大约有 42,000 项符合查询结果（耗时：0.0238秒） [XML]
How to use a servlet filter in Java to change an incoming servlet request url?
...h.
Use straightforward java.lang.String methods like substring(), split(), concat() and so on to extract the part of interest and compose the new path.
Use either ServletRequest#getRequestDispatcher() and then RequestDispatcher#forward() to forward the request/response to the new URL (server-side re...
ASP.NET MVC Razor Concatenation
...
I prefer:
<li id="@String.Concat("item_", item.TheItemId)">
The verbosity tells the support developers exactly what is happening, so it's clear and easy to understand.
sh...
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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Strangest language feature
...
+ for string concatenation is horrible
– Matteo Riva
Jan 3 '10 at 16:42
416
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SQL WHERE.. IN clause multiple columns
...and always will come from T1)
No DISTINCT or DISTINCT in the wrong place
CONCATENATION OF COLUMNS WITH SEPARATOR (Not very safe, horrible performance)
The functional problem is that if you use a separator which might occur in a column, it gets tricky to ensure that the outcome is 100% accurate. T...
Get table column names in MySQL?
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How about this:
SELECT @cCommand := GROUP_CONCAT( COLUMN_NAME ORDER BY column_name SEPARATOR ',\n')
FROM INFORMATION_SCHEMA.COLUMNS
WHERE TABLE_SCHEMA = 'my_database' AND TABLE_NAME = 'my_table';
SET @cCommand = CONCAT( 'SELECT ', @cCommand, ' from my_database.my_t...
Optimal way to concatenate/aggregate strings
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SOLUTION
The definition of optimal can vary, but here's how to concatenate strings from different rows using regular Transact SQL, which should work fine in Azure.
;WITH Partitioned AS
(
SELECT
ID,
Name,
ROW_NUMBER() OVER (PARTITION BY ID ORDER BY Name) AS N...
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'
...
Detect if value is number in MySQL
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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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im...