I'm new to java and hibernate framework, can you please explain to me if I have to make a Hibernate cfg file for every table I have or only this is enough. At the moment I have this and it takes care of a person table, now if I want to also work with a new table (exam in my case) do I need to write a new file and change the mapping?
<?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.connection.driver_class">com.mysql.jdbc.Driver</property>
<property name="hibernate.connection.url">jdbc:mysql://localhost:3310/scheduler</property>
<property name="hibernate.connection.username">root</property>
<property name="hibernate.connection.password">blanked-out-as-this-is-s3cr3t</property>
<property name="hibernate.dialect">org.hibernate.dialect.MySQLDialect</property>
<property name="show_sql">true</property>
<property name="hbm2ddl.auto">update</property>
<mapping class="com.scheduler.backend.model.Person"></mapping>
</session-factory>
</hibernate-configuration>
You just need only ONE cfg file, if you need to add a new table just post it as
<mapping class="com.scheduler.backend.model.NEW_MODEL"></mapping>
So the file be like this:
<?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.connection.driver_class">com.mysql.jdbc.Driver</property>
<property name="hibernate.connection.url">jdbc:mysql://localhost:3310/scheduler</property>
<property name="hibernate.connection.username">root</property>
<property name="hibernate.connection.password">blanked-out-as-this-is-s3cr3t</property>
<property name="hibernate.dialect">org.hibernate.dialect.MySQLDialect</property>
<property name="show_sql">true</property>
<property name="hbm2ddl.auto">update</property>
<mapping class="com.scheduler.backend.model.Person"></mapping>
<mapping class="com.scheduler.backend.model.NEW_ONE"></mapping>
<mapping class="com.scheduler.backend.model.NEW_ONE"></mapping>
</session-factory>
</hibernate-configuration>
Related
This is the cfg file:
<?xml version='1.0' encoding='utf-8'?>
<!DOCTYPE hibernate-configuration PUBLIC
"-//Hibernate/Hibernate Configuration DTD//EN"
"http://www.hibernate.org/dtd/hibernate-configuration-3.0.dtd">
<hibernate-configuration>
<session-factory>
<property name="hibernate.connection.driver_class">
com.mysql.jdbc.Driver
</property>
<property name="hibernate.connection.url">
jdbc:mysql://localhost:3306/employee
</property>
<property name="hibernate.connection.username">root</property>
<property
name="hibernate.connection.password">Chitaramea2198</property>
<property name="hibernate.connection.pool_size">50</property>
<property name="show_sql">true</property>
<property name="dialect">
org.hibernate.dialect.MySQLDialect
</property>
<property name="hibernate.hbm2ddl.auto">create</property>
<mapping resource="src/Main/Employee.hbm.xml"/>
</session-factory>
</hibernate-configuration>
The error:
Exception in thread "main" org.hibernate.MappingNotFoundException:
resource: src/Main/Employee.hbm.xml not found
My project structure:
Does anybody know how could I fix this error? I tried different
paths for the hbm xml file , i even tried to move it same place
with the cfg file but it still doesnt work, I am a newbie and dont
really know much about it, I tried to follow some tutorials but I
still cannot manage to make it work.
Thank you!
This is the project:
https://wetransfer.com/downloads/8d00be7b4a302b7cca39c87a6bc42f4a20200125220719/309934c0d43ae5bb15201ba3850ba14b20200125220719/01da4d
When I run my program I get this error:
Error: Could not find or load main class
org.hibernate.dialect.DB2390Dialect
I have checked all the jar files required are in place. Please help. I guess there is problem with the hibernate configuration file. Find the configuration file below:
<?xml version="1.0" encoding="UTF-8"?>
<!DOCTYPE hibernate-configuration PUBLIC "-//Hibernate/Hibernate Configuration DTD 3.0//EN"
"http://www.hibernate.org/dtd/hibernate-configuration-3.0.dtd">
<hibernate-configuration>
<session-factory>
<property name="hibernate.connection.driver_class">oracle.jdbc.driver.OracleDriver</property>
<property name="hibernate.connection.password">batch</property>
<property name="hibernate.connection.url">jdbc:oracle:thin:#localhost:1521:xe</property>
<property name="hibernate.connection.username">batch</property>
<property name="hibernate.dialect">org.hibernate.dialect.OracleDialect</property>
<property name="hibernate.show_sql">true</property>
<property name="hibernate.hbm2ddl.auto">none</property>
<mapping resource="galaxe.model.Network" />
</session-factory>
</hibernate-configuration>
In configuration you need to mention for DB2390 as below
property name="hibernate.dialect" value="org.hibernate.dialect.DB2390Dialect"
if you use oracle, it will be different
property name="hibernate.dialect" value="org.hibernate.dialect.Oracle10gDialect">
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've created a user called "root#localhost" in phpMyadmin
My hibernate.cfg.xml looks like this:
<?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.connection.driver_class">com.mysql.jdbc.Driver</property>
<property name="hibernate.connection.url">jdbc:mysql://localhost:3306/autorepairshops</property>
<property name="hibernate.connection.username">root</property>
<property name="hibernate.dialect">org.hibernate.dialect.MySQLDialect</property>
<property name="hibernate.current_session_context_class">thread</property>
</session-factory>
</hibernate-configuration>
Still I get this exception when it tries to connect to the database:
Access denied for user 'root'#'localhost' (using password: NO)
I'm using Tomcat server, I started it yesterday morning and it continuously runs until this morning, but when I tried to login in my application it shows:
org.hibernate.TransactionException: JDBC rollback failed
What is the problem - is any persistent session here or is sessionfactory null?
I got the problem ,
ie i attached a different jar named c3p0-0.9.1.jar file and add some lines in hibernate-cfg.xml file
The code is :
<?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.MySQL5InnoDBDialect</property>
<property name="hibernate.connection.driver_class">com.mysql.jdbc.Driver</property>
<property name="hibernate.connection.url">jdbc:mysql://localhost:3306/<your db name></property>
<property name="hibernate.connection.username">root</property>
<property name="hibernate.connection.password">test</property>
<property name="hibernate.connection.autocommit">false</property>
<property name="hibernate.hbm2ddl.auto">update</property>
<property name="hibernate.show_sql">true</property>
<property name="hibernate.format_sql">true</property>
<property name="hibernate.jdbc.batch_size">50</property>
//Here is the extra code for handling the above problem.....
**<property name="hibernate.c3p0.max_size">1</property>
<property name="hibernate.c3p0.min_size">0</property>
<property name="hibernate.c3p0.timeout">5000</property>
<property name="hibernate.c3p0.max_statements">1000</property>
<property name="hibernate.c3p0.idle_test_period">300</property>
<property name="hibernate.c3p0.acquire_increment">1</property>**
</session-factory>
</hibernate-configuration>