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MySQL 5.1: udf_handler Class Reference

udf_handler Class Reference

#include <sql_udf.h>

Inheritance diagram for udf_handler:

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[legend]List of all members.


Public Member Functions
	udf_handler (udf_func *udf_arg)
	~udf_handler ()
const char *	name () const
Item_result	result_type () const
bool	get_arguments ()
bool	fix_fields (THD thd, Item_result_field item, uint arg_count, Item **args)
void	cleanup ()
double	val (my_bool *null_value)
longlong	val_int (my_bool *null_value)
my_decimal *	val_decimal (my_bool null_value, my_decimal dec_buf)
void	clear ()
void	add (my_bool *null_value)
String *	val_str (String str, String save_str)
Public Attributes
table_map	used_tables_cache
bool	const_item_cache
bool	not_original
Protected Attributes
udf_func *	u_d
String *	buffers
UDF_ARGS	f_args
UDF_INIT	initid
char *	num_buffer
uchar	error
uchar	is_null
bool	initialized
Item **	args

Detailed Description

Definition at line 53 of file sql_udf.h.

Constructor & Destructor Documentation

udf_handler::udf_handler ( udf_func * udf_arg ) [inline]

Definition at line 69 of file sql_udf.h.

00069                                  :u_d(udf_arg), buffers(0), error(0),
00070     is_null(0), initialized(0), not_original(0)
00071   {}

udf_handler::~udf_handler ( )

Member Function Documentation

void udf_handler::add ( my_bool * null_value ) [inline]

Definition at line 123 of file sql_udf.h.

References error, f_args, func, st_udf_func::func_add, get_arguments(), initid, is_null, and u_d.

00124   {
00125     if (get_arguments())
00126     {
00127       *null_value=1;
00128       return;
00129     }
00130     Udf_func_add func= u_d->func_add;
00131     func(&initid, &f_args, &is_null, &error);
00132     *null_value= (my_bool) (is_null || error);
00133   }

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void udf_handler::cleanup ( )

void udf_handler::clear ( ) [inline]

Definition at line 117 of file sql_udf.h.

References error, func, st_udf_func::func_clear, initid, is_null, and u_d.

00118   {
00119     is_null= 0;
00120     Udf_func_clear func= u_d->func_clear;
00121     func(&initid, &is_null, &error);
00122   }

bool udf_handler::fix_fields	(	THD *	thd,
		Item_result_field *	item,
		uint	arg_count,
		Item **	args
	)

bool udf_handler::get_arguments ( )

Definition at line 2956 of file item_func.cc.

Referenced by add(), val(), and val_int().

02956 { return 0; }

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const char* udf_handler::name ( ) const [inline]

Definition at line 73 of file sql_udf.h.

References st_udf_func::name, LEX_STRING::str, and u_d.

00073 { return u_d ? u_d->name.str : "?"; }

Item_result udf_handler::result_type ( ) const [inline]

Definition at line 74 of file sql_udf.h.

References st_udf_func::returns, STRING_RESULT, and u_d.

00075   { return u_d  ? u_d->returns : STRING_RESULT;}

double udf_handler::val ( my_bool * null_value ) [inline]

Definition at line 80 of file sql_udf.h.

References error, f_args, st_udf_func::func, func, get_arguments(), initid, is_null, and u_d.

00081   {
00082     is_null= 0;
00083     if (get_arguments())
00084     {
00085       *null_value=1;
00086       return 0.0;
00087     }
00088     Udf_func_double func= (Udf_func_double) u_d->func;
00089     double tmp=func(&initid, &f_args, &is_null, &error);
00090     if (is_null || error)
00091     {
00092       *null_value=1;
00093       return 0.0;
00094     }
00095     *null_value=0;
00096     return tmp;
00097   }

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my_decimal* udf_handler::val_decimal	(	my_bool *	null_value,
		my_decimal *	dec_buf
	)

longlong udf_handler::val_int ( my_bool * null_value ) [inline]

Definition at line 98 of file sql_udf.h.

References error, f_args, st_udf_func::func, func, get_arguments(), initid, is_null, LL, and u_d.

00099   {
00100     is_null= 0;
00101     if (get_arguments())
00102     {
00103       *null_value=1;
00104       return LL(0);
00105     }
00106     Udf_func_longlong func= (Udf_func_longlong) u_d->func;
00107     longlong tmp=func(&initid, &f_args, &is_null, &error);
00108     if (is_null || error)
00109     {
00110       *null_value=1;
00111       return LL(0);
00112     }
00113     *null_value=0;
00114     return tmp;
00115   }