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126 lines
3.6 KiB
126 lines
3.6 KiB
using Apewer.Internals;
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using System;
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using System.Collections.Generic;
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using System.Reflection;
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using System.Text;
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namespace Apewer.Source
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{
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/// <summary>数据库中的列,类型默认为 NVarChar(255),错误类型将修正为 NText。</summary>
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[Serializable]
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[AttributeUsage(AttributeTargets.Property, AllowMultiple = false, Inherited = true)]
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public sealed class ColumnAttribute : Attribute
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{
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private PropertyInfo _property = null;
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private string _field = "";
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private int _length = 0;
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private ColumnType _type;
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private bool _independent = false;
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private bool _locked = false;
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/// <summary>使用自动的列名称。当类型为 VarChar 或 NVarChar 时必须指定长度。</summary>
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/// <exception cref="System.ArgumentException"></exception>
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public ColumnAttribute(ColumnType type = ColumnType.NVarChar255, int length = 0)
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{
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New(null, type, length, true);
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}
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/// <summary>使用指定的列名称。当类型为 VarChar 或 NVarChar 时必须指定长度。</summary>
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/// <exception cref="System.ArgumentException"></exception>
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public ColumnAttribute(string field, ColumnType type = ColumnType.NVarChar255, int length = 0)
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{
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New(field, type, length, false);
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}
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internal ColumnAttribute(string field, ColumnType type, int length, bool underline)
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{
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New(field, type, length, underline);
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}
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/// <summary>属性。</summary>
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public PropertyInfo Property
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{
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get { return _property; }
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internal set
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{
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if (_locked) return;
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_property = value;
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}
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}
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/// <summary>字段名。</summary>
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public string Field
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{
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get { return _field; }
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set
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{
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if (_locked) return;
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_field = value;
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}
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}
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/// <summary>指定字段的最大长度。</summary>
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public int Length
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{
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get { return _length; }
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set
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{
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if (_locked) return;
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_length = value;
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}
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}
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/// <summary>字段类型。</summary>
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public ColumnType Type
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{
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get { return _type; }
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set
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{
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if (_locked) return;
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_type = value;
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}
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}
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/// <summary>Independent 特性。</summary>
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public bool Independent
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{
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get { return _independent; }
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internal set { _independent = value; }
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}
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/// <exception cref="System.ArgumentException"></exception>
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private void New(string field, ColumnType type, int length, bool underline)
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{
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_field = string.IsNullOrEmpty(field) ? "" : TableStructure.RestrictName(field, underline);
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_type = type;
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switch (type)
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{
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case ColumnType.VarChar:
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case ColumnType.NVarChar:
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if (length < 1) throw new ArgumentException("最大长度无效。");
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_length = length;
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break;
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case ColumnType.VarChar255:
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case ColumnType.NVarChar255:
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_length = 255;
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break;
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default:
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_length = length;
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break;
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}
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}
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/// <summary>锁定属性,阻止修改。</summary>
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public void Lock()
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{
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_locked = true;
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}
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}
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}
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