Question

我正在尝试创建一个从元数据创建模型的简单工具。我成功创建了表和列，但无法在模型下创建关系。在尝试将FromTable和ToTable属性添加到关系对象时，我收到一条错误消息，指出这些属性是只读的，无法更改。

以下是我用来创建关系的示例代码。

public void AddRelationshipsToModel()
    {
        OleDbDataReader reader = null;
        try
        {
            OleDbConnection connection = new OleDbConnection();
            connection.ConnectionString = metadataConnInfo.ConnectionString;
            connection.Open();
            OleDbCommand command = connection.CreateCommand();
            command.CommandText = "select source_parent_table_name,source_parent_column_name, source_child_table_name,source_child_column_name from HX_VIEWS_RMS.BI_TABULAR_RELATIONSHIPS where MODEL_NAME='"+database.Model.Name +"'";
            reader = command.ExecuteReader();
            while(reader.Read())
            {
                string _toTable =  srcAndTabularTableMap[reader.GetValue(0).ToString().Trim()];
                string _toColumn = srcTableAndTabularColMap[reader.GetValue(0).ToString().Trim()][ reader.GetValue(1).ToString().Trim()];
                string _fromTable = srcAndTabularTableMap[reader.GetValue(2).ToString().Trim()];
                string _fromColumn = srcTableAndTabularColMap[reader.GetValue(2).ToString().Trim()][reader.GetValue(3).ToString().Trim()];

                Table fromTable = Database.Model.Tables[_fromTable];
                DataColumn fromColumn = (DataColumn)fromTable.Columns[_fromColumn];
                Table toTable = Database.Model.Tables[_toTable];
                DataColumn toColumn = (DataColumn)fromTable.Columns[_toColumn];

                SingleColumnRelationship relationship = new SingleColumnRelationship();

                relationship.FromTable = fromTable;
                relationship.FromColumn = fromColumn;
                relationship.ToTable = toTable;
                relationship.ToColumn = toColumn;

                //database.Model.Relationships.Add(new SingleColumnRelationship() { FromColumn = fromColumn ,ToColumn =toColumn});
            }
            connection.Close();
        }
        catch(Exception ex)
        {
            logger.Error(ex.Message);
        }
    }

Answer 1

这个blog post是一个很好的演练。

尝试仅设置FromColumn和ToColumn属性而不是FromTable和ToTable设置。您可以选择将它们设置为构造函数的一部分：

SingleColumnRelationship relationship = new SingleColumnRelationship()
{
                FromColumn = fromColumn,
                ToColumn = toColumn
};

Answer 2

表格对象模型API具有相当多的只读字段/属性。基本上他们试图告诉你，你不是想直接编辑这些字段，而是让API为你填充它们。

典型的关系看起来像这样

                Server = new Microsoft.AnalysisServices.Tabular.Server();
                [...]
                Server.Databases["MyDatabaseName"].Model.Relationships.Add(new SingleColumnRelationship
                {
                    Name = "Relationship name",
                    FromColumn = Server.Databases["MyDatabaseName"].Model.Tables["FromTableName"].Columns["FromColumnName"],
                    FromCardinality = RelationshipEndCardinality.Many,
                    ToColumn = Server.Databases["MyDatabaseName"].Model.Tables["ToTableName"].Columns["ToColumnName"],
                    ToCardinality = RelationshipEndCardinality.One,
                    CrossFilteringBehavior = CrossFilteringBehavior.BothDirections,
                    IsActive = false
                });

Answer 3

尝试使用此类 - Microsoft.AnalysisServices.Tabular.SingleColumnRelationship

无法使用表格模型编程在SSAS 2016中创建关系，以实现兼容性级别1200

3 个答案: