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NET Oracle Provider in the Microsoft. Overview Classes Executing a Stored Procedure Stored Procedures That Do Not Return Data Accessing Return Values Result Sets and REF CURSORS Packages Using a DataReader Stored Procedures that Return a Single Value Sequences Filling a DataSet Using a DataAdapter Updating Oracle with a DataAdapter Working with Multiple Result Sets Conclusion Related Books. This article is a discussion of how to access Oracle stored procedures named SQL programming blocks and functions which are programming blocks that return a single value using ADO.

NET Oracle Provider, the OLE DB. NET provider, the ODBC. NET data provider, or the ODP. NET provider from Oracle. NET Framework data provider for Oracle. Different functionality is available using the Oracle ODP. NET data provider or the Microsoft. NET Framework data provider for OLE DB. NET data provider ships with the. If you are using. NET Managed Provider for Oracle. For either version, the data provider classes are located in the System.

You use a subset of the classes in the System. OracleClient namespace to execute Oracle stored procedures and functions. These classes are described in the following table:. Executing an Oracle stored procedure is similar to executing a SQL Server stored procedure.

The following steps show how to execute an Oracle stored procedure and retrieve the result that it returns. You might have to use escape sequences if your stored procedure name contains special characters. You can reuse an existing OracleCommand object by resetting the CommandText property. This method also uses an OracleString parameter to return the row id for the last row modified by an UPDATEINSERTor DELETE query. If you are using a DataAdapter to fill a DataTable or DataSetyou can rely on the DataAdapter to open and close the connection.

The code developed in this example to execute the stored procedure and retrieve the result follows:. The ExecuteOracleNonQuery method of the OracleCommand class executes a SQL statement or stored procedure that does not return any rows. The method returns an int value representing the number of rows affected for the UPDATEINSERTand DELETE commands; otherwise it returns If you are executing an INSERTDELETEor UPDATE statement that affects exactly one row, the method has a single OracleString out rowid argument that uniquely identifies the affected row in the Oracle database.

You can use this value to optimize subsequent related queries. You can also use the ExecuteNonQuery method of the OracleCommand class to execute a stored procedure that does not return data, but you will not get the unique row identifier described above. While neither of the above commands returns any data, output parameters and return values mapped to parameters are populated with data. This lets you return one or more scalar values from a stored procedure using either of the above commands.

The following Oracle stored procedure deletes all job history for an employee specified by the single input parameter and does not return any data. The RETURN statement immediately returns control to the calling program from a stored procedure. The RETURN statement in an Oracle stored procedure cannot return a value like it can in T-SQL.

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Oracle functions are subprograms that compute and return a single value. They are structured similarly to stored procedures, except they always have a RETURN clause that must return a value. You execute the function in the same way as a stored procedure. ReturnValue parameter to get the result returned by the function. The following code shows how:.

You use the REF CURSOR data type to work with Oracle result sets. Unlike a normal cursor, a REF CURSOR is a variable, a reference to a cursor that can be set to point to different result sets at execution time. Use a REF CURSOR output parameter to pass a result set from an Oracle structured program back to the calling application.

Define an output parameter of data type OracleType. Cursor in the calling application to access the result set pointed to by the REF CURSOR. The OracleConnection must remain open while the REF CURSOR is being used. There is no equivalent in T-SQL.

A package is a container for logically related programming blocks such as stored procedures and functions. It has two parts:. The parameters for each stored procedure or function appear within parentheses and are separated by commas.

Each parameter is optionally tagged with one of three identifiers:. The following package spec defines four procedures that create, retrieve, update, and delete data from the LOCATIONS table in the HR schema. The following excerpt from the package body for the above package spec shows the implementation details for the first procedure in the GetLocations package:. You create an OracleDataReader by calling the ExecuteReader method of the OracleCommand object.

The package spec follows:. The package body defines a single procedure that retrieves a result set of the job history for a specified employee and returns it as a REF CURSOR output parameter:. The following code executes the procedure, creates a DataReader from the result set, and outputs the contents of the DataReader to the console. With the default installation of the HR schema, the buy carphone warehouse shares output shows the semi colon delimited fields of each of the two records for employee The code also shows how to define the REF CURSOR parameter for the result set.

Notice that the data type is OracleType. Cursor and that the direction is ParameterDirection. Also note that the connection is kept open the entire time that the result set in the REF CURSOR is accessed. If a package returns more than one cursor, the DataReader accesses them in the order you add them to the parameters collection, not the order in which they appear in the procedure.

Use the NextResult method of the DataReader to advance to the next cursor. The ExecuteOracleScalar method of the OracleCommand class is used to execute a SQL statement or stored procedure that returns a single value as an OracleType data type. If the command returns a result set, the method returns the value of the first column of the first row. The method returns a null reference if a REF CURSOR is returned rather than the value of the first column of the first row to which the REF CURSOR points.

The ExecuteScalar method of the OracleCommand class is similar to options buying power td ameritrade ExecuteOracleScalar method, except c# oracle execute stored procedure with output parameter returns a value as a.

NET Framework data type. Having said that, neither of these methods is useful when working with Oracle stored procedures. Oracle stored procedures cannot return a value as part of the RETURN statement, only as OUT parameters—see the Stored Procedures That Do Not Return Data section.

Also, you cannot return a result set except through a REF CURSOR output parameter—this is discussed in the next section. You can retrieve the return seputar forex kurs dollar hari ini for an Oracle function only by using a RETURN parameter shown in the previous section and not by using the one of the ExecuteScalar methods. Oracle uses a sequence to generate unique numbers rather than the data type uniqueidentifier used trade binary options by andrew oliver SQL Server.

In either case, the main use is to generate a sequence of unique numbers for a primary key column. Unlike the uniqueidentifier data type, a sequence is a database object unrelated to the table or tables using it for primary key values.

An Oracle sequence is atomic and consistent. That is, once you access a sequence number, Burlington coat factory stock chart automatically increments the next number before processing the next request, guaranteeing no duplicates for a value.

Largest forex brokers by volume create an Oracle sequence using the CREATE SEQUENCE command. The command takes arguments including increment, start value, maximum value, cycling, and caching.

You access sequence values using the NEXTVAL and CURRVAL keywords. NEXTVAL returns the next number in the sequence while CURRVAL provides access the current value. Most of the sequence code is self-describing. NOCYCLE means that the sequence will not generate more values after the minimum or maximum value is reached. NOCACHE means that sequence values are not allocated before they are requested; good way to make money in old school runescape can be used to improve performance.

NOORDER means that the numbers are generated without the guarantee that earnest money in tendering will be returned in the same order they were requested. The following code shows a stored redwood binary options broker coaching that requests a sequence value, uses it to set the primary key value when inserting a record into the LOCATIONS table, and returns the primary key value in an OUT parameter.

The following code calls the stored procedure to insert a record and retrieve the returned sequence value. The console shows that one record was inserted into the table along with the primary key value generated by the sequence.

You use a REF CURSOR to fill a DataSet using a DataAdapter. The following code uses the stored procedure GetJobHistoryByEmployeeId defined in the Using a DataReader section to populate a DataSet with the result set that it education forex in trading in a REF CURSOR output parameter.

You cannot simply use the Update method of the OracleDataAdapter when you fill a DataSet using a REF CURSOR parameter. This is because Oracle does not provide the information required to determine what the table and column names are when the c# oracle execute stored procedure with output parameter procedure is executed. To use the Update method of the DataAdapteryou have to create procedures to update, insert, and delete records from the underlying table.

The approach is similar to the one used with SQL Server. This section shows how to build a package that handles the create, retrieve, update, and delete operations required both to retrieve LOCATION data from the Oracle database and to update disconnected changes made to the DataSet data back to the Oracle database. The package header follows:. The following code defines a DataAdapter to use the procedures defined in the above package to create, stock market crash 1932, update, and delete data allowing the DataAdapter.

The DataAdapter can be used both to retrieve data into a DataSet and update the Oracle database with changes made to the DataSet. Oracle does not support batch queries, so you cannot return multiple result sets from a command. With a stored procedure, returning multiple result sets is similar to returning a single result set; you have to use REF CURSOR output parameters.

To return multiple result sets, use multiple REF CURSOR output parameters.

Accessing Oracle 9i Stored Procedures Using pezewehemave.web.fc2.com

The following code shows how to fill two related tables in a DataSet using the two result sets returned from the above package:. NET data provider makes it easy to execute stored procedures and access the return values, whether they are one or more scalar values or result sets. You can use Oracle procedures together with the OracleDataAdapter to fill a DataSetwork with the disconnected data, and update the changes to the Oracle database at a later time.

The main differences between Oracle procedures and Microsoft SQL Server stored procedures are that Oracle procedures must return values as output parameters, and that result sets must be returned as REF CURSOR objects to the calling program using output parameters. NET in a Nutshell. Bill Hamilton is a software architect specializing in designing, developing, and implementing distributed applications using Microsoft. NET and J2EE technologies. An early technology adopter, he frequently evaluates, recommends, and helps his clients use new technologies effectively.

Bill has written two books about ADO. Downloads Visual Studio SDKs Trial software Free downloads Office resources SharePoint Server resources SQL Server Express resources Windows Server resources Programs Subscriptions Overview Administrators Students Microsoft Imagine Microsoft Student Partners ISV Startups Events Community Magazine Forums Blogs Channel 9 Documentation APIs and reference Dev centers Samples Retired content.

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The content you requested has been removed. Data Access and Storage ADO. NET Accessing Oracle 9i Stored Procedures Using ADO. Accessing Oracle 9i Stored Procedures Using ADO. Accessing Microsoft Office Data from. Building a Custom Data Provider for Use with the.

NET Data Access Framework. Tackle Data Concurrency Exceptions Using the DataSet Object. Advanced Data Access with ADO. Best Practices for Using ADO. Binary Serialization of ADO. Build a Configurable Web-Based Bug Management Tool Using ADO. NET, XML, and XSLT.

Building a Tiered Web App Using the DataSet and the ASP DataGrid. NET DataReader and DataSet. Implement a Data Access Layer for Your App with ADO. Data Access Strategies Using ADO. Efficient Coding With Strongly Typed DataSets.

Establishing Relationships Between Rowsets with ADO. A First Look at ObjectSpaces in Visual Studio "Whidbey". Teach Old Data New Tricks with the Fully Loaded Advances in ADO. Handling Data Concurrency Using ADO. Managing an IDENTITY Crisis. Managing Hierarchical Inserts in ASP. Migrating Code and Concepts from ADO "Classic" to ADO. Migrating from ADO "Classic" to ADO. Migrating from ADO to ADO. NET, Web Services, Inheritance, and More. Protecting Your Data Integrity with Transactions in ADO.

Understanding SQL Server Return Codes and Output Parameters. Saving Parent-child Data in a Multitiered App Using ADO. Crawl Web Sites and Catalog Info to Any Data Store with ADO. NET and Visual Basic. Techniques in Filling ADO. Performing Your Own Analysis.

NET DataSet for Multitiered Apps. Editing an Access Database with ADO. Weaning Developers from the CommandBuilder. Writing a Portable Data Access Layer. Collapse the table of content. This documentation is archived and is not being maintained. Classes You use a subset of the classes in the System. These classes are described in the following table: Class Description OracleCommand The SQL statement of stored procedure to execute against the Oracle database.

OracleConnection An open connection to the database.

OracleParameter A parameter to an OracleCommand and optionally, its mapping to a DataColumn. OracleParameterCollection A collection of OracleParameter objects. OracleType An enumeration of Oracle data types and structures. Method Description ExecuteReader Builds an OracleDataReader by executing a stored procedure that returns a result set.

ExecuteNonQuery Executes a query or procedure that does not return a result set returning the number of rows affected. ExecuteOracleNonQuery Executes a query, returning the number of rows affected. ExecuteScalar Executes a query or procedure and returns either the return value or the value of the first column of the first row of the result set as a. ExecuteOracleScalar Executes a query or procedure and returns either the return value or the value of the first column of the first row of the result set as an OracleType data type.

WriteLine "Email address is: ExecuteOracleNonQuery out rowId ; conn. GetLocations", new OracleConnection connString ; selectCommand. UpdateLocations", new OracleConnection connString ; updateCommand. VarChar, 30, "CITY" ; updateCommand. DeleteLocations", new OracleConnection connString ; deleteCommand. InsertLocations", new OracleConnection connString ; insertCommand. VarChar, 30, "CITY" ; insertCommand. Add "Table", "EMPLOYEES" ; da.

Is this page helpful? We appreciate your feedback. Dev centers Windows Office Visual Studio Microsoft Azure More Learning resources Microsoft Virtual Academy Channel 9 MSDN Magazine. Community Forums Blogs Codeplex. Programs BizSpark for startups Microsoft Imagine for students. The SQL statement of stored procedure to execute against the Oracle database. A parameter to an OracleCommand and optionally, its mapping to a DataColumn. Builds an OracleDataReader by executing a stored procedure that returns a result set.

Executes a query or procedure that does not return a result set returning the number of rows affected. Executes a query, returning the number of rows affected. Executes a query or procedure and returns either the return value or the value of the first column of the first row of the result set as a. Executes a query or procedure and returns either the return value or the value of the first column of the first row of the result set as an OracleType data type.