• Create Primary Key. Here is the syntax to define ID attribute as a primary key in a COMPANY table. CREATE TABLE COMPANY( ID INT PRIMARY KEY, NAME TEXT NOT NULL, AGE INT NOT NULL UNIQUE, ADDRESS CHAR (25), SALARY REAL, ); To create a PRIMARY KEY constraint on the 'ID' column when COMPANY table already exists, use the following SQLite syntax −.
• Dec 01, 2013  I know it works with plain SQLite. If I specify a value there for the PK, it will use that one (and of course fail if that key already exists). In Sqlite.Net it ignores what I set and uses its own. This happens with auto increment and without.
• SQLite autoincrement FAQ: How do I get the autoincrement value from my last SQLite INSERT command? You can get the integer value of the primary key field from the last insert into an autoincrement field using a SQLite function named lastinsertrowid, as shown in the example below.

1. Primary Key Adalah
2. Get Generated Primary Key Sqlite Android Download

A Simple Example Project demonstrating how JDXA ORM for Android can use an autoincrement column of a SQLite database table to automatically generate primary key values for new objects

This project shows a simple Android app using JDXA ORM to exchange object data with an on-device SQLite relational database. In particular, it shows the use of an autoincrement column for automatically generating primary key values for new objects.

This SQLite tutorial explains how to use Foreign Keys in SQLite with syntax and examples. A foreign key is a way to enforce referential integrity within your SQLite database. A foreign key means that values in one table must also appear in another table.

Some highlights:

• The object model consists of one POJO class (Employee).
• The declarative mapping specification (in the file ../res/raw/autoincrement_example.jdx) is simple, intuitive, non-intrusive, and succinct.
  • The SQLTYPE specification of 'INTEGER PRIMARY KEY AUTOINCREMENT' for an attribute is used to define an autoincrement column.
  • The RDBMS_GENERATED statement identifies the attribute whose value is automatically generated by the database.
• API calls for CRUD operations are simple.
  • JDX can automatically assign the autoincrement value to the designated attribute of a domain model object when it is persisted.
• JDXA provides handy utility methods for displaying an object or a list of objects.

Please also check the related blog at http://www.softwaretree.com/blog/2016/03/13/generating-unique-ids-for-primary-key-values-using-jdxa-orm/

To run this app in your own setup, please do the following:

• Clone this project on your desktop.
• Get the JDXA SDK download instructions from this link.
• You may download just the mini version of the SDK.
• Add the libraries (JDXAndroid-nn.n.jar and sqldroid.jar) from the SDK to the app/libs directory and build the project.
• Run the app.

About JDXA ORM

JDXA is a simple yet powerful, non-intrusive, flexible, and lightweight Object-Relational Mapping (ORM) product that simplifies and accelerates the development of Android apps by providing intuitive, object-oriented access to on-device relational (e.g., SQLite) data.

Adhering to some well thought-out KISS (Keep It Simple and Straightforward) principles, JDXA boosts developer productivity and reduces maintenance hassles by eliminating endless lines of tedious SQL code.

Unzip the file and extract to “Microsoft Office Activator”. Microsoft office 365 pro plus key generator. You will get another zip file, extract that as well to “Reloader Activator”Step 05:Now run the “Reloder Activator”application.

Some of the powerful and practical features of JDXA include:

• Declarative mapping specification between an object model and a relational model is done textually using a simple grammar (no XML complexity).

• Full flexibility in domain object modeling – one-to-one, one-to-many, and many-to-many relationships as well as class-hierarchies supported.

• POJO (Plain Old Java Objects) friendly non-intrusive programming model, which does not require you to change your Java classes in any way:

  • No need to subclass your domain model classes from any base class
  • No need to clutter your source code with annotations
  • No source code generation (No need for DAO classes)
  • No pre-processing or post-processing of your code

• Support for persistence of JSON objects.

• A small set of intuitive APIs for object persistence.

• Automatic generation of relational schema from an object model.

• A highly optimized metadata-driven ORM engine that is lightweight, dynamic, and flexible.

  Free key generation software. AES is a symmetric block cipher where a single key is used for both encryption and decryption process. The input and output for the AES algorithm each consist of sequences of 128 bits. The key used in this algorithm consists of 128, 192, or 256 bits. AES operates on 8-bit bytes. I am doing AES Key Generation in c# and passing the key generated for AES 128 bit Encryption. The case is while generating the key I am getting byte length as 16 while the key string length is getting higher than 16. While trying online I am getting length as 16 itself. What I have tried: Core Code is as below: AES Key 128 bit Generation. An AES key, and an IV for symmetric encryption, are just bunchs of random bytes. So any cryptographically strong random number generator will do the trick. OpenSSL provides such a random number generator (which itself feeds on whatever the operating system provides, e.g.

JDXA ORM is a product of Software Tree. To get more information and a free trial version of JDXA SDK, please visit http://www.softwaretree.com.

JDXA is used with the SQLDroid open source library. SQLDroid is provided under the licensing terms mentioned here.

Saving data to a database is ideal for repeating or structured data,such as contact information. This page assumes that you arefamiliar with SQL databases in general and helps you get started withSQLite databases on Android. The APIs you'll need to use a databaseon Android are available in the android.database.sqlite package.

Caution: Although these APIs are powerful, they are fairly low-level and require a great deal of time and effort to use:

• There is no compile-time verification of raw SQL queries. As your data graph changes, you need to update the affected SQL queries manually. This process can be time consuming and error prone.
• You need to use lots of boilerplate code to convert between SQL queries and data objects.

For these reasons, we highly recommended using the Room Persistence Library as an abstraction layer for accessing information in your app's SQLite databases.

Define a schema and contract

One of the main principles of SQL databases is the schema: a formaldeclaration of how the database is organized. The schema is reflected in the SQLstatements that you use to create your database. You may find it helpful tocreate a companion class, known as a contract class, which explicitly specifiesthe layout of your schema in a systematic and self-documenting way.

A contract class is a container for constants that define names for URIs,tables, and columns. The contract class allows you to use the same constantsacross all the other classes in the same package. This lets you change a columnname in one place and have it propagate throughout your code.

A good way to organize a contract class is to put definitions that areglobal to your whole database in the root level of the class. Then create an innerclass for each table. Each inner class enumerates the corresponding table's columns.

Note: By implementing the BaseColumnsinterface, your inner class can inherit a primarykey field called _ID that some Android classes such as CursorAdapter expect it to have. It's not required, but this can help your databasework harmoniously with the Android framework.

For example, the following contract defines the table name and column names for asingle table representing an RSS feed:

Create a database using an SQL helper

Primary Key Adalah

Once you have defined how your database looks, you should implement methodsthat create and maintain the database and tables. Here are some typicalstatements that create and delete a table:

Just like files that you save on the device's internalstorage, Android stores your database in your app's private folder. Your data issecure, because by default this area is notaccessible to other apps or the user.

The SQLiteOpenHelper class contains a usefulset of APIs for managing your database.When you use this class to obtain references to your database, the systemperforms the potentiallylong-running operations of creating and updating the database only whenneeded and not during app startup. All you need to do is callgetWritableDatabase() orgetReadableDatabase().

Note: Because they can be long-running,be sure that you call getWritableDatabase() or getReadableDatabase() in a background thread,such as with AsyncTask or IntentService.

To use SQLiteOpenHelper, create a subclass thatoverrides the onCreate() andonUpgrade() callback methods. You mayalso want to implement theonDowngrade() oronOpen() methods,but they are not required.

For example, here's an implementation of SQLiteOpenHelper thatuses some of the commands shown above:

To access your database, instantiate your subclass ofSQLiteOpenHelper:

Put information into a database

Insert data into the database by passing a ContentValuesobject to the insert() method:

The first argument for insert()is simply the table name.

The second argument tells the framework what to do in the event that theContentValues is empty (i.e., you did notput any values).If you specify the name of a column, the framework inserts a row and setsthe value of that column to null. If you specify null, like in thiscode sample, the framework does not insert a row when there are no values.

The insert() methods returns the ID for thenewly created row, or it will return -1 if there was an error inserting the data. This can happenif you have a conflict with pre-existing data in the database.

Read information from a database

To read from a database, use the query() method, passing it your selection criteria and desired columns.The method combines elements of insert()and update(), except the column listdefines the data you want to fetch (the 'projection'), rather than the data to insert. The resultsof the query are returned to you in a Cursor object.

The third and fourth arguments (selection and selectionArgs) arecombined to create a WHERE clause. Because the arguments are provided separately from the selectionquery, they are escaped before being combined. This makes your selection statements immune to SQLinjection. For more detail about all arguments, see thequery() reference.

To look at a row in the cursor, use one of the Cursor movemethods, which you must always call before you begin reading values. Since the cursor starts atposition -1, calling moveToNext() places the 'read position' on thefirst entry in the results and returns whether or not the cursor is already past the last entry inthe result set. For each row, you can read a column's value by calling one of theCursor get methods, such as getString() or getLong(). For each of the get methods,you must pass the index position of the column you desire, which you can get by callinggetColumnIndex() orgetColumnIndexOrThrow(). When finishediterating through results, call close() on the cursorto release its resources.For example, the following shows how to get all the item IDs stored in a cursorand add them to a list:

Delete information from a database

To delete rows from a table, you need to provide selection criteria thatidentify the rows to the delete() method. Themechanism works the same as the selection arguments to thequery() method. It divides theselection specification into a selection clause and selection arguments. Theclause defines the columns to look at, and also allows you to combine columntests. The arguments are values to test against that are bound into the clause.Because the result isn't handled the same as a regular SQL statement, it isimmune to SQL injection.

The return value for the delete() methodindicates the number of rows that were deleted from the database.

Get Generated Primary Key Sqlite Android Download

Update a database

When you need to modify a subset of your database values, use theupdate() method.

Updating the table combines the ContentValues syntax ofinsert() with the WHERE syntaxof delete().

The return value of the update() method isthe number of rows affected in the database.

Persisting database connection

Since getWritableDatabase()and getReadableDatabase() areexpensive to call when the database is closed, you should leave your database connectionopen for as long as you possibly need to access it. Typically, it is optimal to close the databasein the onDestroy() of the calling Activity.

Debug your database

The Android SDK includes a sqlite3 shell tool that allows you to browsetable contents, run SQL commands, and perform other useful functions on SQLitedatabases. For more information, see how to how to issue shell commands.