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Duplicating a MySQL table, indices, and data
...char(255))
BEGIN
-- DROP TABLE IF EXISTS GLS_DEVICES_OLD;
SET @query = concat('DROP TABLE IF EXISTS ',tbl_name,'_OLD');
PREPARE stmt FROM @query;
EXECUTE stmt;
DEALLOCATE PREPARE stmt;
-- CREATE TABLE GLS_DEVICES_NEW LIKE GLS_DEVICES;
SET @query = concat('CREATE TABLE ',tbl_name,'_NEW...
XDocument.ToString() drops XML Encoding Tag
...
use this:
output.Text = String.Concat(xml.Declaration.ToString() , xml.ToString())
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Easy way to concatenate two byte arrays
What is the easy way to concatenate two byte arrays?
12 Answers
12
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Default value in Go's method
...s
// Both parameters are optional, use empty string for default value
func Concat1(a string, b int) string {
if a == "" {
a = "default-a"
}
if b == 0 {
b = 5
}
return fmt.Sprintf("%s%d", a, b)
}
**Option 2:** A single optional parameter at the end
// a is required, b is optional...
How do I modify fields inside the new PostgreSQL JSON datatype?
... required to manipulate json values).
Merging 2 (or more) JSON objects (or concatenating arrays):
SELECT jsonb '{"a":1}' || jsonb '{"b":2}', -- will yield jsonb '{"a":1,"b":2}'
jsonb '["a",1]' || jsonb '["b",2]' -- will yield jsonb '["a",1,"b",2]'
So, setting a simple key can be done using:...
关于我们 · App Inventor 2 中文网，少儿编程陪伴者
... 累计在线时长 50000 + 时 文档翻译进度代码块右键"帮助" ...
How can I record a Video in my Android App.?
...tFile("/sdcard/videocapture_example.mp4");
recorder.setMaxDuration(50000); // 50 seconds
recorder.setMaxFileSize(5000000); // Approximately 5 megabytes
}
private void prepareRecorder() {
recorder.setPreviewDisplay(holder.getSurface());
try {
reco...
Extract numbers from a string
...ul with this method: something like 'In My Car_Price : 500.00 will print : 50000
– ErickBest
Jul 22 '13 at 10:10
20
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Most efficient way to concatenate strings in JavaScript?
... every browser.
For building strings in the DOM, it seems to be better to concatenate the string first and then add to the DOM, rather then iteratively add it to the dom. You should benchmark your own case though.
(Thanks @zAlbee for correction)
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List of Big-O for PHP functions
...l effectively O(1) for most realistic values).
$tests = 1000000;
$max = 5000001;
for( $i = 1; $i <= $max; $i += 10000 ) {
//create lookup array
$array = array_fill( 0, $i, NULL );
//build test indexes
$test_indexes = array();
for( $j = 0; $j < $tests; $j++ ) {
...