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
|
using System.Diagnostics;
using System.Reflection;
using System.Text;
namespace CrupestApi.Commons.Crud;
public class ColumnHooks
{
public delegate void ColumnHookAction(ColumnInfo column, ref object? value);
public ColumnHooks(ColumnHookAction afterSelect, ColumnHookAction beforeInsert, ColumnHookAction beforeUpdate)
{
AfterSelect = afterSelect;
BeforeInsert = beforeInsert;
BeforeUpdate = beforeUpdate;
}
// Called after SELECT.
public ColumnHookAction AfterSelect;
// Called before INSERT.
public ColumnHookAction BeforeInsert;
// Called before UPDATE
public ColumnHookAction BeforeUpdate;
}
public class ColumnInfo
{
private readonly AggregateColumnMetadata _metadata = new AggregateColumnMetadata();
public ColumnInfo(TableInfo table, IColumnMetadata metadata, Type clrType, IColumnTypeProvider typeProvider)
{
Table = table;
_metadata.Add(metadata);
ColumnType = typeProvider.Get(clrType);
Hooks = new ColumnHooks(
new ColumnHooks.ColumnHookAction(OnAfterSelect),
new ColumnHooks.ColumnHookAction(OnBeforeInsert),
new ColumnHooks.ColumnHookAction(OnBeforeUpdate)
);
}
public ColumnInfo(TableInfo table, PropertyInfo propertyInfo, IColumnTypeProvider typeProvider)
{
Table = table;
ColumnType = typeProvider.Get(propertyInfo.PropertyType);
var columnAttribute = propertyInfo.GetCustomAttribute<ColumnAttribute>();
if (columnAttribute is not null)
{
_metadata.Add(columnAttribute);
}
Hooks = new ColumnHooks(
new ColumnHooks.ColumnHookAction(OnAfterSelect),
new ColumnHooks.ColumnHookAction(OnBeforeInsert),
new ColumnHooks.ColumnHookAction(OnBeforeUpdate)
);
}
public TableInfo Table { get; }
// If null, there is no corresponding property.
public PropertyInfo? PropertyInfo { get; } = null;
public IColumnMetadata Metadata => _metadata;
public IColumnTypeInfo ColumnType { get; }
public ColumnHooks Hooks { get; }
private void TryCoerceStringFromNullToEmpty(ref object? value)
{
if (ColumnType.ClrType == typeof(string) && (Metadata.GetValueOrDefault<bool?>(ColumnMetadataKeys.DefaultEmptyForString) ?? false) && value is null)
{
value = "";
}
}
protected void OnAfterSelect(ColumnInfo column, ref object? value)
{
TryCoerceStringFromNullToEmpty(ref value);
}
protected void OnBeforeInsert(ColumnInfo column, ref object? value)
{
TryCoerceStringFromNullToEmpty(ref value);
if (column.IsNotNull && !column.IsAutoIncrement)
{
throw new Exception($"Column {column.ColumnName} can't be empty.");
}
}
protected void OnBeforeUpdate(ColumnInfo column, ref object? value)
{
TryCoerceStringFromNullToEmpty(ref value);
}
public string ColumnName
{
get
{
object? value = Metadata.GetValueOrDefault(ColumnMetadataKeys.ColumnName);
Debug.Assert(value is null || value is string);
return (string?)value ?? PropertyInfo?.Name ?? throw new Exception("Failed to get column name.");
}
}
public bool IsPrimaryKey => Metadata.GetValueOrDefault(ColumnMetadataKeys.IsPrimaryKey) is true;
public bool IsAutoIncrement => Metadata.GetValueOrDefault(ColumnMetadataKeys.IsAutoIncrement) is true;
public bool IsNotNull => IsPrimaryKey || Metadata.GetValueOrDefault(ColumnMetadataKeys.NotNull) is true;
public ColumnIndexType Index => Metadata.GetValueOrDefault<ColumnIndexType?>(ColumnMetadataKeys.Index) ?? ColumnIndexType.None;
public string GenerateCreateTableColumnString(string? dbProviderId = null)
{
StringBuilder result = new StringBuilder();
result.Append(ColumnName);
result.Append(' ');
result.Append(ColumnType.GetSqlTypeString(dbProviderId));
if (IsPrimaryKey)
{
result.Append(' ');
result.Append("PRIMARY KEY");
}
else if (IsNotNull)
{
result.Append(' ');
result.Append(" NOT NULL");
}
if (IsAutoIncrement)
{
result.Append(' ');
result.Append("AUTOINCREMENT");
}
return result.ToString();
}
}
|
