![]() For this to happen, declare the Id column as either ROWID or INTEGER PRIMARY KEY. when working normally with the database, you can ommit the Id in INSERTs and SQLite will generate one for you. INSERT INTO PaymentInformation (NAME, Start, End) VALUES ('Tina','','') WHERE NOT EXISTS ( SELECT FROM PaymentInformation WHERE name 'Tina' AND durationstart '' ) Is this how it should be done It shouldn't insert if Tina is already in the table with a Start day of.your original IDs will be preserved when the database is being rebuilt by using INSERT commands and explicitly specifying the Id!.that you don't need to specify AUTOINCREMENT.You can create it explicitly with the AUTOINCREMENT keyword. The keyword AUTOINCREMENT can be used with INTEGER field only. SQLite integer primary key without assignment/autoincrement. We can auto increment a field value by using AUTOINCREMENT keyword when creating a table with specific column name to auto increment. There are a couple of ways you can create an AUTOINCREMENT column: You can create it implicitly when you define the column as INTEGER PRIMARY KEY. SQLite AUTOINCREMENT is a keyword used for auto incrementing a value of a field in the table. Declare the column type as INT instead of INTEGER. So the easiest ways to disable it are: Declare the column as UNIQUE instead of PRIMARY KEY. It also means that the Id is only generated automatically if you don't supply one at INSERT. In SQLite, an AUTOINCREMENT column is one that uses an automatically incremented value for each row that’s inserted into the table. 2 Answers Sorted by: 9 Autoincrement behavior applies only to columns declared as INTEGER PRIMARY KEY. It only determines whether IDs of deleted rows will be reused or not. This means that AUTOINCREMENT is not required for rows to be auto-incremented. In other words, the purpose of AUTOINCREMENT is to prevent the reuse of ROWIDs from previously deleted rows. ROWID (by whatever name you call it) is assigned a value whenever you INSERT a row, as you would expect. If you include a column of type INTEGER PRIMARY KEY, that column points at (is an alias for) the automatic ROWID column. This is in every SQLite table whether you ask for it or not. There are a couple of ways you can create an AUTOINCREMENT column: You can create it implicitly when you define the column as INTEGER PRIMARY KEY. If the AUTOINCREMENT keyword appears after INTEGER PRIMARY KEY, that changes the automatic ROWID assignment algorithm to prevent the reuse of ROWIDs over the lifetime of the database. 9 Answers Sorted by: 219 You get one for free, called ROWID. In SQLite, an AUTOINCREMENT column is one that uses an automatically incremented value for each row that’s inserted into the table. This is true regardless of whether or not the AUTOINCREMENT keyword is used. On an INSERT, if the ROWID or INTEGER PRIMARY KEY column is not explicitly given a value, then it will be filled automatically with an unused integer, usually one more than the largest ROWID currently in use. The documentation for SQLite Autoincrement says:
0 Comments
Leave a Reply. |
AuthorWrite something about yourself. No need to be fancy, just an overview. ArchivesCategories |