大约有 43,000 项符合查询结果（耗时：0.0267秒） [XML]
Appending to an existing string
... How do you do s <<! "bar", as in to modify the state of the object? concat!("bar") doesn't work...
– xxjjnn
Dec 21 '12 at 11:32
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How do I change the data type for a column in MySQL?
...r type, you can generate queries using a query like this:
select distinct concat('alter table ',
table_name,
' modify ',
column_name,
' <new datatype> ',
if(is_nullable = 'NO', '...
How do I see all foreign keys to a table or column?
...t name, which is required in some cases (e.g. drop contraint):
select
concat(table_name, '.', column_name) as 'foreign key',
concat(referenced_table_name, '.', referenced_column_name) as 'references',
constraint_name as 'constraint name'
from
information_schema.key_column_usage
wher...
Rails 4 LIKE query - ActiveRecord adds quotes
...xpose you to SQL-injection (which is bad). I would suggest you use the SQL CONCAT() function to prepare the string like so:
"name LIKE CONCAT('%',?,'%') OR postal_code LIKE CONCAT('%',?,'%')", search, search)
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Ant: How to execute a command for each file in directory?
...esource property="element" unless:blank="@{list}" >
<concat>@{list}</concat>
<filterchain>
<replaceregex pattern="([^;]*).*" replace="\1" />
</filterchain>
</loadresource>
...
Detect if value is number in MySQL
...
This should work in most cases.
SELECT * FROM myTable WHERE concat('',col1 * 1) = col1
It doesn't work for non-standard numbers like
1e4
1.2e5
123. (trailing decimal)
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How to create a MySQL hierarchical recursive query
...) initialisation
where find_in_set(parent_id, @pv)
and length(@pv := concat(@pv, ',', id))
Here is a fiddle.
Here, the value specified in @pv := '19' should be set to the id of the parent you want to select all the descendants of.
This will work also if a parent has multiple children. Howe...
Can I “multiply” a string (in C#)?
...
In .NET 4 you can do this:
String.Concat(Enumerable.Repeat("Hello", 4))
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Is there any haskell function to concatenate list with separator?
Is there a function to concatenate elements of a list with a separator?
For example:
5 Answers
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How to combine paths in Java?
...oes have a class FilenameUtils that can do this kind of thing, such as the concat() method.
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