an object-relational application is one in which a program written using an object-oriented language uses a relational database for storage and retrieval. A programmer must address one or more problems of an object-relational impedance mismatch during the production of an object-relational application...
It occurs in various aspects of database application programming. There are three concerns judged the most important: mismatching data models, mismatching binding times and mismatching object lifecycle. This paper focuses on the data model mismatch. We introduce the common state theory, i.e. a ...
Object relational mapping refers to the process of mapping your relational data model to your object model. Object Spaces is a highly publicized framework for doing just that. The mismatch I refer to is a result of the differences in structure between a normalized relational database and a typic...
was born ORM (object-relational mapping), out of necessity, and the complex challenge of saving the persistent state of an object environment in a relational database subsequently became known as the object-relational impedance mismatch.do... M Keith,R Stafford - 《Queue》 被引量: 9发表: 200...
The impedance mismatch effect in a two-layer (low density plastic foam, and solid aluminum, respectively) plane target compressed by a laser driven shock wave is considered. In such targets the ablative pressure generated by absorption of laser light in
In other words, the reflection coefficient S11 that is present at the directional coupler output may be the ratio of the vector amplitude, or electric field strength, of the reflected wave, which was caused by an impedance mismatch that is present on the transmission line, to the amplitude of...
functioning of the device 2 is the provision of a common mode rejection, since a large electromagnetic interference exists through the living being 6 being examined. Also, AC interference caused by the power supply network can cause large disturbances. Furthermore, there must be a mismatch of ...
If, on the other hand, the mismatch in impedances between the two materials is large, the quarter-wavelength matching layer no longer provides a practical solution. For example, if it is desired to match a typical piezoelectric transducer having an impedance of 34x106 Kg/m2.s to air having...
The phrase "impedance mismatch" is often used to characterize the difficulties in sharing data between the relational and object-oriented models. By harnessing the power of modern Relational Database Management Systems (RDBMS), an easy-to-implement, easy-to-use, persistent storage solution for Java...
Here impedance mismatch refers to clarity and performance difficulties that arise because of the nature of the embedding. Because of the central position in the information technology industry of object-oriented programs that access SQL-based relational database systems, reducing impedance mismatch is ...