大约有 25,300 项符合查询结果（耗时：0.0486秒） [XML]
JPA getSingleResult() or null
I have an insertOrUpdate method which inserts an Entity when it doesn't exist or update it if it does. To enable this, I have to findByIdAndForeignKey , if it returned null insert if not then update. The problem is how do I check if it exists? So I tried getSingleResult . But it throws an ex...
Querying data by joining two tables in two database on different servers
... to use sp_addlinkedserver to create a server link. See the reference documentation for usage. Once the server link is established, you'll construct the query as normal, just prefixing the database name with the other server. I.E:
-- FROM DB1
SELECT *
FROM [MyDatabaseOnDB1].[dbo].[MyTable] tab1
...
How to add external library in IntelliJ IDEA?
...ry (places it in the /libs directory) to my project. When I try to use the methods from that library, I see that they are in red color which means that the library is not recognized. When I click Ctrl+B, I get a message "Cannot find declaration to go to".
...
Objective-C pass block as parameter
How can I pass a Block to a Function / Method ?
11 Answers
11
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Writing a Python list of lists to a csv file
... "wb") as f:
writer = csv.writer(f)
writer.writerows(a)
This assumes your list is defined as a, as it is in your question. You can tweak the exact format of the output CSV via the various optional parameters to csv.writer() as documented in the library reference page linked above.
Update ...
jQuery textbox change event doesn't fire until textbox loses focus?
...e = $(this).val();
console.log('The text box really changed this time');
}
});
And if you want to be super duper pedantic then you should use an interval timer to cater for auto fill, plugins, etc:
var lastValue = '';
setInterval(function() {
if ($("#textbox").val() != lastValue) ...
Load RSA public key from file
...blic class PrivateKeyReader {
public static PrivateKey get(String filename)
throws Exception {
byte[] keyBytes = Files.readAllBytes(Paths.get(filename));
PKCS8EncodedKeySpec spec =
new PKCS8EncodedKeySpec(keyBytes);
KeyFactory kf = KeyFactory.getInstance("RSA");
return k...
Best XML parser for Java [closed]
...t the most, UTF-8 encoded) XML files, rummage around looking at various elements and attributes, perhaps modify a few and write the XML back out again to disk (preferably with nice, indented formatting).
...
How do I find a stored procedure containing ?
...rch a SQL server 2008 for stored procedures containing where maybe
the name of a database field or variable name.
20 An...
Difference between e.target and e.currentTarget
I don't understand the difference, they both seem the same but I guess they are not.
10 Answers
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