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93 lines
3.2 KiB
C++
93 lines
3.2 KiB
C++
#ifndef SQL_SCHEMA_H_INCLUDED
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#define SQL_SCHEMA_H_INCLUDED
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/*
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Copyright (c) 2020, MariaDB Corporation.
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This program is free software; you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation; version 2 of the License.
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This program is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with this program; if not, write to the Free Software
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Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1335 USA */
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#include "mysqld.h"
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#include "lex_string.h"
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class Lex_ident_sys;
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class Create_func;
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class Schema
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{
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LEX_CSTRING m_name;
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public:
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Schema(const LEX_CSTRING &name)
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:m_name(name)
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{ }
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virtual ~Schema() = default;
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const LEX_CSTRING &name() const { return m_name; }
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virtual const Type_handler *map_data_type(THD *thd, const Type_handler *src)
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const
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{
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return src;
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}
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/**
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Find a native function builder, return an error if not found,
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build an Item otherwise.
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*/
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Item *make_item_func_call_native(THD *thd,
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const Lex_ident_sys &name,
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List<Item> *args) const;
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/**
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Find the native function builder associated with a given function name.
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@param thd The current thread
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@param name The native function name
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@return The native function builder associated with the name, or NULL
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*/
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virtual Create_func *find_native_function_builder(THD *thd,
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const LEX_CSTRING &name)
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const;
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// Builders for native SQL function with a special syntax in sql_yacc.yy
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virtual Item *make_item_func_replace(THD *thd,
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Item *subj,
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Item *find,
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Item *replace) const;
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virtual Item *make_item_func_substr(THD *thd,
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const Lex_substring_spec_st &spec) const;
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virtual Item *make_item_func_trim(THD *thd, const Lex_trim_st &spec) const;
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/*
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For now we have *hard-coded* compatibility schemas:
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schema_mariadb, schema_oracle, schema_maxdb.
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But eventually we'll turn then into real databases on disk.
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So the code below compares names according to the filesystem
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case sensitivity, like it is done for regular databases.
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Note, this is different to information_schema, whose name
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is always case insensitive. This is intentional!
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The assymetry will be gone when we'll implement SQL standard
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regular and delimited identifiers.
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*/
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bool eq_name(const LEX_CSTRING &name) const
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{
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return !table_alias_charset->strnncoll(m_name.str, m_name.length,
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name.str, name.length);
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}
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static Schema *find_by_name(const LEX_CSTRING &name);
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static Schema *find_implied(THD *thd);
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};
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extern Schema mariadb_schema;
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extern const Schema &oracle_schema_ref;
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#endif // SQL_SCHEMA_H_INCLUDED
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