我正在使用 JSF2.0 创建 web 应用程序,在 mysql 中,我使用数据类型将图像存储为MEDIUMBLOB
.
要插入值,我使用的是 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)
我相信上面的错误是为了声明psmnt.setBinaryStream(3, null);
我的问题是如何将二进制数据设置为 Null 或 Nothing?