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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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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
{
...
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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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...
MySQL error 1449: The user specified as a definer does not exist
...r is a more little tricky:
How to change the definer for views
Run this SQL to generate the necessary ALTER statements
SELECT CONCAT("ALTER DEFINER=`youruser`@`host` VIEW ",
table_name, " AS ", view_definition, ";")
FROM information_schema.views
WHERE table_schema='your-database-name';
Copy ...
How do I remove the first characters of a specific column in a table?
In SQL, how can I remove the first 4 characters of values of a specific column in a table? Column name is Student Code and an example value is ABCD123Stu1231 .
I want to remove first 4 chars from my table for all records
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count (non-blank) lines-of-code in bash
...bb' -prune -o -path './js/3rdparty' -prune -o -print | egrep '\.php|\.as|\.sql|\.css|\.js' | grep -v '\.svn' | xargs cat | sed '/^\s*$/d' | wc -l
The above will give you the total count of lines of code (blank lines removed) for a project (current folder and all subfolders recursively).
In the ab...