内部异常：java.sql.SQLSyntaxErrorException：user缺少未找到的权限或对象：SEQUENCE但我使用MySQL

Question

我是J2EE的新手。我想将一个对象持久化到我的MySQL数据库，但该异常与HyperSQL有关。

这是我的persistence.xml文件

<?xml version="1.0" encoding="UTF-8"?>

<persistence-unit name="learnPU">
        <properties>
            <property name="javax.persistence.jdbc.url" value="jdbc:mysql://localhost/learndb" />
            <property name="javax.persistence.jdbc.user" value="root" />
            <property name="javax.persistence.jdbc.password" value="xxxxx" />
            <property name="javax.persistence.jdbc.driver" value="com.mysql.jdbc.Driver" />
            <property name="hibernate.show_sql" value="true" />
            <property name="hibernate.format_sql" value="true" />
            <property name="hibernate.hbm2ddl.auto" value="validate" />
        </properties>
</persistence-unit>

和我的pom文件的依赖关系

 <dependencies>
    <dependency>
        <groupId>javax</groupId>
        <artifactId>javaee-web-api</artifactId>
        <version>7.0</version>
        <scope>compile</scope>
    </dependency>
    <dependency>
        <groupId>org.hibernate</groupId>
        <artifactId>hibernate-entitymanager</artifactId>
        <version>5.2.12.Final</version>
        <type>pom</type>
    </dependency>
    <dependency>
        <groupId>mysql</groupId>
        <artifactId>mysql-connector-java</artifactId>
        <version>6.0.6</version>
    </dependency>
</dependencies>

我永远不会声明HyperSQL连接。

这是堆栈跟踪

Caused by: org.hsqldb.HsqlException: user lacks privilege or object not found: SEQUENCE
at org.hsqldb.error.Error.error(Unknown Source)
at org.hsqldb.error.Error.error(Unknown Source)
at org.hsqldb.SchemaManager.getTable(Unknown Source)
at org.hsqldb.ParserDQL.readTableName(Unknown Source)
at org.hsqldb.ParserDQL.readRangeVariableForDataChange(Unknown Source)
at org.hsqldb.ParserDML.compileUpdateStatement(Unknown Source)
at org.hsqldb.ParserCommand.compilePart(Unknown Source)
at org.hsqldb.ParserCommand.compileStatement(Unknown Source)
at org.hsqldb.Session.compileStatement(Unknown Source)
at org.hsqldb.StatementManager.compile(Unknown Source)
at org.hsqldb.Session.execute(Unknown Source)
... 127 more

Answer 1

您似乎必须在应用程序服务器的管理面板/配置文件（取决于您的应用程序服务器）中定义数据源。

所以在我的情况下，TomEE，您必须在tomeedir / conf / tomee.xml中执行此操作

  <Resource id="learnDB" type="DataSource">
    JdbcDriver com.mysql.jdbc.Driver
    JdbcUrl jdbc:mysql://localhost:3306/learndb
    UserName root
    Password *****
    JtaManaged true
  </Resource>

并将数据库的库jar文件放在de / lib文件夹中。

在persistence.xml文件中，您可以定义jta-data-source。这是您的资源ID的名称。

 <persistence-unit name="learnPU">
        <jta-data-source>learnDB</jta-data-source>
        <exclude-unlisted-classes>false</exclude-unlisted-classes>
        <properties>
            <property name="javax.persistence.schema-generation.database.action" value="drop-and-create"/>
        </properties>
    </persistence-unit>