public Reader()
{
tableMeta = TableMeta.From <T>();
}
public static Func <Dictionary <string, object>, object> GetObjectMapper(TableMeta tableMeta)
{
return(objectMappers.Get(tableMeta.Type, () =>
{
var constructor = tableMeta.Type.GetDefaultConstructor()
?? tableMeta.Type.GetConstructors().FirstOrDefault();
if (constructor == null)
{
throw Error.Exception("类型" + tableMeta.Type + "没有公开的构造函数。");
}
var parameter = constructor.GetParameters();
Func <Dictionary <string, object>, object> map = (param) =>
{
var columns = tableMeta.Columns.ToList();
var args = new List <object>();
foreach (var info in parameter)
{
var t = info.ParameterType;
var n = info.Name;
var col = columns.FirstOrDefault(x => x.Name.IsSameField(n));
var val = t.GetDefaultValue();
if (col != null)
{
var key = col.ColumnName;
if (param.ContainsKey(key))
{
val = param[key];
if (val != null && !t.IsInstanceOfType(val))
{
var mapper = GetMapper(t, val.GetType());
val = mapper(val);
}
param.Remove(key);
}
columns.Remove(col);
}
else if (!DbTypes.IsSimpleType(t))
{
var vs = param.Where(x => x.Key.StartsWith(n + "-"))
.ToDictionary(x => x.Key.Substring(n.Length + 1), x => x.Value);
var pMeta = TableMeta.From(t);
var mapper = GetObjectMapper(pMeta);
val = mapper(vs);
foreach (var vsKey in vs.Keys)
{
param.Remove(n + "-" + vsKey);
}
}
args.Add(val);
}
var instance = constructor.FastCreate(args.ToArray());
foreach (var col in columns.Where(x => x.CanWrite))
{
var key = col.ColumnName;
if (param.ContainsKey(key))
{
var val = param[key];
if (val != null && !col.Type.IsInstanceOfType(val))
{
var mapper = GetMapper(col.Type, val.GetType());
val = mapper(val);
}
col.SetValue(instance, val);
param.Remove(key);
}
}
var keys = param.Where(x => x.Key.Contains("-")).ToList();
if (keys.Any())
{
var inners = keys.GroupBy(x => x.Key.Split('-')[0]);
foreach (var inner in inners)
{
var prop = tableMeta.Type.GetProperty(inner.Key);
if (prop != null && prop.CanWrite)
{
var vs = inner.ToDictionary(x => x.Key.Substring(inner.Key.Length + 1), x => x.Value);
var propMeta = TableMeta.From(prop.PropertyType);
var mapper = GetObjectMapper(propMeta);
var propValue = mapper(vs);
prop.FastSetValue(instance, propValue);
}
foreach (var result in inner.Select(x => x.Key))
{
param.Remove(result);
}
}
}
return instance;
};
return map;
}));
}