Am using JPA into my application and then the when insert different objects the database use sequential ids.
For Example:
If i have table member and table user , when inserting object of type user will take id = 1 then add object into table member will take id = 2 .
The problem is : i imported a .sql file into the database.
Then when i insert a new record from my application it cause an exception because it use ids already added.
How can i solve this problem ?
You can set the start value for AUTO_INCREMENT as
ALTER TABLE tbl AUTO_INCREMENT = 100;
See also:
3.6.9. Using AUTO_INCREMENT
Related
I am using java DB database and NetBeans 8.0 for a desktop application
I am also using a PreparedStatement to query the database.
below is the code for creating the tables.
CREATE TABLE ALUMNUS (
ALUMNUA_ID INT NOT NULL PRIMARY KEY
GENERATED ALWAYS AS IDENTITY (START WITH 1, INCREMENT BY 1),
FIRST_NAME VARCHAR (45),
LAST_NAME VARCHAR (45),
OTHER_NAME VARCHAR (100)
);
CREATE TABLE DUES (
ID INT NOT NULL PRIMARY KEY
GENERATED ALWAYS AS IDENTITY (START WITH 1, INCREMENT BY 1),
PAYMENT_YEAR DATE,
AMOUNT DOUBLE,
ALUMNUS_ID INT
);
--FOREIGN KEY
ALTER TABLE APP.DUES
ADD FOREIGN KEY (ALUMNUS_ID) REFERENCES APP.ALUMNUS(ID);
Now I want to insert, delete and update the foreign key values in APP.DUES table. what is the best option; trigger , stored procedure or the preparedstatement?
An example will be good.
If you want to primarily insert into the DUES table, you would use a sub select in SQL. I havent tested it with Java DB, but it basically looks like:
INSERT INTO DUES(PAYMENT_YEAR, AMOUNT,ALUMNUS_ID)
VALUES(2014, 100.0,
(SELECT ALUMNUA_ID from ALUMNUS where ...));
You need to catch the "not found" error case and prepend a INSERT (and need to catch the duplicate case for that as well).
See also: Insert Data Into Tables Linked by Foreign Key
In my database I have table "Announcement" with fields:
id int,
text varchar,
sent_date date.
Also table "Group" with fields:
id int,
name varchar.
Each announcement submitted to any number of groups(from 1 to all). How to store this relation in database?
I'm using MySQL and Hibernate in java web project.
Create a third table (I call it announcement_group) with two columns:
announcement_id REFERENCES Announcement(id)
group_id REFERENCES Group (id)
Read more about Foreign Keys from the documentation here http://dev.mysql.com/doc/refman/5.6/en/create-table-foreign-keys.html
In your query you will want to use a
SELECT group_id WHERE announcement_id=<your id here> from announcement_group;
Till recent time i was using hibernate #Entity annotation to map to database tables.All the primary keys are annotated with #GeneratedValue(strategy = GenerationType.IDENTITY)
I got a scenario where i need to create new schema + migrate data from old schema into new schema.(with few column changes like drop, length and type)
After successful migration of data to new schema tables when i try to insert data using Application its throwing an exception
[ERROR] util.JDBCExceptionReporter DB2 SQL Error: SQLCODE=-803, SQLSTATE=23505, SQLERRMC=1; _NewSchema_._TableName_ , DRIVER=3.51.90
I believe that application is trying to insert rows again with Primary key value starting from 1 because same application is working fine with empty tables.
I want data rows to be inserted with its primary key value as highest value of existing rows primary key .
Any help will be thank full :)
Yes you can do that by altering the table. Alter the table and set starting index for identity column in DB2.
Suppose maximum rows for TBALE_A is 50 and name of identity column is TABLE_ID
ALTER TABLE TBALE_A ALTER COLUMN TABLE_ID
RESTART WITH 51
Your guess is correct, here is my solution, execute the following SQL to give the ID column a specified start position, then your application will work fine.
alter table TABLE_NAME alter column ID set GENERATED BY DEFAULT RESTART WITH 10000;
Hope to help you :)
In case of generation type , IDENTITY, you should look for identity column to be auto incemental.
#GeneratedValue(strategy = GenerationType.IDENTITY) required primary key column to be auto incremental.
I tried running this statement in Postgres:
insert into field (id, name) values (DEFAULT, 'Me')
and I got this error:
ERROR: null value in column "id" violates not-null constraint
I ended up having to manually set the id. The problem with that is when my app inserts a record I get a duplicate key error. I am building a java app using Play framework and ebean ORM. So the entire schema is generated automatically by ebean. In this case, what is the best practice for inserting a record manually into my db?
Edit:
Here is how I'm creating my Field class
#Entity
public class Field {
#id
public Long id;
public String name;
}
Edit:
I checked the field_seq sequence and it looks like this:
CREATE SEQUENCE public.field_seq INCREMENT BY 1 MINVALUE 1 MAXVALUE 9223372036854775807 START 1 CACHE 1;
Edit:
Here is the generated SQL in pgAdmin III:
CREATE TABLE field
(
id bigint NOT NULL,
created timestamp without time zone,
modified timestamp without time zone,
name character varying(255),
enabled boolean,
auto_set boolean,
section character varying(17),
input_type character varying(8),
user_id bigint,
CONSTRAINT pk_field PRIMARY KEY (id),
CONSTRAINT fk_field_user_3 FOREIGN KEY (user_id)
REFERENCES account (id) MATCH SIMPLE
ON UPDATE NO ACTION ON DELETE NO ACTION,
CONSTRAINT ck_field_input_type CHECK (input_type::text = ANY (ARRAY['TEXT'::character varying, 'TEXTAREA'::character varying]::text[])),
CONSTRAINT ck_field_section CHECK (section::text = ANY (ARRAY['MAIN_CONTACT_INFO'::character varying, 'PARTICIPANT_INFO'::character varying]::text[]))
);
CREATE INDEX ix_field_user_3
ON field
USING btree
(user_id);
There is no column default defined for field.id. Since the sequence public.field_seq seems to exist already (but is not attached to field.id) you can fix it with:
ALTER SEQUENCE field_seq OWNED BY field.id;
ALTER TABLE field
ALTER COLUMN id SET DEFAULT (nextval('field_seq'::regclass));
Make sure the sequence isn't in use for something else, though.
It would be much simpler to create your table like this to begin with:
CREATE TABLE field
(
id bigserial PRIMARY KEY,
...
);
Details on serial or bigserial in the manual.
Not sure how the the Play framework implements this.
This works.
insert into field (id, name) values (nextval('field_seq'), "Me");
I want to create an Entity class with database in Netbeans.
When I select a Data source jdbc/Ionbank (custom Jdbc connection Using JDBC-ODBC bridge with Ms SQL 2005 as database).
I see all the tables from that database.
All tables show no primary key, but they have primary keys in them.
Things I have tried :-
Created new 4-5 data source.
Created tables using query, and not the New table option.
Tried changing Odbc connection.
Tried using different drivers for the Jdbc-Odbc bridge like Sql4jdbc.jar, Jdts.jar.
I had same issue, but i solved it using the following: "New Entity Classes from Database" cannot process some tables, saying "no primary key"
A quote from that link helped me:
The problem will happen if you have foreign keys where upper case and lower case table names don't match the referenced table's definition.
For instance:
create table OkTable (
id int not null auto_increment
, primary key (id)
);
create table MisunderstoodTable(
id int not null auto_increment
oktable int not null
, primary key (id)
, foreign key ok (oktable) references oktable (id)
);
The MisunderstoodTable has a foreign key where the target table name doesn't match the lower/uppercase name of the referenced table.
To avoid this problem, just make sure you type your foreign key definitions while matching upper/lower casing for the targeted table.