Mysql: How to swap data of one column between rows? - php

I already read Switch id numbers of two rows in MySql and Mysql: Swap data for different rows, yet I don't understand. Suppose a table colors that looks like this:
------------------------------------------
| id | box | pouch | color | value |
-----------------------------------------
| 1 | 1 | 1 | red | 30 |
| 2 | 1 | 1 | blue | 20 |
| 3 | 1 | 1 | green | 10 |
| 4 | 1 | 1 | yellow | 40 |
| 5 | 1 | 1 | purple | 20 |
| 6 | 1 | 1 | black | 50 |
| 7 | 1 | 2 | red | 30 |
| 8 | 1 | 2 | blue | 20 |
| 9 | 1 | 2 | green | 10 |
| 10 | 1 | 2 | yellow | 40 |
| 11 | 1 | 2 | purple | 20 |
| 12 | 1 | 2 | black | 50 |
| 13 | 2 | 1 | red | 35 |
| 14 | 2 | 1 | blue | 25 |
| 15 | 2 | 1 | green | 15 |
| 16 | 2 | 1 | yellow | 45 |
| 17 | 2 | 1 | purple | 25 |
| 18 | 2 | 1 | black | 55 |
| 19 | 2 | 2 | red | 35 |
| 20 | 2 | 2 | blue | 25 |
| 21 | 2 | 2 | green | 15 |
| 22 | 2 | 2 | yellow | 45 |
| 23 | 2 | 2 | purple | 25 |
| 24 | 2 | 2 | black | 55 |
------------------------------------------
How can I swap the "value" of a row with another, leaving the "id", "box", "pouch", and "color" intact?
Notes:
1. I need to swap the value of box='1' with box='2'
2. The number of rows are dynamic
Example:
SWAP ROWS OF VALUE WITH BOX='1' WITH ROWS OF VALUE WITH BOX='2'
Result:
------------------------------------------
| id | box | pouch | color | value |
-----------------------------------------
| 1 | 1 | 1 | red | 35 |
| 2 | 1 | 1 | blue | 25 |
| 3 | 1 | 1 | green | 15 |
| 4 | 1 | 1 | yellow | 45 |
| 5 | 1 | 1 | purple | 25 |
| 6 | 1 | 1 | black | 55 |
| 7 | 1 | 2 | red | 35 |
| 8 | 1 | 2 | blue | 25 |
| 9 | 1 | 2 | green | 15 |
| 10 | 1 | 2 | yellow | 45 |
| 11 | 1 | 2 | purple | 25 |
| 12 | 1 | 2 | black | 55 |
| 13 | 2 | 1 | red | 30 |
| 14 | 2 | 1 | blue | 20 |
| 15 | 2 | 1 | green | 10 |
| 16 | 2 | 1 | yellow | 40 |
| 17 | 2 | 1 | purple | 20 |
| 18 | 2 | 1 | black | 50 |
| 19 | 2 | 2 | red | 30 |
| 20 | 2 | 2 | blue | 20 |
| 21 | 2 | 2 | green | 10 |
| 22 | 2 | 2 | yellow | 40 |
| 23 | 2 | 2 | purple | 20 |
| 24 | 2 | 2 | black | 50 |
------------------------------------------
Anyone got some ideas? Thanks

Create a table that holds all values you want to swap.
create table tmp_t as select * from t;
Then update your table twice:
update t t1
inner join tmp_t t2 on t1.color = t2.color
and t1.pouch = t2.pouch
and t1.box = 1 and t2.box = 2
set t1.value = t2.value;
update t t1
inner join tmp_t t2 on t1.color = t2.color
and t1.pouch = t2.pouch
and t1.box = 2 and t2.box = 1
set t1.value = t2.value;
And that's it. See it working live in an sqlfiddle.

To do the swap, try resetting one of them to a temporary value. You need to do that, otherwise the second update will affect the first one.
UPDATE mytable SET box = -1 WHERE box = 1; -- Set box 1 to a temporary value
UPDATE mytable SET box = 1 WHERE box = 2; -- Set box 2 to box 1
UPDATE mytable SET box = 2 WHERE box = -1; -- Set box 1 to box 2
I've assumed it is not possible to have a negative box number. If -1 is permissible, use something else, such as null.
For extra safety, wrap the above in a transaction, so if anything goes wrong, you can rollback.

Related

Create tournament fixture lists

I need help to figure out how to solve this:
We are trying to create a fixture list for a tournament, below you will find a table generated by a webinterface we have. (Not sure if this is the ideal layout to make the fixture list, but I may do changes to what we store and use as a basis for the task below).
The tournament concept is with x number of courts in the same location. So we would like to have court utilization as close to 100% as possible.
The problem is to generate the fixture list itself based on this table without conflicts( a team plays 2 games in same round) and also to have the best utilization of the courts.
Explanation of the concept:
Tournament_id is the id of the main tournament.
Then we have sub tournaments, and they are identified by pool_id. Then each pool may have several groups which play round robin (single/double) group_id.
We have already done the setup of games so the teams playing each other are located in home and visit, and the round within the group is indicated by round. This means if a group has 2 games in round 1 this is the maximum games that can be played in this group for this round, if only one game the maximum is 1.
priority is used as this:
Equal priority means the games should be handled together during creation of fixture list. In the example pool_id=23 has 3 groups, 0,1,2. 1 and 2 has priority 1, and 0 has priority 2.
This means the games for group 0 cannot be played before the games in priority 1 for groups 1 and 2 has been played. (it is used to keep control inside each pool.)
The number of courts in the tournament is known at this stage and for this example it's 4.
I would like to be able to generate the fixture list in 2 different ways:
1: We use the courts column and assign to correct court.
2: We do not use the courts column, and assign games to next available court.
I would like to have an array which I can loop through to make the fixture list, game by game, round by round with indication of the court it is assigned.
mysql> select * from tournament_games where tournament_id=7 order by priority,round,fetch_order;
+---------------+---------+----------+-------+------+-------+--------+----------+-------------+-----------------------+
| tournament_id | pool_id | group_id | round | home | visit | courts | priority | fetch_order | gametype |
+---------------+---------+----------+-------+------+-------+--------+----------+-------------+-----------------------+
| 7 | 20 | 1 | 1 | 156 | 49 | 4 | 1 | 1 | |
| 7 | 20 | 2 | 1 | 80 | 71 | 3 | 1 | 2 | |
| 7 | 18 | 1 | 1 | 69 | 64 | 3-4 | 1 | 4 | |
| 7 | 18 | 1 | 1 | 68 | 65 | 3-4 | 1 | 4 | |
| 7 | 23 | 1 | 1 | 155 | 50 | 1 | 1 | 5 | |
| 7 | 23 | 2 | 1 | 153 | 100 | 2 | 1 | 6 | |
| 7 | 20 | 1 | 2 | 49 | 79 | 4 | 1 | 1 | |
| 7 | 20 | 2 | 2 | 71 | 74 | 3 | 1 | 2 | |
| 7 | 18 | 1 | 2 | 64 | 68 | 3-4 | 1 | 4 | |
| 7 | 18 | 1 | 2 | 69 | 65 | 3-4 | 1 | 4 | |
| 7 | 23 | 1 | 2 | 50 | 99 | 1 | 1 | 5 | |
| 7 | 23 | 2 | 2 | 100 | 151 | 2 | 1 | 6 | |
| 7 | 20 | 1 | 3 | 156 | 79 | 4 | 1 | 1 | |
| 7 | 20 | 2 | 3 | 74 | 80 | 3 | 1 | 2 | |
| 7 | 18 | 1 | 3 | 65 | 64 | 3-4 | 1 | 4 | |
| 7 | 18 | 1 | 3 | 69 | 68 | 3-4 | 1 | 4 | |
| 7 | 23 | 1 | 3 | 155 | 99 | 1 | 1 | 5 | |
| 7 | 23 | 2 | 3 | 153 | 151 | 2 | 1 | 6 | |
| 7 | 20 | 1 | 4 | 49 | 156 | 4 | 1 | 1 | |
| 7 | 18 | 1 | 4 | 65 | 68 | 3-4 | 1 | 4 | |
| 7 | 18 | 1 | 4 | 64 | 69 | 3-4 | 1 | 4 | |
| 7 | 23 | 1 | 4 | 50 | 155 | 1 | 1 | 5 | |
| 7 | 23 | 2 | 4 | 100 | 153 | 2 | 1 | 6 | |
| 7 | 20 | 1 | 5 | 79 | 49 | 4 | 1 | 1 | |
| 7 | 18 | 1 | 5 | 65 | 69 | 3-4 | 1 | 4 | |
| 7 | 18 | 1 | 5 | 68 | 64 | 3-4 | 1 | 4 | |
| 7 | 23 | 1 | 5 | 50 | 99 | 1 | 1 | 5 | |
| 7 | 23 | 2 | 5 | 100 | 151 | 2 | 1 | 6 | |
| 7 | 20 | 1 | 6 | 79 | 156 | 4 | 1 | 1 | |
| 7 | 18 | 1 | 6 | 69 | 68 | 3-4 | 1 | 4 | |
| 7 | 18 | 1 | 6 | 65 | 64 | 3-4 | 1 | 4 | |
| 7 | 23 | 1 | 6 | 99 | 155 | 1 | 1 | 5 | |
| 7 | 23 | 2 | 6 | 151 | 153 | 2 | 1 | 6 | |
| 7 | 20 | 0 | 1 | 0 | 0 | 3-4 | 2 | 3 | partidos de posición |
| 7 | 20 | 0 | 1 | 0 | 0 | 3-4 | 2 | 3 | partidos de posición |
| 7 | 20 | 0 | 1 | 0 | 0 | 3-4 | 2 | 3 | partidos de posición |
| 7 | 20 | 0 | 1 | 0 | 0 | 3-4 | 2 | 3 | partidos de posición |
| 7 | 23 | 0 | 1 | 0 | 0 | 1-2 | 2 | 7 | semifinales |
| 7 | 23 | 0 | 1 | 0 | 0 | 1-2 | 2 | 7 | semifinales |
| 7 | 23 | 0 | 2 | 0 | 0 | 1-2 | 2 | 7 | final y perdedor |
| 7 | 23 | 0 | 2 | 0 | 0 | 1-2 | 2 | 7 | final y perdedor |
+---------------+---------+----------+-------+------+-------+--------+----------+-------------+-----------------------+
41 rows in set (0.00 sec)
Anyone with any suggestions on how to go about solving this?
regards, Roar

Query MySQL To Show Counting from the table relation

i have 3 tables. 2 reference table and one table transactions.
Table puskesmas
mysql> select id,nama from puskesmas;
+----+----------------------+
| id | nama |
+----+----------------------+
| 1 | BAMBANGLIPURO |
| 2 | BANGUNTAPAN |
| 3 | BANTUL |
| 4 | DLINGO |
| 5 | IMOGIRI |
| 6 | JETIS |
| 7 | KASIHAN |
| 8 | KRETEK |
| 9 | PAJANGAN |
| 10 | PANDAK |
+----+----------------------+
Table poli
mysql> select * from poli;
+----+---------------+
| id | nama |
+----+---------------+
| 1 | BP |
| 2 | KIA |
| 3 | GIGI |
| 4 | JIWA |
+----+---------------+
Table loket
mysql> select pasien_id,poli_id,puskesmas_id from loket limit 10;
+-----------+---------+--------------+
| pasien_id | poli_id | puskesmas_id |
+-----------+---------+--------------+
| 1 | 1 | 1 |
| 5 | 2 | 2 |
| 1 | 1 | 3 |
| 9 | 3 | 4 |
| 1 | 3 | 5 |
| 5 | 2 | 1 |
| 1 | 1 | 3 |
| 8 | 1 | 2 |
| 10 | 3 | 6 |
| 5 | 2 | 5 |
+-----------+---------+--------------+
I want to show the total number (count) of visits to puskesmas table. then made field all_total
fter that I want to take patient visits where poli_id = 1 and used as a column bp. for other poly are the same as the
+----+----------------------+--------------+------+------+------+------+
| id | nama | All Total | BP | KIA | GIGI | JIWA |
+----+----------------------+--------------+------+------+------+------+
| 1 | BAMBANGLIPURO | 30 | 10 | 3 | 15 | 2 |
| 2 | BANGUNTAPAN | 35 | 20 | 4 | 11 | 0 |
| 3 | BANTUL | 15 | 10 | 0 | 5 | 0 |
| 4 | DLINGO | 12 | 10 | 1 | 1 | 0 |
| 5 | IMOGIRI | 10 | 5 | 2 | 1 | 2 |
| 6 | JETIS | 25 | 13 | 3 | 7 | 2 |
| 7 | KASIHAN | 20 | 10 | 10 | 0 | 0 |
| 8 | KRETEK | 23 | 20 | 1 | 1 | 1 |
| 9 | PAJANGAN | 10 | 5 | 1 | 3 | 1 |
| 10 | PANDAK | 0 | 0 | 0 | 0 | 0 |
+----+----------------------+--------------+------+------+------+------+
I've tried to make a query to display like this but it always fails to hold. Can anyone help to make such queries desired results
i have tried query like this :
select puskesmas_id,
sum(case when poli_id=1 then 1 else 0 end) bp,
sum(case when poli_id=5 then 0 else 1 end) gigi,
count(id) total
from loket
group by puskesmas_id
and result like this :
+--------------+------+------+-------+
| puskesmas_id | bp | gigi | total |
+--------------+------+------+-------+
| 1 | 97 | 126 | 143 |
| 6 | 74 | 185 | 210 |
| 8 | 131 | 179 | 190 |
| 7 | 90 | 92 | 98 |
| 2 | 33 | 39 | 54 |
| 4 | 158 | 248 | 263 |
| 3 | 66 | 68 | 72 |
+--------------+------+------+-------+
but puskesmas_id the value 0 does not perform data when querying

yii: count value array depend on index group number

I have table from mysql like below:
id | name | grade | k1 | k2 | k3 | s1| s2 | s3| e1 | e1 | e3 |
1 | Aa | 5 | 1 | 0 | 5 | 3 | 2 | 1 | 0 | 6 | 1 |
2 | Bb | 1 | 1 | 3 | 5 | 3 | 5 | 3 | 4 | 6 | 1 |
3 | Cc | 2 | 1 | 4 | 2 | 2 | 2 | 4 | 0 | 6 | 1 |
4 | Dd | 4 | 1 | 3 | 5 | 3 | 3 | 1 | 0 | 6 | 1 |
5 | Ee | 3 | 1 | 5 | 2 | 1 | 0 | 5 | 0 | 6 | 1 |
6 | Ff | 2 | 1 | 3 | 1 | 3 | 4 | 2 | 0 | 6 | 1 |
7 | Gg | 5 | 1 | 1 | 5 | 5 | 2 | 1 | 0 | 6 | 1 |
Using FOR and FOREACH looping, i do able to show all row. But in final view/table i want to
SUM [k1,k2,k3], SUM[s1,s2,s3] and SUM[e1,e2,e3]
So it will place new colum as K, S and E in each row.
Here are my code:
for ($i = 0; $i < Evaluation::model()->count(); $i++) {
foreach (Yii::app()->db->createCommand()
->from('evaluation')
->queryAll() as $item) {
// Row-Column start here
// id | name | grade | K | S | E |
}
}
thanks.
I love the query builder. So here is one of the solution.
$result = Yii::app()->db->createCommand()->
select('id, name, grade, (k1+k2+k3) AS K, (s1+s2+s3) AS S, (e1+e2+e3) AS E')->
from(MyModel::model()->tableName())->
queryAll();
var_dump($result);
select k1+k2+k3, s1+s2+s3, e1+e2+e3 from t
and it is not yii question, it is about MySql
If you want to express it in Yii, you can
Yii:app()->createCommands()
->select('k1+k2+k3, s1+s2+s3, e1+e2+e3')
->from('t')
->queryAll();

Selecting Total value of items from 2 tables and update value of another TABLE (COMPLICATED QUERY)

My case is that I want to compute a player atk power to be used on a battle module that i made, but just wondering i have actually 2 options:
Calculate Damage Dealt from the server.(my CURRENT OPTIONS)
use PHP to calculate DAMAGE DEALT and UPDATE server DATABASE values.
pass 2 of the chara id and just calculate all in the QUERY and UPDATE all(is this possible).
Question: Can I do it in a query?(option B)
my current set-up:
1 character has 4 items and i compute the characters atk by adding all 4 of the item atk and the chara base atk in the client side. (which i think is prone to security holes)
and then update the values in the server side.
Here is my tables:
chara:
+----------+------------+----------------+-------------+------------+----------+----------+----------+-----------+-----------+
| chara_id | chara_name | chara_class_id | chara_level | chara_gold | chara_hp | chara_mp | chara_xp | chara_atk | chara_def |
+----------+------------+----------------+-------------+------------+----------+----------+----------+-----------+-----------+
| 1 | LawrenceX | 1 | 5 | 230 | -175 | 1000 | 0 | 7 | 3 |
| 3 | Viscocent | 2 | 2 | 96 | -206 | 1100 | 1700 | 5 | 5 |
| 4 | Piatos | 1 | 1 | 120 | -60 | 1000 | 0 | 7 | 3 |
| 5 | Hello | 1 | 1 | 300 | -50 | 1000 | 200 | 2 | 8 |
| 6 | Sample | 3 | 2 | 251 | -85 | 900 | 0 | 9 | 1 |
| 8 | Sampuro | 2 | 1 | 170 | 895 | 1100 | 700 | 5 | 5 |
| 12 | fail | 2 | 3 | 481 | 1100 | 1300 | 0 | 21 | 9 |
| 13 | new | 1 | 1 | 1000 | -80 | 1000 | 0 | 5 | 5 |
+----------+------------+----------------+-------------+------------+----------+----------+----------+-----------+-----------+
items:
+---------+-----------------+-----------+----------+----------+----------+---------------------------------+-------------------------------------------------+------------+
| 0 | None | 0 | 0 | 0 | 0 | pics/none.png | | 400 |
| 1 | Axe | 1 | 220 | 10 | 0 | pics/weapons/axe.png | Another lumberjack axe is another man's weapon. | 200 |
| 2 | Wooden Sword | 1 | 70 | 0 | 0 | pics/weapons/wooden-sword.png | A wooden sword, 99% made from wood | 225 |
| 3 | Dagger | 1 | 60 | 5 | 0 | pics/weapons/dagger.png | A Dagger, Cheap and Sharp | 55 |
| 4 | Bow | 1 | 120 | 1 | 0 | pics/weapons/bow.png | The basics and simplest of all bows. | 120 |
| 5 | Helmet | 4 | 0 | 50 | 0 | pics/headgears/helmet.png | iron helmet - made from an iron pot scraps. | 155 |
| 6 | Tunic | 2 | 10 | 10 | 0 | pics/armors/tunic.png | A peasants tunic. | 50 |
| 7 | Armour | 2 | 0 | 75 | 0 | pics/armors/armour.png | | 150 |
| 8 | Necklace | 3 | 25 | 15 | 0 | pics/accessories/necklace.png | | 199 |
| 9 | Studded Leather | 2 | 25 | 60 | 0 | pics/armors/studded-leather.png | | 240 |
+---------+-----------------+-----------+----------+----------+----------+---------------------------------+-------------------------------------------------+------------+
equipment:
+----------+----------+-----------+-------------+----------+---------+
| equip_id | chara_id | weapon_id | headgear_id | armor_id | ring_id |
+----------+----------+-----------+-------------+----------+---------+
| 3 | 1 | 14 | 5 | 6 | 8 |
| 5 | 3 | 4 | 5 | 6 | 8 |
| 6 | 4 | 11 | 5 | 7 | 8 |
| 7 | 5 | 12 | 5 | 6 | 8 |
| 8 | 6 | 3 | 16 | 7 | 8 |
| 10 | 8 | 15 | 5 | 7 | 8 |
| 13 | 12 | 14 | 5 | 6 | 17 |
| 40 | 13 | 3 | 5 | 7 | 8 |
+----------+----------+-----------+-------------+----------+---------+
table relationships:
1 chara = 1 equipment
1 weapon_id, armor_id, ring_id, headgear_id = 1 item (total of 4 items, headgear_id = 1 item).
I CAN GET THE EQUIPMENTS OF A CHARACTER BY USING THIS QUERY(KUDOS #JC):
SELECT i1.item_atk weapon_atk,i1.item_def weapon_def,
i2.item_atk headgear_atk,
i2.item_def headgear_def,
i3.item_atk armor_atk,
i3.item_def armor_def,
i4.item_atk ring_atk,
i4.item_def ring_def
FROM equipment e LEFT JOIN
item i1 ON e.weapon_id = i1.item_id LEFT JOIN
item i2 ON e.headgear_id = i2.item_id LEFT JOIN
item i3 ON e.armor_id = i3.item_id LEFT JOIN
item i4 ON e.ring_id = i4.item_id
WHERE e.chara_id = 1
RESULTS:
+------------+------------+--------------+--------------+-----------+-----------+----------+----------+
| weapon_atk | weapon_def | headgear_atk | headgear_def | armor_atk | armor_def | ring_atk | ring_def |
+------------+------------+--------------+--------------+-----------+-----------+----------+----------+
| 275 | 25 | 0 | 50 | 10 | 10 | 25 | 15 |
+------------+------------+--------------+--------------+-----------+-----------+----------+----------+
now i want to total the atk and def of that character equipment and return it in that query
expected results:
+------------+------------+
| total_atk | total_def |
+------------+------------+
| 310 | 100 |
+------------+------------+
this is the simplest way that I can think of.
SELECT IFNULL(W.item_atk, 0) + IFNULL(H.item_atk, 0) + IFNULL(A.item_atk, 0) + IFNULL(R.item_atk, 0) AS total_atk
, IFNULL(W.item_def, 0) + IFNULL(H.item_def, 0) + IFNULL(A.item_def, 0) + IFNULL(R.item_def, 0) AS total_def
FROM equipment E
LEFT JOIN item W ON W.item_id = E.weapon_id
LEFT JOIN item H ON H.item_id = E.headgear_id
LEFT JOIN item A ON A.item_id = E.armor_id
LEFT JOIN item R ON R.item_id = E.ring_id
WHERE E.chara_id = 1
I have renamed the aliases of tables to track them easily. And I used IFNULL in case the character has no particular equipment.
==================================================================================
Dude, I just made another query, I think this is faster than the one above. Though, I haven't tested them.
SELECT SUM(IFNULL(I.item_atk, 0)) AS total_atk
, SUM(IFNULL(I.item_def, 0)) AS total_def
FROM equipment E
LEFT JOIN item I ON I.item_id = E.weapon_id
OR I.item_id = E.headgear_id
OR I.item_id = E.armor_id
OR I.item_id = E.ring_id
WHERE E.chara_id = 1
GROUP BY E.chara_id

swapping values in different tables if the data exist then value + 1 if data = 0 then delete

i have this table called bag:
+--------+----------+---------+----------+
| bag_id | chara_id | item_id | item_qty |
+--------+----------+---------+----------+
| 1 | 1 | 2 | 26 |
| 2 | 1 | 1 | 56 |
| 3 | 3 | 1 | 4 |
| 6 | 3 | 4 | 3 |
| 7 | 4 | 4 | 3 |
| 8 | 5 | 4 | 3 |
| 9 | 6 | 4 | 2 |
| 10 | 1 | 5 | 1 |
| 14 | 1 | 8 | 1 |
| 15 | 1 | 6 | 2 |
| 18 | 1 | 4 | 4 |
| 19 | 1 | 3 | 2 |
| 29 | 8 | 1 | 1 |
| 30 | 8 | 7 | 2 |
| 33 | 6 | 2 | 1 |
| 34 | 3 | 5 | 1 |
| 35 | 3 | 8 | 3 |
| 37 | 4 | 3 | 1 |
| 45 | 3 | 3 | 14 |
| 46 | 8 | 2 | 2 |
| 60 | 8 | 5 | 2 |
| 61 | 3 | 2 | 10 |
| 74 | 12 | 2 | 1 |
| 97 | 12 | 5 | 1 |
| 103 | 3 | 6 | 1 |
+--------+----------+---------+----------+
and have this table called equipment:
+----------+----------+-----------+-------------+----------+---------+
| equip_id | chara_id | weapon_id | headgear_id | armor_id | ring_id |
+----------+----------+-----------+-------------+----------+---------+
| 3 | 1 | 4 | 5 | 9 | 8 |
| 5 | 3 | 2 | 5 | 3 | 8 |
| 6 | 4 | 7 | 5 | 3 | 8 |
| 7 | 5 | 4 | 5 | 3 | 8 |
| 8 | 6 | 3 | 5 | 2 | 8 |
| 10 | 8 | 3 | 5 | 2 | 8 |
| 11 | 3 | 2 | 5 | 0 | 8 |
| 12 | 3 | 2 | 5 | 0 | 8 |
| 13 | 12 | 2 | 0 | 0 | 0 |
| 14 | 5 | 4 | 0 | 0 | 0 |
| 15 | 1 | 1 | 0 | 0 | 0 |
| 16 | 1 | 0 | 0 | 6 | 0 |
| 17 | 4 | 4 | 0 | 0 | 0 |
| 18 | 8 | 2 | 0 | 0 | 0 |
| 19 | 3 | 2 | 5 | 0 | 8 |
+----------+----------+-----------+-------------+----------+---------+
scenario:
player equips an item from the bag to equipment:
#unequipping:
1. if equipment id to be unequipped exist in the bag then that bag item = item + 1
else
insert that item to the bag
#equipping:
1. bag item = bag item - 1 where item_id = equipped item_id
else if bag item = 0 then delete it.
basically i want to swap the item's from the equipment to the bag table,
though the twist is the quantity, wherein if that item to be swapped is already existing in the bag table then + 1 to the quantity and if the item from the bag table is = 1 then remove that item from the table and equip that item to the equipment table.
please pm me if you couldn’t understand my situation, its driving me nuts!
this is my current code(if it helps a little):
$fieldnames = array(1=>'weapon', 'armor', 'ring', 'headgear');
if (isset($fieldnames[$equip->item_type])) {
$field = $fieldnames[$equip->item_type].'_id';
$sql_unequip = "INSERT INTO bag(item_id, chara_id, item_qty)VALUES(:item_id, :chara_id, 1) ON DUPLICATE KEY UPDATE item_qty = item_qty + 1";
$sql_equip = "UPDATE equipment SET $field = :item_id WHERE chara_id = :chara_id";
$sql_unequip2 = "DELETE FROM bag WHERE item_id = :item_id AND chara_id = :chara_id AND item_qty = 0";
}

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