sql_xa_rollback.h

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#ifndef XA_SQL_CMD_XA_ROLLBACK
#define XA_SQL_CMD_XA_ROLLBACK
 
#include "sql/sql_cmd.h"                 // Sql_cmd
#include "sql/xa.h"                      // xid_t
#include "sql/xa/sql_xa_second_phase.h"  // Sql_cmd_xa_second_phase
 
/**
  @class Sql_cmd_xa_rollback
 
  This class represents the `XA ROLLBACK ...` SQL statement which rollbacks
  and terminates an XA transaction with the given xid value.
 
  @see Sql_cmd
*/
class Sql_cmd_xa_rollback : public Sql_cmd_xa_second_phase {
 public:
  /**
    Class constructor.
 
    @param xid_arg XID of the XA transacation about to be rolled back.
   */
  explicit Sql_cmd_xa_rollback(xid_t *xid_arg);
  virtual ~Sql_cmd_xa_rollback() override = default;
 
  /**
    Retrieves the SQL command code for this class, `SQLCOM_XA_ROLLBACK`.
 
    @see Sql_cmd::sql_command_code
 
    @return The SQL command code for this class, `SQLCOM_XA_ROLLBACK`.
   */
  enum_sql_command sql_command_code() const override;
  /**
    Executes the SQL command.
 
    @see Sql_cmd::execute
 
    @param thd The `THD` session object within which the command is being
               executed.
 
    @return false if the execution is successful, true otherwise.
   */
  bool execute(THD *thd) override;
 
 private:
  /**
    Roll back and terminate a XA transaction.
 
    @param thd The `THD` session object within which the command is being
               executed.
 
    @retval false  Success
    @retval true   Failure
  */
  bool trans_xa_rollback(THD *thd);
  /**
    Handle the statement XA ROLLBACK for the case when xid corresponds to an
    XA transaction that is attached to the thread's THD object, that is a
    transaction that is part of the current thread's session context.
 
    @param thd The `THD` session object within which the command is being
               executed.
 
    @return  operation result
      @retval false  Success
      @retval true   Failure
  */
  bool process_attached_xa_rollback(THD *thd) const;
  /**
    Handle the statement XA ROLLBACK for the case when xid corresponds to an
    XA transaction that is detached from the thread's THD, that it a
    transaction that isn't part of the current's thread session context.
 
    @param thd The `THD` session object within which the command is being
               executed.
 
    @return  operation result
      @retval false  Success
      @retval true   Failure
  */
  bool process_detached_xa_rollback(THD *thd);
};
 
#endif  // XA_SQL_CMD_XA_ROLLBACK