diff options
Diffstat (limited to 'sql/field.cc')
| -rw-r--r-- | sql/field.cc | 122 |
1 files changed, 122 insertions, 0 deletions
diff --git a/sql/field.cc b/sql/field.cc index 70b8ce6c080..9b8e386fdc5 100644 --- a/sql/field.cc +++ b/sql/field.cc @@ -169,6 +169,128 @@ static inline uint field_length_without_space(const char *ptr, uint length) return (uint) (end-ptr); } +/* + Tables of filed type compatibility. + + There are tables for every type, table consist of list of types in which + given type can be converted without data lost, list should be ended with + FIELD_CAST_STOP +*/ +static Field::field_cast_enum field_cast_decimal[]= +{Field::FIELD_CAST_STRING, Field::FIELD_CAST_VARSTRING, + Field::FIELD_CAST_BLOB, Field::FIELD_CAST_STOP}; +static Field::field_cast_enum field_cast_tiny[]= +{Field::FIELD_CAST_SHORT, Field::FIELD_CAST_MEDIUM, Field::FIELD_CAST_LONG, + Field::FIELD_CAST_LONGLONG, + Field::FIELD_CAST_FLOAT, Field::FIELD_CAST_DOUBLE, + Field::FIELD_CAST_STRING, Field::FIELD_CAST_VARSTRING, + Field::FIELD_CAST_BLOB, Field::FIELD_CAST_STOP}; +static Field::field_cast_enum field_cast_short[]= +{Field::FIELD_CAST_MEDIUM, Field::FIELD_CAST_LONG, Field::FIELD_CAST_LONGLONG, + Field::FIELD_CAST_FLOAT, Field::FIELD_CAST_DOUBLE, + Field::FIELD_CAST_STRING, Field::FIELD_CAST_VARSTRING, + Field::FIELD_CAST_BLOB, Field::FIELD_CAST_STOP}; +static Field::field_cast_enum field_cast_medium[]= +{Field::FIELD_CAST_LONG, Field::FIELD_CAST_LONGLONG, + Field::FIELD_CAST_DOUBLE, + Field::FIELD_CAST_STRING, Field::FIELD_CAST_VARSTRING, + Field::FIELD_CAST_BLOB, Field::FIELD_CAST_STOP}; +static Field::field_cast_enum field_cast_long[]= +{Field::FIELD_CAST_LONGLONG, + Field::FIELD_CAST_DOUBLE, + Field::FIELD_CAST_STRING, Field::FIELD_CAST_VARSTRING, + Field::FIELD_CAST_BLOB, Field::FIELD_CAST_STOP}; +static Field::field_cast_enum field_cast_longlong[]= +{Field::FIELD_CAST_DOUBLE, + Field::FIELD_CAST_STRING, Field::FIELD_CAST_VARSTRING, + Field::FIELD_CAST_BLOB, Field::FIELD_CAST_STOP}; +static Field::field_cast_enum field_cast_float[]= +{Field::FIELD_CAST_DOUBLE, + Field::FIELD_CAST_STRING, Field::FIELD_CAST_VARSTRING, + Field::FIELD_CAST_BLOB, Field::FIELD_CAST_STOP}; +static Field::field_cast_enum field_cast_double[]= +{Field::FIELD_CAST_STRING, Field::FIELD_CAST_VARSTRING, + Field::FIELD_CAST_BLOB, Field::FIELD_CAST_STOP}; +static Field::field_cast_enum field_cast_null[]= +{Field::FIELD_CAST_DECIMAL, Field::FIELD_CAST_TINY, Field::FIELD_CAST_SHORT, + Field::FIELD_CAST_MEDIUM, Field::FIELD_CAST_LONG, Field::FIELD_CAST_LONGLONG, + Field::FIELD_CAST_FLOAT, Field::FIELD_CAST_DOUBLE, + Field::FIELD_CAST_TIMESTAMP, Field::FIELD_CAST_YEAR, + Field::FIELD_CAST_DATE, Field::FIELD_CAST_NEWDATE, + Field::FIELD_CAST_TIME, Field::FIELD_CAST_DATETIME, + Field::FIELD_CAST_STRING, Field::FIELD_CAST_VARSTRING, + Field::FIELD_CAST_BLOB, + Field::FIELD_CAST_GEOM, Field::FIELD_CAST_ENUM, Field::FIELD_CAST_SET, + Field::FIELD_CAST_STOP}; +static Field::field_cast_enum field_cast_timestamp[]= +{Field::FIELD_CAST_DATETIME, + Field::FIELD_CAST_STRING, Field::FIELD_CAST_VARSTRING, + Field::FIELD_CAST_BLOB, Field::FIELD_CAST_STOP}; +static Field::field_cast_enum field_cast_year[]= +{Field::FIELD_CAST_SHORT, Field::FIELD_CAST_MEDIUM, Field::FIELD_CAST_LONG, + Field::FIELD_CAST_LONGLONG, + Field::FIELD_CAST_FLOAT, Field::FIELD_CAST_DOUBLE, + Field::FIELD_CAST_STRING, Field::FIELD_CAST_VARSTRING, + Field::FIELD_CAST_BLOB, Field::FIELD_CAST_STOP}; +static Field::field_cast_enum field_cast_date[]= +{Field::FIELD_CAST_DATETIME, + Field::FIELD_CAST_STRING, Field::FIELD_CAST_VARSTRING, + Field::FIELD_CAST_BLOB, Field::FIELD_CAST_STOP}; +static Field::field_cast_enum field_cast_newdate[]= +{Field::FIELD_CAST_DATETIME, + Field::FIELD_CAST_STRING, Field::FIELD_CAST_VARSTRING, + Field::FIELD_CAST_BLOB, Field::FIELD_CAST_STOP}; +static Field::field_cast_enum field_cast_time[]= +{Field::FIELD_CAST_DATETIME, + Field::FIELD_CAST_STRING, Field::FIELD_CAST_VARSTRING, + Field::FIELD_CAST_BLOB, Field::FIELD_CAST_STOP}; +static Field::field_cast_enum field_cast_datetime[]= +{Field::FIELD_CAST_STRING, Field::FIELD_CAST_VARSTRING, + Field::FIELD_CAST_BLOB, Field::FIELD_CAST_STOP}; +static Field::field_cast_enum field_cast_string[]= +{Field::FIELD_CAST_VARSTRING, Field::FIELD_CAST_BLOB, Field::FIELD_CAST_STOP}; +static Field::field_cast_enum field_cast_varstring[]= +{Field::FIELD_CAST_BLOB, Field::FIELD_CAST_STOP}; +static Field::field_cast_enum field_cast_blob[]= +{Field::FIELD_CAST_STOP}; +static Field::field_cast_enum field_cast_geom[]= +{Field::FIELD_CAST_STOP}; +static Field::field_cast_enum field_cast_enum[]= +{Field::FIELD_CAST_STRING, Field::FIELD_CAST_VARSTRING, + Field::FIELD_CAST_BLOB, Field::FIELD_CAST_STOP}; +static Field::field_cast_enum field_cast_set[]= +{Field::FIELD_CAST_STRING, Field::FIELD_CAST_VARSTRING, + Field::FIELD_CAST_BLOB, Field::FIELD_CAST_STOP}; +// Array of pointers on conversion table for all fields types casting +static Field::field_cast_enum *field_cast_array[]= +{0, //FIELD_CAST_STOP + field_cast_decimal, field_cast_tiny, field_cast_short, + field_cast_medium, field_cast_long, field_cast_longlong, + field_cast_float, field_cast_double, + field_cast_null, + field_cast_timestamp, field_cast_year, field_cast_date, field_cast_newdate, + field_cast_time, field_cast_datetime, + field_cast_string, field_cast_varstring, field_cast_blob, + field_cast_geom, field_cast_enum, field_cast_set +}; + + +bool Field::field_cast_compatible(Field::field_cast_enum type) +{ + DBUG_ASSERT(type != FIELD_CAST_STOP); + Field::field_cast_enum *array= field_cast_array[field_cast_type()]; + uint i= 0; + Field::field_cast_enum tp; + do + { + tp= array[i++]; + if (tp == type) + return 1; + } while (tp != FIELD_CAST_STOP); + return 0; +} + + /**************************************************************************** ** Functions for the base classes ** This is an unpacked number. |