比较不错的一个在线工具网站http://tool.oschina.net/ 1、问题描述:工作中经常用到UE,每次修改文件后,UE会保存一个bak后缀的文件,不想再生成这类文件。 解决方法: 打开UE菜单中 高级-配置-文件处理-备份 选择左侧的不备份 就可以了。 2、问题描述:从SV
比较不错的一个在线工具网站http://tool.oschina.net/
1、问题描述:工作中经常用到UE,每次修改文件后,UE会保存一个bak后缀的文件,不想再生成这类文件。
解决方法: 打开UE菜单中 高级->配置->文件处理->备份 选择左侧的不备份 就可以了。
2、问题描述:从SVN上以前CHECK的代码,忘记了地址
解决方法:在以前下载的项目文件上右键->属性,多了个Subversion栏,选中Subversion栏,里面有一个URL,就是check代码的地址了。
3、问题描述:使用spring tools suit开发工具,服务器使用的是wildfly8.0,但sts对JBOSS的支持只到5.0
解决方法:打开help->install new software
http://download.jboss.org/jbosstools/updates/stable/kepler/ 名称可以随便写
点击OK->NEXT进入窗口,选择全选,一路向下,完成安装,提示需要重启IDE
重启IDE后在Windows->Preference->Server->Runtime Environment 中即可以添加Wildfly了
4、问题描述:新打开的Eclipse开发工具中不显示代码行数
解决方法:打开Windows->Preference->General->Editors->Text Editors 选中Show Line numbers
5、问题描述:SVN下载的代码有时需要解除与SVN的关联
解决方法:新建一个记事本,粘贴如下代码,保存为reg后缀文件,双击该文件执行
Windows Registry Editor Version 5.00 [HKEY_LOCAL_MACHINE\SOFTWARE\Classes\Folder\shell\DeleteSVN] @="删除该目录下面.svn文件" [HKEY_LOCAL_MACHINE\SOFTWARE\Classes\Folder\shell\DeleteSVN\command] @="cmd.exe /c \"TITLE Removing SVN Folders in %1 && COLOR 9A && FOR /r \"%1\" %%f IN (.svn) DO RD /s /q \"%%f\" \""
执行完成后,选中项目右键,出现删除SVN文件的菜单,即可解除与SVN的关联。
如果要解除右键中该菜单,则再按照上面步骤执行下面代码即可
<pre name="code" class="html">Windows Registry Editor Version 5.00 [-HKEY_LOCAL_MACHINE\SOFTWARE\Classes\Folder\shell\DeleteSVN]
6、问题描述:Eclipse中有时我们需要复制一个工程为新工程
解决方法:1、进入该工程跟目录,直接复制一份备份工程,例如“testA”工程,复制一份就为“testA备份”,直接重命名“testA备份”为“testB”
2、进入testB工程目录下,修改工程中.project文件中
3、进入testB工程目录下的.settings文件下,修改org.eclipse.wst.common.component文件中
7、问题描述:数据库用的mysql,执行一个关联操作时报错 Every derived table must have its own alias
假设SQL语句为 Select * From (Select A.*,B.* From A Left Join B On A.xx=B.xx)
解决方法:mysql中进行嵌套查询的时候,子查询的结果作为一个派生表来进行上一级查询的时候,派生表必须指定一个别名。
Select * From (Select A.*,B.* From A Left Join B On A.xx=B.xx) As Test 这样即可执行成功。

MySQL is suitable for beginners to learn database skills. 1. Install MySQL server and client tools. 2. Understand basic SQL queries, such as SELECT. 3. Master data operations: create tables, insert, update, and delete data. 4. Learn advanced skills: subquery and window functions. 5. Debugging and optimization: Check syntax, use indexes, avoid SELECT*, and use LIMIT.

MySQL efficiently manages structured data through table structure and SQL query, and implements inter-table relationships through foreign keys. 1. Define the data format and type when creating a table. 2. Use foreign keys to establish relationships between tables. 3. Improve performance through indexing and query optimization. 4. Regularly backup and monitor databases to ensure data security and performance optimization.

MySQL is an open source relational database management system that is widely used in Web development. Its key features include: 1. Supports multiple storage engines, such as InnoDB and MyISAM, suitable for different scenarios; 2. Provides master-slave replication functions to facilitate load balancing and data backup; 3. Improve query efficiency through query optimization and index use.

SQL is used to interact with MySQL database to realize data addition, deletion, modification, inspection and database design. 1) SQL performs data operations through SELECT, INSERT, UPDATE, DELETE statements; 2) Use CREATE, ALTER, DROP statements for database design and management; 3) Complex queries and data analysis are implemented through SQL to improve business decision-making efficiency.

The basic operations of MySQL include creating databases, tables, and using SQL to perform CRUD operations on data. 1. Create a database: CREATEDATABASEmy_first_db; 2. Create a table: CREATETABLEbooks(idINTAUTO_INCREMENTPRIMARYKEY, titleVARCHAR(100)NOTNULL, authorVARCHAR(100)NOTNULL, published_yearINT); 3. Insert data: INSERTINTObooks(title, author, published_year)VA

The main role of MySQL in web applications is to store and manage data. 1.MySQL efficiently processes user information, product catalogs, transaction records and other data. 2. Through SQL query, developers can extract information from the database to generate dynamic content. 3.MySQL works based on the client-server model to ensure acceptable query speed.

The steps to build a MySQL database include: 1. Create a database and table, 2. Insert data, and 3. Conduct queries. First, use the CREATEDATABASE and CREATETABLE statements to create the database and table, then use the INSERTINTO statement to insert the data, and finally use the SELECT statement to query the data.

MySQL is suitable for beginners because it is easy to use and powerful. 1.MySQL is a relational database, and uses SQL for CRUD operations. 2. It is simple to install and requires the root user password to be configured. 3. Use INSERT, UPDATE, DELETE, and SELECT to perform data operations. 4. ORDERBY, WHERE and JOIN can be used for complex queries. 5. Debugging requires checking the syntax and use EXPLAIN to analyze the query. 6. Optimization suggestions include using indexes, choosing the right data type and good programming habits.


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