#Sqlite rowid android#
#Sqlite rowid code#

I'm trying to access that rowid (I spare you all the database code and focus on the query): tx. Here is a screenshot of the table in Chrome debugger: None of the fields is a primary key so the records have a default rowid generated by SQLite. If SQLite cannot find any unused integer, it will issue an SQLITEFULL error. Imagine an index in the database like an index of a book. This helps SQLite quickly locate the row based on the values of the indexed columns. The index contains data from the columns that you specify in the index and the corresponding rowid value. If your data reaches this maximum value and you attempt to insert a new row, SQLite will find an unused integer and uses it. Whenever you create an index, SQLite creates a B-tree structure to hold the index data. If no successful INSERTs into rowid tables have ever occurred on this database connection, then. This came up on another forum where a poster was failing to find the ROWID, and I had a memory that what I have described is the reason, confirmed by googling and. That is, doing SELECT does not suffice and one must instead do SELECT ROWID. I have a database containing a table with some fields. The maximum value of the rowid column is 9,223,372,036,854,775,807, which is very big. Returns the row ID of the most recent INSERT into the database. It seems that, in order to have ROWID as part of a result set, one must explicitly request it.

#Sqlite rowid android#

See How AUTOINCREMENT Works in SQLite for more information.With SQLite and Cordova on an Android device. When you define a table with an autoincrement column, that column automatically uses the ROWID value for its row. If a table contains a user defined column using one of those names, then that name always refers the explicitly declared column and cannot be used to retrieve the integer ROWID value. The ROWID value can be accessed using one of the special case-independent names rowid, oid, or _rowid_ in place of a column name. All tables in SQLite have a ROWID unless the table is defined using WITHOUT ROWID. The ROWID is a 64-bit signed integer key that uniquely identifies the row within its table. INSERT INTO DogsĪnd of course, last_insert_rowid() will also reflect this latest ROWID value. However, in this case, the ROWID value will still reflect this explicit value. It is also possible to override the autoincrement value with your own explicit value. If you do this, then your “ID” column could have a different value to the ROWID value. The rowid value can be queried with the rowid keyword. Note that it is possible to create a column without using the inbuilt SQLite autoincrement feature. Every SQLite table (except without rowid tables) has a rowid column. In SQLite, a column with type INTEGER PRIMARY KEY is an alias for the ROWID. Therefore, when I select all rows, I can see that the last row contains the last_insert_rowid() value in that column. This was defined implicitly when I used INTEGER PRIMARY KEY. rowid can be used to uniquely identifies a row within the table. CREATE TABLE Dogs(Īs a side note, when I created the tables, I defined the first columns as autoincrement columns. By default, every row in SQLite has a special column usually called rowid. Therefore, if I create a new table, then insert rows into that table, the last_insert_rowid() value will be based on that insert operation.

Note that last_insert_rowid() works based on database connection, not at the table level. SELECT last_insert_rowid() Īs expected, the last ROWID is 3. We can now use the last_insert_rowid() function to return the value of the last ROWID. Therefore, this SQL statement would have created three different ROWIDs 1, 2, and 3. This will automatically create a ROWID for each row.

Here’s an example to demonstrate how the last_insert_rowid() function works in SQLite.įirst, let’s create a table and insert some data: CREATE TABLE Cats( SQLite has a function called last_insert_rowid() that returns the ROWID of the last row insert from the database connection which invoked the function.