大约有 42,000 项符合查询结果（耗时：0.0342秒） [XML]
What is the difference between an ORM and an ODM?
...(Object Document Mapper) deals with documents. Am I right in assuming that mySQL is an example of ORM and MongoDB is a example of ODM?
...
SQL SELECT WHERE field contains words
...start, stop) AS (
SELECT 1, 1, CHARINDEX(@sep, @str)
UNION ALL
SELECT pn + 1, stop + 1, CHARINDEX(@sep, @str, stop + 1)
FROM Pieces
WHERE stop > 0
)
SELECT
pn AS Id,
SUBSTRING(@str, start, CASE WHEN stop >...
How to find the lowest common ancestor of two nodes in any binary tree?
...ible. For both nodes in question construct a list containing the path from root to the node by starting at the node, and front inserting the parent.
So for 8 in your example, you get (showing steps): {4}, {2, 4}, {1, 2, 4}
Do the same for your other node in question, resulting in (steps not shown...
Simplest way to profile a PHP script
... all the data
$select_query = "SELECT * FROM data_table";
$result = mysql_query($select_query);
prof_flag("Retrieve data");
$rows = array();
$found_data=false;
while($r = mysql_fetch_assoc($result))
{
$found_data=true;
$rows[] = $r;
}
prof_flag("Close DB");
...
INSERT … ON DUPLICATE KEY (do nothing)
... uses resources for the second action.
Use INSERT IGNORE ...,
Negative : MySQL will not show any errors if something goes wrong, so you cannot handle the errors. Use it only if you don’t care about the query.
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GUI Tool for PostgreSQL [closed]
...t to know is there any GUI Tool for PostgreSQL just like SQLYog for MySql
2 Answers
...
'console' is undefined error for Internet Explorer
...ine,timelineEnd,group,groupCollapsed,groupEnd,clear
*/
(function() {
// Union of Chrome, Firefox, IE, Opera, and Safari console methods
var methods = ["assert", "cd", "clear", "count", "countReset",
"debug", "dir", "dirxml", "error", "exception", "group", "groupCollapsed",
"groupEnd", "...
What's an Aggregate Root?
...o properly use the repository pattern. The central concept of an Aggregate Root keeps coming up. When searching both the web and Stack Overflow for help with what an aggregate root is, I keep finding discussions about them and dead links to pages that are supposed to contain base definitions.
...
SQL: How to perform string does not equal
... Just noticed that the <=> operator only exists in the MySQL world, for more info see what is <=>
– Top-Master
Apr 27 '19 at 6:18
...
img src SVG changing the styles with CSS
...saturate(5) hue-rotate(175deg);
}
more info in this article https://blog.union.io/code/2017/08/10/img-svg-fill/
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