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comparison Source/Data/Sql/SqlValue.cs @ 0:f990fcb411a9

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Копия текущей версии из github
author cin
date Thu, 27 Mar 2014 21:46:09 +0400
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-1:000000000000 0:f990fcb411a9
1 using System;
2 using System.Collections.Generic;
3 using System.Text;
4
5 namespace BLToolkit.Data.Sql
6 {
7 public class SqlValue : SqlValueBase, ISqlExpression
8 {
9 public SqlValue(Type systemType, object value)
10 {
11 _systemType = systemType;
12 _value = value;
13 }
14
15 public SqlValue(object value)
16 {
17 _value = value;
18
19 if (value != null)
20 _systemType = value.GetType();
21 }
22
23 public override object Value
24 {
25 get
26 {
27 var rv = base.Value;
28
29 if (rv != null && rv.GetType() != _systemType)
30 {
31 _systemType = rv.GetType();
32 }
33
34 return rv;
35 }
36 }
37
38 Type _systemType; public Type SystemType { get { return _systemType; } }
39
40 #region Overrides
41
42 #if OVERRIDETOSTRING
43
44 public override string ToString()
45 {
46 return ((IQueryElement)this).ToString(new StringBuilder(), new Dictionary<IQueryElement,IQueryElement>()).ToString();
47 }
48
49 #endif
50
51 #endregion
52
53 #region ISqlExpression Members
54
55 public int Precedence
56 {
57 get { return Sql.Precedence.Primary; }
58 }
59
60 #endregion
61
62 #region ISqlExpressionWalkable Members
63
64 ISqlExpression ISqlExpressionWalkable.Walk(bool skipColumns, Func<ISqlExpression,ISqlExpression> func)
65 {
66 return func(this);
67 }
68
69 #endregion
70
71 #region IEquatable<ISqlExpression> Members
72
73 bool IEquatable<ISqlExpression>.Equals(ISqlExpression other)
74 {
75 if (this == other)
76 return true;
77
78 var value = other as SqlValue;
79 return
80 value != null &&
81 _systemType == value._systemType &&
82 (_value == null && value._value == null || _value != null && _value.Equals(value._value));
83 }
84
85 #endregion
86
87 #region ISqlExpression Members
88
89 public bool CanBeNull()
90 {
91 return Value == null;
92 }
93
94 public bool Equals(ISqlExpression other, Func<ISqlExpression, ISqlExpression, bool> comparer)
95 {
96 return ((ISqlExpression)this).Equals(other) && comparer(this, other);
97 }
98
99 #endregion
100
101 #region ICloneableElement Members
102
103 public ICloneableElement Clone(Dictionary<ICloneableElement, ICloneableElement> objectTree, Predicate<ICloneableElement> doClone)
104 {
105 if (!doClone(this))
106 return this;
107
108 ICloneableElement clone;
109
110 if (!objectTree.TryGetValue(this, out clone))
111 objectTree.Add(this, clone = new SqlValue(_systemType, _value));
112
113 return clone;
114 }
115
116 #endregion
117
118 #region IQueryElement Members
119
120 public QueryElementType ElementType { get { return QueryElementType.SqlValue; } }
121
122 StringBuilder IQueryElement.ToString(StringBuilder sb, Dictionary<IQueryElement,IQueryElement> dic)
123 {
124 return
125 Value == null ?
126 sb.Append("NULL") :
127 Value is string ?
128 sb
129 .Append('\'')
130 .Append(Value.ToString().Replace("\'", "''"))
131 .Append('\'')
132 :
133 sb.Append(Value);
134 }
135
136 #endregion
137 }
138 }