March 2022
Intermediate to advanced
682 pages
22h 58m
English
Content preview from Databases Illuminated, 4th Edition
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9.5 Object Query Language (OQL)
OQL uses a syntax that is similar to SQL, but it operates on objects, not tables. One form for queries is
Although the syntax is similar to SQL, there are some important differences. The expression list may contain the names of attributes of objects, identified by using dot notation, as in
The use of dot notation invokes the default get() method for the attributes named in the SELECT line. The result will be the values of pId and credits for each of the Student instances in the Students extent.
In addition to attributes, ...
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