C # ADO database access What I want to talk about in this section is something that everyone cares about and is certainly very interested in. hey hey, it's also the best part of my tutorial-ADO database access. this reminds me of the 'database access' series I wrote last year! So, if you think it is hard to understand the record set or something like that, I recommend you read my articles first. Well, let's get started! What is ADO (ActiveX Data Objects translated as ActiveX Data Objects), ADO is a very simple idea, an idea that allows you to access Data in only one way. ADO is not a new idea. It only uses the existing data access technology to integrate it. if you don't understand ADO, think about ODBC! In fact, we used ADO when we were engaged in ASP. Remember the set conn = Server that we used countless times. createObject ('ADODB. connection? Yes, it is. for some conceptual items of ADO, please refer to the materials on your own. However, it doesn't matter if you don't know it. Just think of it as a tool for accessing data from M $! OK. The following example is based on a database of M $ ACCESS 2000. Its structure is as follows. The table name is Categories and the file name is BugTypes. mdb. Please create one quickly:
Okay. I will write all the programs first, and then let's try it with one sentence: The output in this example is: Found data table Categories CategoryName [1] is Bugbash stuff |
(previously 'DEVELOPER') Private forum for registered community members. To register, please visit www.prison-architect.com/register. Mac OS X Mac OS X 10.1.2 10.1.1 nov 13, 2001 dec 20, 2001 Solaris 8 10/01 october 2001 Mac OS X Mac OS X Server 10.1.1 Server 10.1 november september 29, 2001 21, 2001 Solaris 9 EA october 2, 2001 Tru64 Unix V5.1A september 2001. IRIX 6.5.11 february 2, 2001. IRIX 6.5.12 may 9, 2001 OpenServer 5.0.6a june 8, 2001. I'm not sure about Mac OS X. In the discussion on Hacker News they say OS X client doesn't use bash at all. Another vector could be sshd. But the attack require authentication. So, unless you are running some ssh service like a git server you should be safe.
Bouncy ball game mac os. The bash
version that comes with Mac OS Sierra is still the old v3
dated back in 2007.
GNU bash v4
has been introduced since 2009 that includes many new features, e.g. one of which is the shell option globstar **
that we used to recursively traverse directory hierarchy.
GET GNU bash
We can get it with homebrew
.
homebrew GNU bash
looks good with version v4.4.12
. Let's install:
Check if our GNU bash
is now the default one:
Make sure /usr/local/bin/bash
is at the top of the list. If it isn't and /bin/bash
is at the top, edit your .bashrc
or .bash_profile
to have the proper $PATH
setting:
Our terminal bash
should now be the GNU bash v4.4.12
:
And we're done.
Issue
… well, not quite. Even though most of everything we do now on our terminal
will run through the GNU bash
thanks to the proper $PATH
pointing to the correct version, our shell environment is still not fully set up properly.
E.g. we'll run to an error when trying to change a shell option:
Our version is bash v4.4.12
and it supports the globstar
option. Why did we get the error when setting it? It's simply because even though our $PATH
points to the correct GNU bash
, there are other things going on when the terminal
loads up our shell environment. So besides $PATH
, we need to make sure our shell environment is loaded up properly as well.
We have 2 places to do that on our Mac. Chemically bonded (itch) mac os.
OPTION 1: terminal
DEFAULT
terminal
is an Mac app that wraps our shell. By default terminal
will run /bin/bash
when it opens, but we can configure it to use GNU bash
instead.
Go to Terminal > Preferences > Shell opens with, and choose the 2nd option Command (complete path) with the value /usr/local/bin/bash as follows:
This tells the terminal app
to run our CommandGNU bash
instead of the Default login shell/bin/bash
when it opens.
Magnetic fieldball mac os. Completely quit and then re-open terminal
so it uses /usr/local/bin/bash
, we can then change the shell option without any issue:
OPTION 2: DEFAULT LOGIN SHELL
For most people, the terminal
option should be sufficient. However there are cases when you execute some shell script and even though your $PATH
and terminal
is set properly to use GNU bash
, somehow the shell script complains about the default shell /bin/bash
, where does it come from?
It comes from the shell environment variable $SHELL
that is set by Mac OS for your user. Even with $PATH
and terminal
set to use /usr/local/bin/bash
, $SHELL
still has the /bin/bash
value:
The discrepancy between our $PATH
/terminal
and $SHELL
:
As you may have guessed, in our terminal
's preferences, the Shell opens with's default option Default login shell was actually using the value of $SHELL
.
We can change the value of $SHELL
with the change shell command chsh
.
First-attempt to change default shell to use GNU bash
chsh
reported back with the error non-standard shell, that is because we tried to set the GNU bash as the default login shell but it's not in the list of valid shells as specified in /etc/shells
:
Make sure /usr/local/bin/bash
is at the top of the list. If it isn't and /bin/bash
is at the top, edit your .bashrc
or .bash_profile
to have the proper $PATH
setting:
Our terminal bash
should now be the GNU bash v4.4.12
:
And we're done.
Issue
… well, not quite. Even though most of everything we do now on our terminal
will run through the GNU bash
thanks to the proper $PATH
pointing to the correct version, our shell environment is still not fully set up properly.
E.g. we'll run to an error when trying to change a shell option:
Our version is bash v4.4.12
and it supports the globstar
option. Why did we get the error when setting it? It's simply because even though our $PATH
points to the correct GNU bash
, there are other things going on when the terminal
loads up our shell environment. So besides $PATH
, we need to make sure our shell environment is loaded up properly as well.
We have 2 places to do that on our Mac. Chemically bonded (itch) mac os.
OPTION 1: terminal
DEFAULT
terminal
is an Mac app that wraps our shell. By default terminal
will run /bin/bash
when it opens, but we can configure it to use GNU bash
instead.
Go to Terminal > Preferences > Shell opens with, and choose the 2nd option Command (complete path) with the value /usr/local/bin/bash as follows:
This tells the terminal app
to run our CommandGNU bash
instead of the Default login shell/bin/bash
when it opens.
Magnetic fieldball mac os. Completely quit and then re-open terminal
so it uses /usr/local/bin/bash
, we can then change the shell option without any issue:
OPTION 2: DEFAULT LOGIN SHELL
For most people, the terminal
option should be sufficient. However there are cases when you execute some shell script and even though your $PATH
and terminal
is set properly to use GNU bash
, somehow the shell script complains about the default shell /bin/bash
, where does it come from?
It comes from the shell environment variable $SHELL
that is set by Mac OS for your user. Even with $PATH
and terminal
set to use /usr/local/bin/bash
, $SHELL
still has the /bin/bash
value:
The discrepancy between our $PATH
/terminal
and $SHELL
:
As you may have guessed, in our terminal
's preferences, the Shell opens with's default option Default login shell was actually using the value of $SHELL
.
We can change the value of $SHELL
with the change shell command chsh
.
First-attempt to change default shell to use GNU bash
chsh
reported back with the error non-standard shell, that is because we tried to set the GNU bash as the default login shell but it's not in the list of valid shells as specified in /etc/shells
:
Second-attempt to change default shell to use GNU bash
Add GNU bash
to the list of acceptable shells:
/usr/local/bin/bash
is now in the acceptable shell list, let's change our default shell again:
Check that our shell is now the GNU bash
:
Another way to check if our $SHELL
has been property set is to run the chsh
command without any argument which will present an editable view of our user configuration:
Bug Bash Gbjam5 Mac Os X
We can then exit without saving once we've verified that our shell is /usr/local/bin/bash
.
You should logout and re-login for Mac to properly update your shell environment.
RECAP
- Install
GNU bash
withhomebrew
- Configure proper
$PATH
- Configure
terminal
to properly load the shell environment with either:- Choosing Command (complete path) with value
/usr/local/bin/bash
- Choosing Default login shell after setting
$SHELL
withchsh
to use/usr/local/bin/bash
- Choosing Command (complete path) with value
Bug Bash Gbjam5 Mac Os Update
Updated 5/16/17 for Mac Sierra 10.12.4