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Design:

For more goroutine can use the api safty.

Split the db operation.

1. get connection from pool.
2. parse the Executer/Query.
3. run the sql(s) .
4. fetch the result into the out parameter.
5. return the connection back to the pool.

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the Interface BaseOp the base method Error() error, Raw()

ExecuteOp the update/remove/create sql

QueryOp the select sql