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spot1-spot5的数据可以免费下载了
In order to perpetuate and enhance these data, the SPOT World Heritage (SWH) program runned by CNES make available for free to the public the SPOT 1, 2, 3, 4 and 5 archive. These are images (60x60 km) acquired from 1986 until 2015 in L1A level (radiometri解决Connections could not be acquired from the underlying database!
之前一直认为是代码错了，后来网上查资料，发现可能是C3P0和mysql的版本不匹配导致的，更改完C3P0的版本 以后就好了，更改完的版本如下： <dependency> <groupId>mysql</groupId> <artifactId>mysql-connector-java</artifactId> <version>5.1.48</version> </dependency>The cat experiment that tells the vision is acquired or innate
https://computervisionblog.wordpress.com/2013/06/01/cats-and-vision-is-vision-acquired-or-innate/ which illustrate that cat can be learnt to recognize orientation. once the kitten was born with only horizontal line , it won't able to see any verticalMonitor的扩展支持string的超时锁
对Monitor的使用可以防止lock的时间过长并且可以设置其对应的超时时间达到对预期代码的一个控制,合理的使用timeout可以有助于程序的健壮性。但是对于不同的并发程序可能某些时候我们需要的粒度是不一样的,从而产生的一个问题是需要更细粒度的锁来保证,又因为默认的字符串无法共享java.sql.SQLException: Connections could not be acquired from the underlying database!
情景：maven普通java项目，在使用dbutils工具类，以c3p0作为数据源的时候报错。 报错：java.sql.SQLException: Connections could not be acquired from the underlying database! 首先：经过检查，driver，url，user，password无误。 然后，看了别人的博客，有修改mysql驱动包版本的，也有修改c3p0Qt
Qt history: Qt was initially developed by two persons, Haavard Nord(CEO), and Eirik Chambere(President) in early 90. Qt4 was published in Summer 2005(major milestone) It was acquired by Nokia in 2008, and then was acquired by Digia.锁的封装
锁异常的封装，继承与自定义的异常类即可。 struct YR_Lock_Exception : public YR_Exception { YR_Lock_Exception(const string& buffer) : YR_Exception(buffer){} YR_Lock_Exception(const string& buffer, int err) : YR_Exception(buffer,err){} ~YR_Lock_ExcC3P0数据库连接错误：java.sql.SQLException: Connections could not be acquired from the underlying database!异常
今天使用C3P0数据源的时候，一直抛出异常：java.sql.SQLException: Connections could not be acquired from the underlying database!最后终于找到解决办法：MySQL版本不合适，只需要换一个jar包就可以了我原来使用的是mysql-connector-java-5.1.6-bin.jar，然后将jar包换成mysql-connector