大约有 3,551 项符合查询结果（耗时：0.0241秒） [XML]
Hibernate throws org.hibernate.AnnotationException: No identifier specified for entity: com..domain.
...otations on it whatsoever - leave it a simple pojo.
Update: In regards to SQL views, Hibernate docs write:
There is no difference between a view and a base table for a Hibernate mapping. This is transparent at the database level
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MySQL vs MySQLi when using PHP [closed]
Which is better, MySQL or MySQLi? And why? Which should I use?
6 Answers
6
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PostgreSQL “DESCRIBE TABLE”
How do you perform the equivalent of Oracle's DESCRIBE TABLE in PostgreSQL (using the psql command)?
22 Answers
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Best way to check for “empty or null value”
What is best way to check if value is null or empty string in Postgres sql statements?
10 Answers
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How to get the CPU Usage in C#?
...up with this. I needed it for an 8 core machine where I wanted to monitor SQL server. For the code below then I passed in "sqlservr" as appName.
private static void RunTest(string appName)
{
bool done = false;
PerformanceCounter total_cpu = new PerformanceCounter("Process", "% Processor T...
Using group by on multiple columns
... values in a given column
COUNT(*) returns the number of rows in a table
SQL script examples about using aggregate functions:
Let's say we need to find the sale orders whose total sale is greater than $950. We combine the HAVING clause and the GROUP BY clause to accomplish this:
SELECT
orderI...
What are best practices that you use when writing Objective-C and Cocoa? [closed]
... is much less bloated and more memory-efficient when set to nonatomic.
6) SQLite can be a very, very fast way to cache large data sets. A map application for instance can cache its tiles into SQLite files. The most expensive part is disk I/O. Avoid many small writes by sending BEGIN; and COMMIT; b...
Specifying column name in a “references” migration
...ore info on migrations in general, and you may even end up putting calling SQL code directly in your migration. I would say ignore it, as it isn't a normal part of rails, you will get 0 performance out of it, as rails' default generated SQL queries take no advantage of it. link
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Difference between CTE and SubQuery?
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In MSSQL, you need to add a semicolon (;) before WITH, order wise you will get an error. it should be ;WITH blabla AS ...)
– Obinna Nnenanya
Dec 6 '18 at 18:01
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How to get parameters from the URL with JSP
...ed for input on your query
public int delete(int subjectid) {
String sql = "update tbl_subject set isdeleted= '1' where id = "+subjectid+"";
return template.update(sql);
}
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