diff options
Diffstat (limited to 'sql/field.h')
| -rw-r--r-- | sql/field.h | 39 |
1 files changed, 23 insertions, 16 deletions
diff --git a/sql/field.h b/sql/field.h index 5ac1b35fd81..ce92e75ae61 100644 --- a/sql/field.h +++ b/sql/field.h @@ -1,4 +1,4 @@ -/* Copyright 2000-2008 MySQL AB, 2008 Sun Microsystems, Inc. +/* Copyright 2000-2008 MySQL AB, 2008, 2009 Sun Microsystems, Inc. This program is free software; you can redistribute it and/or modify it under the terms of the GNU General Public License as published by @@ -472,6 +472,13 @@ public: /* maximum possible display length */ virtual uint32 max_display_length()= 0; + /** + Whether a field being created is compatible with a existing one. + + Used by the ALTER TABLE code to evaluate whether the new definition + of a table is compatible with the old definition so that it can + determine if data needs to be copied over (table data change). + */ virtual uint is_equal(Create_field *new_field); /* convert decimal to longlong with overflow check */ longlong convert_decimal2longlong(const my_decimal *val, bool unsigned_flag, @@ -603,15 +610,17 @@ protected: handle_int64(to, from, low_byte_first_from, table->s->db_low_byte_first); return from + sizeof(int64); } + + bool field_flags_are_binary() + { + return (flags & (BINCMP_FLAG | BINARY_FLAG)) != 0; + } + }; class Field_num :public Field { public: - /** - The scale of the Field's value, i.e. the number of digits to the right - of the decimal point. - */ const uint8 dec; bool zerofill,unsigned_flag; // Purify cannot handle bit fields Field_num(uchar *ptr_arg,uint32 len_arg, uchar *null_ptr_arg, @@ -662,7 +671,6 @@ public: friend class Create_field; my_decimal *val_decimal(my_decimal *); virtual bool str_needs_quotes() { return TRUE; } - bool compare_str_field_flags(Create_field *new_field, uint32 flags); uint is_equal(Create_field *new_field); }; @@ -770,11 +778,6 @@ public: Field_new_decimal(uint32 len_arg, bool maybe_null_arg, const char *field_name_arg, uint8 dec_arg, bool unsigned_arg); - /* - Create a field to hold a decimal value from an item. - Truncates the precision and/or scale if necessary. - */ - static Field_new_decimal *new_decimal_field(const Item *item); enum_field_types type() const { return MYSQL_TYPE_NEWDECIMAL;} enum ha_base_keytype key_type() const { return HA_KEYTYPE_BINARY; } Item_result result_type () const { return DECIMAL_RESULT; } @@ -1277,12 +1280,12 @@ public: Field_date(uchar *ptr_arg, uchar *null_ptr_arg, uchar null_bit_arg, enum utype unireg_check_arg, const char *field_name_arg, CHARSET_INFO *cs) - :Field_str(ptr_arg, 10, null_ptr_arg, null_bit_arg, + :Field_str(ptr_arg, MAX_DATE_WIDTH, null_ptr_arg, null_bit_arg, unireg_check_arg, field_name_arg, cs) {} Field_date(bool maybe_null_arg, const char *field_name_arg, CHARSET_INFO *cs) - :Field_str((uchar*) 0,10, maybe_null_arg ? (uchar*) "": 0,0, + :Field_str((uchar*) 0, MAX_DATE_WIDTH, maybe_null_arg ? (uchar*) "": 0,0, NONE, field_name_arg, cs) {} enum_field_types type() const { return MYSQL_TYPE_DATE;} enum ha_base_keytype key_type() const { return HA_KEYTYPE_ULONG_INT; } @@ -1392,12 +1395,12 @@ public: Field_datetime(uchar *ptr_arg, uchar *null_ptr_arg, uchar null_bit_arg, enum utype unireg_check_arg, const char *field_name_arg, CHARSET_INFO *cs) - :Field_str(ptr_arg, 19, null_ptr_arg, null_bit_arg, + :Field_str(ptr_arg, MAX_DATETIME_WIDTH, null_ptr_arg, null_bit_arg, unireg_check_arg, field_name_arg, cs) {} Field_datetime(bool maybe_null_arg, const char *field_name_arg, CHARSET_INFO *cs) - :Field_str((uchar*) 0,19, maybe_null_arg ? (uchar*) "": 0,0, + :Field_str((uchar*) 0, MAX_DATETIME_WIDTH, maybe_null_arg ? (uchar*) "": 0,0, NONE, field_name_arg, cs) {} enum_field_types type() const { return MYSQL_TYPE_DATETIME;} #ifdef HAVE_LONG_LONG @@ -1862,7 +1865,6 @@ public: CHARSET_INFO *sort_charset(void) const { return &my_charset_bin; } private: int do_save_field_metadata(uchar *first_byte); - bool compare_enum_values(TYPELIB *values); uint is_equal(Create_field *new_field); }; @@ -2070,6 +2072,11 @@ public: Item *on_update_value, LEX_STRING *comment, char *change, List<String> *interval_list, CHARSET_INFO *cs, uint uint_geom_type); + + bool field_flags_are_binary() + { + return (flags & (BINCMP_FLAG | BINARY_FLAG)) != 0; + } }; |