hibernate is not able to create a table why...?
<property name="hibernate.dialect">org.hibernate.dialect.MySQLDialect</property>
<property name="hibernate.connection.driver_class">com.mysql.jdbc.Driver</property>
<property name="hibernate.connection.url">jdbc:mysql://localhost:3306/e_shop</property>
<property name="hibernate.connection.username">root</property>
<property name="hibernate.hbm2ddl.auto">create</property>
<property name="hibernate.show_sql">true</property>
AnnotationConfiguration cfs=new AnnotationConfiguration();
cfs.configure("daoHibernate/hibernate.cfg.xml");
new SchemaExport(cfs).create(true,true);
my all table are getting alter and table getting drop then again created why how to start a new session please give a reply
<property name="hibernate.hbm2ddl.auto">create</property>
because of this, each time it will drop and create tables.
<property name="hibernate.hbm2ddl.auto">update</property>
use update instead of create.
Related
I have a little problem when I try to upload XML file to BaseLinker.
The problem is that the properties in XML are mixed, for example one time property name of price is 4th, next time is 6th or 8th. Because of it BaseLinker didn't upload it correctly.
Some of my XML :
<property name="grubość">1</property>
<property name="grubość ścianki">1</property>
<property name="średnica">400</property>
<property name="wysokość">400</property>
<property name="Pojemność (l)">50</property>
<property name="opis">400</property>
<property name="wymiary zewnętrzne">400</property>
<property name="waga">50</property>
<property name="wymiary">1</property>
<property name="moc">1</property>
<property name="napięcie">400x/400h</property>
<property name="categoryId">194</property>
<property name="productCode">832806</property>
<property name="largeSize">0</property>
<property name="tillStockLasts">0</property>
<property name="basePrice">749.00</property>
<property name="productId">950</property>
other line :
<property name="wysokość">450</property>
<property name="wymiary zewnętrzne">śr. 450x(H) 450 </property>
<property name="Pojemność (l)">70</property>
<property name="wymiary">śr.450x(H)450</property>
<property name="categoryId">194</property>
<property name="productCode">832929</property>
<property name="largeSize">0</property>
<property name="tillStockLasts">0</property>
<property name="basePrice">849.00</property>
<property name="productId">950</property>
Is it possible to parse it or use java program that can sort it in correct order?
For example I wanna have XML of properties like :
property name="wysokość" property name="szerokosc" property name="productCode" property name="productID"
and so on...
Is some way to drop and create table on start of hibernate session? But only one from few mapped tables.
My hibernate configuration:
<hibernate-configuration>
<session-factory>
<property name="connection.driver_class">com.mysql.cj.jdbc.Driver</property>
<property name="connection.url">jdbc:mysql://localhost:3306/smart_home</property>
<property name="connection.username">root</property>
<property name="connection.password"></property>
<property name="connection.pool_size">1</property>
<property name="dialect">org.hibernate.dialect.MySQLDialect</property>
<property name="current_session_context_class">thread</property>
<property name="show_sql">false</property>
<property name="hbm2ddl.auto">update</property>
<mapping class="pl.smart.home.database.User" />
<mapping class="pl.smart.home.database.UnrecognisedDevice" />
<mapping class="pl.smart.home.database.Sensor" />
<mapping class="pl.smart.home.database.TypeDevice" />
<mapping class="pl.smart.home.database.Event" />
<mapping class="pl.smart.home.database.RecognisedDevice" />
<mapping class="pl.smart.home.database.Status" />
</session-factory>
I want drop and create "event" table.
You can use create-drop
<property name="hbm2ddl.auto">create-drop</property>
Drop the schema and recreate it on SessionFactory startup. Additionally, drop the schema on SessionFactory shutdown.
I use java version 8.0.2 and Mysql Gui 9:02 software.I try to create Hibernate Mapping Files and PJOS from Database but I always get the following error message
Hibernate configuration fails with message:Could not get list of suggested identity strategies from database. Probably a JDBC driver problem. see message.log for exception details.
hibernate.cfg.xml
<?xml version="1.0" encoding="UTF-8"?>
<!DOCTYPE hibernate-configuration PUBLIC "-//Hibernate/Hibernate Configuration DTD 3.0//EN" "http://hibernate.sourceforge.net/hibernate-configuration-3.0.dtd">
<hibernate-configuration>
<session-factory>
<property name="hibernate.dialect">org.hibernate.dialect.MySQLDialect</property>
<property name="hibernate.connection.driver_class">com.mysql.jdbc.Driver</property>
<property name="hibernate.connection.url">jdbc:mysql://localhost:3306/mind_1.0.2?zeroDateTimeBehavior=convertToNull</property>
<property name="hibernate.connection.username">root</property>
<property name="hibernate.show_sql">true</property>
<property name="hibernate.current_session_context_class">thread</property>
</session-factory>
</hibernate-configuration>
Please Help Me!
I think you missed the db password tag.
<property name="hibernate.connection.password">admin</property>
<property name="hibernate.connection.driver_class">com.mysql.jdbc.Driver
</property>
<property name="hibernate.connection.username">root</property>
<property name="hibernate.connection.password">admin</property>
<property name="hibernate.connection.url">jdbc:mysql://localhost:3306/DBname
</property>
<property name="hibernate.dialect">org.hibernate.dialect.MySQLDialect
</property>
<property name="show_sql">false</property>
<property name="hbm2ddl.auto">update</property>
Maybe your database name is not right.
And try to add
<property name="hibernate.default_schema">dbo</property>
I have a Java EE Hibernate project, and I'm using MySQL as a database.
I want that when I first time run the project, it will create the database automatically.
This is my hibernate.cnf.xml:
<?xml version='1.0' encoding='utf-8' ?>
<!DOCTYPE hibernate-configuration PUBLIC
"-//Hibernate/Hibernate Configuration DTD 3.0//EN"
"http://hibernate.sourceforge.net/hibernate-configuration-3.0.dtd" >
<hibernate-configuration>
<session-factory>
<property name="connection.driver_class">com.mysql.jdbc.Driver</property>
<property name="connection.url">jdbc:mysql://localhost/InternetProject</property>
<property name="connection.username">root</property>
<property name="connection.password"></property>
<property name="connection.pool_size">10</property>
<property name="dialect">org.hibernate.dialect.MySQLDialect</property>
<property name="hibernate.hbm2ddl.auto">update</property>
<property name="show_sql">true</property>
<mapping class="entities.Business" />
<mapping class="entities.Coupon" />
<mapping class="entities.User" />
<mapping class="entities.LastLogin" />
</session-factory>
</hibernate-configuration>
When I first time run this project on another computer, how can I make the database InternetProject to be created?
According to the config file, it might already do it and I'm not aware to it.
Thanks in advance.
<property name="hibernate.hbm2ddl.auto">create</property>
will create tables. But it will not create database. Change the connection url to generate the database.
<property name="connection.driver_class">com.mysql.jdbc.Driver</property>
<property name="connection.url">jdbc:mysql://localhost/InternetProject?createDatabaseIfNotExist=true</property>
<property name="connection.username">root</property>
<property name="connection.password"></property>
<property name="connection.pool_size">10</property>
Update : character encoding when creating database
<property name="connection.url">
jdbc:mysql://localhost/InternetProject?createDatabaseIfNotExist=true&useUnicode=yes&characterEncoding=UTF-8
</property>
<property name="hibernate.hbm2ddl.auto">create</property>
will do
Hibernate will not create the database for you, only the tables. To create the database you need to tell MySQL to create it if it does'nt already exist by adding a parameter to the URL. E.g.:
jdbc:mysql://db:3306/mydatabase?createDatabaseIfNotExist=true
There are multiple option for auto property.
create - It creates new tables corresponding mapping or annotation. It drops existing tables and data.
update - It keeps existing data and tables. It updates schema. here we have to take care contrants.
create-drop - It is same like create but once session gets closed it drops everything.
validate - it validates or matches schema with map or annotation. It's valid for Production environment.
<!-- create create-drop validate update -->
<property name="hbm2ddl.auto">update</property>
I hope it helps.
I have created Java application using Hibernate with this configuration:
<hibernate-configuration>
<session-factory>
<property name="hibernate.connection.driver_class">com.mysql.jdbc.Driver</property>
<property name="hibernate.connection.url">jdbc:mysql://localhost:3306 /bee</property>
<property name="hibernate.dialect">org.hibernate.dialect.MySQLDialect</property>
<property name="hibernate.query.factory_class">org.hibernate.hql.classic.ClassicQueryTranslatorFactory</property>
<property name="connection.username">root</property>
<property name="connection.password"/>
<property name="hibernate.connection.charSet">UTF-8</property>
<property name="hibernate.connection.characterEncoding">UTF-8</property>
<property name="hibernate.connection.useUnicode">true</property>
<mapping resource="DatabaseMapping.hbm.xml"/>
</session-factory>
</hibernate-configuration>
Everything works fine when Iam using jdbc:mysql://localhost..., but now I need to have the database embedded in my application. Which database should I use? I need to have all my data stored and load it after start the application, update data, save, delete. I use HQL query or SQL query.
What is the simplest way to make the database embedded? I don´t want to change my queries. It would be fine to change only hibernate configuration and set it to the embedded database, is it possible?
One of the advantages of ORM's like Hibernate is to shield you from DB differences. You can use any one of the below as an embedded DB solution. Just change the dialect, driver and URL in hibernate cfg file.
H2
SQLite
HSQLDB
Hava a look at using the H2 database in embedded mode
<hibernate-configuration>
<session-factory>
<property name="hibernate.connection.driver_class">org.h2.Driver</property>
<property name="hibernate.connection.url">jdbc:h2:~/test</property>
<property name="hibernate.dialect">org.hibernate.dialect.H2Dialect</property>
<property name="hibernate.query.factory_class">org.hibernate.hql.classic.ClassicQueryTranslatorFactory</property>
<property name="connection.username">sa</property>
<property name="connection.password"/>
<property name="hibernate.connection.charSet">UTF-8</property>
<property name="hibernate.connection.characterEncoding">UTF-8</property>
<property name="hibernate.connection.useUnicode">true</property>
<property name="hibernate.default_schema">PUBLIC</property>
<mapping resource="DatabaseMapping.hbm.xml"/>
</session-factory>
</hibernate-configuration>
If you don't want to change your queries, consider mysql-mxj (embedded mysql) http://dev.mysql.com/doc/connector-mxj/en/connector-mxj.html
It is not under active development (thanks Oracle). But is prefectly usable and the connector is open source. It is trivial to embed different versions of mysql, but the latest mxj connector embeds 5.5.9