In my ASP.NET MVC application i've been trying to select the data from the table from users that are ACTIVE, which is on a column from the database as true or false, however when i try to do this code, it doesn't show any data:
com.CommandText = "SELECT [NumMec], [NomeCompleto] FROM [CORE_USERS] WHERE [Activo] like 'T%'";
I've tried a different approach, which was controlling the select by doing a (Data.Activo == "True") in the View. But I don't want this approach, I want to control the data from the database:
#{
if (Model != null)
{
foreach (var Data in Model)
{
if (Data.Activo == "True")
{
<tr>
<td>#Data.NumMec</td>
<td>#Data.Activo</td>
<td>#Data.NomeCompleto</td>
</tr>
}
}
}
}
if you are on sql server and datatype of Activo column is bit, then the correct syntax is :
SELECT [NumMec], [NomeCompleto] FROM [CORE_USERS] WHERE [Activo] = 1
bit = 1 means true
Related
I'm using asp core razor pages ,
and i'm trying to return data as json by controller
this is working fine for me :
return Json(new { data = _db.Clients.FromSqlRaw("select * from Clients where nom_createur != 'X'").ToList() });
But this
return Json(new { data = _db.Clients.FromSqlRaw("select nom_createur,COUNT(Id_Client) as 'counte' from clients where Nom_Createur != 'X' group by nom_createur").ToList() });
given this error :
The required column 'Id_Client' was not present in the results of a 'FromSql' operation
ps: i really need to use FromSqlRaw
My scenario is i have a grid with search option where user can select the column and can do the search, the grid data is coming from various tables. I have attached a sample screen of grid.
User Screen
So i'm trying to create a dynamic query for search but the problem is i can able to search only in main table (schema.Robot) not in Preload tables. whenever i trying to search data data from Preload tables let say from RobotModel table that time getting below error
pq: missing FROM-clause entry for table "robot_models"
Here is my go code
func (r *RobotsRepository) GetRobotsSummary(listParams viewmodel.ListParams, companyID uint) ([]*schema.Robot, int, error) {
mrobots := []*schema.Robot{}
var count int
var order string
if listParams.SortColumn == "" {
listParams.SortColumn = "id"
listParams.SortOrder = 1
} else {
listParams.SortColumn = util.Underscore(listParams.SortColumn)
}
if listParams.SortOrder == 0 {
order = "ASC"
} else {
order = "DESC"
}
var searchQuery string
if listParams.SearchText != "" {
switch listParams.SearchColumn {
case "Robot":
listParams.SearchColumn = "name"
case "Model":
listParams.SearchColumn = "robot_models.name"
}
searchQuery = listParams.SearchColumn +" LIKE '%"+ listParams.SearchText +"%' and Company_ID = " + fmt.Sprint(companyID)
}else{
searchQuery = "Company_ID = " + fmt.Sprint(companyID)
}
orderBy := fmt.Sprintf("%s %s", listParams.SortColumn, order)
err := r.Conn.
Preload("RobotModel", func(db *gorm.DB) *gorm.DB {
return db.Select("ID,Name")
}).
Preload("Task", func(db *gorm.DB) *gorm.DB {
return db.Where("Task_Status in ('In-Progress','Pending')").Select("ID, Task_Status")
}).
Preload("CreatedUser", func(db *gorm.DB) *gorm.DB {
return db.Select("ID,Display_Name")
}).
Preload("UpdatedUser", func(db *gorm.DB) *gorm.DB {
return db.Select("ID,Display_Name")
}).
Where(searchQuery).
Order(orderBy).
Offset(listParams.PageSize * (listParams.PageNo - 1)).
Limit(listParams.PageSize).
Find(&mrobots).Error
r.Conn.Model(&schema.Robot{}).Where(searchQuery).Count(&count)
return mrobots, count, err
}
In searchQuery variable i'm storing my dynamic query.
My question is how can i search data for preload table columns
Here is the sql query which i'm trying to achieve using gorm
SELECT robots.id,robots.name,robot_models.name as
model_name,count(tasks.task_status) as task_on_hand,
robots.updated_at,users.user_name as updated_by
FROM rfm.robots as robots
left join rfm.tasks as tasks on tasks.robot_id = robots.id and
tasks.task_status in ('In-Progress','Pending')
left join rfm.robot_models as robot_models on robot_models.id =
robots.robot_model_id
left join rfm.users as users on users.id = robots.updated_by
WHERE robot_models.name::varchar like '%RNR%' and robots.deleted_at is null
GROUP BY robots.id,robot_models.name,users.user_name
ORDER BY task_on_hand DESC LIMIT 2 OFFSET 0
and sorry for bad English!
Even though you are preloading, you are still required to explicitly use joins when filtering and ordering on columns on other tables. Preloading is used to eagerly load the data to map into your models, not to join tables.
Chain on something like this:
.Joins("LEFT JOIN rfm.robot_models AS robot_models ON robot_models.id = robots.robot_model_id")
I'm not positive if you can use the AS keyword using this technique, but if not, it should be easy enough to adjust your query accordingly.
How can i dynamically change the selected columns in the generated sql query when using a linq expression?
Its a new session for each time the query is executed.
Even when I set the MapExp as null after first creation an then changing the bool value to false, it still generates the column in the sql query.
The code runs in a wpf application.
System.Linq.Expressions.Expression<Func<Entity, Model>> MapExp = x => new Model
{
Id=xId,
Count= LoadFormulaField ? x.Count: null,
...
};
var result = session.Query<Entity>().Select(MapExp))
Your problem seems to be the ternary-conditional as part of the expression which is causing the "Count" column to always be queried.
One option to avoid this could be:
var query = session.Query<Entity>();
IQueryable<Model> result = null;
if (LoadFormulaField)
{
result = query.Select(x => new Model
{
Id = x.Id,
Count = x.Count,
});
}
else
{
result = query.Select(x => new Model
{
Id = x.Id,
});
}
Which would get a little less ugly if you separate in a couple of methods I think.
I have 2 linq queries. First query does nothing because of unique index and this is OK. But second also does nothing while it should add records . If I bypass first query second query works. Should I refresh entity ? How ?
foreach (var product in productList)
{
cc2nexo_SubiektProduct newproduct = new cc2nexo_SubiektProduct();
newproduct.Name = product.Name;
newproduct.VAT = product.VAT;
newproduct.Id = product.Id;
foreach (var stawkaVAT in myNexo_ExitoEntities.StawkiVat)
{
if (stawkaVAT.Stawka * 100 == tryconvert_dec(newproduct.VAT))
{
newproduct.VAT_Id = stawkaVAT.Id;
}
}
myNexo_ExitoEntities.cc2nexo_SubiektProduct.Add(newproduct);
SurroundWithTryCatchDB(() =>
{
myNexo_ExitoEntities.SaveChanges();
});
}
var orders = (from myorders in myNexo_ExitoEntities.temp_SubiektOrderList
select myorders).ToList();
foreach (var order in orders)
{
cc2nexo_SubiektOrderList neworder = new cc2nexo_SubiektOrderList();
neworder.Data_utworzenia_sprawy = tryconvert_date(order.Data_utworzenia_sprawy);
neworder.Data_modyfikacji_sprawy = tryconvert_date(order.Data_modyfikacji_sprawy);
neworder.Data_umowy = tryconvert_date(order.Data_umowy);
neworder.Id = order.Id;
myNexo_ExitoEntities.cc2nexo_SubiektOrderList.Add(neworder);
SurroundWithTryCatchDB(() =>
{
myNexo_ExitoEntities.SaveChanges();
});
Debug.WriteLine(neworder.LastName);
}
I am receiving an error
Cannot insert duplicate key row in object 'dbo.cc2nexo_SubiektProduct' with unique index 'K_ID'. The duplicate key value is (1).The statement has been terminated
The reason of problem was SurroundWithTryCatchDB procedure not listed in my question. Because first query caused exception due to unique index all next SaveChanges did not work. I have changed my first query to work with unique values and now everything is OK.
I need to filter some Entities by various fields using "normal" WHERE and IN clauses in a query over my database, but I do not know how to do that with EF.
This is the approach:
Database table
Licenses
-------------
license INT
number INT
name VARCHAR
...
desired SQL Query in EF
SELECT * FROM Licenses WHERE license = 1 AND number IN (1,2,3,45,99)
EF Code
using (DatabaseEntities db = new DatabaseEntities ())
{
return db.Licenses.Where(
i => i.license == mylicense
// another filter
).ToList();
}
I have tried with ANY and CONTAINS, but I do not know how to do that with EF.
How to do this query in EF?
int[] ids = new int[]{1,2,3,45,99};
using (DatabaseEntities db = new DatabaseEntities ())
{
return db.Licenses.Where(
i => i.license == mylicense
&& ids.Contains(i.number)
).ToList();
}
should work