问题
I have a table that holds large data. I want to fetch all the data and process them one by one.
According to the documentation here: https://dev.mysql.com/doc/connector-cpp/en/connector-cpp-examples-results.html
The API for fetching result sets is identical for (simple) statements and prepared statements. If your query returns one result set, use sql::Statement::executeQuery() or sql::PreparedStatement::executeQuery() to run your query. Both methods return sql::ResultSet objects. By default, Connector/C++ buffers all result sets on the client to support cursors.
It says by default it buffers all results sets on the client. How can I disable that?
回答1:
At the statement, you can define the type of the result set. Using TYPE_FORWARD_ONLY leads to unbuffered result sets as defined in mysql release notes:
... Implemented getResultSetType() and setResultSetType() for Statement. Uses TYPE_FORWARD_ONLY, which means unbuffered result set and TYPE_SCROLL_INSENSITIVE, which means buffered result set.
Hope it helps.
来源：https://stackoverflow.com/questions/42097354/mysql-connector-c-unbuffered-resultset-c