Генерация схемы с помощью плагина Maven Hibernate3

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Генерация схемы с помощью плагина Maven Hibernate3

Post author:admin
Запись опубликована:2 мая, 2023
Post category:Вопросы по программированию

#hibernate #maven #hbm2ddl

#переход в спящий режим #maven #hbm2ddl

Вопрос:

Я пытаюсь настроить простой проект hibernate maven. Я выполняю шаги, упомянутые в главе 2 о существовании Java с hibernate (единственное отличие в том, что я использую maven вместо Ant). Однако, при попытке сгенерировать схему с помощью плагина maven hibernate 3, кажется, что он не способен создать требуемые таблицы.

Код и ресурсы

POM.xml

 <project xmlns="http://maven.apache.org/POM/4.0.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">
  <modelVersion>4.0.0</modelVersion>
  <groupId>com.gs.bce</groupId>
  <artifactId>SpringExample</artifactId>
  <version>0.0.1-SNAPSHOT</version>
  
  <properties>
    <maven.compiler.source>1.6</maven.compiler.source>
    <maven.compiler.target>1.6</maven.compiler.target>
    <project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
  </properties>
  
  
  <dependencies>
    <dependency>
        <groupId>org.springframework</groupId>
        <artifactId>spring-core</artifactId>
        <version>3.0.5.RELEASE</version>
    </dependency>
    <dependency>
        <groupId>org.springframework</groupId>
        <artifactId>spring-beans</artifactId>
        <version>3.0.5.RELEASE</version>
    </dependency>
    <dependency>
        <groupId>org.springframework</groupId>
        <artifactId>spring-context</artifactId>
        <version>3.0.5.RELEASE</version>
    </dependency>
  
    <dependency>
        <groupId>org.hsqldb</groupId>
        <artifactId>hsqldb</artifactId>
        <version>2.0.0</version>
    </dependency>
    <dependency>
        <groupId>org.hibernate</groupId>
        <artifactId>hibernate-c3p0</artifactId>
        <version>3.3.2.GA</version>
    
    </dependency>
    



    <dependency>
        <groupId>org.slf4j</groupId>
        <artifactId>slf4j-log4j12</artifactId>
        <version>1.5.8</version>
    </dependency>
    <dependency>
        <groupId>javassist</groupId>
        <artifactId>javassist</artifactId>
        <version>3.12.1.GA</version>
    </dependency>
  </dependencies>  
    <build>
    <plugins>
      <plugin>
        <groupId>org.codehaus.mojo</groupId>
        <artifactId>hibernate3-maven-plugin</artifactId>
        <version>2.2</version>
        
          <executions>
          <execution>
            <phase>process-classes</phase>
            <goals>
              <goal>hbm2ddl</goal>
            </goals>
          </execution>
        </executions>
        
        <configuration>
          <components>
            <component>
              <name>hbm2ddl</name>
              <implementation>jdbcconfiguration</implementation>
            </component>
            <component>
              <name>hbm2hbmxml</name>
              <outputDirectory>src/main/resources</outputDirectory>
            </component>
          </components>
          <componentProperties>
            <drop>true</drop>
            <configurationfile>/src/main/resources/hibernate.cfg.xml</configurationfile>
               <outputfilename>schema.sql</outputfilename>
          </componentProperties>
        </configuration>
         <dependencies>
            <dependency>
        <groupId>org.hsqldb</groupId>
        <artifactId>hsqldb</artifactId>
        <version>2.0.0</version>
    </dependency>
        </dependencies>
      </plugin>
    </plugins>
  </build>
</project>

Журнал вывода

Вывод моего основного класса, где он пытается получить доступ к таблице СООБЩЕНИЙ (как упомянуто в книге).

 18:27:34,357DEBUG SQL:111 - 
    select
        max(MESSAGE_ID) 
    from
        MESSAGES Hibernate: 
    select
        max(MESSAGE_ID) 
    from
        MESSAGES 18:27:34,363DEBUG JDBCExceptionReporter:92 - could not fetch initial value for increment generator [select max(MESSAGE_ID) from MESSAGES] java.sql.SQLException: user lacks privilege or object not found: MESSAGES

Обработка выходных данных

Вывод для цели классов процессов

 [INFO] Scanning for projects...
[INFO]                                                                         
[INFO] ------------------------------------------------------------------------
[INFO] Building SpringExample 0.0.1-SNAPSHOT
[INFO] ------------------------------------------------------------------------
[INFO] 
[INFO] --- maven-resources-plugin:2.4.3:resources (default-resources) @ SpringExample ---
[INFO] Using 'UTF-8' encoding to copy filtered resources.
[INFO] Copying 3 resources
[INFO] 
[INFO] --- maven-compiler-plugin:2.3.2:compile (default-compile) @ SpringExample ---
[INFO] Nothing to compile - all classes are up to date
[INFO] 
[INFO] >>> hibernate3-maven-plugin:2.2:hbm2ddl (default) @ SpringExample >>>
[INFO] 
[INFO] --- maven-resources-plugin:2.4.3:resources (default-resources) @ SpringExample ---
[INFO] Using 'UTF-8' encoding to copy filtered resources.
[INFO] Copying 3 resources
[INFO] 
[INFO] <<< hibernate3-maven-plugin:2.2:hbm2ddl (default) @ SpringExample <<<
[INFO] 
[INFO] --- hibernate3-maven-plugin:2.2:hbm2ddl (default) @ SpringExample ---
18:30:54,300  INFO org.hibernate.cfg.Environment - Hibernate 3.3.1.GA
18:30:54,304  INFO org.hibernate.cfg.Environment - hibernate.properties not found
18:30:54,306  INFO org.hibernate.cfg.Environment - Bytecode provider name : javassist
18:30:54,308  INFO org.hibernate.cfg.Environment - using JDK 1.4 java.sql.Timestamp handling
18:30:54,346  INFO org.hibernate.cfg.Configuration - configuring from url: file:/F:/workspace/SpringExample/src/main/resources/hibernate.cfg.xml
[INFO] Configuration XML file loaded: file:/F:/workspace/SpringExample/src/main/resources/hibernate.cfg.xml
18:30:54,475  INFO org.hibernate.cfg.JDBCMetaDataConfiguration - Ignoring null mapping
18:30:54,475  INFO org.hibernate.cfg.Configuration - Configured SessionFactory: null
[INFO] No hibernate properties file loaded.
18:30:54,489  INFO org.hibernate.connection.DriverManagerConnectionProvider - Using Hibernate built-in connection pool (not for production use!)
18:30:54,490  INFO org.hibernate.connection.DriverManagerConnectionProvider - Hibernate connection pool size: 20
18:30:54,490  INFO org.hibernate.connection.DriverManagerConnectionProvider - autocommit mode: false
18:30:54,495  INFO org.hibernate.connection.DriverManagerConnectionProvider - using driver: org.hsqldb.jdbcDriver at URL: jdbc:hsqldb:hsql://localhost
18:30:54,495  INFO org.hibernate.connection.DriverManagerConnectionProvider - connection properties: {user=sa}
18:30:54,685  INFO org.hibernate.cfg.SettingsFactory - RDBMS: HSQL Database Engine, version: 2.0.0
18:30:54,685  INFO org.hibernate.cfg.SettingsFactory - JDBC driver: HSQL Database Engine Driver, version: 2.0.0
18:30:54,716  INFO org.hibernate.dialect.Dialect - Using dialect: org.hibernate.dialect.HSQLDialect
18:30:54,745  INFO org.hibernate.transaction.TransactionFactoryFactory - Using default transaction strategy (direct JDBC transactions)
18:30:54,746  INFO org.hibernate.transaction.TransactionManagerLookupFactory - No TransactionManagerLookup configured (in JTA environment, use of read-write or transactional second-level cache is not recommended)
18:30:54,746  INFO org.hibernate.cfg.SettingsFactory - Automatic flush during beforeCompletion(): disabled
18:30:54,746  INFO org.hibernate.cfg.SettingsFactory - Automatic session close at end of transaction: disabled
18:30:54,746  INFO org.hibernate.cfg.SettingsFactory - JDBC batch size: 15
18:30:54,746  INFO org.hibernate.cfg.SettingsFactory - JDBC batch updates for versioned data: disabled
18:30:54,747  INFO org.hibernate.cfg.SettingsFactory - Scrollable result sets: enabled
18:30:54,747  INFO org.hibernate.cfg.SettingsFactory - JDBC3 getGeneratedKeys(): enabled
18:30:54,747  INFO org.hibernate.cfg.SettingsFactory - Connection release mode: auto
18:30:54,747  INFO org.hibernate.cfg.SettingsFactory - Default batch fetch size: 1
18:30:54,747  INFO org.hibernate.cfg.SettingsFactory - Generate SQL with comments: disabled
18:30:54,747  INFO org.hibernate.cfg.SettingsFactory - Order SQL updates by primary key: disabled
18:30:54,747  INFO org.hibernate.cfg.SettingsFactory - Order SQL inserts for batching: disabled
18:30:54,747  INFO org.hibernate.cfg.SettingsFactory - Query translator: org.hibernate.hql.ast.ASTQueryTranslatorFactory
18:30:54,748  INFO org.hibernate.hql.ast.ASTQueryTranslatorFactory - Using ASTQueryTranslatorFactory
18:30:54,749  INFO org.hibernate.cfg.SettingsFactory - Query language substitutions: {}
18:30:54,749  INFO org.hibernate.cfg.SettingsFactory - JPA-QL strict compliance: disabled
18:30:54,749  INFO org.hibernate.cfg.SettingsFactory - Second-level cache: enabled
18:30:54,749  INFO org.hibernate.cfg.SettingsFactory - Query cache: disabled
18:30:54,749  INFO org.hibernate.cfg.SettingsFactory - Cache region factory : org.hibernate.cache.impl.NoCachingRegionFactory
18:30:54,749  INFO org.hibernate.cfg.SettingsFactory - Optimize cache for minimal puts: disabled
18:30:54,749  INFO org.hibernate.cfg.SettingsFactory - Structured second-level cache entries: disabled
18:30:54,751  INFO org.hibernate.cfg.SettingsFactory - Echoing all SQL to stdout
18:30:54,752  INFO org.hibernate.cfg.SettingsFactory - Statistics: disabled
18:30:54,752  INFO org.hibernate.cfg.SettingsFactory - Deleted entity synthetic identifier rollback: disabled
18:30:54,752  INFO org.hibernate.cfg.SettingsFactory - Default entity-mode: pojo
18:30:54,753  INFO org.hibernate.cfg.SettingsFactory - Named query checking : enabled
18:30:54,765 DEBUG org.hibernate.cfg.reveng.dialect.JDBCMetaDataDialect - getTables(null.null.null)
18:30:54,767  INFO org.hibernate.connection.DriverManagerConnectionProvider - cleaning up connection pool: jdbc:hsqldb:hsql://localhost
18:30:54,773  INFO org.hibernate.dialect.Dialect - Using dialect: org.hibernate.dialect.HSQLDialect
18:30:54,777  INFO org.hibernate.tool.hbm2ddl.SchemaExport - Running hbm2ddl schema export
18:30:54,778  INFO org.hibernate.tool.hbm2ddl.SchemaExport - writing generated schema to file: F:workspaceSpringExampletargethibernate3sqlschema.sql
18:30:54,778  INFO org.hibernate.tool.hbm2ddl.SchemaExport - exporting generated schema to database
18:30:54,779  INFO org.hibernate.connection.DriverManagerConnectionProvider - Using Hibernate built-in connection pool (not for production use!)
18:30:54,779  INFO org.hibernate.connection.DriverManagerConnectionProvider - Hibernate connection pool size: 20
18:30:54,779  INFO org.hibernate.connection.DriverManagerConnectionProvider - autocommit mode: false
18:30:54,779  INFO org.hibernate.connection.DriverManagerConnectionProvider - using driver: org.hsqldb.jdbcDriver at URL: jdbc:hsqldb:hsql://localhost
18:30:54,779  INFO org.hibernate.connection.DriverManagerConnectionProvider - connection properties: {user=sa}
18:30:54,883  INFO org.hibernate.tool.hbm2ddl.SchemaExport - schema export complete
18:30:54,885  INFO org.hibernate.connection.DriverManagerConnectionProvider - cleaning up connection pool: jdbc:hsqldb:hsql://localhost
[INFO] ------------------------------------------------------------------------
[INFO] BUILD SUCCESS
[INFO] ------------------------------------------------------------------------
[INFO] Total time: 1.675s
[INFO] Finished at: Sat May 07 18:30:54 IST 2011
[INFO] Final Memory: 5M/47M
[INFO] ------------------------------------------------------------------------
18:30:54,988  INFO org.hibernate.connection.DriverManagerConnectionProvider - cleaning up connection pool: jdbc:hsqldb:hsql://localhost

Конфигурация гибернации

Мой hibernate.cfg.xml

 <?xml version="1.0" encoding="UTF-8"?>
<!DOCTYPE hibernate-configuration SYSTEM
"http://hibernate.sourceforge.net/hibernate-configuration-3.0.dtd">
<hibernate-configuration>
<session-factory>
<property name="hibernate.connection.driver_class">
org.hsqldb.jdbcDriver
</property>
<property name="hibernate.connection.url">
jdbc:hsqldb:hsql://localhost
</property>
<property name="hibernate.connection.username">
sa
</property>

<!-- <property name="hibernate.connection.username">
bceuser123
</property> -->


<property name="hibernate.dialect">
org.hibernate.dialect.HSQLDialect
</property>
<!-- Use the C3P0 connection pool provider -->
<property name="hibernate.c3p0.min_size">5</property>
<property name="hibernate.c3p0.max_size">20</property>
<property name="hibernate.c3p0.timeout">300</property>
<property name="hibernate.c3p0.max_statements">50</property>
<property name="hibernate.c3p0.idle_test_period">3000</property>
<!-- Show and print nice SQL on stdout -->
<property name="show_sql">true</property>
<property name="format_sql">true</property>
<!-- List of XML mapping files -->
<mapping resource="hello/Message.hbm.xml"/>
</session-factory>
</hibernate-configuration>

1. просто чтобы быть уверенным, вы хотите сгенерировать схему в БД или сгенерировать схему DDL?

2. Я хотел, чтобы он генерировал схему в БД. Кроме того, выходной файл F:workspaceSpringExampletargethibernate3sqlschema.sql также пуст.

Ответ №1:

Я думаю, что проблема с созданием DDL заключается в том, что он не может найти файл конфигурации гибернации. Попробуйте удалить начальную косую черту в пути в файле pom. Итак, строка должна выглядеть как:

 <configurationfile>src/main/resources/hibernate.cfg.xml</configurationfile>

Для автоматического создания базы данных добавьте следующее свойство в свой hiberante.cfg.xml

 <property name="hibernate.hbm2ddl.auto">create</property>