sql_xa_recover.h

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#ifndef XA_SQL_CMD_XA_RECOVER
#define XA_SQL_CMD_XA_RECOVER
 
#include "sql/sql_cmd.h"  // Sql_cmd
#include "sql/xa.h"       // xid_t
 
/**
  @class Sql_cmd_xa_recover
 
  This class represents the `XA RECOVER` SQL statement which returns to a
  client a list of XID's prepared to a XA commit/rollback.
 
  @see Sql_cmd
*/
class Sql_cmd_xa_recover : public Sql_cmd {
 public:
  /**
    Class constructor.
 
    @param print_xid_as_hex Whether or not to print the XID as hexadecimal.
   */
  explicit Sql_cmd_xa_recover(bool print_xid_as_hex);
  virtual ~Sql_cmd_xa_recover() override = default;
 
  /**
    Retrieves the SQL command code for this class, `SQLCOM_XA_RECOVER`.
 
    @see Sql_cmd::sql_command_code
 
    @return The SQL command code for this class, `SQLCOM_XA_RECOVER`.
   */
  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:
  /** Whether or not the XID should be printed in hexadecimal form. */
  bool m_print_xid_as_hex;
 
  /**
    Return the list of XID's to a client, the same way SHOW commands do.
 
    @param thd The `THD` session object within which the command is being
               executed.
 
    @retval false  Success
    @retval true   Failure
 
    @note
      I didn't find in XA specs that an RM cannot return the same XID twice,
      so trans_xa_recover does not filter XID's to ensure uniqueness.
      It can be easily fixed later, if necessary.
  */
  bool trans_xa_recover(THD *thd);
  /**
    Check if the current user has a privilege to perform XA RECOVER.
 
    @param thd The `THD` session object within which the command is being
               executed.
 
    @retval false  A user has a privilege to perform XA RECOVER
    @retval true   A user doesn't have a privilege to perform XA RECOVER
  */
  bool check_xa_recover_privilege(THD *thd) const;
};
 
#endif  // XA_SQL_CMD_XA_RECOVER