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Code Issues

Improvement #6786 - Add session time zone to system context.

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This commit is contained in:
Adriano dos Santos Fernandes 2021-05-03 11:19:14 -03:00
parent 9436f57498
commit 5018dd6109
3 changed files with 24 additions and 0 deletions
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2
doc/sql.extensions/README.context_variables2
View File

@ -131,6 +131,8 @@ Usage:
EXT_CONN_POOL_ACTIVE_COUNT | Count of active connections, associated with pool
|
EXT_CONN_POOL_LIFETIME | Idle connection lifetime, in seconds
|
SESSION_TIMEZONE | Current session time zone.
Notes:
To prevent DoS attacks against Firebird Server you are not allowed to have

15
doc/sql.extensions/README.time_zone.md
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@ -329,6 +329,21 @@ select localtimestamp
from rdb$database;
```
### `SESSION_TIMEZONE` context variable
`RDB$GET_CONTEXT('SYSTEM', 'SESSION_TIMEZONE')` could be used to obtain the session current time zone.
#### Examples
```
set time zone 'america/sao_paulo';
select rdb$get_context('SYSTEM', 'SESSION_TIMEZONE') from rdb$database;
-- Result: America/Sao_Paulo
set time zone '-3:00';
-- Result: -03:00
```
# Changes in `CURRENT_TIME` and `CURRENT_TIMESTAMP`
In version 4.0, `CURRENT_TIME` and `CURRENT_TIMESTAMP` are changed to return `TIME WITH TIME ZONE` and `TIMESTAMP WITH TIME ZONE` (with time zone set to the session time zone), different than previous versions, that returned the types without time zone.

7
src/jrd/SysFunction.cpp
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@ -384,6 +384,7 @@ const char
SESSION_IDLE_TIMEOUT[] = "SESSION_IDLE_TIMEOUT",
STATEMENT_TIMEOUT[] = "STATEMENT_TIMEOUT",
EFFECTIVE_USER_NAME[] = "EFFECTIVE_USER",
SESSION_TIMEZONE[] = "SESSION_TIMEZONE",
// SYSTEM namespace: transaction wise items
TRANSACTION_ID_NAME[] = "TRANSACTION_ID",
ISOLATION_LEVEL_NAME[] = "ISOLATION_LEVEL",
@ -4331,6 +4332,12 @@ dsc* evlGetContext(thread_db* tdbb, const SysFunction*, const NestValueArray& ar
return NULL;
resultStr = user.c_str();
}
else if (nameStr == SESSION_TIMEZONE)
{
char timeZoneBuffer[TimeZoneUtil::MAX_SIZE];
TimeZoneUtil::format(timeZoneBuffer, sizeof(timeZoneBuffer), attachment->att_current_timezone);
resultStr = timeZoneBuffer;
}
else
{
// "Context variable %s is not found in namespace %s"