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How do I update if exists, insert if not (AKA “upsert” or “merge”) in MySQL?
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Use INSERT ... ON DUPLICATE KEY UPDATE. For example:
INSERT INTO `usage`
(`thing_id`, `times_...
OceanBase使用libeasy原理源码分析：服务器端 - 数据库(内核) - 清泛网 - ...
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一、OceanBase启动时的使用模式
二、 基础数据结构
2.1 easy_list_t
2.2 easy_pool_t
2.3 easy_buf_t
2.4 easy_connection_t
三、 连接建立
四、 同步处理(OceanBase少量使用这种模式)
五、 异步处理(OceanBase大量采用这种模式)
六、 资源管...
UILabel with text of two different colors
...ame
value:[UIColor redColor]
range:NSMakeRange(10, 1)];
[label setAttributedText: text];
I created a UILabel extension to do it.
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Is this object-lifetime-extending-closure a C# compiler bug?
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answered Dec 14 '11 at 19:15
Eric LippertEric Lippert
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What does android:layout_weight mean?
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Using jQuery to see if a div has a child with a certain class
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201
You can use the find function:
if($('#popup').find('p.filled-text').length !== 0)
// Do Stuf...
Javascript: formatting a rounded number to N decimals
...number, something like:
var s = number.toString();
if (s.indexOf('.') == -1) s += '.';
while (s.length < s.indexOf('.') + 4) s += '0';
(Note that this assumes that the regional settings of the client uses period as decimal separator, the code needs some more work to function for other settings...
Linux/Unix command to determine if process is running?
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14 Answers
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Boolean vs tinyint(1) for boolean values in MySQL
...atabase for boolean values? I use boolean but my colleague uses tinyint(1) .
6 Answers
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How to list npm user-installed packages?
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