vb.net ocr read text from pdf

vb.net ocr read text from pdf

vb.net ocr read text from pdf

vb.net ocr read text from pdf

vb.net ocr read text from pdf

vb.net ocr read text from pdf

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4 / begin * ERROR at line 1: ORA-01031: insufficient privileges ORA-06512: at "SYS.DBMS_SESSION", line 82 ORA-06512: at line 2 We get an error as expected. Now we ll define the package. The package HR_APP_CTX_PKG has one procedure that builds the query dynamically and returns a ref cursor as an out parameter: scott@ORA10G> create or replace package hr_app_ctx_pkg 2 as 3 procedure build_dynamic_query( p_ename in varchar2, p_deptno in number, p_cursor in out sys_refcursor ); 4 end; 5 / Package created. The package body follows and has explanatory comments embedded within: scott@ORA10G> create or replace package body hr_app_ctx_pkg 2 as 3 procedure build_dynamic_query( p_ename in varchar2, p_deptno in number, p_cursor in out sys_refcursor ) 4 is 5 l_query long; 6 begin We begin our query with a where clause similar to the one in the earlier section in the Java program. The where clause always returns true and exists merely as a programming convenience. 7 l_query := 'select ename, deptno, job, sal from emp where 0 = 0';

Notification filtering is based on name-value pairs included in a payload header. The burden of filtering is not on the Event Service, but on the proxy objects that forward notifications from the supplier to the channel. To achieve filtering, special Filter objects are defined and attached to the proxy, as shown in Figure 5-21.

Note When you copy the files back to your desktop computer, you ll have to follow the same steps to

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Next, we define our query string. This is where we use the dbms_session.set_context() method to set a value in the context. We set the employee name (if it is not null) in a name, ename, of the context. We append % to it also as required. Notice that the use of sys_context() in the query ensures that our values are actually bound at runtime. This is what enables us to dynamically bind any number of values in a query: 8 9 10 11 12 if( p_ename is not null ) then dbms_session.set_context( 'HR_APP_CTX', 'ENAME', p_ename ||'%'); l_query := l_query || ' and ename like sys_context( ''HR_APP_CTX'', ''ENAME'')'; end if;

When the proxy receives a notification, it calls the match method of each Filter. If any of the filters returns false, the notification is discarded; otherwise, it is forwarded to the event channel. The filters attached to a given proxy only affect that proxy. You create supplier proxies by calling a SupplierAdmin method. SupplierAdmin objects are the parents of supplier proxy objects. In order for all the proxies to use the same filters, the filters must be attached to the SupplierAdmin parent, as shown in Figure 5-22.

Similarly, we bind the value of the p_deptno parameter as another name/value pair in the context. Notice that in this case we use the to_number() SQL function to convert the string value into a number value explicitly. At the end, we return a cursor to the query: 13 14 15 16 17 18 19 20 21 22 if( p_deptno is not null ) then dbms_session.set_context( 'HR_APP_CTX', 'DEPT_NO', p_deptno ); l_query := l_query || ' and deptno = to_number(sys_context( ''HR_APP_CTX'', ''DEPT_NO''))'; end if; dbms_output.put_line( l_query ); open p_cursor for l_query; end; end; /

Figure 5-22. Common filters that apply to all supplier proxies When a supply proxy is given a message to deliver, it first checks the parent SupplierAdmin filters, then its own filters. A notification must satisfy all the filters; otherwise, it is rejected. You can also filter notifications on the consumer side of an event channel. Everything said thus far about filtering can be applied to the consumer side, so you can attach filters to ConsumerAdmin objects and consumer proxy objects. Filters can even be present simultaneously at both the supplier and consumer ends. There are two kinds of filters available: those related to QoS properties defined in the notification header, and those related to properties defined in the notification body. Filters work with expressions defining constraints on notification name-value pairs contained both in the header and body. The syntax of the filtering expressions is defined in an extensible constraint language that all filters must support. Implementation-dependent extensions are allowed, as long as they don t break the core language.

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