问题
Im using sqlite db in a sample rails application. From my users table, i have cleared all records using User.delete_all. But now whenever i insert a new record in the table using User.create, the id is starting at a value which is one more than the id of the last record which was there in the table. For example, if my table had 5 records and i cleared all, then when i do User.create, its starting at id 6.
Is there any way i can make the id start from 1 again ?
Thank You
回答1:
Similar question : How to reset a single table in rails? . We can run the following at rails console to reset id column to 1 for a sqlite table
ActiveRecord::Base.connection.execute("DELETE from sqlite_sequence where name = '<table_name>'")
回答2:
You seem to have autoincrement turned on for the id column.
Sqlite handles these values in an internal table called sqlite_sequence. You could reset the id for a particular autoincrement-enabled table by querying:
UPDATE "sqlite_sequence" SET "seq" = 0 WHERE "name" = $YOURTABLENAME
However, this is not a good idea because the autoincrement functionality is intended to be used in a way that the user does not influence its algorithm. Ideally, you should not care about the actual value of your id but consider it only as a unique identifier for a record.
来源：https://stackoverflow.com/questions/13892065/reset-the-id-field-in-a-table-in-a-sqlite-db-in-rails