IntroductionThe Microsoft.NET Framework consists of ADO.NET which enables developers to interact with the database. ADO.NET provides many rich features that can be used to retrieve and display data in a number of ways.
Apart from the flexibility provided by ADO.NET, sometimes we find ourselves repeating the same code again and again. Consider that at some point in our application we need to pass some parameters and retrieve some information from the database. We can perform this task by writing 5-6 lines of code which is cool.
But when later we need to pass parameters again we have to write those 5-6 lines again, which is not cool.For this reason Microsoft introduced the Data Access Application Block which can be used to perform common tasks with less code. Another good reason to use the Microsoft.NET Data Access Application Block is that it makes the application consistent, meaning that if different companies are using the Data Access Block then you will find the code more easier to understand. You can download the Microsoft.NET Data Access Application Block from. Download the Application Block and simply install it. Let's see how we can use it. Using the codeUsing the Microsoft.NET Data Access Application Block:In this article I have used the Microsoft.NET Data Access Application Block Version 2.0.
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Once you download and install the application block you need to refer it in your application. For this first you need to create the.dll file for the Microsoft.NET Data Access Application Block project.
You can simply add the Data Access Application Block project in your current project and build the solution (this can also be performed using the command line tools). Once the solution is built, the.dll file is created under the bin directory. Delete the Data Access Project from your current project as you only need it to create the.dll. And now add a reference in your project which will refer toMicrosoft.ApplicationBlock.Data. Once you have made the reference you are ready to use the Application Block in your project.
Accessing data without Data Access Application Block:Let's first see how we can access data without using the Application Block so that we can compare the flexibility of both approaches. Below is a simple example that inserts two parameters into the database.
Added inpublic SQLiteOpenHelper ( context,name,factory,int version)Create a helper object to create, open, and/or manage a database.This method always returns very quickly. The database is not actuallycreated or opened until one of oris called. ParameterscontextContext: to use for locating paths to the the databaseThis value may be null.nameString: of the database file, or null for an in-memory databaseThis value may be null.factorySQLiteDatabase.CursorFactory: to use for creating cursor objects, or null for the defaultThis value may be null.versionint: number of the database (starting at 1); if the database is older,will be used to upgrade the database; if the database isnewer, will be used to downgrade the database.
Added inpublic SQLiteOpenHelper ( context,name,factory,int version,errorHandler)Create a helper object to create, open, and/or manage a database.The database is not actually created or opened until one ofor is called.Accepts input param: a concrete instance of to beused to handle corruption when sqlite reports database corruption. Added inpublic SQLiteOpenHelper ( context,name,int version,openParams)Create a helper object to create, open, and/or manage a database.This method always returns very quickly. The database is not actuallycreated or opened until one of oris called. ParameterscontextContext: to use for locating paths to the the databaseThis value may be null.nameString: of the database file, or null for an in-memory databaseThis value may be null.versionint: number of the database (starting at 1); if the database is older,will be used to upgrade the database; if the database isnewer, will be used to downgrade the databaseopenParamsSQLiteDatabase.OpenParams: configuration parameters that are used for opening.Please note that flag will always beset when the helper opens the databaseThis value must never be null.Public methods. Added inpublic getReadableDatabase Create and/or open a database. This will be the same object returned byunless some problem, such as a full disk,requires the database to be opened read-only.
In that case, a read-onlydatabase object will be returned. If the problem is fixed, a future callto may succeed, in which case the read-onlydatabase object will be closed and the read/write object will be returnedin the future.Like, this method maytake a long time to return, so you should not call it from theapplication main thread, including from. Returnsa database object valid untilor is called.Throwsif the database cannot be opened. Added inpublic void onDowngrade ( db,int oldVersion,int newVersion)Called when the database needs to be downgraded. This is strictly similar tomethod, but is called whenever current version is newer than requested one.However, this method is not abstract, so it is not mandatory for a customer toimplement it. If not overridden, default implementation will reject downgrade andthrows SQLiteExceptionThis method executes within a transaction. If an exception is thrown, all changeswill automatically be rolled back.ParametersdbSQLiteDatabase: The database.oldVersionint: The old database version.newVersionint: The new database version.
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Added inpublic abstract void onUpgrade ( db,int oldVersion,int newVersion)Called when the database needs to be upgraded. The implementationshould use this method to drop tables, add tables, or do anything else itneeds to upgrade to the new schema version.The SQLite ALTER TABLE documentation can be found. Anime desktop mascot download adobe. If you add new columnsyou can use ALTER TABLE to insert them into a live table. If you rename or remove columnsyou can use ALTER TABLE to rename the old table, then create the new table and thenpopulate the new table with the contents of the old table.This method executes within a transaction. If an exception is thrown, all changeswill automatically be rolled back.ParametersdbSQLiteDatabase: The database.oldVersionint: The old database version.newVersionint: The new database version.
Added inDeprecated inpublic void setIdleConnectionTimeout (long idleConnectionTimeoutMs)This method was deprecatedin API level 29.DO NOT USE this method. See the javadoc offor the details.Sets the maximum number of milliseconds that SQLite connection is allowed to be idlebefore it is closed and removed from the pool.This method should be called from the constructor of the subclass,before opening the databaseDO NOT USE this method.This feature has negative side effects that are very hard to foresee.See the javadoc offor the details. ParametersidleConnectionTimeoutMslong: timeout in milliseconds. Use valueto allow unlimited idle connections.Value is 0 or greater. Added inpublic void setLookasideConfig (int slotSize,int slotCount)ConfiguresThis method should be called from the constructor of the subclass,before opening the database, since lookaside memory configuration can only be changedwhen no connection is using itSQLite default settings will be used, if this method isn't called.Use setLookasideConfig(0,0) to disable lookasideNote: Provided slotSize/slotCount configuration is just a recommendation.The system may choose different values depending on a device, e.g. Lookaside allocationscan be disabled on low-RAM devices ParametersslotSizeint: The size in bytes of each lookaside slot.Value is 0 or greaterslotCountint: The total number of lookaside memory slots per database connection.Value is 0 or greater.