![]() ![]() If I wanted to make sure items were always retrieved in the order they were inserted, I would add a timestamp column that I would use to order by, rather than the id, so that order can be preserved even if my ids are compressed, filled, recycled, or optimized. ![]() This would allow you to always present contiguous numbers starting at 1, regardless of the fill of your auto-incrementing database IDs. 3 Answers Sorted by: 0 You are not setting the id in your object d - Add this line in your for loop - d.setid (c.getInt (c. Combining this with my response from above, you could order by the id, then use a value in Java that you increment inside your getAllNames() method which you present to the user. There is basic SQL syntax for doing this, so I will leave you to investigate it. You need to order your elements when you are querying for them. Databases and database queries are generally un-order collections of things - there is no 'sit sequentially'. Public methods autoGenerate boolean autoGenerate () Set to true to let SQLite generate the unique id. The primary key is used to delete the row, as shown here: var rowcount db.Delete(someStock.Id) // Id is the primary key You can check the rowcount to confirm how many rows were affected (deleted in this case).Or the newly added item should sit sequentially in the database. The user should be unaware of how the database increments or maintains its identifiers. I actually think the unique ids in the database should be independent of anything you display to the user. Before you start: Consider using Isar a Flutter database by the author of Hive that is superior in every way. I am not positive this is the best route to go though. String Name=res.getString(res.getColumnIndex(CONTACTS_COLUMN_NAME)) Äinnu goud wrote:What I am expecting is ,whenever an item is deleted or all the items are deleted either the column ids should get updated If you want to renumber the ids in the database, then you need to renumber the ids - your delete code would have to be extended to get all items with a greater id and decrement them. ) Code language: SQL (Structured Query Language) (sql) Unlike other constraints such as PRIMARY KEY and CHECK, you can only define NOT NULL constraints at the column level, not the table level. String Index=res.getString(res.getColumnIndex(CONTACTS_COLUMN_ID)) To define a NOT NULL constraint for a column, you use the following syntax: CREATE TABLE tablename (. SQLiteDatabase db = this.getReadableDatabase() Ĭursor res = db.rawQuery( "select * from nameBook", null ) įor(res.moveToFirst() !res.isAfterLast() res.moveToNext()) ![]() Intent intent = new Intent(getApplicationContext().class) Obj.setOnItemClickListener(new void onItemClick(AdapterView arg0, View arg1, int pos, long arg3) The content of the SQLITESEQUENCE table can be modified using ordinary UPDATE, INSERT, and DELETE statements. In general terms, it is used for a primary key column because a primary key in SQL is supposed to be unique and not null. Obj = (ListView)findViewById(R.id.listView1) My problem is when I delete these items and add a new one ,list showsĨ.item name(in place of 1.item name) even though there are no elements in it.Which is not appropriate from user's perspective.What I am expecting is ,whenever an item is deleted or all the items are deleted either the column ids should get updated or the newly added item should sit sequentially in the database.įinal ArrayList array_list = mydb.getAllNames() įinal ArrayAdapter arrayAdapter = new ArrayAdapter(this,android.R.layout.simple_list_item_1, array_list) In SQLite, if you have an INTEGER column identified as the PRIMARY KEY, you can optionally have SQLite assign unique values for. I am getting the rows to delete but am not having any luck resetting the primary key.Hi,I have an arraylist in my android app where I can see list of names like:Ä¡,2,3,4,5,6,7 are coloumn ids in my sqlite database.Column id is set to primary key with auto increment. Problem is the auto-increment does not work. Force bigPrimarykey to be an INT so that people using Mysqlite for testing wont have issues on autoincrements. The SQL query for table creation is included. Mysqlite doesnt allow autoincrements on BIGINT, so the autoincrement should be removed out of the statement. When upgraded, I would like to delete both rows and reset my Primary Key to 1. SQLite PRIMARY key AutoIncrement doesn't work Ask Question Asked 8 years, 1 month ago Modified 8 years, 1 month ago Viewed 8k times 4 I'm trying to a have a table with an auto incremented primary key. ![]()
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