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138 lines
3.7 KiB
C++
138 lines
3.7 KiB
C++
/* Copyright (C) 2006 MySQL AB
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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 02110-1301 USA */
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#ifndef RPL_UTILITY_H
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#define RPL_UTILITY_H
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#ifndef __cplusplus
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#error "Don't include this C++ header file from a non-C++ file!"
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#endif
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#include "mysql_priv.h"
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struct st_relay_log_info;
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typedef st_relay_log_info RELAY_LOG_INFO;
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uint32
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field_length_from_packed(enum_field_types field_type, byte const *data);
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/**
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A table definition from the master.
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The responsibilities of this class is:
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- Extract and decode table definition data from the table map event
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- Check if table definition in table map is compatible with table
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definition on slave
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Currently, the only field type data available is an array of the
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type operators that are present in the table map event.
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@todo Add type operands to this structure to allow detection of
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difference between, e.g., BIT(5) and BIT(10).
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*/
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class table_def
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{
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public:
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/**
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Convenience declaration of the type of the field type data in a
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table map event.
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*/
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typedef unsigned char field_type;
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/**
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Constructor.
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@param types Array of types
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@param size Number of elements in array 'types'
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*/
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table_def(field_type *types, my_size_t size)
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: m_type(new unsigned char [size]), m_size(size)
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{
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if (m_type)
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memcpy(m_type, types, size);
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else
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m_size= 0;
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}
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~table_def() {
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if (m_type)
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delete [] m_type;
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#ifndef DBUG_OFF
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m_type= 0;
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m_size= 0;
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#endif
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}
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/**
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Return the number of fields there is type data for.
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@return The number of fields that there is type data for.
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*/
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my_size_t size() const { return m_size; }
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/*
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Return a representation of the type data for one field.
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@param index Field index to return data for
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@return Will return a representation of the type data for field
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<code>index</code>. Currently, only the type identifier is
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returned.
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*/
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field_type type(my_ptrdiff_t index) const
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{
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DBUG_ASSERT(0 <= index);
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DBUG_ASSERT(static_cast<my_size_t>(index) < m_size);
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return m_type[index];
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}
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/**
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Decide if the table definition is compatible with a table.
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Compare the definition with a table to see if it is compatible
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with it.
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A table definition is compatible with a table if:
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- the columns types of the table definition is a (not
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necessarily proper) prefix of the column type of the table, or
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- the other way around
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@param rli Pointer to relay log info
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@param table Pointer to table to compare with.
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@retval 1 if the table definition is not compatible with @c table
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@retval 0 if the table definition is compatible with @c table
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*/
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int compatible_with(RELAY_LOG_INFO const *rli, TABLE *table) const;
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private:
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my_size_t m_size; // Number of elements in the types array
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field_type *m_type; // Array of type descriptors
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};
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/**
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Extend the normal table list with a few new fields needed by the
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slave thread, but nowhere else.
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*/
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struct RPL_TABLE_LIST
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: public st_table_list
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{
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bool m_tabledef_valid;
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table_def m_tabledef;
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};
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#endif /* RPL_UTILITY_H */
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