使用PreparedStatement将blob设置为null [英] setting blob to null using PreparedStatement

问题描述

我正在使用JSF2.0创建Web应用程序，其中在mysql中，我使用数据类型为MEDIUMBLOB来存储图像.

I am creating webapplication using JSF2.0 where in mysql, I am storing images using datatype as MEDIUMBLOB.

要插入值，我正在使用PreparedStatement，如下所示.

To insert values, I am using PreparedStatement as shown below.

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();

但是我遇到错误

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

Stacktrace的某些部分是

Some part of Stacktrace is

 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)

我认为上述错误是针对语句psmnt.setBinaryStream(3, null);

I believe above error is for statement psmnt.setBinaryStream(3, null);

我的问题是如何将二进制数据设置为Null或Nothing?

推荐答案

这几天出了什么问题?我问了问题后就得到了解决方法:(

What is going wrong these days? I get solution after I ask question :(

psmnt.setNull(3, java.sql.Types.BLOB);做到了.

这篇关于使用PreparedStatement将blob设置为null的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！