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ResultSet Results; Connection Db; try { ClassforName( "sunjdbcodbcJdbcOdbcDriver"); Db = DriverManagergetConnection(url,userID,password); } catch (ClassNotFoundException error) { Systemerrprintln("Unable to load the JDBC/ODBC bridge" + error); Systemexit(1); } catch (SQLException error) { Systemerrprintln("Cannot connect to the database" + error); Systemexit(2); } try { String query = "SELECT FirstName,LastName FROM Customers"; DataRequest = DbcreateStatement(TYPE_SCROLL_INSENSITIVE); Results = DataRequestexecuteQuery (query); } catch ( SQLException error ){ Systemerrprintln("SQL error" + error); Systemexit(3); } boolean Records = Resultsnext(); if (!Records ) { Systemoutprintln("No data returned"); Systemexit(4); } try { do { Resultsfirst(); Resultslast(); Resultsprevious(); Resultsabsolute(10); Resultsrelative(-2); Resultsrelative(2); FirstName = ResultsgetString ( 1 ) ; LastName = ResultsgetString ( 2 ) ; printrow = FirstName + " " + LastName; Systemoutprintln(printrow); } while (Resultsnext() ); DataRequestclose(); } catch (SQLException error ) { Systemerrprintln("Data display error" + error); Systemexit(5); }
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J2ME DATA MANAGEMENT
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Not All JDBC Drivers Are Scrollable
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Although the JDBC API contains methods to scroll a ResultSet, some JDBC drivers may not support some or all of these features, and therefore they will not be able to return a scrollable ResultSet Listing 10-15 can be used to test whether or not the JDBC driver in use supports a scrollable ResultSet
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Listing 10-15 Testing whether a driver supports a scrollable ResultSet
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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: " + answer); Systemoutprintln("insensitive: " + insensitive); Systemoutprintln("sensitive: " + sensitive);
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When the J2ME application requests rows from the ResultSet, some rows are fetched into the driver and returned at one time Other times, all rows requested may not be retrieved at the same time In this case, the driver returns to the DBMS and requests another set of rows that are defined by the fetch size and then discards the current set of rows This process continues until the J2EE retrieves all rows Although the Statement class has a method for setting maximum rows, the method may not be effective since the driver does not implement them In addition, the maximum row setting is for rows in the ResultSet and not for the number of rows returned by the DBMS For example, the maximum rows can be set to 100 The DBMS might return 500 rows, but the ResultSet object silently drops 400 of them This means all 500 rows are still pumped over the network The fetch size is set by using the setFetchSize() method, which is illustrated in Listing 10-16 However, all DBMS vendors may not implement the fetch size Consult the driver documentation to determine whether fetch size is supported If fetch size isn t supported, the methods will compile and execute, but have no effect Don t become overly concerned about setting the fetch size because fetch size is in the area of performance tuning, which is handled by the database administrator or the network engineer Listing 10-16 illustrates how to set the maximum number of rows returned by the DBMS The second try {} block in Listing 10-16 calls the createStatement() method of the Connection object and then sets the maximum number of rows to 500 using the setFetchSize() method of the Statement object
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10:
JDBC Objects
Listing 10-16 Setting the maximum number of rows returned in a ResultSet
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 error) { Systemerrprintln("Unable to load the JDBC/ODBC bridge" + error); Systemexit(1); } catch (SQLException error) { Systemerrprintln("Cannot connect to the database" + error); Systemexit(2); } try { String query = "SELECT FirstName,LastName FROM Customers"; DataRequest = DbcreateStatement(TYPE_SCROLL_INSENSITIVE); DataRequestsetFetchSize(500); Results = DataRequestexecuteQuery (query); } catch ( SQLException error ){ Systemerrprintln("SQL error" + error); Systemexit(3); }
J2ME DATA MANAGEMENT
Updatable ResultSet
Rows contained in the ResultSet can be updated similar to how rows in a table can be updated This is made possible by passing the createStatement() method of the Connection object the CONCUR_UPDATABLE Alternatively, the CONCUR_READ_ONLY constant can be passed to the createStatement() method to prevent the ResultSet from being updated There are three ways to update a ResultSet These are updating values in a row, deleting a row, and inserting a new row All of these changes are accomplished by using methods of the Statement object
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