Question

我是ElcipseLink和JPA的新手。我已经成功设置了persistence.xml和EclipseLink库。但是，当尝试从服务器检索数据时，我得到无效的对象名称：dbo.Material。

我的值存储在leermiddelen数据库中。该计划是dbo，表格是材料。当我尝试指定目录名称（leermiddelen）时，我收到一条错误，指出Azure中不支持指定数据库名称。

一点帮助？（顺便说一句，当手动连接连接字符串和来自Microsoft的驱动程序时，它确实有效）

<?xml version="1.0" encoding="UTF-8"?>
<persistence xmlns="http://java.sun.com/xml/ns/persistence" version="2.0">
<persistence-unit name="test" transaction-type="RESOURCE_LOCAL">
    <provider>org.eclipse.persistence.jpa.PersistenceProvider</provider>
    <exclude-unlisted-classes>true</exclude-unlisted-classes>
    <class>models.Material</class>
    <properties>
        <property name="javax.persistence.jdbc.driver" value="com.microsoft.sqlserver.jdbc.SQLServerDriver"/>
        <property name="javax.persistence.jdbc.url"
                  value="xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx"/>
        <property name="javax.persistence.jdbc.user" value="xxxxxxxxxxxx"/>
        <property name="javax.persistence.jdbc.password" value="xxxxxxxxxx"/>
    </properties>
</persistence-unit>

和java代码：

EntityManagerFactory entityManagerFactory = Persistence.createEntityManagerFactory("test");
    EntityManager entityManager = entityManagerFactory.createEntityManager();
    EntityTransaction userTransaction = entityManager.getTransaction();
    try {
        userTransaction.begin();
        @SuppressWarnings("unchecked")
        List<Material> materials = entityManager.createQuery("SELECT e from Material e").getResultList();
        System.out.println("Getting materials list...");
        for (Iterator<Material> iterator = materials.iterator(); iterator.hasNext(); ) {
            Material m = (Material) iterator.next();
            System.out.println(m.toString());
        }
        entityManager.getTransaction().commit();
    } catch (Exception e) {
        entityManager.getTransaction().rollback();
    }
    entityManager.close();
    entityManagerFactory.close();
}

最后是错误：

[EL Warning]: 2016-04-05 11:16:13.426--UnitOfWork(1690796457)--Exception        [EclipseLink-4002] (Eclipse Persistence Services - 2.6.2.v20151217-774c696):  org.eclipse.persistence.exceptions.DatabaseException
 Internal Exception: com.microsoft.sqlserver.jdbc.SQLServerException: Invalid object name 'dbo.Material'.
Error Code: 208
Call: SELECT Number, Amount, CanReserve, Description, Firm, IsAvailable, Name, PhotoUrl, Price FROM dbo.Material

Answer 1

问题的结论。似乎问题是由不正确的jdbc url引起的。 Azure SQL数据库的jdbc URL如下所示。

jdbc:sqlserver://<hostname>.database.windows.net:1433;database=<database-name>;user=<username>@<hostname>;password={your_password_here};encrypt=true;hostNameInCertificate=*.database.windows.net;loginTimeout=30;

要获取Azure门户上的连接字符串，请参阅https://azure.microsoft.com/en-us/documentation/articles/sql-database-develop-java-simple-windows/#step-4-get-connection-string。

使用Eclipselink指定数据库名称到SQLServer db？

1 个答案: