Question

我知道我可以使用SMO找到Table Rowcount，但是我无法获得View Rowcount ..我真的不需要精确的rowcount（这是奖金），但我确实需要知道该视图是＆＃34;空＆＃34; （0条记录）。

到目前为止，这是我的尝试：

 public Int64 GetRowCount()
{
    SqlConnection sqlConnection = new SqlConnection(SqlConnectionString);
    ServerConnection serverConnection = new ServerConnection(sqlConnection);
    Server server = new Server(serverConnection);
    if (server == null)
        throw new InvalidDataException(
            string.Format(
                "Could not connect to server {0}. Check that it exists and that the current user has access to it.",
                SqlServerName));
    Database db = server.Databases[SqlDatabaseName];
    if (db == null)
        throw new InvalidDataException(
            string.Format(
                "Could not connect to database {0} on server {1}. Check that it exists and that the current user has access to it.",
                SqlDatabaseName, SqlServerName));

    db.DefaultSchema = SqlSchemaName;

    if (db.Tables.Contains(SqlTableName))
    {
        Table tbl = db.Tables[SqlTableName];
        return tbl.RowCount;
    }
    if (db.Views.Contains(SqlTableName))
    {
        View view = db.Views[SqlTableName];
        try
        {
            view.ReCompileReferences();
        }
        catch
        {
            // ignored
        }
        return view.RowCount;  ************************** MAGIC GOES HERE
    }

    throw new InvalidDataException(string.Format(    "The SQL table/view {0} does not exist in database {1}, or is not accessible by the current user.",
SqlTableName, SqlDatabaseName));
}

Answer 1

如果找不到其他方法，可以始终使用ExecuteWithResults方法选择单行和单个字段。然后，您可以检查结果以查看它是否返回任何行。

 var server = new Server();
 var db = server.Databases("northwind");
 var results = db.ExecuteWithResults("select top 1 ID from [ViewName]");

Answer 2

只需使用Ado.Net连接执行命令：

        var cmd = sqlConnection.CreateCommand();

        cmd.CommandText = string.Format(@"if exists(select * from {0})
                          select 1 as exist
                          else 
                          select 0 as exist", SqlTableName);

        var result = (int)cmd.ExecuteScalar();

如果结果== 1则存在一些记录

Answer 3

我认为答案是＆＃34;没有＆＃34;除非视图是索引（或物化）视图。我这样说是因为SMO似乎在查看sys.partitions中的元数据以确定行数，除非视图下面的数据持久存储到磁盘，否则不会存在任何行。只有在对视图编制索引时才会发生这种情况。

使用Sql Management Objects（SMO）连接到SQL，如何查看视图是否有任何行？

3 个答案: