oracle odac

UPDATE statement is automatically generated UpdateBatchSize Integer The number of bulk commit processing allowed to change data when the dataset is in buffered mode, default is 1 Toradatasetoptionsds AutoClose Boolean Automatically closes the OCI cursor when all data has been obtained. Cachelobs Boolean Whether to buffer locally to save BLOB data Deferredlobread Boole

Odac the efficiency of getting data is high, there are several ways in which you want to get the first page of data faster in a Web program:1, in the database for paging processing;2, get all the data, just quickly return to the first page of data.The first scenario on the application server resource consumption is minimal, the database consumption is slightly larger, the customer needs to be flexible filtering of the whole data, find, statistics is n

It is recommended that you use an array when working with objects. But there may be problems when you need to use a large array in a dataset. For example, when a large array of ODAC is created for a field, a large number of Tfield fields are also created, which can cause the program's performance to be greatly reduced. Therefore, the ODAC limit can only create 1000 members for a field. But either way, you c

Fieldmappingmode Tcrfieldmappingmode field mapping modes, including:Mmfieldindex Map by Field orderMmfieldname Map by Field name Keyviolcount Integer Get the number of records that cannot be replicated due to primary key checksum or primary key violation Mappings TStrings Establish a field mapping relationship between the target dataset and the source dataset, in the following format:Destcolname=sourcecolname

parameter lists with SQL ParamCount Integer Number of parameters Params Parameter collection Datatypemap Tdamaprules Managing mappings between different data types and field types when datasets are turned on Unidirectional Boolean In general, the cursor of a dataset is bidirectional, and when set to true, the cursor becomes one-way so that less memory is consumed Createblobstream

The master/detail relationship between two tables is widely used. It is therefore important to provide a simple way for database application developers to implement it. Let's take a look at how to implement this feature. If we establish a master/BOM relationship between "Department" and "Employee". The Department table contains the following fields: Depno, Depname, and Location. Depno is a numeric primary key, and the other two fields are string types. The Employee table contains the following

Name Type Description Active Boolean Activating SQL Trace Dbmonitoroptions To send trace information to the selection of the Dbmonitor tool software Host IP Address Port Port number Reconnecttimeout Timeout time for reconnection Sendtimeout Timeout time for sending messages Options Track selection of SQL Mocustom When Modialog is s

Tsmartqueryis relative toToraquery A more concise data set with the following members Name Type Description Expand Boolean The default is False, and if true, the dataset will automatically get all field data and information, regardless of what fields are listed in SQL Smartrefresh Boolean The default is false, which means that if the application is in a concurrent environment, changes to the records in the database tables w

4. master-Slave table relationship Name Type Description Mastersource The DataSource component that corresponds to the primary table from the table Detailfields Foreign key fields corresponding to the main table field from the tables Masterfields A field in the primary table that is associated from a table, typically a key field for the primary table 5. Implement the relevant

Name Type Description Options Tvirtualtableoptions Select items, including:Vopersistentdata: does not process its related data content when the dataset is closedVostored: The processing of data sets during the design period and the data entered will be stored in the DFM file AddField Add a field that takes effect after active=true DeleteField Delete a field Deletefields Delete all fields

When a refresh operation is performed, another dataset is executed through this property, which performs more refresh actions Refreshsql Refresh the required SQL statements Sql Returns the corresponding SQL statement based on the specified action type Apply Set parameters and execute SQL for data updates. If the parameter is included, its execution efficiency is higher than execsql Execsql

. How to install the Oracle Data Access Component ODAC ----- install the driver Note: The driver is installed to enable Oracle provider for old db for the data source in SQLSERSSVER. MSSQL2008 comes with this driver by default. Fang Yi:If the 32-bit win2003 operating system is used, there will be the Microsoft ole db Provider for

The Oracle data Access Components (ODAC) library provides a number of non-visual components for Borland delphi,c++ Builder and Kylix. They are used to access Oracle relational database systems. Similar to BDE, ODAC is also one of the alternative ways to process data.The ODAC

Label:Recently asked the classmate "why." NET application connecting to an Oracle database is always an error? "I think this is because we usually use Microsoft's products and lack research on other platform products." Microsoft has always had a "platform unified" dream, but unfortunately this dream will never come true. Why, because there are many companies like Oracle do not buy Microsoft accounts, they w

Label:Recently asked the classmate "why." NET application connecting to an Oracle database is always an error? "I think this is because we usually use Microsoft's products and lack research on other platform products." So much nonsense, I'll talk about how to properly configure Oracle to adapt to. NET application development.First, download the required components

Use a. NET application to connect to the Oracle database. netoracle Recently, I was asked by my friends, "Why is there always an error in connecting the. NET application to the Oracle database ?", I think this is because we usually use Microsoft products, but lack research on other platform products. After talking so much nonsense, let's talk about how to correctly configure

a complete ORACLE11GR2 program is also an effective method, but this 64-bit version of the installation package has 2 multi-g, quite large, if only to establish a linked server, there is no need to install such a monster. In fact, we only need to download the ODAC compressed package on the Oracle official website.As to how to install ODAC, not the focus of this

----------------------------------------- The preceding section describes how to use the first data provider to access Oracle, Next, we will introduce the. NET Framework data provider for OLEDB. Add a connection to the Oracle database as before, However, the data provider used this time is used for the. NET Framework data provider of OLEDB. I still use scott users to access the

The company's new project uses Oracle database and entityframework. There is no suitable information on the Internet, so you cannot learn and practice it. First, use dbfirst mode. 1. Download the Oracle plug-in odac that supports ado.net. Odac 11.2 release 3 (11.2.0.2.1) with Or