1、从外部文档中粘贴时,如果不想要其格式,只要文字,可以使用“Edit-paste as text”命令,而不要直接Ctrl+V。 2、“Command-Add/Remove Netscape resize fix”是一个很有用的命令,它可以使在NC4.0中浏览页面时,改变窗口大小的时候页面不会花掉。 3、所
1、从外部文档中粘贴时,如果不想要其格式,只要文字,可以使用“Edit->paste as text”命令,而不要直接Ctrl+V。
2、“Command->Add/Remove Netscape resize fix”是一个很有用的命令,它可以使在NC4.0中浏览页面时,改变窗口大小的时候页面不会花掉。
3、所有的head元素不可成为库组件,所有元素在被insert library时,其head关联属性被去掉,如style、CSS属性。
4、library组件和template模板不用上传服务器,就可以正确预览使用了该组件或模板的页面。
5、使用“check plugin”behavior来确定访问者浏览器是否安装flash插件,有时候会判断失误,比如明明装了插件却报告没有安装。最好在flash的publish里面设置清楚,而不是简单的输出成.swf文件。
6、不要在同一个页面同时使用表格和层来布置,在Netscape中会导致混乱,从属关系除外。
8、在用图片制作热区链接时,最好给热区命名,防止有时只能在图片上画出直线。
9、当我们将框架结构建立好后,可以将此框架体文件和Site窗体并排放置,然后从Site中选择网页文件拖放到相应的框架中。这适用于框架比较复杂的页面。
10、如果对一张图片不满意,想更换另一张,最简单的方法双击此图片,直接选择要替换的图片即可。
11、在预览网页之前最好先保存一下,有时候在不能正确预览网页,而存一下就可能会解决这个问题。
12、如果你的页面中使用了CSS或是Java Applet,最好不要使用“file->convert->3.0 browser compatible”命令,因为这一选择会把所有3.0 浏览器不认识的定义都抹去。最可怕的是我们不知道在这个过程中Dreamweaver 到底做了什么,具体发生了那些变化。而且要提醒你,对一批页面执行此操作时,一定要先备份,否则可没地方买后悔药。
13、没有任何内容的表格单元在NC中不会显示出来,这时可以插入透明的gif来解决这个问题。
14、design note只能在本地的dreamweaver中被调用,而网页浏览者下载此页面却看不到这一注释。如果你希望别人也能看到,可使用comment功能。
15、使用“hide/show layer”Behavior后,如果在Netscape中有个别的图层无法显示出来,可以在dreamweaver中删掉此图层,再重新定义它,一切就正常了。
16、表格的特点是只有整个表格的内容全部被浏览器down下来才会一次性显示,所以表格里面东西太多,可能浏览器要花很长时间去下载而屏幕上始终没内容。 如果表格太长,要么嵌套一下,要么分成几个表格以加快显示。最好把表格在在纵向分开,比如原来一个3行3列的表格,将其改为3个1行3列的表格。
17、尽量不要在表格单元里面放层,不过在层里面放表格基本没问题。

MySQL is an open source relational database management system, mainly used to store and retrieve data quickly and reliably. Its working principle includes client requests, query resolution, execution of queries and return results. Examples of usage include creating tables, inserting and querying data, and advanced features such as JOIN operations. Common errors involve SQL syntax, data types, and permissions, and optimization suggestions include the use of indexes, optimized queries, and partitioning of tables.

MySQL is an open source relational database management system suitable for data storage, management, query and security. 1. It supports a variety of operating systems and is widely used in Web applications and other fields. 2. Through the client-server architecture and different storage engines, MySQL processes data efficiently. 3. Basic usage includes creating databases and tables, inserting, querying and updating data. 4. Advanced usage involves complex queries and stored procedures. 5. Common errors can be debugged through the EXPLAIN statement. 6. Performance optimization includes the rational use of indexes and optimized query statements.

MySQL is chosen for its performance, reliability, ease of use, and community support. 1.MySQL provides efficient data storage and retrieval functions, supporting multiple data types and advanced query operations. 2. Adopt client-server architecture and multiple storage engines to support transaction and query optimization. 3. Easy to use, supports a variety of operating systems and programming languages. 4. Have strong community support and provide rich resources and solutions.

InnoDB's lock mechanisms include shared locks, exclusive locks, intention locks, record locks, gap locks and next key locks. 1. Shared lock allows transactions to read data without preventing other transactions from reading. 2. Exclusive lock prevents other transactions from reading and modifying data. 3. Intention lock optimizes lock efficiency. 4. Record lock lock index record. 5. Gap lock locks index recording gap. 6. The next key lock is a combination of record lock and gap lock to ensure data consistency.

The main reasons for poor MySQL query performance include not using indexes, wrong execution plan selection by the query optimizer, unreasonable table design, excessive data volume and lock competition. 1. No index causes slow querying, and adding indexes can significantly improve performance. 2. Use the EXPLAIN command to analyze the query plan and find out the optimizer error. 3. Reconstructing the table structure and optimizing JOIN conditions can improve table design problems. 4. When the data volume is large, partitioning and table division strategies are adopted. 5. In a high concurrency environment, optimizing transactions and locking strategies can reduce lock competition.

In database optimization, indexing strategies should be selected according to query requirements: 1. When the query involves multiple columns and the order of conditions is fixed, use composite indexes; 2. When the query involves multiple columns but the order of conditions is not fixed, use multiple single-column indexes. Composite indexes are suitable for optimizing multi-column queries, while single-column indexes are suitable for single-column queries.

To optimize MySQL slow query, slowquerylog and performance_schema need to be used: 1. Enable slowquerylog and set thresholds to record slow query; 2. Use performance_schema to analyze query execution details, find out performance bottlenecks and optimize.

MySQL and SQL are essential skills for developers. 1.MySQL is an open source relational database management system, and SQL is the standard language used to manage and operate databases. 2.MySQL supports multiple storage engines through efficient data storage and retrieval functions, and SQL completes complex data operations through simple statements. 3. Examples of usage include basic queries and advanced queries, such as filtering and sorting by condition. 4. Common errors include syntax errors and performance issues, which can be optimized by checking SQL statements and using EXPLAIN commands. 5. Performance optimization techniques include using indexes, avoiding full table scanning, optimizing JOIN operations and improving code readability.


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