Using the sqlite3 select executemany method allows you to select all rows from a table. This method also returns a list of column names that are immediately after the query. If there are fewer rows available, the sequence returned will be smaller. The method is able to be used with databases stored in files or databases that are saved in RAM.
The method can also be used to return an object that can be used instead of a cursor. This object allows the user to stop the query when the results are returned. It is not possible to share this object between threads. The method is not available in older versions of SQLite.
The connection object is registered with the create_aggregate method of the Connection class. This method is called whenever a progress handler is used for any n instructions of the SQLite virtual machine. It can also be used as a context manager. The instance of the object can be used as a file or a BLOB, which is a type of file that stores data in a SQLite database.
The executescript method of the Connection class is used for running DDL instructions. It can also be used to execute a set of SQLite queries. This method implicitly commits any pending transactions before executing. It also returns a list of the affected rows in the table.
If the query is not a DDL statement, the first method of the Connection class is used. This method is called each time the data is read from the database. The method returns a list of the rows in the table, along with the number of rows that were affected. The second method is called whenever the data is updated. It is used to update all records in one instance. The method returns the number of rows affected by the query.
The method is useful for preserving databases that would not otherwise be saved. It also saves the contents of the in-memory database. It is not suitable for databases that are saved to disk.
The executemany select method returns the number of rows that have been affected by the query. It is also able to handle update anomalies. If the statement does not have a condition, it will return zero. Likewise, a DELETE statement without a condition will remove all rows in the table. The method also has the ability to return an aggregation value. If the aggregation value is non-zero, the query will terminate.
The executescript method of the Connection can also be used to call an authorizer_callback. The authorizer_callback is invoked for each attempt to access a column. The authorizer_callback is passed the type of operation (SELECT, UPDATE, DELETE) and the names of the arguments. It should return SQLITE_OK or SQLITE_DENY. If the authorizer_callback returns SQLITE_DENY, it will not allow access to the columns.
The method is also used to call a function named create_aggregate. This method is able to set the aggregation class that is registered with the create_aggregate method. The function name, the name of the function, and the description attribute are also passed as the parameters.