ASP.NET PDF Viewer using C#, VB/NET

Internal LOBs can be accessed and manipulated from SQL, PL/SQL, and JDBC. Since SQL and PL/SQL are tools used extensively in JDBC, we will briefly look at how to manipulate LOBs in each of these environments in the next few sections. For a detailed discussion on these and other LOB-related topics, consult Oracle Database Application Developer s Guide Large Objects (10g Release 1). If you want to jump directly to the explanation of LOB usage in JDBC, please go to the section of this chapter titled Using LOBs in JDBC. Let s first create the schema to contain our CLOB data. The following table, clob_table, contains one CLOB column called clob_col: benchmark@ORA10G> create table clob_table 2 ( 3 x varchar2(30), 4 id number, 5 clob_col clob 6 ); Table created. Next, we insert one row using a simple insert statement and commit: benchmark@ORA10G> insert into clob_table (clob_col) 2 values ( 'A clob example' ); 1 row created. benchmark@ORA10G> commit; Commit complete.

qr code vb.net free, barcodelib.barcode.winforms.dll download, winforms code 128, vb.net generate gs1 128, vb.net ean-13 barcode, barcode pdf417 vb.net, itextsharp remove text from pdf c#, itextsharp replace text in pdf c#, data matrix vb.net, c# remove text from pdf,

If any modifications are made to these fields, access must be synchronized, of course But this is the case with the Application object as well (it provides the Lock and Unlock methods to do this), and it s best to use these fields for read-only information you want to make available to your entire application However, with the inline script model, the class doesn t exist until the code generation step at runtime, and unlike most of the dynamically created classes in the ASP NET 20 environment, you cannot reference it within the integrated development environment (IDE) at design time This is true even when you add the ClassName attribute to the Application directive For these reasons, as well as the other many benefits of the code-behind model, there are benefits you can gain from using the ASP NET 1x model for the global.

In Oracle8i and earlier, you had to use the PL/SQL package DBMS_LOB to access and manipulate LOBs. Starting with Oracle9i, you can access CLOBs (or NCLOBs) using the SQL varchar2 semantics. This is typically useful when performing operations with relatively smaller LOBs (e.g., up to 100,000 bytes). Many SQL functions that take varchar2 as a parameter will accept a CLOB instead. Let s go through some examples, starting with a simple select of the CLOB data we inserted: benchmark@ORA10G> select clob_col from clob_table; A clob example Next, we apply some SQL functions that are known to work with varchar2 data. We use the functions substr, instr, and length, and the concatenation operator in these examples. The first example applies the substr function to the CLOB column of table clob_table: benchmark@ORA10G> select substr( clob_col, 1, 3) from clob_table; A c Then we find the starting position of the string 'clob' in our CLOB column by using the intsr function: benchmark@ORA10G> select instr( clob_col, 'clob') from clob_table; 3 In the next example, we select a string value concatenated with our CLOB column: benchmark@ORA10G> select clob_col || '( concatenated to clob)' 2 from clob_table; A clob example( concatenated to clob) We use the like operator to select rows matching a CLOB column s value: benchmark@ORA10G> select clob_col 2 from clob_table 3 where clob_col like '%clob%'; A clob example Finally, we use the LENGTH function to get the CLOB column s length: benchmark@ORA10G> select length(clob_col) clob_length 2 from clob_table; 14

The first step in using LINQ with F# is to generate the code that implements the object/relational (O/R) mapping for the database tables to which you are connecting Let s first look at why you want to do this You learned previously how you can create simple tables and store and retrieve data using SQL code However, this approach doesn t work well for large data schemas with multiple related tables and constraints For instance, creating a hierarchy of records in a number of related tables connected by foreign keys involves issuing multiple SQL statements to create the base data and to connect them in ways that obey the foreign key and other constraints that may be in place Instead, it can often be much better to view records in tables as if they were objects This is part of what an O/R mapping provides.