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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...
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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PostgreSQL database default location on Linux
What is the default directory where PostgreSQL will keep all databases on Linux?
8 Answers
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`find -name` pattern that matches multiple patterns
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My default has been:
find -type f | egrep -i "*.java|*.css|*.cs|*.sql"
Like the less process intencive find execution by Brendan Long and Stephan202 et al.:
find Documents \( -name "*.py" -or -name "*.html" \)
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Possible to perform cross-database queries with PostgreSQL?
...sult ), but is there anyway to perform a cross-database query using PostgreSQL?
8 Answers
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What is the difference between inversedBy and mappedBy?
... mappedBy are used by the INTERNAL DOCTRINE engine to reduce the number of SQL queries it has to do to get the information you need. To be clear if you don't add inversedBy or mappedBy your code will still work but will not be optimized.
So for example, look at the classes below:
class Task
{
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How can I get dict from sqlite query?
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You could use row_factory, as in the example in the docs:
import sqlite3
def dict_factory(cursor, row):
d = {}
for idx, col in enumerate(cursor.description):
d[col[0]] = row[idx]
return d
con = sqlite3.connect(":memory:")
con.row_factory = dict_factory
cur = con.curso...
Count Rows in Doctrine QueryBuilder
...duces additional query like SELECT COUNT(*) AS dctrn_count FROM (_ORIGINAL_SQL_) dctrn_result) dctrn_table which is actually nothing special but well known COUNT(*) solution
– Vladyslav Kolesov
Feb 23 '16 at 17:32
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Hibernate SessionFactory vs. JPA EntityManagerFactory
...The Session and the `EntityManager translate entity state transitions into SQL statements, like SELECT, INSERT, UPDATE, and DELETE.
Hibernate vs. JPA bootstrap
When bootstrapping a JPA or Hibernate application, you have two choices:
You can bootstrap via the Hibernate native mechanism, and creat...