crystal reports gs1 128 Using Oracle Collections and References in Font

Making Code 3/9 in Font Using Oracle Collections and References

CHAPTER
Create Code 39 Extended In None
Using Barcode creation for Font Control to generate, create Code39 image in Font applications.
www.OnBarcode.com
Making EAN 128 In None
Using Barcode creation for Font Control to generate, create UCC.EAN - 128 image in Font applications.
www.OnBarcode.com
Using Oracle Collections and References
Painting QR Code In None
Using Barcode maker for Font Control to generate, create QR Code image in Font applications.
www.OnBarcode.com
Painting Code-39 In None
Using Barcode printer for Font Control to generate, create Code 3/9 image in Font applications.
www.OnBarcode.com
n s 9 and 10, we discussed how to query and modify Oracle objects in JDBC either as weakly typed Struct (or its Oracle implementation STRUCT) objects or as strongly typed custom classes generated by JPublisher. In this chapter, we will continue the discussion for Oracle collections and references. I provided a brief introduction to Oracle collections in the section Collections (Nested Tables and Varrays) of 8 of this book. As far as references go, I will give a brief introduction to them in this chapter, along with how to access them using JDBC. Very briefly, references are pointers to already existing rows in an object table. For more detailed background information, I encourage you to consult Oracle Database Application Developer s Guide Object Relational Features (10g Release 1). In this chapter, following the conventions of the Oracle documentation, the term collection is used when discussing nested tables and varrays in the database, and the term array is used when discussing their manifestation in JDBC programs. An important point to note is that inside the Oracle database, there may be many differences between nested tables and varrays (as discussed in 8), but there is no difference in terms of the JDBC code that we need to write in order to access or modify them. Both nested tables and varrays map to an array in JDBC, so the same code should work for both. This chapter examines the following topics: How to retrieve collections in the database as a weakly typed java.sql.Array (or its Oracle extension, oracle.sql.ARRAY) object How to retrieve collections as a strongly typed array of custom class objects (generated using the JPublisher utility) Some of the Oracle extensions designed to improve performance with suitable benchmarks What references are and why they should, in general, be avoided How to access and manipulate references from JDBC
Encoding USS Code 128 In None
Using Barcode creator for Font Control to generate, create Code 128C image in Font applications.
www.OnBarcode.com
Encoding Barcode In None
Using Barcode creator for Font Control to generate, create Barcode image in Font applications.
www.OnBarcode.com
CHAPTER 11 USING ORACLE COLLECTIONS AND REFERENCES
Make PDF 417 In None
Using Barcode maker for Font Control to generate, create PDF 417 image in Font applications.
www.OnBarcode.com
Code-27 Creation In None
Using Barcode encoder for Font Control to generate, create Ames code image in Font applications.
www.OnBarcode.com
Weakly Typed Collection Classes
Encode Code-39 In None
Using Barcode drawer for Online Control to generate, create Code 39 image in Online applications.
www.OnBarcode.com
Encode ANSI/AIM Code 39 In Visual Basic .NET
Using Barcode creator for VS .NET Control to generate, create Code 39 Full ASCII image in .NET framework applications.
www.OnBarcode.com
A weakly typed collection class is a manifestation of a collection in Java in the form of the Oracle extension class oracle.sql.ARRAY (which also implements the standard interface java.sql.Array). You can retrieve a database collection of built-in types (such as a nested table of varchar2 elements) as an oracle.sql.ARRAY object in Java. You can also use the oracle.sql.ARRAY interface to retrieve a collection of object types (e.g., a varray of person objects, where person is an object type you created). In such cases, the collection is retrieved as an oracle.sql.ARRAY of oracle.sql.STRUCT objects (we covered the oracle.sql.STRUCT class in 9). A weakly typed collection is mainly useful when, in Java, you don t need to carry out a lot of manipulation of the array object and its elements as objects in memory. In the next two sections, we ll look at the standard Array interface and its Oracle implementation: the ARRAY class.
Encoding Code 128A In Java
Using Barcode encoder for Java Control to generate, create Code 128C image in Java applications.
www.OnBarcode.com
Printing Barcode In Java
Using Barcode encoder for Android Control to generate, create Barcode image in Android applications.
www.OnBarcode.com
The java.sql.Array Interface
UCC.EAN - 128 Generation In None
Using Barcode printer for Software Control to generate, create UCC.EAN - 128 image in Software applications.
www.OnBarcode.com
Scan Barcode In Java
Using Barcode decoder for Java Control to read, scan read, scan image in Java applications.
www.OnBarcode.com
The java.sql.Array (referred to as Array from here onward) interface provides methods to retrieve the database collection either as a generic Object or as a ResultSet from which you can retrieve the individual elements. An important fact to remember about the Array interface is that it has no setter methods, meaning it can t be used to modify the collection. Some of the more commonly used methods of this interface are presented in the sections that follow with brief descriptions.
QR Code ISO/IEC18004 Recognizer In None
Using Barcode recognizer for Software Control to read, scan read, scan image in Software applications.
www.OnBarcode.com
EAN13 Generation In Objective-C
Using Barcode maker for iPhone Control to generate, create EAN 13 image in iPhone applications.
www.OnBarcode.com
getArray()
Code 128 Code Set B Generation In .NET
Using Barcode drawer for .NET framework Control to generate, create Code 128C image in .NET framework applications.
www.OnBarcode.com
Recognizing ECC200 In None
Using Barcode scanner for Software Control to read, scan read, scan image in Software applications.
www.OnBarcode.com
First up is the getArray() method, which is used to retrieve the contents of the database object in the form of an array in the Java programming language: public public public public Object Object Object Object getArray() throws SQLException; getArray( Map typeMap ) throws SQLException; getArray( long index, int count ) throws SQLException; getArray( long index, int count, Map typeMap ) throws SQLException;
Scan Data Matrix In .NET
Using Barcode decoder for VS .NET Control to read, scan read, scan image in Visual Studio .NET applications.
www.OnBarcode.com
Encode Data Matrix 2d Barcode In VS .NET
Using Barcode creation for .NET framework Control to generate, create ECC200 image in Visual Studio .NET applications.
www.OnBarcode.com
These methods use the type map associated with the connection for defining which Java classes are used to represent a collection or its elements in Java. The two methods that take a type map use the passed type map to map the elements into Java objects instead of the type map associated with the Connection object. In the absence of a type map, the method converts the individual elements into various standard Java classes based on Table A-1 of the Appendix. For example, the individual elements of a nested table of varchar2 elements are converted into String objects. Two overloaded versions (the last two methods in the preceding list) retrieve a slice of the database collection of a given Array object, beginning with the specified index and containing up to count successive elements of the SQL array. Note that the elements in the slice are not in a predictable order for a nested table since a nested table, if you recall, is an unordered collection of elements.
Copyright © OnBarcode.com . All rights reserved.