ado net entity data model

The EF team launched a complete set of cache and SQL Execution log solutions, efproviderwrappers. Their practice is to add a layer of packaging on the original EF provider, and use this layer of packaging interception for data caching and log monitoring. The cached data is the native data returned by the database after query, and is not an

The EF team launched a complete set of cache and SQL Execution log solutions, efproviderwrappers. Their practice is to add a layer of packaging on the original EF provider, and use this layer of packaging interception for data caching and log monitoring. The cached data is the native data returned by the database after query, and is not an

When adding an object using the object framework, we cannot directly call the addobject () method when adding an object containing the referenced object, unless the entity itself does not reference any other entity! However, in a project, many entities reference one or more other entities. To add such entities to the object framework, you must first query the entities of all referenced objects, add the obje

(); U.sex= Convert.toboolean (dr["Sex"]); U.birthday= Convert.todatetime (dr["Birthday"]); U.nation= dr["Nation"]. ToString (); List. ADD (U); } conn. Close (); returnList//Back to List } //Add a record method Public voidInsert (Users u)//you need to enter a variable of type users{Cmd.commandtext="INSERT into Users values (@username, @password, @nickname, @sex, @birthday, @nation)"; Cmd. Parameters.clear (); Cmd. Para

we know that the most direct and powerful way to operate Excel is to reference the Excel DLL and use the packaged EXCEL object system to search for and update Excel Data, or some other actions. However, if you simply process some set data, there is a way to avoid complicated Excel objects, various strange variables and function parameters, that is, ADO.

, OdbcDataAdapter, or OracleDataAdapter object), which calls the OLE DB The API provided by the provider or the underlying data source. The main difference between ADO and ado.net is that in Ado.net, the data adapter allows you to control how changes made to the dataset are transferred to the database by performing performance optimizations, executing

The two basic components of the ADO. Net object model are generally: One is a dataset, which is disconnected from the data source and does not need to know the source of the maintained data; The other is the. NET

SQL database string injection attack:You need to use CMD. Parameters this collectionPLACEHOLDER: @key represent this position with the placeholder.Parameters The data represented by this placeholder in this collectionCmd. Parameters.clear (); --To empty the collection before adding the placeholder dataCmd. Parameters.Add ("@pwd", PWD); --Placeholder content fillsCmd. Parameters.Add ("@nname", nname);Cmd. Parameters.Add ("@sex", (sex== "male")? " 1 ":"

Ado. NET is based on Netframwork some core classes, you can divide these classes into two groups: the container classes that are used to manage data and the control classes that are used to connect to a particular data source.Container classes are generic and can use the same data