大约有 5,883 项符合查询结果(耗时:0.0254秒) [XML]

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how to split the ng-repeat data with three columns using bootstrap

...ays sees the return value as different from the previous. To fix these "unstable" filters, you must wrap the filter in a memoize function. lodash has a memoize function and the latest version of lodash also includes a chunk function, so we can create this filter very simply using npm modules and com...
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Give all the permissions to a user on a DB

... -- ... system schemas ); END $$; Then, all permissions for all tables (requires Postgres 9.0 or later). And don't forget sequences (if any): GRANT ALL PRIVILEGES ON ALL TABLES IN SCHEMA public TO my_user; GRANT ALL PRIVILEGES ON ALL SEQUENCES IN SCHEMA public TO my_user; For older ver...
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How can i use iptables on centos 7? [closed]

... trying to open 80 port for httpd service, but something wrong with my iptables service ... what's wrong with it? What am I doing wrong? ...
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Why there can be only one TIMESTAMP column with CURRENT_TIMESTAMP in DEFAULT clause?

...012-04-10, Milestone 8) Previously, at most one TIMESTAMP column per table could be automatically initialized or updated to the current date and time. This restriction has been lifted. Any TIMESTAMP column definition can have any combination of DEFAULT CURRENT_TIMESTAMP and ON UPDATE C...
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What is the “owning side” in an ORM mapping?

... example of two entities mapped without declaring a owning side: @Entity @Table(name="PERSONS") public class Person { @OneToMany private List<IdDocument> idDocuments; } @Entity @Table(name="ID_DOCUMENTS") public class IdDocument { @ManyToOne private Person person; } From a...
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How are virtual functions and vtable implemented?

...ons in C++": Whenever a program has a virtual function declared, a v - table is constructed for the class. The v-table consists of addresses to the virtual functions for classes that contain one or more virtual functions. The object of the class containing the virtual function contains a virtual...
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How to import multiple .csv files at once?

...r answers using things like do.call(rbind,...), dplyr::bind_rows() or data.table::rbindlist(). If you really want each data frame in a separate object, even though that's often inadvisable, you could do the following with assign: temp = list.files(pattern="*.csv") for (i in 1:length(temp)) assign(...
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How do I get SUM function in MySQL to return '0' if no values are found?

...Use COALESCE to avoid that outcome. SELECT COALESCE(SUM(column),0) FROM table WHERE ... To see it in action, please see this sql fiddle: http://www.sqlfiddle.com/#!2/d1542/3/0 More Information: Given three tables (one with all numbers, one with all nulls, and one with a mixture): SQL Fidd...
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How To Change DataType of a DataColumn in a DataTable?

... You cannot change the DataType after the Datatable is filled with data. However, you can clone the Data table, change the column type and load data from previous data table to the cloned table as shown below. DataTable dtCloned = dt.Clone(); dtCloned.Columns[0].DataTyp...
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Export Postgresql table data using pgAdmin

... Just right click on a table and select "backup". The popup will show various options, including "Format", select "plain" and you get plain SQL. pgAdmin is just using pg_dump to create the dump, also when you want plain SQL. It uses something lik...