我试图从文件中删除单引号和双引号.我可以在一个sed命令中执行此操作吗?
我在尝试 :
sed 's/\"//g;s/\'//g' txt file
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但得到这个错误
'''是无与伦比的.
请帮忙.
我正在使用Cassandra 1.2.5.在使用cassandra-cli在Cassandra中创建列族之后,是否可以使用cassandra-cli或CQL修改列族的主键?
具体来说,我目前有下表(来自CQL):
CREATE TABLE "table1" (
key blob,
column1 blob,
value blob,
PRIMARY KEY (key, column1)
);
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我希望该表如下,而不必删除并重新创建表:
CREATE TABLE "table1" (
key blob,
column1 blob,
value blob,
PRIMARY KEY (key)
);
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这可能通过cassandra-cli或CQL实现吗?
我遇到的情况是我在一个元素上有多个变换,所以我的问题是如何在保持命名变换的同时将其转换为Compass:
-webkit-transform:translateY(-100%)scale(0.5);
-moz-transform:translateY(-100%)scale(0.5);
transform:translateY(-100%)scale(0.5);
-ms-transform:translateY(-100%)scale(0.5);
就像是 : @include translateY(-100%) scale(0.5);
谢谢.
我有一个包含多列的表.我希望单独选择每列的内容.当我开始选择第一列时,第二,第三......将自动被选中.当我选择一列时,我想让其他列不可选.
我尝试在元素上应用以下类,它在FF中运行良好.无论你从哪里开始选择,它都永远不可选择.
.unselectable {
user-select: none; /* CSS3 */
-moz-user-select: none;
-khtml-user-select: none;
}
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对于IE,我尝试了一个名为" unselectable="on"Internet Explorer"的属性,如果选择从外部开始,它仍然可以选择.我想阻止选择某些列,甚至选择从外部开始.
我尝试过使用onselectionstart和onmouseover,但是当选择在元素之外开始时,这些不会被触发.
我有什么希望吗?
提前致谢.
1-我安装了gem bootstrap_form
2-我在application.css中写*= require bootstrap_form before the */
了我的html.erb中的第3 行
<%= bootstrap_form_for(@guardian, :url => student_guardians_path(@student),
html: { class: 'form-horizontal' },
method: :post) do |f| %>
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我收到以下错误:undefined methodbootstrap_form_for'for#<#:0xb31a80c>`
我试过这个:
$("#typeahead_object").val("test");
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它只更改文本框值,但不触发typeahead的'updater'功能.
问题:如何手动设置预先输入对象的值并触发其更新程序功能?
关系:
Item belongs to Product
Product belongs to User
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项目范围:
scope :search, ->(search_term) {
select('products.name, users.*, products.brand, COUNT(products.id)')
.joins(:product => :user)
.where('users.name = ? OR products.brand = ?', search_term, search_term)
.group('products.id')
}
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以上结果在以下SQL语句中:
SELECT products.name, users.*, products.brand, COUNT(products.id) FROM "items"
INNER JOIN "products" ON "products"."id" = "items"."product_id"
INNER JOIN "users" ON "users"."id" = "products"."user_id"
WHERE (users.name = 'Atsuete Lipstick' OR products.brand = 'Atsuete Lipstick')
GROUP BY products.id
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这里的问题是发生错误:
ActiveRecord::StatementInvalid: PG::Error: ERROR: column "users.id"
must appear in the GROUP BY clause …Run Code Online (Sandbox Code Playgroud) 我在google搜索时找到了以下代码.
int main()
{
int a=10;
switch(a)
{
case '1':
printf("ONE\n");
break;
case '2':
printf("TWO\n");
break;
defa1ut:
printf("NONE\n");
}
return 0;
}
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即使'default'被任何其他名称替换,编译器也不会给出错误.它只是执行程序并退出程序而不打印任何东西.
有人请告诉我为什么编译器没有在默认情况下给出错误?什么时候拼写不是'默认'?
给定一个ZipCodeInfos表,包含字段zipcode,state,city(所有字符串),其中zipcode是唯一的:
zipcode,city,state
"10000", "Fooville", "AA"
"10001", "Smallville", "AA"
"10002", "Whoville", "BB"
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生成整个表的哈希对象的最快方法是什么,其中zipcode是这样的键:
{ "10000" => {:city => "Fooville", :state => "AA" },
"10001" => {:city => "Smallville", :state => "AA" },
"10002" => {:city => "Whoville", :state => "BB" } }
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我知道对于给定的记录,我可以使用.attributes生成一个带有键,值对的字段名,字段值的哈希,例如Zipcode.first.attributes给我
{"id" => 1, "zipcode" => "10000", "city" => "Fooville", "state => "AA" }
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但是,如果没有蛮力迭代每条记录(通过.map),我就无法弄清楚如何使用zipcode创建所需的哈希值作为哈希每个节点的关键.
这是我能想到的最好的,我怀疑有一些漂亮的Ruby优点更快?
zip_info_hash = {}
ZipCodeInfo.all.map{|x| zip_info_hash[x.zip] =
{'state' => x.state, 'city' => x.city }}
Run Code Online (Sandbox Code Playgroud) 我是CI和Jenkins的新手.
我正在将git项目(https://github.com/jenkinsci/git-plugin)导入我的日食,但我收到的错误是:
"Project build error: Non-resolvable parent POM: Failure to transfer
org.jenkins-ci.plugins:plugin:pom:1.480 from http//download.eclipse.org/jgit/maven
was cached in the local repository,
resolution will not be reattempted until the update interval of jgit-repository
has elapsed or updates are forced. Original error: Could not transfer artifact
org.jenkins-ci.plugins:plugin:pom:1.480 from/to jgit-repository
(http//download.eclipse.org/jgit/maven): null to
http://download.eclipse.org/jgit/maven/org/jenkins-ci/plugins/plugin/1.480/plugin-
1.480.pom and 'parent.relativePath' points at wrong local POM"
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