RE: Second Request - Limit Filed Input
Shankar Unni writes:
I don't see implementation of "CHECK" CONSTRAINTS in the TODO list (e.g.
CONSTRAINT val_ck check (val = 0 and val =5)
Is this planned?
I do see FOREIGN KEY constraints on the 4.0 list, so there is a way to do
this kind of checking once this is implemented:
* Create an associated "range-check" table with a primary key column, and
add rows for the values you want to allow in your table column.
* Put a foreign key constraint on your column to point at that table.
This will at least ensure that you get a constraint violation if you attempt
to insert something illegal.
This works only for small ranges or other enumeration types (integer or
string). E.g.
create table check_phase_number (phase integer);
insert into check_phase_number values (1),(2),(3),(4),(5);
create table check_state_abbrev (state char(2));
insert into check_state_abbrev values ('AK'),('AL'),('CA'), ...
('VT'),('WA');
create table my_state_migration (
phase integer constraint phase_fk foreign key references
check_phase_number(phase),
state char(2) constraint state_fk foreign key references
check_state_abbrev(state),
...
);
Hi!
We shall definitely consider putting it in 4.* branch.
Regards,
Sinisa
__ _ _ ___ == MySQL AB
/*/\*\/\*\ /*/ \*\ /*/ \*\ |*| Sinisa Milivojevic
/*/ /*/ /*/ \*\_ |*| |*||*| mailto:[EMAIL PROTECTED]
/*/ /*/ /*/\*\/*/ \*\|*| |*||*| Larnaca, Cyprus
/*/ /*/ /*/\*\_/*/ \*\_/*/ |*|
/*/^^^\*\^^^
/*/ \*\Developers Team
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RE: Second Request - Limit Filed Input
I don't see implementation of "CHECK" CONSTRAINTS in the TODO list (e.g.
CONSTRAINT val_ck check (val = 0 and val =5)
Is this planned?
I do see FOREIGN KEY constraints on the 4.0 list, so there is a way to do
this kind of checking once this is implemented:
* Create an associated "range-check" table with a primary key column, and
add rows for the values you want to allow in your table column.
* Put a foreign key constraint on your column to point at that table.
This will at least ensure that you get a constraint violation if you attempt
to insert something illegal.
This works only for small ranges or other enumeration types (integer or
string). E.g.
create table check_phase_number (phase integer);
insert into check_phase_number values (1),(2),(3),(4),(5);
create table check_state_abbrev (state char(2));
insert into check_state_abbrev values ('AK'),('AL'),('CA'), ...
('VT'),('WA');
create table my_state_migration (
phase integer constraint phase_fk foreign key references
check_phase_number(phase),
state char(2) constraint state_fk foreign key references
check_state_abbrev(state),
...
);
-Original Message-
From: Cal Evans [mailto:[EMAIL PROTECTED]]
Sent: Tuesday, March 20, 2001 8:27 AM
To: [EMAIL PROTECTED]; [EMAIL PROTECTED]
Subject: RE: Second Request - Limit Filed Input
you can use either an ENUM or a SET. Other than that, no.
Cal
http://www.calevans.com
-Original Message-
From: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED]]
Sent: Tuesday, March 20, 2001 10:05 AM
To: [EMAIL PROTECTED]
Subject: Second Request - Limit Filed Input
Is there a way in MySQL to limit the values that a (numeric) field can hold.
For example if I want a given field to only have the values 1 - 10 can I do
this and can it be done in the definition of the field when the table is
created?
-
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RE: Second Request - Limit Filed Input
Hi. You can use an ENUM column type assuming the numerical range is less than 65535 numbers. http://www.mysql.com/doc/E/N/ENUM.html -ravi. -Original Message- From: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED]] Sent: Tuesday, March 20, 2001 11:05 AM To: [EMAIL PROTECTED] Subject: Second Request - Limit Filed Input Is there a way in MySQL to limit the values that a (numeric) field can hold. For example if I want a given field to only have the values 1 - 10 can I do this and can it be done in the definition of the field when the table is created? - Before posting, please check: http://www.mysql.com/manual.php (the manual) http://lists.mysql.com/ (the list archive) To request this thread, e-mail [EMAIL PROTECTED] To unsubscribe, e-mail [EMAIL PROTECTED] Trouble unsubscribing? Try: http://lists.mysql.com/php/unsubscribe.php - Before posting, please check: http://www.mysql.com/manual.php (the manual) http://lists.mysql.com/ (the list archive) To request this thread, e-mail [EMAIL PROTECTED] To unsubscribe, e-mail [EMAIL PROTECTED] Trouble unsubscribing? Try: http://lists.mysql.com/php/unsubscribe.php
RE: Second Request - Limit Filed Input
you can use either an ENUM or a SET. Other than that, no. Cal http://www.calevans.com -Original Message- From: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED]] Sent: Tuesday, March 20, 2001 10:05 AM To: [EMAIL PROTECTED] Subject: Second Request - Limit Filed Input Is there a way in MySQL to limit the values that a (numeric) field can hold. For example if I want a given field to only have the values 1 - 10 can I do this and can it be done in the definition of the field when the table is created? - Before posting, please check: http://www.mysql.com/manual.php (the manual) http://lists.mysql.com/ (the list archive) To request this thread, e-mail [EMAIL PROTECTED] To unsubscribe, e-mail [EMAIL PROTECTED] Trouble unsubscribing? Try: http://lists.mysql.com/php/unsubscribe.php - Before posting, please check: http://www.mysql.com/manual.php (the manual) http://lists.mysql.com/ (the list archive) To request this thread, e-mail [EMAIL PROTECTED] To unsubscribe, e-mail [EMAIL PROTECTED] Trouble unsubscribing? Try: http://lists.mysql.com/php/unsubscribe.php
RE: Second Request - Limit Filed Input
At 11:22 AM 3/20/2001 -0500, Ravi Raman wrote:
You can use an ENUM column type assuming the numerical range is less than
65535 numbers.
http://www.mysql.com/doc/E/N/ENUM.html
One problem I've seen with enums is that I end up with a blank ('') field
if I try to insert a row with a value in the enum column that doesn't fit.
Is there a way to get the insert to fail on "bad input" instead?
For example:
mysql CREATE TABLE Stats (
- Status enum('good','bad') NOT NULL
- );
Query OK, 0 rows affected (0.00 sec)
mysql INSERT INTO Stats VALUES ('neither');
Query OK, 1 row affected (0.00 sec)
(Can I get this insert to FAIL instead? because...)
mysql select * FROM Stats;
++
| Status |
++
||
++
1 row in set (0.01 sec)
(this isn't always a good thing).
-bill
-
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RE: Second Request - Limit Filed Input
Hi.
It's kind of counter-intuitive to me as well, but the rationale is that
there obviously was an error if you have a "" value for an ENUM column. this
theoretically allows you at some later time to use that indicator to do some
sort of error-check or update/delete all erroneous rows, or whatever you
decide to do.
...in other words, it's a feature, not a bug.
-ravi.
-Original Message-
From: Bill Marrs [mailto:[EMAIL PROTECTED]]
Sent: Tuesday, March 20, 2001 12:48 PM
To: [EMAIL PROTECTED]
Subject: RE: Second Request - Limit Filed Input
At 11:22 AM 3/20/2001 -0500, Ravi Raman wrote:
You can use an ENUM column type assuming the numerical range is less than
65535 numbers.
http://www.mysql.com/doc/E/N/ENUM.html
One problem I've seen with enums is that I end up with a blank ('') field
if I try to insert a row with a value in the enum column that doesn't fit.
Is there a way to get the insert to fail on "bad input" instead?
For example:
mysql CREATE TABLE Stats (
- Status enum('good','bad') NOT NULL
- );
Query OK, 0 rows affected (0.00 sec)
mysql INSERT INTO Stats VALUES ('neither');
Query OK, 1 row affected (0.00 sec)
(Can I get this insert to FAIL instead? because...)
mysql select * FROM Stats;
++
| Status |
++
||
++
1 row in set (0.01 sec)
(this isn't always a good thing).
-bill
-
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RE: Second Request - Limit Filed Input
Yes, but it makes it hard to track down who/what piece of code entered
those bad values. You just have to clean them up later and wonder.
Not the end of the world, but I have some cases where I'd rather fail and
deal with the error at time of input (have them re-enter or whatever).
thanks
-bill
At 01:52 PM 3/20/2001 -0500, Ravi Raman wrote:
It's kind of counter-intuitive to me as well, but the rationale is that
there obviously was an error if you have a "" value for an ENUM column. this
theoretically allows you at some later time to use that indicator to do some
sort of error-check or update/delete all erroneous rows, or whatever you
decide to do.
...in other words, it's a feature, not a bug.
-ravi.
-Original Message-
From: Bill Marrs [mailto:[EMAIL PROTECTED]]
Sent: Tuesday, March 20, 2001 12:48 PM
To: [EMAIL PROTECTED]
Subject: RE: Second Request - Limit Filed Input
At 11:22 AM 3/20/2001 -0500, Ravi Raman wrote:
You can use an ENUM column type assuming the numerical range is less than
65535 numbers.
http://www.mysql.com/doc/E/N/ENUM.html
One problem I've seen with enums is that I end up with a blank ('') field
if I try to insert a row with a value in the enum column that doesn't fit.
Is there a way to get the insert to fail on "bad input" instead?
For example:
mysql CREATE TABLE Stats (
- Status enum('good','bad') NOT NULL
- );
Query OK, 0 rows affected (0.00 sec)
mysql INSERT INTO Stats VALUES ('neither');
Query OK, 1 row affected (0.00 sec)
(Can I get this insert to FAIL instead? because...)
mysql select * FROM Stats;
++
| Status |
++
||
++
1 row in set (0.01 sec)
(this isn't always a good thing).
-bill
-
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http://www.mysql.com/manual.php (the manual)
http://lists.mysql.com/ (the list archive)
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