Drizzled Public API Documentation

multiply.cc
1 /* -*- mode: c++; c-basic-offset: 2; indent-tabs-mode: nil; -*-
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3  *
4  * Copyright (C) 2008 Sun Microsystems, Inc.
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6  * This program is free software; you can redistribute it and/or modify
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8  * the Free Software Foundation; version 2 of the License.
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13  * GNU General Public License for more details.
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15  * You should have received a copy of the GNU General Public License
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17  * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
18  */
19 
20 #include <config.h>
21 
22 #include <drizzled/function/math/multiply.h>
23 
24 #include <algorithm>
25 
26 using namespace std;
27 
28 namespace drizzled
29 {
30 
31 double Item_func_mul::real_op()
32 {
33  assert(fixed == 1);
34  double value= args[0]->val_real() * args[1]->val_real();
35  if ((null_value=args[0]->null_value || args[1]->null_value))
36  return 0.0;
37  return fix_result(value);
38 }
39 
40 
41 int64_t Item_func_mul::int_op()
42 {
43  assert(fixed == 1);
44  int64_t value=args[0]->val_int()*args[1]->val_int();
45  if ((null_value=args[0]->null_value || args[1]->null_value))
46  return 0;
47  return value;
48 }
49 
50 
53 type::Decimal *Item_func_mul::decimal_op(type::Decimal *decimal_value)
54 {
55  type::Decimal value1, *val1;
56  type::Decimal value2, *val2;
57  val1= args[0]->val_decimal(&value1);
58  if ((null_value= args[0]->null_value))
59  return 0;
60  val2= args[1]->val_decimal(&value2);
61  if (!(null_value= (args[1]->null_value ||
62  (class_decimal_mul(E_DEC_FATAL_ERROR, decimal_value, val1,
63  val2) > 3))))
64  return decimal_value;
65  return 0;
66 }
67 
68 
69 void Item_func_mul::result_precision()
70 {
71  /* Integer operations keep unsigned_flag if one of arguments is unsigned */
72  if (result_type() == INT_RESULT)
73  unsigned_flag= args[0]->unsigned_flag | args[1]->unsigned_flag;
74  else
75  unsigned_flag= args[0]->unsigned_flag & args[1]->unsigned_flag;
76 
77  decimals= min(args[0]->decimals + args[1]->decimals, DECIMAL_MAX_SCALE);
78  int precision= min(args[0]->decimal_precision() + args[1]->decimal_precision(),
79  (unsigned int)DECIMAL_MAX_PRECISION);
80  max_length= class_decimal_precision_to_length(precision, decimals,unsigned_flag);
81 }
82 
83 } /* namespace drizzled */