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CHAPTER 3 INTRODUCTION TO JDBC
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// declare constants for column indexes in the query (indexes begin with 1) final int EMPNO_COLUMN_INDEX = 1; final int ENAME_COLUMN_INDEX = 2; final int JOB_COLUMN_INDEX = 3; and loop through the result set, printing out the value in each column of a row: // print the results while (rset.next()) { int empNo = rset.getInt ( EMPNO_COLUMN_INDEX ); String empName = rset.getString ( ENAME_COLUMN_INDEX ); String empJob = rset.getString ( JOB_COLUMN_INDEX ); System.out.println( empNo + " " + empName + " " + empJob ); } } catch (SQLException e) { // handle the exception properly - in this case, we just // print a message and stack trace and exit the application System.err.println ("error message: " + e.getMessage() ); e.printStackTrace(); Runtime.getRuntime().exit(1); }
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Note The preceding example uses the default ResultSet type. In 7, we cover other, more
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advanced features of the ResultSet interface, including prefetching and scrollability.
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Once we are done printing the results, we use the close() method on the ResultSet, Statement, and Connection objects in the finally clause of the try catch block to end our program: finally { // close the result set, statement, and connection. // ignore any exceptions since we are in the // finally clause. try { if( rset != null ) rset.close(); if( stmt != null ) stmt.close(); if( conn != null ) conn.close();
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CHAPTER 3 INTRODUCTION TO JDBC
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} catch ( SQLException ignored ) {ignored.printStackTrace(); } } } } It is important to realize the need to close the ResultSet, Statement, and Connection objects explicitly in your JDBC application when you are done using them. Failure to do so can result in serious memory leaks and running out of cursors on the database server. Note that the cursor is not released until you close both the Statement and ResultSet objects. It is also critical to do the cleanup activities in the finally clause so that the resources are released, even if an exception is raised.
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Remember to close the ResultSet, Statement, and Connection objects when you are done using Tip
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them in the finally clause of the try catch block.
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When you compile and run the code, you should see the following output: B:\>java GetEmpDetails Database connect url: jdbc:oracle:thin:scott/tiger@rmenon-lap:1521:ora10g Establishing connection to the database...Connected. Printing query results ... 7369 7499 7521 7566 7654 7698 7782 7788 7839 7844 7876 7900 7902 7934 SMITH CLERK ALLEN SALESMAN WARD SALESMAN JONES MANAGER MARTIN SALESMAN BLAKE MANAGER CLARK MANAGER SCOTT ANALYST KING PRESIDENT TURNER SALESMAN ADAMS CLERK JAMES CLERK FORD ANALYST MILLER CLERK
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Potential Errors When Executing Your First Program
If you were able to successfully run the GetEmpDetails program discussed in the previous section, you may skip to the next section. Otherwise, please read on, as it is vital for you to get this program working to proceed further. These are some of the checks you should make:
CHAPTER 3 INTRODUCTION TO JDBC
Make sure you have taken care of all potential errors mentioned in the section Potential Errors When Compiling or Executing JDBCOldStyleConnection. Many of these error conditions are applicable even though you get your connection using DataSource. When you run the program, you may get runtime exceptions. Table 3-8 summarizes some common scenarios (other than those mentioned in the section Potential Errors When Compiling or Executing JDBCOldStyleConnection ), the probable cause, and the action you need to take to rectify the problem. Table 3-8. Common Runtime Exceptions When Running GetEmpDetails and Corresponding Remedial Actions
Error Message (Trimmed)
error message: ORA-00904: "EPNO": invalid identifier java.sql.SQLException: ORA-00904: "EPNO": invalid identifier . . .
Possible Cause Fix
Invalid column name in the query string Correct your query statement string to ensure that all column names are valid. Correct the table name in your query. Ensure you have the database privilege to select from the table.
java.sql.SQLException: ORA-00942: table or view does not exist
Invalid table name in your query
Exception Handling in JDBC
When an error occurs, Oracle throws an instance of the java.sql.SQLException object. You handle this exception just like any other Java exception. The errors can originate in the JDBC driver or in the database. You can retrieve basic error information with the following SQLException methods. For errors originating in the JDBC driver, the following method returns the error message with no prefix. For errors originating in the RDBMS, it returns the error message prefixed with the corresponding ORA number. getMessage() For errors originating in either the JDBC driver or the RDBMS, this method returns the five-digit ORA number: getErrorCode() For errors originating in the database, this method returns a five-digit code indicating the SQL state: getSQLState() Like any exception, this method prints out the exception stack trace: printStackTrace()
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