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How do I insert NULL values using PDO?

...nstance $query = $db->prepare($sql); //Works with INT, FLOAT, ETC. $query->bindValue(':productId', !empty($productId) ? $productId : NULL, PDO::PARAM_INT); //Works with strings. $query->bindValue(':productName',!empty($productName) ? $productName : NULL, PDO::PA...
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移动前端开发之viewport的深入理解 - 更多技术 - 清泛网 - 专注C/C++及内核技术

...是,devicePixelRatio在不同的浏览器中还存在些许的兼容性问题,所以我们现在还并不能完全信赖这个东西,具体的情况可以看下这篇文章。 devicePixelRatio的测试结果: 三、PPK的关于三个viewport的理论 ppk大神对于移动设备上...
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Doctrine - How to print out the real sql, not just the prepared statement?

...gt;getSql(); works Edit: to view all the mysql queries I use sudo vim /etc/mysql/my.cnf and add those 2 lines: general_log = on general_log_file = /tmp/mysql.log and restart mysql share | ...
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How can I get the sha1 hash of a string in node.js?

... default. So sha1sum({}) === sha1sum({"foo":"bar"}) === sha1sum({"a":1}), etc. – maerics Jun 4 '15 at 21:40 ...
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华为公司的新产品研发流程管理 - 项目管理 - 清泛网 - 专注C/C++及内核技术

...要信息或是已知的也或是可知的,只是没有人提出正确的问题或没有人做出正确的决策而已。   研究表明,如果一个公司较早做出取消或调整的决定,那么在那些没有投入市场的产品上所浪费的便要减少许多。一流公司在计...
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从估值5千万到一无所有 90后的他感觉梦境一场 - 资讯 - 清泛网 - 专注C/C++...

...O2O现在还没到风口。宠物行业的根本不在这里,这是源头问题。”与此同时,他对爱狗团的方向也进行了调整。夏军原本做的是宠物O2O,类似于美团的团购模式,将买家导入到线下的商户。而他放弃了O2O做法,现在做的模式不像...
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搭建高可用mongodb集群(四)—— 分片 - 大数据 & AI - 清泛网 - 专注C/C++及内核技术

...可用mongodb集群(三)—— 深入副本集》搭建后还有两个问题没有解决:从节点每个上面的数据都是对数据库全量拷贝, 按照上一节中《搭建高可用mongodb集群(三)—— 深入副本集》搭建后还有两个问题没有解决: 从节点...
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What is the difference between Amazon S3 and Amazon EC2 instance?

...t;<-- this is required for running server services (php, apache, mySQL, etc). This can be ephemeral so you can lose your data with a reboot or persistent, you have to specify persistent. S3 uses object storage - blob - Binary Large OBject file system like flat databases, store on the object leve...
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Replacing all non-alphanumeric characters with empty strings

...e second one doesn't answer the question. What about characters like : / \ etc? – WW. Dec 29 '14 at 4:03 add a comment  |  ...
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Bash Script : what does #!/bin/bash mean? [duplicate]

... unix shell, which might be bash or any other variant like ksh, dash, zsh, etc – Karthik T Dec 14 '12 at 3:10 When bas...