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When to use SELECT … FOR UPDATE?
...ds on the concurrency control your database system is using.
MyISAM in MySQL (and several other old systems) does lock the whole table for the duration of a query.
In SQL Server, SELECT queries place shared locks on the records / pages / tables they have examined, while DML queries place update lo...
How to access a dictionary element in a Django template?
...de in your templates and vice-versa.
I'd try the above method and see what SQL the ORM generates as I'm not sure off the top of my head if it will pre-cache the properties and just create a subselect for the property or if it will iteratively / on-demand run the query to calculate vote count. But if...
创业公司如何实施敏捷开发 - 资讯 - 清泛网 - 专注C/C++及内核技术
...业公司敏捷开发任务墙
每日站立会议大家认领任务。包括业务任务、开发设计、开发编码、前端设计开发、测试等都是一个个任务，统一管理起来。强调的是一个团体，如果有同事请假，其他同事可以顶上完成任务。站立会...
How to select all records from one table that do not exist in another table?
...in basically every database engine ever that attempts to implement ANSI 92 SQL
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Multiline string literal in C#
...whatever line break your source has them as) into the string, however. For SQL, that's not only harmless but probably improves the readability anywhere you see the string - but in other places it may not be required, in which case you'd either need to not use a multi-line verbatim string literal to ...
What is the actual use of Class.forName(“oracle.jdbc.driver.OracleDriver”) while connecting to a dat
...ing the method Class.forName. This methods required an object of type java.sql.Driver. Each JDBC driver contains one or more classes that implements the interface java.sql.Driver.
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Any JDBC 4.0 drivers that are found in your class path are automatically loaded. (However, you must manually load an...
Visual Studio appears to randomly adopt American keyboard layout
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I've definitely had an occasion where SQL Server Management Studio (based on Visual Studio) adopted US keyboard layout for no apparent reason but all other applications were on UK layout so this wasn't a global Windows settings for me.
– Mar...
Creating a copy of a database in PostgreSQL [closed]
...s, and select "New Database". One of the options is the template, and the SQL used to create the database is equivalent. It is so much faster than a dump / restore on the same server.
– jwhitlock
Jun 17 '11 at 15:19
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ros 基本调试 - 更多技术 - 清泛网 - 专注C/C++及内核技术
...条请牢记：
■计划好哪个连接是DTE，哪个是DCE，它们各包括什么类型，牢记你在这两台电脑上各使用了哪个端口（1还是2）。
■制作正确的null modem线。制作null modem线有多种方法，采用不同的方法做出来的线都是不一样的。
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Working copy XXX locked and cleanup failed in SVN
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In my case I solved it by manually deleting a record in the SQLite ".svn\wc" file lock record in the WC_LOCK table.
I opened the "WC" file with SQLite editor and executed
delete from WC_LOCK
Following eakkas's comment, you might need to delete all the entries from WORK_QUEUE ta...