Question

1）Dispatcher-Servlet

<bean id="dataSource" class="org.springframework.jdbc.datasource.DriverManagerDataSource">
    <property name="driverClassName" value="${driverClassName}"/>
    <property name="url" value="${url}"/>
    <property name="username" value="${username}"/>
    <property name="password" value="${password}"/>
</bean>

<bean id="sessionFactory" class="org.springframework.orm.hibernate4.LocalSessionFactoryBean">
    <property name="dataSource" ref="dataSource"/>
    <property name="configLocation">
        <value>classpath:hibernate.cfg.xml</value>
    </property>

    <property name="hibernateProperties">
        <props>
            <prop key="hibernate.dialect">${dialect}</prop>
            <prop key="hibernate.show_sql">true</prop>
            <prop key="hibernate.default_catalog.null"></prop>       
        </props>
    </property>
</bean>

2）database.properties

driverClassName=org.postgresql.Driver
dialect=org.hibernate.dialect.PostgreSQLDialect
url=jdbc:postgresql://192.168.1.20:5432/GSW
username=postgres
password=postgres

3）Java Class

@Entity
@Table(name = "std_users_v", catalog = "GSW", schema = "public")
@NamedQueries({
@NamedQuery(name = "StdUsersV.findAll", query = "SELECT s FROM StdUsersV s")})
public class StdUsersV implements Serializable {
private static final long serialVersionUID = 1L;
@Id
@Column(name = "id")
private Integer id;
@Column(name = "user_group_id")
private BigInteger userGroupId;
@Size(max = 50)
@Column(name = "user_name", length = 50)
private String userName;
@Size(max = 100)
@Column(name = "password", length = 100)
private String password;
@Column(name = "org_unit_id")
private BigInteger orgUnitId;
@Column(name = "active_flag")
private Boolean activeFlag;
@Column(name = "start_date")
@Temporal(TemporalType.TIMESTAMP)
private Date startDate;
@Column(name = "end_date")
@Temporal(TemporalType.TIMESTAMP)
private Date endDate;
@Column(name = "created_by")
private BigInteger createdBy;
@Column(name = "creation_date")
@Temporal(TemporalType.TIMESTAMP)
private Date creationDate;
@Column(name = "updated_by")
private BigInteger updatedBy;
@Column(name = "update_date")
@Temporal(TemporalType.TIMESTAMP)
private Date updateDate;
@Size(max = 20)
@Column(name = "user_group_name", length = 20)
private String userGroupName;
getters and setters...

我正在使用Postgresql。当我试图从表StdUserV.java中获取数据时，我收到以下错误 -

org.hibernate.exception.GenericJDBCException: ERROR: cross-database references are not     implemented: "gsw.public.std_users_v"

我已经google了一下，找到了我需要从 gsw.public .std_users_v（即目录）中删除粗体文本的解决方案，但我无法理解我该怎么做。属性“hibernate.default_catalog.null”是针对这个问题的一个努力。对于这种“交叉引用”问题，我也欢迎其他解决方案。请帮忙。

Answer 1

更改后找到解决方案 -

@Table(name = "std_users_v", catalog = "GSW", schema = "public")

到 -

@Table(name = "std_users_v")

Answer 2

我使用Postgres的Spring Boot遇到了同样的问题。我发现你只需要删除Table.catalog属性。如果你的Postgres数据库中有多个模式，那么我建议你保留模式属性。

这会导致查询使用模式作为前缀，如：

Hibernate：从public.std_users_v中选择count（*）作为col_0_0_

如果您不删除目录属性，则最终会：

Hibernate：从GSW.public.std_users_v中选择count（*）作为col_0_0_

错误：未实现跨数据库引用：＆＃34; GSW.public.std_users_v＆＃34;

org.hibernate.exception.GenericJDBCException：错误：未实现跨数据库引用

2 个答案: