at org.hibernate.jdbc.AbstractBatcher.executeBatch(AbstractBatcher.java:275)
The table in question has the following schema:
CREATE TABLE IF NOT EXISTS `my_table` (
`id` int(11) NOT NULL,
`data1` int(11) NOT NULL,
`data2` int(11) NOT NULL,
`timestamp` datetime default NULL,
PRIMARY KEY (`id`)
) ENGINE=MyISAM DEFAULT CHARSET=latin1 COLLATE=latin1_general_ci;
And the corresponding Hibernate mapping XML:
<hibernate-mapping>
<class name="mycorp.MyClass" table="my_table">
<id name="id" column="id" type="java.lang.Integer">
<generator class="increment"/>
</id>
<property name="data1" column="data1" type="java.lang.Integer"/>
<property name="data2" column="data2" type="java.lang.Integer"/>
<property name="timestamp" column="timestamp" type="java.util.Date"/>
</class>
</hibernate-mapping>
It is possible, though unlikely, that multiple instances of our webapp could be writing to the database at once, since we version numbers in our webapp context to seamlessly release new versions of the applications. Clients with the old version of the application cached in their web browser would thus access the old versions of the server, which we undeploy after a few weeks.
Anyways, I'm not convinced that this is the problem, but I'm suspicious that there is some synchronization issue between MySQL and Hibernate at hand here. Would changing my generator to sequence, seqhilo or hilo help? Also, if you can provide an example of setting up such a generator in MySQL, that would be very helpful, as most of the resources online are simply copy-pasted from the woefully minimalistic examples in the Hibernate manual.

Increment is definitely bad if you have more than one process writing to the same table - you're bound to have collisions.
Since it is MySQL we're talking about, the easiest thing to use would be identity. In your Hibernate mapping:
<generator class="identity"/>
In your MySQL script:
CREATE TABLE IF NOT EXISTS `my_table` (
`id` int(11) NOT NULL AUTO_INCREMENT,
`data1` int(11) NOT NULL,
`data2` int(11) NOT NULL,
`timestamp` datetime default NULL,
PRIMARY KEY (`id`)
) ENGINE=MyISAM DEFAULT CHARSET=latin1 COLLATE=latin1_general_ci;
To alter an existing table:
ALTER TABLE `my_table`
CHANGE COLUMN `id` `id` int(11) NOT NULL AUTO_INCREMENT=$NEW_VALUE$;
where $NEW_VALUE$ should be replaced by the next available id so that sequence does not reset to 1.

Hibernate Identity column but not primary key

I have one sqlserver 2008 r2 datatable, it has one column autoId int identity(1,1), but it's not the primary key, another column varchar(20) is the one.
question is : how do i config the hbm file?
bellow is my config file,but it got errors when i try to save one instance.
"Cannot insert explicit value for identity column in table 'acct_info' when IDENTITY_INSERT is set to OFF."
<property name="autoId" type="int">
<column name="auto_id" not-null="true" unique="true" />
</property>

There can be two reasons , either you don't have sufficient privileges in DB for IDENTITY INSERT or there is mismatch in the mechanism by which you are trying to set an identifier in hibernate and DB layer.
You can have a look at your id generation strategy in hibernate definition file
In DB you can change to Set IDENTITY_INSERT to "ON"
Pick a different generator class

Java Hibernate id auto increment

Hy
I'v a little problem with hibernate on netbeans.
I've a table with an Auto increment id :
CREATE TABLE "DVD"
(
"DVD_ID" INT not null primary key
GENERATED ALWAYS AS IDENTITY
(START WITH 1, INCREMENT BY 1),
"TITLE" VARCHAR(150),
"COM" LONG VARCHAR,
"COVER" VARCHAR(150)
);
But this auto increment is not properly detected with Reverse Engineering.
I get a map file with this :
<id name="dvdId" type="int">
<column name="DVD_ID" />
<generator class="assigned" />
</id>
i've looked on google and on this site ... foud some stuf but i'm still stuck..
i've tried to add insert="false" update="false" on the map file but i get back :
Caused by: org.xml.sax.SAXParseException: Attribute "insert" must be declared for element type "id".
Anny help will be pleased
Vincent

Change the generator class to "identity" if you want an auto-generated value from the database.

I'm not sure if I got you well but if you aren't using user input for "id" and you want it to autogenerate and autoincrement, then just change class="assigned" to class="increment".