--
DROP TABLE IF EXISTS `issues`;
-CREATE TABLE `issues` (
- `borrowernumber` int(11),
- `itemnumber` int(11),
- `date_due` date default NULL,
- `branchcode` varchar(10) default NULL,
+CREATE TABLE `issues` ( -- information related to check outs or issues
+ `borrowernumber` int(11), -- foreign key, linking this to the borrowers table for the patron this item was checked out to
+ `itemnumber` int(11), -- foreign key, linking this to the items table for the item that was checked out
+ `date_due` date default NULL, -- date the item is due (yyyy-mm-dd)
+ `branchcode` varchar(10) default NULL, -- foreign key, linking to the branches table for the location the item was checked out
`issuingbranch` varchar(18) default NULL,
- `returndate` date default NULL,
- `lastreneweddate` date default NULL,
+ `returndate` date default NULL, -- date the item was returned, will be NULL until moved to old_issues
+ `lastreneweddate` date default NULL, -- date the item was last renewed
`return` varchar(4) default NULL,
- `renewals` tinyint(4) default NULL,
- `timestamp` timestamp NOT NULL default CURRENT_TIMESTAMP on update CURRENT_TIMESTAMP,
- `issuedate` date default NULL,
- PRIMARY KEY (`itemnumber`),
+ `renewals` tinyint(4) default NULL, -- lists the number of times the item was renewed
+ `timestamp` timestamp NOT NULL default CURRENT_TIMESTAMP on update CURRENT_TIMESTAMP, -- the date and time this record was last touched
+ `issuedate` date default NULL, -- date the item was checked out or issued
KEY `issuesborridx` (`borrowernumber`),
KEY `bordate` (`borrowernumber`,`timestamp`),
CONSTRAINT `issues_ibfk_1` FOREIGN KEY (`borrowernumber`) REFERENCES `borrowers` (`borrowernumber`) ON DELETE RESTRICT ON UPDATE CASCADE,
--
DROP TABLE IF EXISTS `old_issues`;
-CREATE TABLE `old_issues` (
- `borrowernumber` int(11) default NULL,
- `itemnumber` int(11) default NULL,
- `date_due` date default NULL,
- `branchcode` varchar(10) default NULL,
+CREATE TABLE `old_issues` ( -- lists items that were checked out and have been returned
+ `borrowernumber` int(11) default NULL, -- foreign key, linking this to the borrowers table for the patron this item was checked out to
+ `itemnumber` int(11) default NULL, -- foreign key, linking this to the items table for the item that was checked out
+ `date_due` date default NULL, -- date the item is due (yyyy-mm-dd)
+ `branchcode` varchar(10) default NULL, -- foreign key, linking to the branches table for the location the item was checked out
`issuingbranch` varchar(18) default NULL,
- `returndate` date default NULL,
- `lastreneweddate` date default NULL,
+ `returndate` date default NULL, -- date the item was returned
+ `lastreneweddate` date default NULL, -- date the item was last renewed
`return` varchar(4) default NULL,
- `renewals` tinyint(4) default NULL,
- `timestamp` timestamp NOT NULL default CURRENT_TIMESTAMP on update CURRENT_TIMESTAMP,
- `issuedate` date default NULL,
+ `renewals` tinyint(4) default NULL, -- lists the number of times the item was renewed
+ `timestamp` timestamp NOT NULL default CURRENT_TIMESTAMP on update CURRENT_TIMESTAMP, -- the date and time this record was last touched
+ `issuedate` date default NULL, -- date the item was checked out or issued
KEY `old_issuesborridx` (`borrowernumber`),
KEY `old_issuesitemidx` (`itemnumber`),
KEY `old_bordate` (`borrowernumber`,`timestamp`),