datatable

问题 Using JSF 2.1 with primefaces class FOO{ String name; String value; public void setName(String name){ this.name=name; } public String getName(){ return this.name; } public void setValue(String value){ this.value=value; } public String getValue(){ return this.value; } } I have an Map<String, List<FOO>> Header name should be Key of the Map. I need to create multiple columns (i.e. size of Map) and each column should have the list of FOO to display FOO.Name in rows. For Example : if size of map

问题 Using JSF 2.1 with primefaces class FOO{ String name; String value; public void setName(String name){ this.name=name; } public String getName(){ return this.name; } public void setValue(String value){ this.value=value; } public String getValue(){ return this.value; } } I have an Map<String, List<FOO>> Header name should be Key of the Map. I need to create multiple columns (i.e. size of Map) and each column should have the list of FOO to display FOO.Name in rows. For Example : if size of map

问题 I am working on a jQuery Datatable project where I need to filter the data based on specific row classes. I'm adding classes to my rows upon row creation based on a condition. I'm trying to figure out a way for my user to click a button which would apply a filter that only displays rows that contain a specific class. I've tried a few different solutions but I can't seem to make it work. Does anyone know how to do this correctly? Here is the JSFiddle $('#table').DataTable({ data: data, columns

问题 I am working in c# .net 2 (Visual Studio 2005 SP1) attempting to fill a dataset with the results from a select * from table from an Oracle10g database. The .net framework, IDE and database cannot be changed at this client site. I'm connecting using the ODP.net provider the dll version is 2.102.2.20 When I run the fill command I get an Exception: Arithmetic operation resulted in an overflow Also if I attempt to view the offending column in the Visual Studio designer (Show Table Data) I get for

问题 foreach (DataRow row in myDataTable.Select()) foreach (DataRow row in myDataTable.AsEnumerable()) foreach (DataRow row in myDataTable.Rows) Any differences? 回答1: Rows isn't strongly typed - so there will be a cast on each iteration, and you can't use LINQ to objects on it easily. (I believe AsEnumerable() will have to cast on each iteration internally as well, but at least you can use it for other LINQ methods easily.) Select needs to build an array, so there's obviously a performance penalty

问题 foreach (DataRow row in myDataTable.Select()) foreach (DataRow row in myDataTable.AsEnumerable()) foreach (DataRow row in myDataTable.Rows) Any differences? 回答1: Rows isn't strongly typed - so there will be a cast on each iteration, and you can't use LINQ to objects on it easily. (I believe AsEnumerable() will have to cast on each iteration internally as well, but at least you can use it for other LINQ methods easily.) Select needs to build an array, so there's obviously a performance penalty

问题 foreach (DataRow row in myDataTable.Select()) foreach (DataRow row in myDataTable.AsEnumerable()) foreach (DataRow row in myDataTable.Rows) Any differences? 回答1: Rows isn't strongly typed - so there will be a cast on each iteration, and you can't use LINQ to objects on it easily. (I believe AsEnumerable() will have to cast on each iteration internally as well, but at least you can use it for other LINQ methods easily.) Select needs to build an array, so there's obviously a performance penalty

问题 What is the maximum number of columns allowed in an Oracle table, in the following versions? Oracle 8i Oracle 9i Oracle 10g Oracle 11g Oracle 12c 回答1: A limit of 1,000 columns per table applies for versions 8i, 9i, 10g, 11g, 12c, 18c and 19c. Prior to that, Oracle 7 had a 254 column limit. 回答2: for Oracle 11g : 1000 Columns per table 32 columns per index Logical Database Limits: https://docs.oracle.com/cd/B28359_01/server.111/b28320/limits003.htm#i288032 回答3: For version 11g,10g,9i and 8i

问题 I'm trying to add items to a combo box using a data table that already has some columns but I just want one of them values into the combo box. What i'm doing is this: cbReviewers.DataSource = Reviewers_table.Columns[1]; but is not working, do you know how could I do it? 回答1: I think you need to use Display and Value members properties to work with display data. cbReviewers.DataSource = Reviewers_table cbReviewers.DisplayMember = "ColumnNameThatContainsText" cbReviewers.ValueMember =

问题 I have read several posts on this online, but none of them have resolved my issue. Most of the questions posted online point me towards checking Dbnull values from the database and I am doing that in the code. Here's the code where the exception is thrown: int rowNum = Convert.ToInt32(dataTable.Rows[r][dataTable.Columns.Count - 2]); Here's the code where I am checking for the dbnull values: for (int r = 0; r < dataTable.Rows.Count - 1; r++) //rows { for (int c = 1; c < dataTable.Columns.Count