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CHAPTER 13 JDBC and Java Data Objects
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value you want to retrieve The reference can be the name of the column or the column number We use the column name in this example The getString() method returns the value of the specified column We assign this value to the appropriate string variable declared previously in this program You can then use the variable as you use any other variable within your program In this example, the firstName and lastName variables are concatenated and assigned to the printRow variable, which is displayed on the screen Notice that we call the getString() method and display the printRow variable within a dowhile loop After data from the first row set is copied to variables and displayed, the next() method is called once again to determine whether the response from the DBMS contains another row of data If it does, the statements within the dowhile loop are executed again to retrieve data from the next row in the row set Otherwise, the program exits the dowhile loop
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String firstName; String lastName; String printrow; boolean records = resultsnext(); if (!records ) { Systemoutprintln( "No data returned"); return; } else { do { firstName = resultsgetString ('FirstName') ; lastName = resultsgetString ('LastName') ; printRow = firstName + " " + lastName; Systemoutprintln(printrow); } while ( resultsnext() ); }
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Terminate the Connection to the DBMS
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The fifth routine of the process is to close the instance of ResultSet and the connection to the DBMS You do this by calling the close() method, as shown here:
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resultclose(); bDclose();
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The instance of ResultSet is automatically closed when you close the connection to the DBMS; however, many programmers prefer to explicitly close the instance of ResultSet
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Trapping Exceptions
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Previous examples in this chapter did not address the likelihood that there could be exceptions when connecting to and interacting with a DBMS We purposely did this to keep the examples simple Now that you ve learned how to use the basic JDBC API, we ll turn our attention to handling exceptions Let s begin with loading the driver First, ClassforName() throws a ClassNot FoundException if anything unusual happens when the driver is being loaded You trap this exception by using a catch block, as shown in the following example When the catch block catches the ClassNotFoundException, the getMessage() method is called to retrieve the description of the exception, which is then displayed on the screen The exit() method is then called to terminate the program Notice that the exit() method is passed the integer 1 This value is returned to the operating system by the program when the program terminates, indicating that the program terminated abnormally because it couldn t load the driver
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try { ClassforName( "sunjdbcodbcJdbcOdbcDriver"); } catch (ClassNotFoundException e) { Systemerrprintln( "Unable to load the JDBC/ODBC bridge" + egetMessage()); Systemexit(1); }
The next chance of an exception occurring is when the program tries to connect to the DBMS A number of things can go wrong, such as inaccurate URL for the database or an inaccurate user ID and/or password If the getConnection() method encounters something unusual, it throws an SQLException The following example builds on the previous example to illustrate how to catch the SQLException in your program This exception is caught in the second catch block Notice that the exit() method is called within the catch block to terminate the program The exit() method is passed the integer 2, which is returned when the program terminates, indicating that the program terminated abnormally because of a problem encountered when connecting to the database
String url = "jdbc:odbc:Registration"; String userID = "jim"; String password = "keogh"; Connection dB; try { ClassforName( "sunjdbcodbcJdbcOdbcDriver");
CHAPTER 13 JDBC and Java Data Objects
dB = DriverManagergetConnection(url,userID,password); } catch (ClassNotFoundException e) { Systemerrprintln( "Unable to load the JDBC/ODBC bridge" + e); Systemexit(1); } catch (SQLException e) { Systemerrprintln( "Cannot connect to the database" + e); Systemexit(2); } finally { dBclose(); }
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