大约有 43,000 项符合查询结果（耗时：0.0309秒） [XML]
How to check if an object is an array?
...r ];
}
Or if you're not concerned about performance, you could just do a concat to a new empty Array.
someVar = [].concat( someVar );
There's also the constructor which you can query directly:
if (somevar.constructor.name == "Array") {
// do something
}
Check out a thorough treatment f...
How do I check if an index exists on a table field in MySQL?
... b.table_type = 'BASE TABLE'
left join (
select concat(x.name, '/', y.name) full_path_schema, y.name index_name
FROM information_schema.INNODB_SYS_TABLES as x
JOIN information_schema.INNODB_SYS_INDEXES as y on x.TABLE_ID = y.TABLE_ID
WHERE x.name = 'your_schema'
...
How to do ToString for a possibly null object?
...nger than just "" + myObj. But I've read that creates extra strings. str.Concat(myObj) seems to work just fine and is "even faster".
– drzaus
Dec 1 '17 at 17:48
add a commen...
MaxJsonLength exception in ASP.NET MVC during JavaScriptSerializer
... string MakeArrayKey(string prefix, int index)
{
return string.Concat(prefix, "[", index.ToString(CultureInfo.InvariantCulture), "]");
}
private static string MakePropertyKey(string prefix, string propertyName)
{
if (string.IsNullOrEmpty(prefix))
{
...
How can I determine if a date is between two dates in Java? [duplicate]
...er year = cal.get(Calendar.YEAR);
oeStartDateStr = oeStartDateStr.concat(year.toString());
oeEndDateStr = oeEndDateStr.concat(year.toString());
Date startDate = sdf.parse(oeStartDateStr);
Date endDate = sdf.parse(oeEndDateStr);
Date d = new Date();
S...
How to change collation of database, table, column?
...ll tables to a certain type (utf8_general_ci in my example below).
SELECT concat
(
'ALTER TABLE ',
t1.TABLE_SCHEMA,
'.',
t1.table_name,
' MODIFY ',
t1.column_name,
' ',
...
C# Sanitize File Name
...
string clean = String.Concat(dirty.Split(Path.GetInvalidFileNameChars()));
share
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Select all columns except one in MySQL?
...way, you need to have permissions of course for doing this ...
SET @sql = CONCAT('SELECT ', (SELECT REPLACE(GROUP_CONCAT(COLUMN_NAME), '<columns_to_omit>,', '') FROM INFORMATION_SCHEMA.COLUMNS WHERE TABLE_NAME = '<table>' AND TABLE_SCHEMA = '<database>'), ' FROM <table>');
...
How to declare a variable in MySQL?
...
For any person using @variable in concat_ws function to get concatenated values, don't forget to reinitialize it with empty value. Otherwise it can use old value for same session.
Set @Ids = '';
select
@Ids := concat_ws(',',@Ids,tbl.Id),
tbl.Col1,
.....
SSMS插件开发指南 - C/C++ - 清泛网 - 专注C/C++及内核技术
...eInfo = cultureInfo.Parent;
resourceName = String.Concat(parentCultureInfo.Name, "Tools");
}
else
{
resourceName = String.Concat(cultureInfo.TwoLetterISOLanguageName, "Tools");
...