1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
|
#ifndef SQL_UDF_INCLUDED
#define SQL_UDF_INCLUDED
/* Copyright (c) 2000, 2003-2007 MySQL AB, 2009 Sun Microsystems, Inc.
Use is subject to license terms.
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
the Free Software Foundation; version 2 of the License.
This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.
You should have received a copy of the GNU General Public License
along with this program; if not, write to the Free Software
Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1335 USA */
/* This file defines structures needed by udf functions */
#ifdef USE_PRAGMA_INTERFACE
#pragma interface
#endif
enum Item_udftype {UDFTYPE_FUNCTION=1,UDFTYPE_AGGREGATE};
typedef void (*Udf_func_clear)(UDF_INIT *, uchar *, uchar *);
typedef void (*Udf_func_add)(UDF_INIT *, UDF_ARGS *, uchar *, uchar *);
typedef void (*Udf_func_deinit)(UDF_INIT*);
typedef my_bool (*Udf_func_init)(UDF_INIT *, UDF_ARGS *, char *);
typedef void (*Udf_func_any)();
typedef double (*Udf_func_double)(UDF_INIT *, UDF_ARGS *, uchar *, uchar *);
typedef longlong (*Udf_func_longlong)(UDF_INIT *, UDF_ARGS *, uchar *,
uchar *);
typedef struct st_udf_func
{
LEX_STRING name;
Item_result returns;
Item_udftype type;
char *dl;
void *dlhandle;
Udf_func_any func;
Udf_func_init func_init;
Udf_func_deinit func_deinit;
Udf_func_clear func_clear;
Udf_func_add func_add;
ulong usage_count;
} udf_func;
class Item_result_field;
class udf_handler :public Sql_alloc
{
protected:
udf_func *u_d;
String *buffers;
UDF_ARGS f_args;
UDF_INIT initid;
char *num_buffer;
uchar error, is_null;
bool initialized;
Item **args;
public:
bool not_original;
udf_handler(udf_func *udf_arg) :u_d(udf_arg), buffers(0), error(0),
is_null(0), initialized(0), not_original(0)
{}
~udf_handler();
const char *name() const { return u_d ? u_d->name.str : "?"; }
Item_result result_type () const
{ return u_d ? u_d->returns : STRING_RESULT;}
bool get_arguments();
bool fix_fields(THD *thd, Item_func_or_sum *item,
uint arg_count, Item **args);
void cleanup();
double val(my_bool *null_value)
{
is_null= 0;
if (get_arguments())
{
*null_value=1;
return 0.0;
}
Udf_func_double func= (Udf_func_double) u_d->func;
double tmp=func(&initid, &f_args, &is_null, &error);
if (is_null || error)
{
*null_value=1;
return 0.0;
}
*null_value=0;
return tmp;
}
longlong val_int(my_bool *null_value)
{
is_null= 0;
if (get_arguments())
{
*null_value=1;
return 0;
}
Udf_func_longlong func= (Udf_func_longlong) u_d->func;
longlong tmp=func(&initid, &f_args, &is_null, &error);
if (is_null || error)
{
*null_value=1;
return 0;
}
*null_value=0;
return tmp;
}
my_decimal *val_decimal(my_bool *null_value, my_decimal *dec_buf);
void clear()
{
is_null= 0;
Udf_func_clear func= u_d->func_clear;
func(&initid, &is_null, &error);
}
void add(my_bool *null_value)
{
if (get_arguments())
{
*null_value=1;
return;
}
Udf_func_add func= u_d->func_add;
func(&initid, &f_args, &is_null, &error);
*null_value= (my_bool) (is_null || error);
}
String *val_str(String *str,String *save_str);
};
#ifdef HAVE_DLOPEN
void udf_init(void),udf_free(void);
udf_func *find_udf(const char *name, uint len=0,bool mark_used=0);
void free_udf(udf_func *udf);
int mysql_create_function(THD *thd,udf_func *udf);
enum drop_udf_result
{
UDF_DEL_RESULT_ABSENT,
UDF_DEL_RESULT_DELETED,
UDF_DEL_RESULT_ERROR
};
enum drop_udf_result mysql_drop_function(THD *thd,const LEX_STRING *name);
#else
static inline void udf_init(void) { }
static inline void udf_free(void) { }
#endif
#endif /* SQL_UDF_INCLUDED */
|
