如何处理 olingo v2 中的 BLOB 和 CLOB?
How to handle BLOB and CLOB in olingo v2?
Here olingo jpa 中有关于如何处理 BLOB 和 CLOB 的伪代码。我将所需的导入添加到伪代码中:
package me;
import java.sql.Blob;
import java.sql.Clob;
import java.sql.SQLException;
import javax.sql.rowset.serial.SerialException;
import org.apache.olingo.odata2.jpa.processor.api.OnJPAWriteContent;
import org.apache.olingo.odata2.jpa.processor.api.exception.ODataJPARuntimeException;
public class OnDBWriteContent implements OnJPAWriteContent {
@Override
public Blob getJPABlob(byte[] binaryData) throws ODataJPARuntimeException {
try {
return new JDBCBlob(binaryData);
} catch (SerialException e) {
ODataJPARuntimeException.throwException(ODataJPARuntimeException.INNER_EXCEPTION, e);
} catch (SQLException e) {
ODataJPARuntimeException.throwException(ODataJPARuntimeException.INNER_EXCEPTION, e);
}
return null;
}
@Override
public Clob getJPAClob(char[] characterData) throws ODataJPARuntimeException {
try {
return new JDBCClob(new String(characterData));
} catch (SQLException e) {
ODataJPARuntimeException.throwException(ODataJPARuntimeException.INNER_EXCEPTION, e);
}
return null;
}
}
唯一的问题是我找不到 JDBCBlob
和 JDBCClob
的任何实现。关于如何实施它们或使用一些 类?
的任何建议
如果您使用的是 MySQL,则需要额外的 ExceptionInterceptor
以及 Blob 实现。您可以自定义实现 ExceptionInterceptor
并使用它来初始化 Blob 字段。
实现的代码如下
import java.sql.Blob;
import java.sql.Clob;
import java.util.Properties;
import org.apache.olingo.odata2.jpa.processor.api.OnJPAWriteContent;
import org.apache.olingo.odata2.jpa.processor.api.exception.ODataJPARuntimeException;
import com.mysql.cj.exceptions.ExceptionInterceptor;
import com.mysql.cj.log.Log;
public class CustomOnJPAWriteContent implements OnJPAWriteContent {
@Override
public Blob getJPABlob(byte[] binaryData) throws ODataJPARuntimeException {
return new com.mysql.cj.jdbc.Blob(binaryData, exceptionInterceptor);
}
@Override
public Clob getJPAClob(char[] characterData) throws ODataJPARuntimeException {
return new com.mysql.cj.jdbc.Clob(new String(characterData), exceptionInterceptor);
}
ExceptionInterceptor exceptionInterceptor = new ExceptionInterceptor() {
@Override
public Exception interceptException(Exception sqlEx) {
// TODO Auto-generated method stub
return null;
}
@Override
public ExceptionInterceptor init(Properties props, Log log) {
// TODO Auto-generated method stub
return null;
}
@Override
public void destroy() {
// TODO Auto-generated method stub
}
};
}
Here olingo jpa 中有关于如何处理 BLOB 和 CLOB 的伪代码。我将所需的导入添加到伪代码中:
package me;
import java.sql.Blob;
import java.sql.Clob;
import java.sql.SQLException;
import javax.sql.rowset.serial.SerialException;
import org.apache.olingo.odata2.jpa.processor.api.OnJPAWriteContent;
import org.apache.olingo.odata2.jpa.processor.api.exception.ODataJPARuntimeException;
public class OnDBWriteContent implements OnJPAWriteContent {
@Override
public Blob getJPABlob(byte[] binaryData) throws ODataJPARuntimeException {
try {
return new JDBCBlob(binaryData);
} catch (SerialException e) {
ODataJPARuntimeException.throwException(ODataJPARuntimeException.INNER_EXCEPTION, e);
} catch (SQLException e) {
ODataJPARuntimeException.throwException(ODataJPARuntimeException.INNER_EXCEPTION, e);
}
return null;
}
@Override
public Clob getJPAClob(char[] characterData) throws ODataJPARuntimeException {
try {
return new JDBCClob(new String(characterData));
} catch (SQLException e) {
ODataJPARuntimeException.throwException(ODataJPARuntimeException.INNER_EXCEPTION, e);
}
return null;
}
}
唯一的问题是我找不到 JDBCBlob
和 JDBCClob
的任何实现。关于如何实施它们或使用一些 类?
如果您使用的是 MySQL,则需要额外的 ExceptionInterceptor
以及 Blob 实现。您可以自定义实现 ExceptionInterceptor
并使用它来初始化 Blob 字段。
实现的代码如下
import java.sql.Blob;
import java.sql.Clob;
import java.util.Properties;
import org.apache.olingo.odata2.jpa.processor.api.OnJPAWriteContent;
import org.apache.olingo.odata2.jpa.processor.api.exception.ODataJPARuntimeException;
import com.mysql.cj.exceptions.ExceptionInterceptor;
import com.mysql.cj.log.Log;
public class CustomOnJPAWriteContent implements OnJPAWriteContent {
@Override
public Blob getJPABlob(byte[] binaryData) throws ODataJPARuntimeException {
return new com.mysql.cj.jdbc.Blob(binaryData, exceptionInterceptor);
}
@Override
public Clob getJPAClob(char[] characterData) throws ODataJPARuntimeException {
return new com.mysql.cj.jdbc.Clob(new String(characterData), exceptionInterceptor);
}
ExceptionInterceptor exceptionInterceptor = new ExceptionInterceptor() {
@Override
public Exception interceptException(Exception sqlEx) {
// TODO Auto-generated method stub
return null;
}
@Override
public ExceptionInterceptor init(Properties props, Log log) {
// TODO Auto-generated method stub
return null;
}
@Override
public void destroy() {
// TODO Auto-generated method stub
}
};
}