public static String GetColoumName(Type type, String name)
{
if (String.IsNullOrEmpty(name))
{
throw new ArgumentException("Table对应的属性值不能为空");
}
if (!ValuePairs.ContainsKey(type))
{
lock (_lock)
{
Add(type);
}
}
EntityTableValue pairs = null;
if (ValuePairs.TryGetValue(type, out pairs))
{
return(pairs[name].ColumnName);
}
return(null);
}
/// <summary>
/// 添加类型,并缓存字段对应的所有属性
/// </summary>
/// <param name="type"></param>
public static void Add(Type type)
{
if (type == null)
{
throw new ArgumentException("类型不能为空");
}
if (!typeof(IEntity).IsAssignableFrom(type))
{
throw new ArgumentException("必须基于IEntity接口");
}
if (!ValuePairs.ContainsKey(type))
{
lock (_lock)
{
if (ValuePairs.ContainsKey(type))
{
return;
}
Type t = type;
EntityTableValue value = new EntityTableValue();
Attribute table = t.GetCustomAttribute(typeof(TableMapperAttribute));
//若没有写对应的特性,那么类名便是表名
String TableName = t.Name;
if (table != null)
{
TableName = (table as TableMapperAttribute).TableName;
}
value.Tablename = TableName;
//将字段与数据库中字段名对照起来
Dictionary <String, EntityPropertyValue> valuePairs = new Dictionary <String, EntityPropertyValue>();
foreach (PropertyInfo pi in t.GetProperties())
{
if (pi.GetCustomAttribute(typeof(IgnoreAttribute)) != null)
{
continue;
}
String name = pi.Name;
Attribute attribute = pi.GetCustomAttribute(typeof(PropertyNameAttribute));
if (attribute != null)
{
name = ((PropertyNameAttribute)attribute).ColumnName;
}
//自增主键只允许有一个,如果想多个主键,请实现表达式树写法
if (String.IsNullOrEmpty(value.PkColumnName))
{
Attribute pk = pi.GetCustomAttribute(typeof(PrimaryKeyAttribute));
if (pk != null)
{
value.PkColumnName = pi.Name;
}
}
EntityPropertyValue propertyValue = new EntityPropertyValue()
{
ColumnName = name,
IsIncrease = false
};
Attribute isincrease = pi.GetCustomAttribute(typeof(DefaultKeyAttribute));
if (isincrease != null)
{
propertyValue.IsIncrease = true;
value.DefaultColumn.Add(name);
}
valuePairs.Add(pi.Name, propertyValue);
}
value.ColoumNamePairs = valuePairs;
ValuePairs.Add(t, value);
}
}
}
