I'm fooling around with WebMatrix, and so far the best way I've figured out how to use stored procedures with Razor/WebMatrix is like so-
#if (IsPost) {
var LinkName = Request["LinkName"];
var LinkURL = Request["LinkURL"];
string sQ = String.Format("execute dbo.myprocname #LinkName=\"{0}\",
#LinkURL=\"{1}",LinkName, LinkURL);
db.Execute(sQ);
}
Note, I'm not doing any sort of checking for SQL injections or anything like that, which I think would be uber necessary. Am I missing something?
The Execute method accepts parameters.
#if (IsPost) {
var LinkName = Request["LinkName"];
var LinkURL = Request["LinkURL"];
string SQL = "exec dbo.myprocname #0, #1";
db.Execute(SQL, LinkName, LinkURL);
}
Update: I've updated my answer so that the parameters for the sproc are given placeholders that are numbered rather than named.
well, this is what I found is easiest and you can use named parameters. Meaning, if your stored procedure has several optional parameters, you can only pass the ones you need or want to pass.
#{
var db = Database.Open("your database name");
var param1 = "informationhere";
var param2 = "informationhere";
// or var param2 = 15247 (no quotes necessary if param is an integer datatype)
var procRows = db.Query("Exec dbo.procName #RealParameterName1=#0, #RealParameterName2=#1", param1, param2);
}
<table>
#foreach( var procRow in procRows )
{
<tr>
<td>#procRow.ColumnName1</td>
<td>#procRow.ColumnName2</td>
<td>#procRow.ColumnName3</td>
//etc
</tr>
}
</table>
Related
I’m trying to get the variable name instead of the value to pass it to another method
eg.
String myString = "xyz";
String getVariableName(String s){
// What i want is if the above string is passed [getVariableName(myString)]
//i want it to return ['myString']
}
This is generally not possible. At best, if there are a finite number of String variables you care about, you could manually make a collection of them, and then search it:
final stringVariables = <String, String Function()>{
'myString': () => myString,
'myOtherString': () => myOtherString,
};
var myString = 'xyz';
var myOtherString = 'abc';
String getVariableName(String s) {
for (var entry in stringVariables.entries) {
if (entry.value() == s) {
return entry.key;
}
}
return '';
}
void main() {
print(getVariableName('xyz')); // Prints: myString
myString = 'foo';
print(getVariableName('foo')); // Prints: myString
}
Note that stringVariables's above must use a Function as a thunk to delay evaluation of the variable; otherwise the variable name would be associated with whatever value it happened to have when stringVariables is first accessed and wouldn't work if your variables are reassigned.
All that said, I don't really recommend doing any of this. This sounds like an XY problem. You should be asking about whatever it is you ultimately want to do, and there probably is a better way to accomplish that task.
I'm using Entity Framework 6 with ASP.Net MVC 5. When using a database context object, is there a way to use a variable for the table name, without having to manually write the query?
For example:
var tableName = "NameOfTable";
result = context.tableName.Find(...);
I know that particular code won't work, because tableName is not defined in context, but is there a way to achieve the desired effect?
There are some similar questions on this site, but they never really solved the problem and they were for earlier versions of entity framework, so I'm hoping that there is an answer now.
Here's a simple solution using a switch to associate a particular Type to a table. You could also maintain use some sort of Dictionary<string, Type> object.
var tableName = "Table1";
// Get proper return type.
Type returnType;
switch(tableName) {
case "Table1":
returnType = typeof(Table1EntityType);
break;
case "Table2":
returnType = typeof(Table2EntityType);
break;
}
var query = context.Set(returnType);
// Filter against "query" variable below...
var result = query.Where(...);
-or-
var tableName = "Table1";
Dictionary<string, Type> tableTypeDict = new Dictionary<string, Type>()
{
{ "Table1", Table1Type },
{ "Table2", Table2Type }
};
var query = context.Set(tableTypeDict[tableName]);
// Filter against "query" variable below...
var result = query.Where(...);
EDIT: Modified for Entity Framework
EDIT2: Use typeof per #thepirat000 's suggestion
In addition to the helpful answers above, I also want to add this in case it helps someone else.
If you are getting this error on the "Where" clause in Mark's answer:
'DbSet does not contain a definition for 'Where' and no acceptable extension method 'Where' accepting an argument of the type 'DbSet' could be found.
Installing the Nuget Package "System.Linq.Dynamic.Core" made the error disappear for us.
If you need to access the LINQ methods and the column names from the table, you can code something like this:
var tableName = "MyTableName";
var tableClassNameSpace = "MyProject.Models.EntityModels";
using (var dbContext = new MyEntities())
{
var tableClassName = $"{tableClassNameSpace}.{tableName}";
var dynamicTableType = Type.GetType(tableClassName); // Type
var dynamicTable = dbContext.Set(dynamicTableType); // DbSet
var records = dynamicTable
.AsQueryable()
.ToDynamicList()
.OrderBy(d => d.MyColumnName)
.Select(d => new { d.MyColumnName })
.ToList();
// do stuff
}
I want fetch the details of a Collection in Odata services like the following URL
http://my.company.com/odata/Employee('1234')/Details
I tried with the following code to do so. Not sure whether fromEntityKey is the right thing to do or anything else.
manager = new breeze.EntityManager(collectionData.serviceName);
var empType = manager.metadataStore.getEntityType("Employees");
var entityKey = new EntityKey(empType, '1234');
var query = EntityQuery.fromEntityKey(entityKey);
But it gives me an error "Be sure to execute a query or call fetchMetadata first."
I also tried that from this link. But I'm still getting the same.
Can any one help me on this?
You can't use manager.metadataSote.getEntityType("Employees") until metadata has been retrieved from the server. By default this occurs during the first query operation, but your code is attempting to use the metadata before it has been retrieved.
Also, I think that you are confusing the name of your resource "Employees" with the type of the instances returned by your resource, probably "Employee". I would also check whether your key's datatype is numeric or a string. The example below assume its numeric (unlike your example where the datatype of the key is presumably a string because you are quoting it).
So you have two approaches, either force the metadata to be fetched before you compose your query, like this:
manager = new breeze.EntityManager(serviceName);
manager.fetchMetadata().then(function () {
var empType = manager.metadataStore.getEntityType("Employee");
var entityKey = new EntityKey(empType, 1);
var query = EntityQuery.fromEntityKey(entityKey);
// if you want to also see the queries details
query = query.expand("Details");
return manager.executeQuery(query);
}).then(function (data) {
var results = data.results;
ok(results.length === 1, "should have returned a single record");
var emp = results[0];
));
or if you know the string name of the 'key' ("Id" in the example below) field, use it directly
manager = new breeze.EntityManager(serviceName);
var query = EntityQuery.from("Employees")
.where("Id", "==", 1)
.expand("Details");
manager.executeQuery(query).then(function(data) {
var results = data.results;
var emp = results[0];
});
I am trying to setup a search in umbraco examine.I have two search fields ,material and manufacturer.when I trying to search with one material and one manufactuere it will give the correct result.but when try to search more than one material or manufacturer it doesn't give the result.here is my code
const string materialSearchFields = "material";
const string manufacturerSearchFields = "manufacturer";
if (!string.IsNullOrEmpty(Request.QueryString["material"]))
{
material = Helper.StripTags(Request.QueryString["material"]);
}
if (!string.IsNullOrEmpty(Request.QueryString["manufacturer"]))
{
manufacturer = Helper.StripTags(Request.QueryString["manufacturer"]);
}
if (!string.IsNullOrEmpty(Request.QueryString["material"]) || !string.IsNullOrEmpty(Request.QueryString["manufacturer"]))
{
var query = userFieldSearchCriteria.Field(materialSearchFields, material).And().Field(manufacturerSearchFields, manufacturer).Compile();
contentResults = contentSearcher.Search(query).ToList();
}
here my search keywors in querystring is material=iron,steel
how can we split this keyword and search done?
Thanks in advance for the help....
You are using the AND operator, in your case I think you are looking for the GROUPEDOR instead?
I was just working in an old project and grabbed this snipet from there (which I've adapted for your needs). I think it's going to help you:
public IEnumerable<DynamicNode> SearchUmbraco(string[] keywords, string currentCulture)
{
// In this case I had some diferent cultures, so this sets the BaseSearchProvider to the given culture parameter. You might not need this, use your default one.
BaseSearchProvider searcher = SetBaseSearchProvider(currentCulture);
var searchCriteria = searcher.CreateSearchCriteria(BooleanOperation.Or);
var groupedQuery = searchCriteria.GroupedOr(new[] {"manufacturer", "material"}, keywords).Compile();
var searchResults = searcher.Search(groupedQuery);
// ... return IEnumerable of dynamic nodes (in this snipet case)
}
I just split(etc) the keywords in an helper and pass them to a string array when I call this method.
Just check this infomation on the umbraco blog: http://umbraco.com/follow-us/blog-archive/2011/9/16/examining-examine.aspx
What is the best practice in Dart when dealing with classes as data records?
To Elaborate: When writing an app, it is likely that a class for a table row will be created. As in
class Item { int itemid, String itemName, double score }
Item item = new Item();
This allows compile time catching of any typos etc. in Dart. (Unlike using a class that relies on NoSuchMethod.)
It will also need a corresponding string structure to bind to the HTML such as
<input id="itemname" type="text" bind-value="itemEdit.itemName">
So the Dart would be:
class ItemEdit { String itemId, String itemName, String score }
ItemEdit itemEdit = new ItemEdit();
Next we need a way to get from one to the other, so we add a method to Item
fromStrings(ItemEdit ie) {
itemid = ie.itemId == null ? null : int.parse(ie.itemId);
itemName = ie.ItemName;
score = ie.score == null ? null : double.parse(ie.score);
}
And the other way around:
toStrings(ItemEdit ie) {
ie.itemid = itemId == null ? '' : ie.itemId.toString();
ie. itemName = itemName == null ? '' : itemname; // Web_ui objects to nulls
ie.score = score == null ? null : score.toStringAsFixed(2);
}
Also, we get jason data from a database, so we need to add another method to Item:
fromJson(final String j) {
Map v = JSON.parse(j);
itemid = v['itemid'];
itemname = v['itemname'];
score = v['score'];
}
And we need to be able to revert to default values:
setDefaults() { itemId = 0; itemName = "New item"; score = 0; }
This verbosity gets me feeling like I am writing COBOL again!
There is something fundamental missing here - either in my understanding, or in the Dart/WebUI libraries.
What I would like to write is something like
class Item extends DataRecord {
int itemid = 0,
String itemName = 'New item',
double score = 0.0;
}
Then, without further coding, to be able to write code such as
item.toStrings();
...
item.fromStrings();
...
item.fromJson(json);
...
item.setDefaults(); // results in {0,'New item',0.0}
And to be able to write in the HTML:
value="{{item.strings.score}}"
If this was possible, it would be quicker, simpler, clearer, and less error prone than the code I am writing at the moment.
(Full disclosure, this answer is written with the assumption that at least one bug will be fixed. See below)
Three suggestions that might help.
Use named constructors to parse and create objects.
Take advantage of toJson() when encoding to JSON.
Use bind-value-as-number from Web UI
1) Named constructors
import 'dart:json' as json;
class Item {
int itemid;
String itemName;
double score;
Item.fromJson(String json) {
Map data = json.parse(json);
itemid = data['itemid'];
itemName = data['itemName'];
score = data['score'];
}
}
2) Encoding to JSON
The dart:json library has a stringify function to turn an object into a JSON string. If the algorithm encounters an object that is not a string, null, number, boolean, or collection of those, it will call toJson() on that object and expect something that is JSON-encodable.
class Item {
int itemid;
String itemName;
double score;
Map toJson() {
return {'itemid':itemid, 'itemName':itemName, 'score':score};
}
}
3) Now, having said that, sounds like you want to easily bind to HTML fields and get primitive values back, not just strings. Try this:
<input type="number" min="1" bind-value-as-number="myInt" />
(Note, there seems to be a bug with this functionality. See https://github.com/dart-lang/web-ui/issues/317)
(from https://groups.google.com/a/dartlang.org/forum/#!topic/web-ui/8JEAA5OxJOc)
Just found a way to perhaps help a little in the this situation:
class obj {
int gapX;
String get gapXStr => gapX.toString();
set gapXStr(String s) => gapX = int.Parse(s);
...
Now, from the HTML you can use, for example
bind-value="gapXStr"
and in code you can use
x += ob.gapX;