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namespace message { class Schema; }
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bool mysql_create_db(Session *session, const message::Schema &schema_message, bool is_if_not_exists);
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bool mysql_alter_db(Session *session, const message::Schema &schema_message);
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bool mysql_rm_db(Session *session, char *db, bool if_exists);
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bool mysql_change_db(Session *session, const LEX_STRING *new_db_name, bool force_switch);