qt code has been compiled using mingw, qt a good school learning materials

人们在使用SQL时往往会陷入一个误区，即太关注于所得的结果是否正确，而忽略了不同的实现方法之间可能存在的 性能差异，这种性能差异在大型的或是复杂的数据库环境中（如联机事务处理OLTP或决策支持系统DSS）中表现得尤为明 显。笔者在工作实践中发现，不良的SQL往往来自于不恰当的索引设计、不充份的连接条件和不可优化的where子句。在对 它们进行适当的优化后，其运行速度有了明显地提高！下面我将从这三个方面分别进行总结：-people in the use of SQL often fall into the trap, that is too focused on the findings is correct, and ignore a different method may exist between the performance differences, these differences in large or complex database environment (such as online transaction processing or decision support OLTP system DSS) has become even more obvious. In practice I found that the poor tend to SQL from inappropriate design of the index, not fully connected and non-optimal conditions where the phrase. On their proper optimization, and their operating speed has been improved! Now I will be three aspects of this summary :

一个可以建立各种异形ToolTip的程序- May establish each kind of different shape ToolTip the procedure

这个是我在网站上看到的一个仿影音传送带界面的制作程序,觉得对于做界面的朋友会有所帮助.-this is what I see on the website of a fake video production conveyor interface procedures do think that the interface friends will be helpful.

此示例聊天用java，并将该软件用于服务器和客户机之间使用Java GUI和访问使用端口和插座进行沟通。

可以在打开文件的对话框上实现图像预览的程序。-can open the file in the dialog on Image preview procedures.

一种非常好的烟花程序，有声音，有图像。使用C++ builder编制而成。-a very good fireworks procedures, voices and images. The use of compiled C builder.

一套比较完整的适合于数据库程序的界面（风格很酷）--A suit of program interfaces which are more fit for database

如何使用本软件 1、首先在“请输入函数 y=”后面的输入框中输入您想要画图的函数形式，注意，其中乘除幂运算符必须在前面加点，否则会出错画不出来。 2、在“请输入区间 x 从”…“到”…的输入框中输入您想要画图的区间，也就是自变量的取值范围。 3、点击“画图”按钮，即可画出函数的图形。 4、点击“关闭”按钮，可以退出本软件。-1 How to use this software, first of all in the Please enter the function y = behind the input box, enter the function you want to draw the form of attention, in which multiplication and division operator must power points in front, otherwise they will not come out wrong painting. 2, in the Please enter the range of x from the ... to ... the input box, enter the interval you want to draw, that is, since the variables range. 3, click on the Paint button, you can draw function graphics. 4, click Close button, you can withdraw from this software.

This a JPEG encoding & decoding program of still image. It does not use level shifting. Discrete Cosine transform (DCT) is performed both by classical & Chen s Flowgraph methods. Predefined JPEG quantization array & zigzag order are used here. RUN - LEVEL coding is used instead of Huffman coding. Compression ratio is compared for each DCT method. Effect of coarse and fine quantization is also examined. The execution time of 2 DCT methods is also checked. In addition, most energatic DCT coefficients are also applied to examine the effect in MatLab 7.4.0 R2007a. Input is 9 gray scale pictures & output is 9*9=81 pictures to compare. Blocking effect is obvious. -This is a JPEG encoding & decoding program of still image. It does not use level shifting. Discrete Cosine transform (DCT) is performed both by classical & Chen s Flowgraph methods. Predefined JPEG quantization array & zigzag order are used here. RUN - LEVEL coding is used instead of Huffman coding. Compression ratio is compar

颜色平滑改变的进度条-The progress bar which changs its color smoothly