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sql_udf.h
#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_CSTRING name; Item_result returns; Item_udftype type; const 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; Udf_func_add func_remove; 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); } bool supports_removal() const { return MY_TEST(u_d->func_remove); } void remove(my_bool *null_value) { DBUG_ASSERT(u_d->func_remove); if (get_arguments()) { *null_value=1; return; } Udf_func_add func= u_d->func_remove; func(&initid, &f_args, &is_null, &error); *null_value= (my_bool) (is_null || error); } String *val_str(String *str,String *save_str); udf_handler(const udf_handler &orig) { u_d = orig.u_d; buffers = orig.buffers; f_args = orig.f_args; initid = orig.initid; num_buffer = orig.num_buffer; error = orig.error; is_null = orig.is_null; initialized = orig.initialized; args = orig.args; not_original = true; } }; #ifdef HAVE_DLOPEN void udf_init(void),udf_free(void); udf_func *find_udf(const char *name, size_t size, 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_CSTRING *name); #else static inline void udf_init(void) { } static inline void udf_free(void) { } #endif #endif /* SQL_UDF_INCLUDED */
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