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Figure 4.150. The coding for the Speci cation page. in .NET Printing PDF 417 in .NET Figure 4.150. The coding for the Speci cation page.




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Figure 4.150. The coding for the Speci cation page. using .net touse pdf417 in asp.net web,windows application interleaved 25 4.19 Build a Sample Oracle Database Project OracleSelectRTObject Figure 4.151. The opened Body page of the package. In line 2, we de ned the returned data type as a CURSOR TYPE by using TYPE CURSOR TYPE IS REF CURSOR;. since you must use a cu barcode pdf417 for .NET rsor to return a group of data and the IS operator is equivalent to an equal operator. The prototype of the procedure SelectFacultyCourse() is declared in line 3.

Two arguments are used for this procedure: input parameter FacultyName, which is indicated as an input by using the keyword IN, followed by the data type of VARCHAR2. The output parameter is a cursor named FacultyCourse followed by the keyword OUT. Each PL/SQL statement must be followed by a semicolon, and this rule also applies to the END statement.

Click the Finish button to complete this step. You can click the Compile button to compile this speci cation block if you like. Next, we need to create the body block of this package.

Click the Body tab to open the Body page, which is shown in Figure 4.151. Click the Edit button to begin to create the body part.

Enter the PL/SQL code shown in Figure 4.152 into this body. The procedure prototype is redeclared in line 2.

But the IS operator is attached at the end of this prototype, and it is used to replace the AS operator to indicate that this procedure needs to use a local variable facultyId, and this variable will work as an intermediate variable to hold the returned faculty id from the rst query, which is located at line 6. Starting from BEGIN, our real SQL statements are included in lines 6 and 7. The rst query is to get the faculty id from the Faculty table based on the input parameter FacultyName, which is the rst argument of this procedure.

The SELECT . . .

INTO statement is utilized to temporarily store the returned faculty id into the intermediate variable facultyId.. Data Selection Query with Visual Basic.NET Figure 4.152. The coding for the Body part of the package. The OPEN FacultyCourse FOR command is used to assign the returned data columns from the following query to the cursor variable FacultyCourse. Recall that we used a SET command to perform this assignment functionality in the SQL Server stored procedure in Section 4.18.

9. In lines 9 and 10, the second query is declared, and it is to get all course id and courses taught by the selected faculty member from the Course table based on the intermediate variable s value, faculty id, which is obtained from the rst query above. The queried results are assigned to the cursor variable FacultyCourse.

Now let s compile our package by clicking the Compile button. A successful compiling notice such as. PL/SQL code successfull PDF 417 for .NET y compiled (22:20:06). will be displayed if th is package is bug-free, as shown in Figure 4.153. The development of our Oracle package is complete, and now let s go to Visual Studio.

NET to call this package to perform the course query for our Course form.. 4.19.9 Query Data Using the Oracle Package for the Course Form Open the Course form wi ndow, double-click the Select button to open its event procedure, and enter the code shown in Figure 4.154 into this event procedure. Let s take a look at this piece of code to see how it works.

A. The package query string is declared rst, and this string contains both the package name (Faculty Course) and the stored procedure s name (Select FacultyCourse). All query strings for the Oracle database package must.

4.19 Build a Sample Oracle Database Project OracleSelectRTObject Figure 4.153. The compiled coding for the body part of the package. follow this style. The .net vs 2010 PDF-417 2d barcode package name and the procedure name de ned in this string must be identical to the names we used when we created this package in the Object Browser in Oracle Database 10g XE.

Otherwise the calling of this package would fail. All data components used to perform this query are declared and created here. First, two Oracle parameter objects are created: paramFacultyName and paramFacultyCourse.

These two parameter objects will be passed into the calling package, and they work as input and output parameters, respectively. Some other components, such as the TableAdapter, Command, DataTable, and Data Reader, are also created here. The rst parameter object is initialized rst.

Both the parameter name, FacultyName, and the data type, VARCHAR, must be identical to the name and the data type we used when we created this procedure in Oracle Database 10g XE. The parameter s value should be equal to the selected name from the Faculty Name combo box (ComboName.Text) in the Course form window in Visual Basic.

NET. The second parameter is also initialized with the associated parameter name and data type. One important point is that the second parameter is an output parameter and its data type is cursor, and the transmission direction of this parameter is output.

So the Direction property of this parameter object must be clearly indicated by assigning the Output to it. Otherwise, the procedure calling may encounter an error, which is hard to debug. The Command object is initialized by assigning the associated property, such as the Connection, CommandType, and CommandText.

The CommandType should be StoredProcedure, and the CommandText should be the query string we declared at the beginning of this event procedure (step A)..
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