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App Inventor 2 中文网原创内容 · App Inventor 2 中文网
...nventor 2 模拟sleep函数
【技巧】App Inventor 2 过滤蓝牙设备列表
【代码简洁之道】App Inventor 2 任何(Any)代码块
【技巧】代码块导出图像，以及还原
【技巧】块拓展：参数可变
【技巧】拷贝及分享功能
【技巧】App Inventor 2...
Vsphere 6 集群上 安装 oracle rac 遇到的共享磁盘故障 - 数据库(内核) - ...
...30多个小时。
4号下午的时候，负责和联系联想的同事转啊转啊，终于转到了VMwARE，并且联系上了原厂工程师。
对了我们购买的VMWARE 是联想的OEM版，直接联系VMWARE是没有卵用的。必须经过联想。
关于配置Oracle RAC最佳配置参...
How to open every file in a folder?
...rking directory location here
counter = 0 #keep a count of all files found
csvfiles = [] #list to store all csv files found at location
filebeginwithhello = [] # list to keep all files that begin with 'hello'
otherfiles = [] #list to keep any other file that do not match the criteria
for file in os...
Split (explode) pandas dataframe string entry to separate rows
...lumn of text strings contains comma-separated values. I want to split each CSV field and create a new row per entry (assume that CSV are clean and need only be split on ','). For example, a should become b :
...
App Inventor 2 低功耗蓝牙(BLE) 硬件接入、数据通信及IO控制 · App Inventor 2 中文网
...下：
扫描蓝牙设备，代码如下：
扫描完成后，设备列表展示到“列表显示框”组件中：
点击列表中的目标设备（一般硬件文档会有说明，名称会有特别的标识），连接蓝牙设备的代码如下：
蓝牙App控制硬件
开始控制...
Rails: How does the respond_to block work?
...# index.html.erb
format.json { render :json => @posts }
format.csv { render :csv => @posts }
format.js
end
end
The csv line will cause to_csv to be called on each post when you visit /posts.csv. This makes it easy to export data as CSV (or any other format) from your rails ...
How to use the “number_to_currency” helper method in the model rather than view?
...in Sam’s answer.
If you think “but I really need this to write my to_csv & to_pdf methods in my model!”, then your entire premise is wrong—after all, you don’t have a to_html method, do you? And yet your object is very often rendered as HTML. Consider creating a new class for generat...
LINQ Aggregate algorithm explained
...in sequence) to make 6. Then adds 6 and 4 to make 10.
Example 2. create a csv from an array of strings
var chars = new []{"a","b","c", "d"};
var csv = chars.Aggregate( (a,b) => a + ',' + b);
Console.WriteLine(csv); // Output a,b,c,d
This works in much the same way. Concatenate a a comma and b...
How can I combine multiple rows into a comma-delimited list in Oracle? [duplicate]
...('Antigua');
SELECT SUBSTR (SYS_CONNECT_BY_PATH (country_name , ','), 2) csv
FROM (SELECT country_name , ROW_NUMBER () OVER (ORDER BY country_name ) rn,
COUNT (*) OVER () cnt
FROM countries)
WHERE rn = cnt
START WITH rn = 1
CONNECT BY rn = PRIOR rn + 1;
...
Postgresql GROUP_CONCAT equivalent?
...method, if they are not desired.
Casting ANYARRAY to TEXT best simulates CSV output as elements that contain embedded commas are double-quoted in the output in standard CSV style. Neither array_to_string() or string_agg() (the "group_concat" function added in 9.1) quote strings with embedded comma...