dataset

问题 I have a data set: DataSet ds= _ExecuteQuery(contentCmd, CommandType.Text, contentParams); // Column name foreach (DataColumn column in ds.Tables[0].Columns) { Console.WriteLine(column.ColumnName); } // Rows value foreach (DataTable dt in ds.Tables){ foreach (DataRow dr in dt.Rows){ Console.Writeline(dr.Table.Rows[0]["name"].ToString()); } } How can I retrieve rows value and column name of the row? List<columnName, name>; 回答1: I assume that you're looking for something like this: Dictionary

问题 I am trying to come up with reproducible example (RE) for this question: Errors related to data frame columns during merging. To be qualified as having a RE, the question lacks only reproducible data . However, when I tried to use pretty much standard approach of dput(head(myDataObj)) , the output produced is 14MB size file. The problem is that my data object is a list of data frames , so head() limitation doesn't appear to work recursively . I haven't found any options for dput() and head()

问题 I need to insert multiple rows in my Mysql database.my rows are available in my dataset. i am using for loop to send the row one by one is that right way?... 回答1: You can insert multiple rows using a single SQL statement like so: INSERT INTO myTable (col1, col2, col3) VALUES ('myval1', 'myval2', 'myval3'), ('myotherval1', 'myotherval2', 'myotherval3'), ('anotherval1', 'anotherval2', 'anotherval3'); Update: MarkR is right in his comment - if you're collecting data from a user, or you're

问题 I need to insert multiple rows in my Mysql database.my rows are available in my dataset. i am using for loop to send the row one by one is that right way?... 回答1: You can insert multiple rows using a single SQL statement like so: INSERT INTO myTable (col1, col2, col3) VALUES ('myval1', 'myval2', 'myval3'), ('myotherval1', 'myotherval2', 'myotherval3'), ('anotherval1', 'anotherval2', 'anotherval3'); Update: MarkR is right in his comment - if you're collecting data from a user, or you're

问题 The Spark API Doc's show how to get a pretty-print snippit from a dataset or dataframe sent to stdout. Can this output be directed to a log4j logger? Alternately: can someone share code which will create output formatted similarly to the df.show()? Is there a way to do this which allow stdout to go to the console both before and after pushing the .show() output to the logger? http://spark.apache.org/docs/latest/sql-programming-guide.htm val df = spark.read.json("examples/src/main/resources

问题 I am new to machine learning and am creating a dataset using pandas in Python. I looked up a tutorial and was just trying out a basic code for creating a dataframe, but I keep getting the following trace-back: AttributeError: 'module' object has no attribute 'read_csv' I have saved the csv file in the csv(comma delimited) formatfrom Excel 13. Here's my code: import pandas import csv mydata = pandas.read_csv('foo.csv') target = mydata["Label"] data = mydata.ix[:,:-1] 回答1: There was a file

问题 I currently have a DataGridView on a form which I want to use with a DataTable in a DataSet, populated from a SQlite database (using System.Data.SQlite). So, I have a DataAdapter between the database and DataSet and can set the DataGridView data source directly as the DataTable. This displays fine. My question is this: Why would I want to use a Binding Source here? Many tutorials have said you can use it or not. But is there any use for it, other than adding an extra step? Also, if I want the

问题 I use a DataGrid to show a xml file. The Grid's DataSource is a Typed DataSet.(using schema) Assembly assembly = Assembly.GetExecutingAssembly(); Stream stream = assembly.GetManifestResourceStream("XML_Reader.Resources.schema.xsd"); XmlSchemaSet schemas = new XmlSchemaSet(); XmlReaderSettings settings = new XmlReaderSettings(); settings.ValidationType = ValidationType.Schema; settings.Schemas.Add(null, XmlReader.Create(stream)); using (XmlReader reader = XmlReader.Create(xmlFile, settings)) {

问题 At work we have a component called a "ClientdatasetGrid", which allows the user to sort the records of the grid by clicking on one or multiple column-titles. I have made a component for work also, a descendant from TEdit, which I call TDBFilterEdit. once you assign a DataSet or DBGrid to it, it creates an OnFilterRecord event for the DataSet and after you stop changing the text that Event is executed. the problem arises whenever the Dataset is already filtered and the user sorts the grid. the

问题 I would like to group the rows of this dataset by MemberID. This is a snipet of my dataset "Claims": MemberID SopLos DIH 1 54 0 1 2 55 1 2 3 56 2 3 4 67 0 5 5 55 1 1 6 54 0 1 7 55 1 2 8 56 2 3 9 67 0 5 10 55 1 1 My desired data frame: MemberID SopLos DIH 1 54 0 1 2 54 0 1 3 55 1 1 4 55 1 2 5 55 1 1 6 55 1 2 7 56 2 3 8 56 2 3 9 67 0 5 10 67 0 5 Then I would like to sum the rows by common ID's resulting in the following data frame MemberID SopLos DIH 1 54 0 2 2 55 4 6 3 56 4 6 4 67 0 10 If you