public PopulateToken(Metadata.IEntityMetadata entity, EntityMember member, int ordinal)
{
this.Ordinal = ordinal;
this.Entity = entity;
this.Member = member;
this.Tokens = null;
this.Keys = null;
}
internal Schema(SchemaParser parser, string text, Metadata.IEntityMetadata entity, Type entityType, Collections.INamedCollection <SchemaMember> entries)
{
_parser = parser ?? throw new ArgumentNullException(nameof(parser));
this.Text = text ?? throw new ArgumentNullException(nameof(text));
this.Entity = entity ?? throw new ArgumentNullException(nameof(entity));
this.EntityType = entityType;
_members = entries ?? new Collections.NamedCollection <SchemaMember>(entry => entry.Name, StringComparer.OrdinalIgnoreCase);
}
public IDataPopulator GetPopulator(Metadata.IEntityMetadata entity, Type type, IDataReader reader)
{
var keys = new string[reader.FieldCount];
for (int i = 0; i < reader.FieldCount; i++)
{
//获取字段名对应的属性名（注意：由查询引擎确保返回的记录列名就是属性名）
keys[i] = reader.GetName(i);
}
return(new DictionaryPopulator(type, keys));
}
public PopulateToken(Metadata.IEntityMetadata entity, EntityMember member)
{
this.Ordinal = -1;
this.Entity = entity;
this.Member = member;
this.Tokens = new List <PopulateToken>();
this.Keys = new int[entity.Key.Length];
for (int i = 0; i < this.Keys.Length; i++)
{
this.Keys[i] = -1;
}
}
public IDataPopulator GetPopulator(Metadata.IEntityMetadata entity, Type type, IDataReader reader)
{
//获取指定类型对应的装配器
var populator = this.GetPopulator(type);
if (populator == null)
{
//如果是可空类型，则获取可空类型的定义元类型
if (type.IsValueType && type.IsGenericType && type.GetGenericTypeDefinition() == typeof(Nullable <>))
{
populator = this.GetPopulator(type.GetGenericArguments()[0]);
}
}
return(populator);
}
public UpdateStatement(Metadata.IEntityMetadata entity) : base(entity)
{
this.Fields = new List <FieldValue>();
this.Tables = new List <TableIdentifier>();
this.Tables.Add(this.Table);
}
