sql_cmd_ddl.h

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#ifndef SQL_CMD_DDL_INCLUDED
#define SQL_CMD_DDL_INCLUDED
 
#include "lex_string.h"
#include "my_sqlcommand.h"
#include "sql/sql_cmd.h"
 
class THD;
 
class Sql_cmd_ddl : public Sql_cmd {
 public:
  enum enum_sql_cmd_type sql_cmd_type() const override {
    /*
      Somewhat unsurprisingly, anything sub-classed to Sql_cmd_ddl
      identifies as DDL by default.
    */
    return SQL_CMD_DDL;
  }
};
 
/**
  This is a dummy class for old-style commands whose code is in sql_parse.cc,
  not in the execute() function. This Sql_cmd sub-class presently exists
  solely to provide a correct sql_cmd_type() for the command; it does nothing
  else.
*/
class Sql_cmd_ddl_dummy final : public Sql_cmd_ddl {
 private:
  enum_sql_command my_sql_command{SQLCOM_END};
 
 public:
  void set_sql_command_code(enum_sql_command scc) {
    assert(my_sql_command == SQLCOM_END);  // ensure value was not set up yet
    my_sql_command = scc;
  }
 
  enum_sql_command sql_command_code() const override {
    assert(my_sql_command != SQLCOM_END);  // ensure value was set up
    return my_sql_command;
  }
 
  // Error: we should never get here! (see explanation above)
  bool execute(THD *thd [[maybe_unused]]) override {
    assert(false);
    return false;
  }
};
 
class sp_name;
 
class Sql_cmd_create_library final : public Sql_cmd_ddl {
 public:
  Sql_cmd_create_library(THD *thd, bool if_not_exists, sp_name *name,
                         LEX_CSTRING language, LEX_CSTRING comment,
                         LEX_STRING source_code);
 
  enum_sql_command sql_command_code() const override {
    return SQLCOM_CREATE_LIBRARY;
  }
 
  bool execute(THD *thd) override;
 
 private:
  bool m_if_not_exists;
  sp_name *m_name;
  LEX_CSTRING m_language;
  // In order to support prepare of routines that contain CREATE LIBRARY
  // statements, we need to keep a copy of the source code and the comment.
  LEX_CSTRING m_source;
  LEX_CSTRING m_comment;
};
 
class Sql_cmd_alter_library final : public Sql_cmd_ddl {
 public:
  Sql_cmd_alter_library(THD *thd, sp_name *name, LEX_STRING comment);
 
  enum_sql_command sql_command_code() const override {
    return SQLCOM_ALTER_LIBRARY;
  }
 
  bool execute(THD *thd) override;
 
 private:
  sp_name *m_name;
  // In order to support prepare of routines that contain CREATE and ALTER
  // LIBRARY statements, we need to keep a copy of the comment.
  LEX_STRING m_comment;
};
 
class Sql_cmd_drop_library final : public Sql_cmd_ddl {
 public:
  Sql_cmd_drop_library(bool if_exists, sp_name *lib_name)
      : m_if_exists(if_exists), m_name(lib_name) {}
 
  enum_sql_command sql_command_code() const override {
    return SQLCOM_DROP_LIBRARY;
  }
 
  bool execute(THD *thd) override;
 
 private:
  bool m_if_exists;
  sp_name *m_name;
};
 
#endif  // SQL_CMD_DDL_INCLUDED