Multiple column Mapping-opracowanie

Multiple column Mapping
• During plugin initialization, when InnoDB memcached is configured with information defined in the
containers table, each mapped column that is parsed from value_columns is verified against
the mapped table. If multiple columns are mapped, there is a check to ensure that each column
exists and is the right type.
• At run-time, for memcached insert operations, if there are more delimiters in the value than the
number of mapped columns, only the number of mapped values are taken. For example, if there are
6 mapped columns and 7 delimited values are provided, only the first 6 delimited values are taken.
The 7th delimited value is ignored.
• If there are fewer delimited values than mapped columns, unfilled columns are set to NULL. If an
unfilled column cannot be NULL, the insert will fail.
• If a table has more columns than mapped values, the extra columns do not affect output results.
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