Create_field Class Reference

Inheritance diagram for Create_field:

List of all members.

Public Member Functions
	Create_field (Field *field, Field *orig_field)
Create_field *	clone (MEM_ROOT *mem_root) const
void	create_length_to_internal_length (void)
void	init_for_tmp_table (enum_field_types sql_type_arg, uint32 max_length, uint32 decimals, bool maybe_null, bool is_unsigned, uint pack_length=~0U)
bool	init (THD *thd, const char *field_name, enum_field_types type, const char *length, const char *decimals, uint type_modifier, Item *default_value, Item *on_update_value, LEX_STRING *comment, const char *change, List< String > *interval_list, const CHARSET_INFO *cs, uint uint_geom_type)
ha_storage_media	field_storage_type () const
column_format_type	column_format () const
Public Attributes
const char *	field_name
const char *	change
const char *	after
LEX_STRING	comment
Item *	def
enum enum_field_types	sql_type
ulong	length
uint32	char_length
uint	decimals
uint	flags
uint	pack_length
uint	key_length
Field::utype	unireg_check
TYPELIB *	interval
TYPELIB *	save_interval
List< String >	interval_list
const CHARSET_INFO *	charset
Field::geometry_type	geom_type
Field *	field
uint8	row
uint8	col
uint8	sc_length
uint8	interval_id
uint	offset
uint	pack_flag

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Constructor & Destructor Documentation

Create_field::Create_field	(	Field *	old_field,
		Field *	orig_field
	)

Constructs a column definition from an actual column object. This is a reverse-engineering procedure that creates a column definition object as produced by the parser (Create_field) from a resolved column object (Field).

Parameters:

old_field	The column object from which the column definition is constructed.
orig_field	Used for copying default values. This parameter may be NULL, but if present it is used for copying default values.

Default values are copied into an Item_string unless:

• The default value is a function.
• There is no default value.
• old_field is a BLOB column.
• old_field has its data pointer improperly initialized.

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Member Function Documentation

void Create_field::create_length_to_internal_length

(

void

)

Convert create_field::length from number of characters to number of bytes.

bool Create_field::init	(	THD *	thd,
		const char *	fld_name,
		enum_field_types	fld_type,
		const char *	fld_length,
		const char *	fld_decimals,
		uint	fld_type_modifier,
		Item *	fld_default_value,
		Item *	fld_on_update_value,
		LEX_STRING *	fld_comment,
		const char *	fld_change,
		List< String > *	fld_interval_list,
		const CHARSET_INFO *	fld_charset,
		uint	fld_geom_type
	)

Initialize a column definition object. Column definition objects can be used to construct Field objects.

Parameters:

thd	Session/Thread handle.
fld_name	Column name.
fld_type	Column type.
fld_length	Column length.
fld_decimals	Number of digits to the right of the decimal point (if any.)
fld_type_modifier	Additional type information.
fld_default_value	Column default expression (if any.)
fld_on_update_value	The expression in the ON UPDATE clause.
fld_comment	Column comment.
fld_change	Column change.
fld_interval_list	Interval list (if any.)
fld_charset	Column charset.
fld_geom_type	Column geometry type (if any.)

Return values:

FALSE	on success.
TRUE	on error.

void Create_field::init_for_tmp_table	(	enum_field_types	sql_type_arg,
		uint32	length_arg,
		uint32	decimals_arg,
		bool	maybe_null,
		bool	is_unsigned,
		uint	pack_length_arg = ~0U
	)

Init for a tmp table field. To be extended if need be.

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Member Data Documentation

Item* Create_field::def

The declared default value, if any, otherwise NULL. Note that this member is NULL if the default is a function. If the column definition has a function declared as the default, the information is found in Create_field::unireg_check.

See also:

Create_field::unireg_check

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The documentation for this class was generated from the following files:

• field.h
• field.cc