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JDBC Interview Questions

Q   |   QA

Make sure the resultset is updatable.

1. move the cursor to the specific position.

uprs.moveToCurrentRow();

2. set value for each column.

uprs.moveToInsertRow();//to set up for insert
uprs.updateString("col1" "strvalue");
uprs.updateInt("col2", 5);

3. call inserRow() method to finish the row insert process.

uprs.insertRow();

To delete a row: move to the specific position and call deleteRow() method:

uprs.absolute(5);
uprs.deleteRow();//delete row 5

To see the changes call refreshRow();

uprs.refreshRow();

One implementation interface for database manufacturers, the other implementation interface for application and applet writers. 

The ResultSet.getXXX methods are the only way to retrieve data from a ResultSet object, which means that you have to make a method call for each column of a row. It is unlikely that this is the cause of a performance problem, however, because it is difficult to see how a column could be fetched without at least the cost of a function call in any scenario. We welcome input from developers on this issue. 

This type of error occurs during an attempt to connect to a database with the bridge. First, note that the error is coming from the ODBC driver manager. This indicates that the bridge-which is a normal ODBC client-has successfully called ODBC, so the problem isn't due to native libraries not being present. In this case, it appears that the error is due to the fact that an ODBC DSN (data source name) needs to be configured on the client machine. Developers often forget to do this, thinking that the bridge will magically find the DSN they configured on their remote server machine 

JDBC Net pure Java driver(Type IV) is the fastest driver because it converts the jdbc calls into vendor specific protocol calls and it directly interacts with the database. 

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