Updating database using vb net Tom kranich nudo
With the attribute, the consumer needed to set it even if only one of many stored procedures being executed by the ADO application returned a rowset. Execute ' It is a good idea to disable the property after execute as the ' same command object may be used for a different SQL statement obj Cmd. The use of this property should be limited to SQL statements containing parameters of N data type as setting it incurs a processing overhead of at least one round-trip to the database. This property should be set to Dim obj Con As NEW ADODB. This property provides a way to selectively add statements to the cache when statement caching is enabled. ' Statement caching is enabled by setting the 'Stmt Cache Size' ' connection string attribute to a value greater than zero obj Con. The stored procedure or function being called could be either standalone or packaged. To see performance gains from metadata caching, Oracle recommends caching only those statements that are executed repeatedly. In addition, these operations cannot be undone with the . Open "select ename, dname " & _ "from emp, dept " & _ "where emp.deptno = dept.deptno", _ obj Con, ad Open Static, ad Lock Optimistic, ad Cmd Text 'Recordset created is updatable. Create Parameter("p Date", ad Date, ad Param Input) obj Cmd. When used with SQL Server Integration Services (SSIS), this allows an application to perform a fast-load to an OLE DB Destination using Oracle Provider for OLE DB.The use of this property should provide a performance boost to applications making use of the attribute previously. By default, this property is set to Dim obj Con As NEW ADODB. By default, the property is set to Dim obj Con As NEW ADODB. Connection String = "Stmt Cache Size=10; Data Source=My Ora Db;" & _ "User ID=scott; Password=tiger;" obj Con. However, the CREATE OR REPLACE PACKAGE Employees AS TYPE empcur IS REF CURSOR; PROCEDURE Get Emp Records(p_cursor OUT empcur, q_cursor OUT empcur, indeptno IN NUMBER, p_errorcode OUT NUMBER); FUNCTION Get Dept(inempno IN NUMBER, p_errorcode OUT NUMBER) RETURN empcur; END Employees; CREATE OR REPLACE PACKAGE BODY Employees AS PROCEDURE Get Emp Records(p_cursor OUT empcur, q_cursor OUT empcur, indeptno IN NUMBER, p_errorcode OUT NUMBER) IS BEGIN p_errorcode := 0; OPEN p_cursor FOR SELECT * FROM emp WHERE deptno = indeptno ORDER BY empno; OPEN q_cursor FOR SELECT empno FROM emp WHERE deptno = indeptno ORDER BY empno; EXCEPTION WHEN OTHERS THEN p_errorcode:= SQLCODE; END Get Emp Records; FUNCTION Get Dept(inempno IN NUMBER, p_errorcode OUT NUMBER) RETURN empcur IS p_cursor empcur; BEGIN p_errorcode := 0; OPEN p_cursor FOR SELECT deptno FROM emp WHERE empno = inempno; RETURN (p_cursor); EXCEPTION WHEN OTHERS THEN p_errorcode:= SQLCODE; END Get Dept; END Employees; Dim Con As New ADODB. method cancels the Ora OLEDB command currently being executed. Rowsets created using queries with joins are updatable by Ora OLEDB only with the Client Cursor Engine enabled. Please note that Cursor Location 'needs to be explicitly set to ad Use Client for this join recordset 'to be updatable. Oracle; User ID=scott;" & _ "Password=tiger; Data Source=My Ora DB;" & _ "Fetch Size=200; Cache Type=File;" con. This behavior occurs because Ora OLEDB does not perform explicit locks on the rows being modified. This can dramatically speed up load times versus using a conventional load.To connect to a specific database, the consumer is required to set the following properties of the Ora OLEDB is compatible with OLE DB Services that are available in OLE DB version 2.0 and later.OLE DB Services contains useful services such as automatic transaction enlistment, Client Cursor Engine (CCE), connection and session pooling, which can enhance application performance, and others.For more information on this subject and how to set it up on Windows clients, refer to the information on authenticating database users on Windows in attribute enables or disables the displaying of the password change dialog box, whenever a logon fails due to an expired password. Note that with this connection attribute enabled, applications need to pad the stored procedure An Ora OLEDB session object represents a single connection to an Oracle Database. Close Statement caching eliminates the need to parse each SQL or PL/SQL statement before execution, by caching server cursors created during the initial statement execution.When enabled, the provider displays the dialog box to change the password. The session object exposes the interfaces that allow data access and manipulation. Subsequent executions of the same statement can reuse the parsed information from the cursor, and then execute the statement without reparsing, for better performance.However, if the attributes are provided, then these new values override the default registry values.These attributes can be set by setting the , the default.
In this level, the changes made by other transactions are not visible until those transactions are committed. Enabling Statement Caching Through the Registry To enable statement caching by default for all Ora OLEDB applications running in a system without changing the application, set the registry key of .
OLE DB Services can be used with Ora OLEDB through C /COM or ADO.
By default, the For C /COM applications, some additional steps are needed to use OLE DB Services.
Each session object also defines a transaction space for a data source. This will enable you to take full advantage of statement caching.
All command and rowset objects created from a particular session object are part of the transaction of that session. Properties("PLSQLRSet") = TRUE ' Stored Functions returning resultsets must be called using the ' ODBC escape sequence for calling stored functions. This is because parsed information from parameterized statements can be reused, even if the parameter values change in subsequent executions.
Search for updating database using vb net:
Example: Setting the Custom Property PLSQLRSet Dim obj Res As NEW ADODB. This method can be useful when the application needs to cancel a long running command during times of heavy network traffic or heavy server use. C/C OLE DB consumers must enable this service to make these rowsets updatable. , only the explicitly provided values for insert and update operations are returned when column values are requested for those rows. However, when new data is submitted to the database, the database only performs the update if the rowset data was not already updated by another user, which means that dirty writes are not allowed. In Visual Basic, date formats are controlled by the Regional Settings properties in Windows Control Panel. In order to perform a fast-load, set the column, the time zone setting of the client is used.