Databases Reference
In-Depth Information
The browseable foreign-table window
Our current
author
table has very few entries. Thus, to illustrate this mechanism, we
will set the
$cfg['ForeignKeyMaxLimit']
to an artificially low number, 1. Now in
the
Insert
mode for the
book
table, we see a small table-shaped icon and a
Browse
foreign values
link for
author_id
column. This icon opens another window, which
will present the values of the
author
table and a
Search
input field. On the left, the
values are sorted by key value (here, the
id
column), and on the right, they are sorted
by description.
Choosing one of the values (by clicking either a key value or a description) closes this
window and brings the value back to the
author_id
column.
Referential integrity checks
We discussed the
Operations
page and its
Table maintenance
section in Chapter 9.
For this exercise, we suppose that both the
book
and
author
tables are not under
the control of the
InnoDB
or
PBXT
storage engine. If we have defined an internal
relation for the
author
table, a new choice appears for the
book
table—
Check
referential integrity
.
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