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<hr><p>由 george 发布于: 2001-03-02 13:50</p><p> </p><p><font size =10 color = blue>2-tier and 3-tier Database Access Models</font><br>The JDBC provides support for 2-tier and 3-tier Database Access Models. WHen you use 2-tier access model, your java application talks directly to the database this is accomplished through the use of a JDBC dirver, which sends commands direactly to the database. THe results of these commands are then sent back from the database directly to the application.PLease see the following figure.<br><pre><br> |-----------------------------|<br> | Application Space |<br> | |----------------| |<br> | | Java app | |<br> | | | |<br> | | | |<br> | |----------------| |<br> | |----------------| | <br> | | | |<br> | | Jdbc driver | |<br> | |----------------| |<br> |-----------------------------|<br> | A<br>SQL Command| | Result set<br> | |<br> V |<br> |----------------|<br> | DataBase |<br> |----------------|<br></pre><br><br>The 3-tier model, as you might have guested, is a little more complicated, when you use the three tier midel, your JDBC driver sends commands to the database. The results of these commands are then sent back to the middle -tier, which communicates then back to the application.Just like the below:<br><pre><br> |-----------------------------|<br> | Application Space |<br> | |----------------| |<br> | | Java app | |<br> | | | |<br> | | | |<br> | |----------------| |<br> | |----------------| | <br> | | | |<br> | | Jdbc driver | |<br> | |----------------| |<br> |-----------------------------|<br> | A<br>SQL Command| | Result set<br> | |<br> V |<br> |----------------------------|<br> | Appication Server |<br> | (Webspher or VisualAge |<br> | test enviornmentsDataBase |<br> | |<br> |----------------------------|<br> | A<br> | | proprietary protocols<br> | |<br> V |<br> |----------------|<br> | DataBase |<br> |----------------|<br></pre><br>(followed by JDBC Driver Types)<br>How many kinds of JDBC driver in java?<br>Which one is most popular and is thought as the best one?<br>Whick kinds of driver sre there in Oralce Database?(you cannot find from books, tip: check the help documents of Oracle)<br><br><br>[已被 george 编辑过, 在 2001-03-02 16:39]<br><br>[已被 webmaster 编辑过, 在 2001-03-03 09:07]<br><br>[已被 webmaster 编辑过, 在 2001-03-03 09:15]</p></td>
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