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APEX comprises tables and PL/SQL packages installed in three schemas in an Oracle database The primary schema in APEX 32, APEX_030200, is where the majority of the objects are installed In prior versions, this schema used FLOWS_ as the prefix, so APEX 31 is installed in FLOWS_ 030100 The FLOWS_FILES schema contains only one table that is used to store any files uploaded through the APEX interface The third schema, APEX_PUBLIC_USER, is used by OHS to connect to the database This schema does not own any objects and has a very restricted set of privileges Once APEX is installed, you must log into the APEX administration interface and provision a workspace (Figure 11-1), which is a logical grouping of developers, applications, and schemas Each workspace can have one or more schemas assigned to it Each application within a workspace has an application-level attribute called Parse-As Schema that defines the schema or user for which all of the code within that application will execute To start, let s analyze the sequence of events that occur when an APEX application executes In doing so, we will cover many of the components in play and see how they interoperate The following URL will serve as the basis for an example of an APEX page that contains a simple report based on a SQL query: http://apexoraclecom/pls/apex/f p=100:3:6789:NO:::P3_DEPTNO:999 When you enter the URL for this page, your web browser makes a request to the OHS based on Apache (We ll talk about the embedded PL/SQL Gateway later, but the concepts are similar) Apache notices that the first part of the URL is /pls/, so it hands off control to mod_plsql, which looks at the next part of the URL, apex, and determines that it should use the APEX Database Access Descriptor (DAD) The definition of the DAD contains a database connect string as well as a username and a password hash OHS will use this username to connect to the database By default, this username is APEX_PUBLIC_USER, so if you query the username column from the v$session table in an active APEX environment, you ll see a number of sessions connected as APEX_PUBLIC_USER After you connect to the database, mod_plsql tells the database to execute the PL/SQL procedure contained in the URL APEX uses a public synonym, f, which points to the show procedure in the PL/SQL package wwv_flow owned by APEX_XXXXXX (version 32+) or FLOWS_ XXXXXX wwv_flow will then determine the application and page requested base on the colondelimited parameter string Each application has a parse as attribute that indicates in which database schema the application should operate APEX then looks at the requested page to find any objects that it should display Since this page has only a query, the APEX rendering engine then calls the protected system package SYSWWV_DBMS_SQL to execute the SQL query as the schema specified in the parse as attribute For example, if the parse as schema of your application is HR and the source of your regions is select * from employees, that will be parsed and executed with the rights of the HR user (see Figure 11-2). crystal reports barcode label printing Crystal Report: Font problem - Experts Exchange I have a report made with crystal report wich contains a field with a barcode font. 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Once installed, no other components or fonts need to be installed to create barcodes , even when it is distributed or accessed from a server. The Crystal Reports Native Barcode Generator is a barcode script that is easily integrated into a report by copying, pasting and connecting the data source. Once installed, no other components or fonts need to be installed to create barcodes , even when it is distributed or accessed from a server. Quiz 497 10 A spectrum analyzer displays: A Time as a function of frequency B Frequency as a function of time C Signal strength as a function of time D Signal strength as a function of frequency 11 The deviation for voice FM signals is usually: A Plus-or-minus 3 kHz B Plus-or-minus 5 kHz C Plus-or-minus 6 kHz D Plus-or-minus 10 kHz 12 Wideband FM is preferable to narrowband FM for music transmission because: A Lower frequencies are heard better B Spectrum space is conserved C The fidelity is better D No! Narrowband FM is better for music 13 In which mode of PM does the pulse level vary A PAM B PDM C PWM D PFM 14 In which PM mode do pulses last for varying times A PAM B PWM C PFM D PCM 15 How many states are commonly used for the transmission of digitized voice signals A Two B Four C Six D Eight 16 In an SSTV signal, the frame time is: A 1/525 second B 1/30 second C 1/8 second D 8 seconds FIGURE 11-1 8: barcode font not showing in crystal report viewer Crystal Reports 2D Barcode Generator 17.02 Free download Crystal Reports 2D Barcode Generator 17.02 - Crystal Reports 2D BarcodeGenerator. crystal reports barcode not showing Data Matrix Crystal Reports Barcode Generator Library in .NET Project NET Crystal Reports Barcode Library SDK; Work perfectly with Visual Studio & .NET Framework 2.0, 3.0, 3.5, 4.0 versions; Generate & add 2d Data Matrix on ... 498 Data transmission 17 The bandwidth of a fax signal is kept narrow by: A Sending the data at a slow rate of speed B Limiting the image resolution C Limiting the range of shades sent D Using pulse modulation 18 What is the wavelength of a 213-MHz signal A 462 m B 141 m C 210 km D 639 km 19 A coaxial cable: A Keeps the signal confined B Radiates efficiently C Works well as a transmitting antenna D Can pick up signals from outside 20 An advantage of fiberoptics over cable communications is: A More sensitivity to noise B Improved antenna efficiency C Higher RF output D Simpler and easier maintenance FIGURE 11-2 Here s an example of setting two default items: ONCE A SIGNAL HAS LEFT A TRANSMITTER, THE IMPULSES TRAVEL, OR propagate, in a cable, optical fiber, or space In cables, the signals are ac (usually) or dc (sometimes) In fiberoptic systems, the signals are infrared or visible light The signals are confined in cables and fibers; the only important variable is the attenuation per kilometer This depends on the ac frequency, the thickness of wire, or the clarity of optical fiber material In communication via electromagnetic waves, the propagation is affected by several factors APEX uses a number of pre-spawned database sessions between OHS and the database This technique is called connection pooling (see Figure 11-3) and is highly scalable, since creating new database connections is an expensive process that could add significant time to the overall page load time if a new session were created for each request In addition, each dedicated database session requires a certain amount of Program Global Area (PGA) memory on the database, which could add up to a huge amount of wasted memory for client-server systems with a large number of concurrent users (choose from list {"Madrid", "Paris", "San Francisco", "Wasilla"} default items {"Paris", "Wasilla"} with multiple selections allowed FIGURE 11-3 The orientation of the E flux is the polarization of an EM wave If the E flux lines are parallel to the earth s surface, you have horizontal polarization If the E flux lines are perpendicular to the surface, you have vertical polarization Polarization can be slanted at any angle between horizontal and vertical The orientation of the E flux lines sometimes rotates as the wave travels through space This is circular polarization if the E-field intensity remains constant If the E-field intensity is more intense in some planes than in others, the polarization is said to be elliptical Rotating polarization can be either clockwise or counterclockwise, viewed as the wavefronts approach you This is the sense of polarization 11: When you set one or more default items, the user can select one of the other items but can t deselect all items So there s no point in allowing no selection (as discussed next) if you set one or more default items how to print barcode in crystal report using vb net Crystal Reports 2D Barcode Generator 17.02 Free download Crystal Reports 2D Barcode Generator 17.02 - Crystal Reports 2D BarcodeGenerator . barcode font not showing in crystal report viewer Crystal Report Barcodes and Barcode Fonts - Barcode Resource Copy the formula for the barcode that you intend to use from the file CR_Formula.txt (in the Resource subdirectory) to the Crystal Report's Formula Editor. For example, if you want to use Code39, copy the Encode_Code39 formula and paste it into the Formula Editor. birt barcode plugin,best free ocr library c#,birt gs1 128,asp.net core qr code generator
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