Question

我正在尝试使用Hibernate将pdf文档保存到我的postgres 10.1数据库中。下面是我的实体类。

@Entity
@Table(name = "FILEUPLOADS", schema="SomeSchema")
public class FileUploads{
//skipping other columns

@Lob
@Column(name="DOCDATA")
private byte[] docData;

}

此列是postgres数据库中的操作类型 bytea 。

如Authur在这里建议的那样：similar issue，我创建了如下的postgres方言的自定义实现。

@Configuration
public class TestDialect extends PostgreSQLDialect{
    public TestDialect() {
        super();

        registerColumnType(Types.BLOB, "bytea");
    }

}

然后在我的persistence.xml文件中，我正在使用此自定义方言

<property name="hibernate.dialect" value="com.digital.repository.TestDialect" />

即使完成所有这些操作，我仍会遇到错误

ERROR: column "DOCDATA" is of type bytea but expression is of type bigint
  Hint: You will need to rewrite or cast the expression.
  Position: 251
        at org.postgresql.core.v3.QueryExecutorImpl.receiveErrorResponse(QueryExecutorImpl.java:2468)
        at org.postgresql.core.v3.QueryExecutorImpl.processResults(QueryExecutorImpl.java:2211)
        at org.postgresql.core.v3.QueryExecutorImpl.execute(QueryExecutorImpl.java:309)
        at org.postgresql.jdbc.PgStatement.executeInternal(PgStatement.java:446)
        at org.postgresql.jdbc.PgStatement.execute(PgStatement.java:370)
        at org.postgresql.jdbc.PgPreparedStatement.executeWithFlags(PgPreparedStatement.java:149)
        at org.postgresql.jdbc.PgPreparedStatement.executeUpdate(PgPreparedStatement.java:124)
        at org.apache.tomcat.dbcp.dbcp.DelegatingPreparedStatement.executeUpdate(DelegatingPreparedStatement.java:105)
        at org.apache.tomcat.dbcp.dbcp.DelegatingPreparedStatement.executeUpdate(DelegatingPreparedStatement.java:105)
        at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
        at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:57)
        at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
        at java.lang.reflect.Method.invoke(Method.java:606)
        at org.hibernate.engine.jdbc.internal.proxy.AbstractStatementProxyHandler.continueInvocation(AbstractStatementProxyHandler.java:122)
        ... 250 more

要解决此问题，我还需要做什么？

Answer 1

尝试更改休眠类型：

@Entity
@Table(name = "FILEUPLOADS", schema="SomeSchema")
public class FileUploads{
//skipping other columns

@Type(type = "org.hibernate.type.BinaryType")
@Column(name="DOCDATA")
private byte[] docData;

}

Answer 2

下面的配置对我有用，现在我可以将doc / pdf保存到数据库中。

@Configuration
public class CustomPostgresDialect extends PostgreSQL82Dialect{

    @Override
    public SqlTypeDescriptor remapSqlTypeDescriptor(SqlTypeDescriptor sqlTypeDescriptor) {
    if (sqlTypeDescriptor.getSqlType() == java.sql.Types.BLOB) {
      return BinaryTypeDescriptor.INSTANCE;
    }
    return super.remapSqlTypeDescriptor(sqlTypeDescriptor);
  }
}

休眠4.1.10

Java 1.7

将pdf上载到Postgres的问题

2 个答案: