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CHAPTER 13 JDBC and Java Data Objects
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String url = "jdbc:odbc:Registration"; String userID = "jim"; String password = "keogh"; String printRow; String firstName; String lastName; Statement dataRequest; ResultSet results; Connection dB; try { ClassforName( "sunjdbcodbcJdbcOdbcDriver"); 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); } try { String query = "SELECT FirstName,LastName FROM Students"; dataRequest = dBcreateStatement( TYPE_SCROLL_INSENSITIVE); results = dataRequestexecuteQuery (query); } catch ( SQLException e ){ Systemerrprintln("SQL error" + e); Systemexit(3); } boolean records = resultsnext(); if (!records ) { Systemoutprintln("No data returned"); Systemexit(4); } try { do { resultsfirst(); resultslast(); resultsprevious();
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resultsabsolute(10); resultsrelative(-2); resultsrelative(2); firstName = resultsgetString ( 1 ) ; lastName = resultsgetString ( 2 ) ; printRow = firstName + " " + lastName; Systemoutprintln(printRow); } while (resultsnext() ); dataRequestclose();
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} catch (SQLException e ) { Systemerrprintln("Data display error" + e); Systemexit(5); } finally { dBclose(); }
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Some JDBC drivers may not support some or all of the scrollable features mentioned in this section The following example shows how you can test whether the JDBC driver your program uses supports the scrollable features
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boolean forward, insensitive, sensitive; DataBaseMetaData meta = dBgetMetaData(); forward = metasupportsResultsSetType( ResultSetTYPE_FORWARD_ONLY); insensitive = metasupportsResultsSetType( ResultSet TYPE_SCROLL_INSENSITIVE); sensitive = metasupportsResultsSetType( ResultSet TYPE_SCROLL_SENSITIVE); Systemoutprintln("forward: " + forward); Systemoutprintln("insensitive: " + insensitive); Systemoutprintln("sensitive: " + sensitive);
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Whenever you request rows from a DBMS, the JDBC driver fetches the number of rows defined by the fetch size and discards the previously fetched set of rows It is important to understand that there is a difference between the number of rows fetched from the DBMS and the number of rows that appear in a resultset
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CHAPTER 13 JDBC and Java Data Objects
For example, the JDBC driver might fetch 500 rows from the DBMS, but include only 100 of those rows in the resultset based on the resultset s maximum row setting In this case, the resultset silently drops 400 rows, although all 500 rows are transferred over the network from the DBMS to your program You can increase the efficiency of fetching rows by using the setFetchSize() method to set the number of rows that the JDBC fetches from the DBMS In the real world, the DBMS administrator will tell you the preferred fetch size setting to use because this is dependent on the performance specification of the DBMS in use Some DBMS may not implement the fetch size control If fetch size isn t supported, the methods will compile and execute, but have no effect The following example shows you how to set the fetch size from within your program by calling the setFetchSize() method defined in the Statement object Here, we ve set the fetch size to 500 rows This means no more than 500 rows will be fetched at a time
String url = "jdbc:odbc:CustomerInformation"; String userID = "jim"; String password = "keogh"; String printRow; String firstName; String lastName; Statement dataRequest; ResultSet results; Connection dB; try { ClassforName( "sunjdbcodbcJdbcOdbcDriver"); 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); } try { String query = "SELECT FirstName,LastName FROM Students"; dataRequest = dBcreateStatement( TYPE_SCROLL_INSENSITIVE);
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dataRequestsetFetchSize(500); results = dataRequestexecuteQuery (query); } catch ( SQLException e ){ Systemerrprintln("SQL error" + e); Systemexit(3); } finally { dbclose(); }
Updatable Resultset
Previously in this chapter, you learned that a resultset is a virtual table of rows and columns that contain data copied from one or more tables of a database Throughout this chapter, you ve seen examples of how to select a subset of rows and columns from tables in the database and copy them into the resultset You then copy data from the resultset into your program for further processing You can also update data in the resultset For example, you might want to change the value of a column before further processing the data You can do this by passing the Connection object s createStatement() method the constant CONCUR_UPDATABLE Once you do this, you can then change the values of a row, delete a row, or insert a new row
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