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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

vb.net ean 13 reader

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As explained, you can specify the message displayed when an assertion fails For example, if you substitute

assert n > 0 : "n is negative!";

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10:

for the assertion in the preceding program, then the following output will be generated: n is 3 n is 2 n is 1 Exception in thread "main" javalangAssertionError: n is negative! at AssertDemomain(AssertDemojava:17) One important point to understand about assertions is that you must not rely on them to perform any action actually required by the program The reason is that normally, released code will be run with assertions disabled For example, consider this variation of the preceding program:

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vb.net ean 13 reader

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// A poor way to use assert!!! class AssertDemo { // get a random number generator static int val = 3; // Return an integer static int getnum() { return val--; } public static void main(String args[]) { int n = 0; for(int i=0; i < 10; i++) { assert (n = getnum()) > 0; // This is not a good idea! Systemoutprintln("n is " + n); } } }

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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); }

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In this version of the program, the call to getnum( ) is moved inside the assert statement Although this works fine if assertions are enabled, it will cause a malfunction when assertions are disabled, because the call to getnum( ) will never be executed! In fact, n must now be initialized, because the compiler will recognize that it might not be assigned a value by the assert statement Assertions are a good addition to Java because they streamline the type of error checking that is common during development For example, prior to assert, if you wanted to verify that n was positive in the preceding program, you had to use a sequence of code similar to this:

vb.net ean 13 reader

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vb.net ean 13 reader

vb.net ean 13 reader

vb.net ean 13 reader

vb.net ean 13 reader

vb.net ean 13 reader

vb.net ean 13 reader

vb.net ean 13 reader

vb.net ean 13 reader

vb.net ean 13 reader

vb.net ean 13 reader

vb.net ean 13 reader

vb.net ean 13 reader

vb.net ean 13 reader