rowcount

Row count of a column family in Cassandra

由 时光怂恿深爱的人放手 提交于 2019-11-28 18:09:07
Is there a way to get a row count (key count) of a single column family in Cassandra? get_count can only be used to get the column count. For instance, if I have a column family containing users and wanted to get the number of users. How could I do it? Each user is it's own row. If you are working on a large data set and are okay with a pretty good approximation, I highly recommend using the command: nodetool --host <hostname> cfstats This will dump out a list for each column family looking like this: Column Family: widgets SSTable count: 11 Space used (live): 4295810363 Space used (total):

Datagridview rowcount showing 0 even when there is a valid datasource

由 ∥☆過路亽．° 提交于 2019-11-28 10:07:18
问题 I have a dynamically created DataGridView that has a valid DataSource with one row bound to it. However, it is returning me 0 when I am doing a rowcount on the DataGridView. dgResult.DataSource = resultDt; // a datatable containing one row flowLayoutPanel.Controls.Add(dgResult); int rows = dgResult.Rows.Count; // returning 0 always! Can someone please tell me where I may be going wrong here? 回答1: I found the issue. I was displaying the grid in a tabbed page that was not selected. Unless the

ToRowCountQuery seems to ignore groupings

由 ↘锁芯ラ 提交于 2019-11-28 02:04:04
I'm trying to create a rowcount-query from a regular query, but the resulting SQL seems to lack the GROUP BY resulting in a wrong count. Does anyone know what I'm doing wrong. First the queries: var query = Session.QueryOver<InkoopFactuurListItem>() .Where(i => i.KlantId == Klant.Id) .AndRestrictionOn(i => i.Status).IsIn(statussen) .SelectList(list => list .SelectGroup(h => h.Id).WithAlias(() => dto.Id) .SelectGroup(h => h.Banknummer).WithAlias(() => dto.Banknummer) .SelectGroup(h => h.CrediteurNaam).WithAlias(() => dto.CrediteurNaam) .SelectGroup(h => h.DienstType).WithAlias(() => dto

Return number of rows affected by SQL UPDATE statement in Java

由 我与影子孤独终老i 提交于 2019-11-27 22:58:11
问题 I'm using a MySQL database and accessing it through Java. PreparedStatement prep1 = this.connection.prepareStatement("UPDATE user_table SET Level = 'Super' WHERE Username = ?"); prep1.setString(1, username); The update statement above works fine however I'd like to get the number of rows affected with this statement. Is this possible please? 回答1: Calling executeUpdate() on your PreparedStatement should return an int, the number of updated records. 回答2: Statement.executeUpdate() or execute()

SQL Server - does trigger affects @@Rowcount?

由 半腔热情 提交于 2019-11-27 17:34:05
问题 I have a query which do UPSERT or update if exists and insert if not: update MyTable set [Name]=@NewValue where ID=@ID If @@RowCount = 0 insert into MyTable([Name]) values(@Name) Now, I wonder if the @@RowCount will be affected by a query executed in a trigger? Let us say in my trigger I have: insert into MyLogs(Description) values("Some description...") If the update is successful in my first query, the trigger will run the insert to MyLogs which will have affected rows. 回答1: @@ROWCOUNT is

How to show all rows in the jqGrid?

由 孤街醉人 提交于 2019-11-27 12:17:33
jqGrid exposes a property rowNum where you can set the number of rows to display for each page. How do you set the grid to just display ALL rows? Right now I'm just setting the rowNum to something really high like <%= int.MaxValue %> but I'm wondering if there is a better way. In the latest version of jqGrid, you can set rowNum to -1 to instruct the grid to always display all rows: rowNum: -1 See the latest jqGrid documentation here . Specifically: Sets how many records we want to view in the grid. This parameter is passed to the url for use by the server routine retrieving the data. Note that

Suppress Crystal Reports section if there are no rows in a datatable

由 限于喜欢 提交于 2019-11-27 06:25:20
问题 I have a section in a Crystal Report that I want to suppress. I need to suppress it if there are 0 rows in a particular table in the dataset I am using. How would I do this? The Record Number special field provided appears to be an internal count of records in the report, and does not relate to the rows in the underlying data table. I am creating the report from C#, but I cannot suppress the section from the code (it doesn't fit the project structure) - I must be able to do it from the report

ToRowCountQuery seems to ignore groupings

由 梦想与她 提交于 2019-11-26 23:37:27
问题 I'm trying to create a rowcount-query from a regular query, but the resulting SQL seems to lack the GROUP BY resulting in a wrong count. Does anyone know what I'm doing wrong. First the queries: var query = Session.QueryOver<InkoopFactuurListItem>() .Where(i => i.KlantId == Klant.Id) .AndRestrictionOn(i => i.Status).IsIn(statussen) .SelectList(list => list .SelectGroup(h => h.Id).WithAlias(() => dto.Id) .SelectGroup(h => h.Banknummer).WithAlias(() => dto.Banknummer) .SelectGroup(h => h

How to fetch the row count for all tables in a SQL SERVER database [duplicate]

由 心不动则不痛 提交于 2019-11-26 18:03:32
This question already has an answer here: Query to list number of records in each table in a database 19 answers I am searching for a SQL Script that can be used to determine if there is any data (i.e. row count) in any of the tables of a given database. The idea is to re-incarnate the database in case there are any rows existing (in any of the database). The database being spoken of is Microsoft SQL SERVER . Could someone suggest a sample script? adrianbanks The following SQL will get you the row count of all tables in a database: CREATE TABLE #counts ( table_name varchar(255), row_count int

How to show all rows in the jqGrid?

由 柔情痞子 提交于 2019-11-26 15:57:50
问题 jqGrid exposes a property rowNum where you can set the number of rows to display for each page. How do you set the grid to just display ALL rows? Right now I'm just setting the rowNum to something really high like <%= int.MaxValue %> but I'm wondering if there is a better way. 回答1: In the latest version of jqGrid, you can set rowNum to -1 to instruct the grid to always display all rows: rowNum: -1 See the latest jqGrid documentation here. Specifically: Sets how many records we want to view in
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