使用PreparedStatement将blob设置为null

Question

我正在使用JSF2.0创建webapplication,在mysql中,我使用数据类型存储图像MEDIUMBLOB.

要插入值,我使用PreparedStatement,如下所示.

PreparedStatement psmnt = con.prepareStatement("INSERT INTO sketchesSG002003 (userid, imageTitle, imageData, drawingComments) VALUES (?,?,?,?)");
psmnt.setLong(1, personalInfoId);
psmnt.setString(2, sketchesSG002003Title);

try {
    String fileName = FilenameUtils.getName(sketchesSG002003ImageUpload.getName());
    File image = new File(fileName);
    InputStream fis = sketchesSG002003ImageUpload.getInputStream();
    psmnt.setBinaryStream(3, fis, (int) sketchesSG002003ImageUpload.getSize());
} catch (Exception e) {
    psmnt.setBinaryStream(3, null);
}
psmnt.setString(4, sketchesSG002003Comments);
i = psmnt.executeUpdate();

但是我收到了错误

java.lang.AbstractMethodError: com.mysql.jdbc.PreparedStatement.setBinaryStream(ILjava/io/InputStream;)V

Stacktrace的某些部分是

 javax.faces.el.EvaluationException: java.lang.AbstractMethodError: com.mysql.jdbc.PreparedStatement.setBinaryStream(ILjava/io/InputStream;)V
at javax.faces.component.MethodBindingMethodExpressionAdapter.invoke(MethodBindingMethodExpressionAdapter.java:102)
at com.sun.faces.application.ActionListenerImpl.processAction(ActionListenerImpl.java:102)
at javax.faces.component.UICommand.broadcast(UICommand.java:315)
at javax.faces.component.UIViewRoot.broadcastEvents(UIViewRoot.java:794)
at javax.faces.component.UIViewRoot.processApplication(UIViewRoot.java:1259)
at com.sun.faces.lifecycle.InvokeApplicationPhase.execute(InvokeApplicationPhase.java:81)

我认为上面的错误是声明 psmnt.setBinaryStream(3, null);

我的问题是如何将二进制数据设置为Null或Nothing？

Answer 1

这几天出了什么问题？我问问题后得到解决方案:(

psmnt.setNull(3, java.sql.Types.BLOB); 做了伎俩.