小编Man*_*noj的帖子

当我尝试运行alter table命令删除列时,我收到此错误:ERROR 1025(HY000):重命名时出错......(错误号:150).

如果我理解正确,这是一个外键问题,但我不知道如何解决它.有人会这么善良并告诉我如何让它发挥作用.

用于创建表的代码:

CREATE TABLE categories(
cid INT AUTO_INCREMENT NOT NULL PRIMARY KEY,
assets_id INT NOT NULL,
cat_name VARCHAR(30) NOT NULL,
INDEX(assets_id),
FOREIGN KEY (assets_id) REFERENCES asset(aid) ON UPDATE CASCADE

)
ENGINE=INNODB DEFAULT CHARSET=utf8;

alter命令:

ALTER TABLE categories DROP COLUMN assets_id;

表类别完全空白.因此,没有信息可以引发CASCADE限制.那么你能帮助我删除列assets_id需要什么样的魔法.谢谢.

我有使用java配置方法配置Spring安全性的Spring Web应用程序.我想从身份验证中排除一些URL模式(例如:静态资源等).我之前使用spring security xml config做了这个,但是无法弄清楚java配置,因为添加antmatchers没有帮助.

以下是我在扩展WebSecurityConfigurerAdapter的安全配置类中添加的代码

@Override
public void configure(HttpSecurity http) throws Exception {
    http.authorizeRequests()
            .antMatchers("/authFailure")
            .permitAll()
            .anyRequest()
            .authenticated()
            .and()
            .httpBasic()
            .and()
            .authenticationProvider(_provider)
            .sessionManagement()
            .sessionCreationPolicy(SessionCreationPolicy.STATELESS)
            .and()
            .addFilter(authFilter())
            .addFilterAfter(executionContextFilter(),
                    TokenBasedSecurityFilter.class).csrf().disable();
}

我使用的弹簧安全版本是3.2.0.在此先感谢您的帮助

编辑:

我在点击排除的网址时得到的堆栈跟踪,

org.springframework.security.authentication.AuthenticationServiceException: Authorization Header is not available in the request
    at com.inventory.ricemill.tba.spring.TokenBasedSecurityFilter.doFilter(TokenBasedSecurityFilter.java:59)
    at org.springframework.security.web.FilterChainProxy$VirtualFilterChain.doFilter(FilterChainProxy.java:342)
    at org.springframework.security.web.authentication.logout.LogoutFilter.doFilter(LogoutFilter.java:110)
    at org.springframework.security.web.FilterChainProxy$VirtualFilterChain.doFilter(FilterChainProxy.java:342)
    at org.springframework.security.web.header.HeaderWriterFilter.doFilterInternal(HeaderWriterFilter.java:57)
    at org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:107)
    at org.springframework.security.web.FilterChainProxy$VirtualFilterChain.doFilter(FilterChainProxy.java:342)
    at org.springframework.security.web.context.SecurityContextPersistenceFilter.doFilter(SecurityContextPersistenceFilter.java:87)
    at org.springframework.security.web.FilterChainProxy$VirtualFilterChain.doFilter(FilterChainProxy.java:342)
    at org.springframework.security.web.context.request.async.WebAsyncManagerIntegrationFilter.doFilterInternal(WebAsyncManagerIntegrationFilter.java:50)
    at org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:107)
    at org.springframework.security.web.FilterChainProxy$VirtualFilterChain.doFilter(FilterChainProxy.java:342)
    at org.springframework.security.web.FilterChainProxy.doFilterInternal(FilterChainProxy.java:192)
    at org.springframework.security.web.FilterChainProxy.doFilter(FilterChainProxy.java:160)
    at org.springframework.web.filter.DelegatingFilterProxy.invokeDelegate(DelegatingFilterProxy.java:343)
    at org.springframework.web.filter.DelegatingFilterProxy.doFilter(DelegatingFilterProxy.java:260)
    at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:243)
    at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:210)
    at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:222) …

我创建了一个类并重写了equals()方法.当我使用时assertTrue(obj1.equals(obj2)),它将通过测试; 但是,assertEquals(obj1, obj2)测试将失败.有人可以告诉原因吗？

据我所知跳过测试用例最简单的方法是删除@Test注释,但是在大量测试用例中执行它是很麻烦的.我想知道JUnit中是否有任何注释可以有条件地关闭一些测试用例.

这两者有何不同？

from(endpoint).to(endpoint:a, endpoint:b)

from(endpoint).multicast().to(endpoint:a, endpoint:b)

找不到第一个的任何文档

我正在使用这个选择器 $("textarea #myTextArea").val(text);,它不起作用.如果我删除了ID并使用它正在运行的类.为什么jquery不能在这里找到元素？

我xjc在Maven环境中使用插件并尝试从Schema生成类我可以使用xjc从命令行执行此操作(创建类),但无法使用maven target generate-sources执行相同操作.
获得以下异常

[ERROR] null[5,30]
org.xml.sax.SAXParseException: A class/interface with the same name "<className>" is already in use. Use a class customization
to resolve this conflict.
        at com.sun.tools.xjc.util.CodeModelClassFactory.createClass(CodeModelClassFactory.java:100)
        at com.sun.tools.xjc.util.CodeModelClassFactory.createClass(CodeModelClassFactory.java:61)
        at com.sun.tools.xjc.generator.bean.ImplStructureStrategy$1.createClasses(ImplStructureStrategy.java:42)
        at com.sun.tools.xjc.generator.bean.BeanGenerator.generateClassDef(BeanGenerator.java:371)
        at com.sun.tools.xjc.generator.bean.BeanGenerator.getClazz(BeanGenerator.java:403)
        at com.sun.tools.xjc.generator.bean.BeanGenerator$1.onBean(BeanGenerator.java:291)
        at com.sun.tools.xjc.generator.bean.BeanGenerator$1.onBean(BeanGenerator.java:299)
        at com.sun.tools.xjc.model.CClassInfo.accept(CClassInfo.java:352)
        at com.sun.tools.xjc.generator.bean.BeanGenerator.getContainer(BeanGenerator.java:281)
        at com.sun.tools.xjc.generator.bean.BeanGenerator.getUsedPackages(BeanGenerator.java:337)
        at com.sun.tools.xjc.generator.bean.BeanGenerator.<init>(BeanGenerator.java:169)
        at com.sun.tools.xjc.generator.bean.BeanGenerator.generate(BeanGenerator.java:151)
        at com.sun.tools.xjc.model.Model.generateCode(Model.java:230)
        at com.sun.tools.xjc.Driver.run(Driver.java:317)
        at org.codehaus.mojo.jaxb2.XjcMojo.execute(XjcMojo.java:301)
        at org.apache.maven.plugin.DefaultPluginManager.executeMojo(DefaultPluginManager.java:490)
        at org.apache.maven.lifecycle.DefaultLifecycleExecutor.executeGoals(DefaultLifecycleExecutor.java:694)
        at org.apache.maven.lifecycle.DefaultLifecycleExecutor.executeGoalWithLifecycle(DefaultLifecycleExecutor.java:556)
        at org.apache.maven.lifecycle.DefaultLifecycleExecutor.executeGoal(DefaultLifecycleExecutor.java:535)
        at org.apache.maven.lifecycle.DefaultLifecycleExecutor.executeGoalAndHandleFailures(DefaultLifecycleExecutor.java:387)
        at org.apache.maven.lifecycle.DefaultLifecycleExecutor.executeTaskSegments(DefaultLifecycleExecutor.java:348)
        at org.apache.maven.lifecycle.DefaultLifecycleExecutor.execute(DefaultLifecycleExecutor.java:180)
        at org.apache.maven.DefaultMaven.doExecute(DefaultMaven.java:328)
        at org.apache.maven.DefaultMaven.execute(DefaultMaven.java:138)
        at org.apache.maven.cli.MavenCli.main(MavenCli.java:362)
        at org.apache.maven.cli.compat.CompatibleMain.main(CompatibleMain.java:60) …

我正在尝试超过2天来实现文本编辑器窗口的特定要求...不幸的是到目前为止没有成功:(

目标是获得一个文本编辑器窗口,该窗口将突出显示当前行,就像其他文本编辑器一样.对于当前行,我指的是当前光标/插入符所在的行.

我已经找到了两种不同的方法,但不幸的是我无法采用它们,所以它们按预期工作.

第一种方法是覆盖DefaultHighlighter(http://snippets.dzone.com/posts/show/6688).在第二种方法中,HighlighterPainter将被覆盖(http://www.jroller.com/santhosh/date/20050622).

现在我正在尝试在我的项目中采用第一种方法,但正如我所说,它没有按预期工作.

在这篇文章的最后,我发布了一个小样本应用程序来演示这个问题.

• 如果我启动程序,则将插入符号放在第一行的开头.但是,该行未突出显示.
• 现在我输入一些字符.这些字符将突出显示,但只有那些字符不完整
• 我点击Enter进入下一行.第一行不再突出显示正确的内容.第二行也没有突出显示,这是不正确的.再次,当我键入一些字符时,那些将是高亮显示但不是完整的行.
• 当我现在将插入符号移回第一行时,通过向上键或鼠标单击,将突出显示完整的第一行,而不仅仅是现有的字符.这是我从一开始就想要的行为.

我希望有人能告诉我这里我做错了什么......或者解释为什么根本无法解决这个问题.如何实现线条突出显示的任何替代解决方案也非常感谢!

非常感谢Cheers Preachie

import java.awt.Color;
import java.awt.Dimension;
import java.awt.Graphics;
import java.awt.Insets;
import java.awt.Rectangle;

import javax.swing.JFrame;
import javax.swing.JTextPane;
import javax.swing.event.CaretEvent;
import javax.swing.event.CaretListener;
import javax.swing.text.DefaultHighlighter;
import javax.swing.text.Highlighter;
import javax.swing.text.JTextComponent;

public class HighlightProblem extends JFrame {
    private static final long serialVersionUID = 1L;
    private final JTextPane textPane;
    private final Highlighter.HighlightPainter cyanPainter;

    public HighlightProblem() {
        cyanPainter = new DefaultHighlighter.DefaultHighlightPainter(Color.CYAN);

        textPane = new JTextPane();
        textPane.setPreferredSize(new …

我有一个jcombobox,其值来自列表.我想从下拉列表中首先看到空白.我接近它的方法是首先将列表类型的新对象放在第一位,如示例所示:

 final List<Object> list = getObjectsList();
  list.add(new Object()); 

但这会导致空指针,如果这样做

list.add(null);

这解决了这个问题,但后来又用Comparator方法给了我另一个问题.所以任何一轮工作都会非常感谢.

我正在尝试手动运行预定作业,这个工作看起来像这样

  DBMS_SCHEDULER.CREATE_JOB (
   job_name           =>  'UPDATE_PLAYER_STATES',
   job_type           =>  'STORED_PROCEDURE',
   job_action         =>  'PLAYER_STATE_UPDATER',
   repeat_interval    =>  'FREQ=DAILY;BYHOUR=0', /* every day at Midnight */
   job_class          =>  'DEFAULT_JOB_CLASS',
   enabled            =>  true,
   auto_drop          =>  false);

现在,当我使用运行程序时,execute PLAYER_STATE_UPDATER我可以看到所需的结果,但是作业无法执行,如图所示

select log_date, job_name, status, run_duration
from dba_scheduler_job_run_details where job_name='UPDATE_PLAYER_STATES' or status='FAILED';


    LOG_DATE                    JOB_NAME        STATUS   RUN_DURATION 
------------- -----------------------------------------------------------------
23-AUG-11 00.20.24.288887000 +01:00 UPDATE_PLAYER_STATES    FAILED    0 0:0:0.0    
22-AUG-11 10.27.24.537659000 +01:00 UPDATE_PLAYER_STATES    FAILED    0 0:0:0.0    
22-AUG-11 10.28.50.447042000 +01:00 UPDATE_PLAYER_STATES    FAILED    0 0:0:0.0    
22-AUG-11 10.30.30.018891000 +01:00 UPDATE_PLAYER_STATES    FAILED    0 0:0:0.0    
25-AUG-11 …