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SQL> 2 3 4 5 6 7 8 9 10 11 select ttablespace_name name, dallocated, uused, ffree, tstatus, dcnt, contents, textent_management extman, tsegment_space_management segman from dba_tablespaces t, (select sum(bytes) allocated, count(file_id) cnt from dba_data_files where tablespace_name='EXAMPLE') d, (select sum(bytes) free from dba_free_space where tablespace_name='EXAMPLE') f, (select sum(bytes) used from dba_segments where tablespace_name='EXAMPLE') u where ttablespace_name='EXAMPLE';

8:

Examples in 22 showed how to use reflection to determine the attributes attached to a class. You can also use reflection to find all the types in an assembly or dynamically locate and call functions in an assembly. You can even use it to emit the .NET intermediate language on the fly to generate code that can be executed directly. The documentation for the .NET CLR contains more details on using reflection.

The PATTERN is the regular expression for the text that we are looking for The REPLACEMENT is a specification for the text or regular expression that we want to use to replace the found text with For example, you may remember from the substr definition earlier in the chapter that you could replace a specific number of characters within a string by using assignment:

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NAME ALLOCATED USED FREE STATUS CNT CONTENTS EXTMAN SEGMAN ------- ---------- --------- --------- ------ ---- --------- ------ -----EXAMPLE 104857600 81395712 23396352 ONLINE 1 PERMANENT LOCAL AUTO

$string = 'The cat sat on the mat'; $start = index($string,'cat',0); $end = index($string,' ',$start)-$start; substr($string,$start,$end) = 'dog';

Click the CREATE button to create a tablespace The Create Tablespace window prompts for a tablespace name, and the values for Extent Management, Type, and Status In most circumstances, the defaults will be correct: Local, Permanent, and Read Write Then the ADD button lets you specify one or more datafiles for the new tablespace Each file must have a name and a size, and can optionally be set to autoextend up to a maximum file size The autoextend facility will let Oracle increase the size of the datafile as necessary, which may avoid out-of-space errors Figures 5-4 and 5-5 show the Database Control interfaces for creating a tablespace NEWTS with one datafile

You can achieve the same result with a regular expression:

$string = 'The cat sat on the mat'; $string = s/cat/dog/;

Figure 5-4

Note that we have managed to avoid the process of finding the start and end of the string we want to replace This is a fundamental part of understanding the regular expression syntax A regular expression will match the text anywhere within the string You do not have to specify the starting point or location within the string, although it is possible to do so if that s what you want Taking this to its logical conclusion, we can use the same regular expression to replace the word cat with dog in any string, irrespective of the location of the original word:

The following example looks through an assembly and locates all the types in that assembly: using System; using System.Reflection; enum MyEnum { Val1, Val2, Val3 } class MyClass { } struct MyStruct { } class Test { public static void Main(String[] args) { // list all types in the assembly that is passed // in as a parameter Assembly a = Assembly.LoadFrom (args[0]); Type[] types = a.GetTypes(); // look through each type, and write out some information // about them. foreach (Type t in types) { Console.WriteLine ("Name: {0}", t.FullName); Console.WriteLine ("Namespace: {0}", t.Namespace); Console.WriteLine ("Base Class: {0}", t.BaseType.FullName); } } }

Clicking the sHOW SQL button would display this command (the line numbers have been added manually):

$string = 'Oscar is my cat'; $string = s/cat/dog/;

The $string variable now contains the phrase Oscar is my dog, which is factually incorrect, but it does demonstrate the ease with which you can replace strings with other strings Here s a more complex example that we will return to later In this instance, we need to change a date in the form 03/26/1999 to 19990326 Using grouping, we can change it very easily with a regular expression:

1 2 3 4 5 6 7 CREATE SMALLFILE TABLESPACE "NEWTS" DATAFILE 'D:\APP\ORACLE\ORADATA\ORCL11G\newts01dbf' SIZE 100M AUTOEXTEND ON NEXT 10M MAXSIZE 200M LOGGING EXTENT MANAGEMENT LOCAL SEGMENT SPACE MANAGEMENT AUTO DEFAULT NOCOMPRESS;

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