/// <summary>
/// Shows how to get a specific number of sorted records, starting from an index, based on Search Parameters. The number of records are also retrieved.
/// </summary>
private void SelectSkipAndTakeDynamicWhere()
{
int startRetrievalFromRecordIndex = 0;
int numberOfRecordsToRetrieve = 10;
string sortBy = "EnrollmentId";
//string sortBy = "EnrollmentId desc";
// search parameters, everything is nullable, only items being searched for should be filled
// note: fields with String type uses a LIKE search, everything else uses an exact match
// also, every field you're searching for uses the AND operator
// e.g. int? productID = 1; string productName = "ch";
// will translate to: SELECT....WHERE productID = 1 AND productName LIKE '%ch%'
int? enrollmentId = null;
int? courseName = null;
int? studentName = null;
string comments = null;
// 1. select a specific number of sorted records starting from the index you specify based on Search Parameters
List <CourseEnrollment> objCourseEnrollmentCol = CourseEnrollment.SelectSkipAndTakeDynamicWhere(enrollmentId, courseName, studentName, comments, numberOfRecordsToRetrieve, startRetrievalFromRecordIndex, sortBy);
// to use objCourseEnrollmentCol please see the SelectAll() method examples
// No need for Examples 1 and 2 because the Collection here is already sorted
// Example 3: directly bind to a GridView - for ASP.NET Web Forms
// Example 4: loop through all the CourseEnrollment(s). The example above will only loop for 10 items.
}
/// <summary>
/// Gets the list of data for use by the jqgrid plug-in
/// </summary>
public IActionResult OnGetGridDataWithFilters(string sidx, string sord, int _page, int rows, string filters)
{
int? enrollmentId = null;
int? courseName = null;
int? studentName = null;
string comments = String.Empty;
if (!String.IsNullOrEmpty(filters))
{
// deserialize json and get values being searched
var jsonResult = JsonConvert.DeserializeObject <Dictionary <string, dynamic> >(filters);
foreach (var rule in jsonResult["rules"])
{
if (rule["field"].Value.ToLower() == "enrollmentid")
{
enrollmentId = Convert.ToInt32(rule["data"].Value);
}
if (rule["field"].Value.ToLower() == "coursename")
{
courseName = Convert.ToInt32(rule["data"].Value);
}
if (rule["field"].Value.ToLower() == "studentname")
{
studentName = Convert.ToInt32(rule["data"].Value);
}
if (rule["field"].Value.ToLower() == "comments")
{
comments = rule["data"].Value;
}
}
// sometimes jqgrid assigns a -1 to numeric fields when no value is assigned
// instead of assigning a null, we'll correct this here
if (enrollmentId == -1)
{
enrollmentId = null;
}
if (courseName == -1)
{
courseName = null;
}
if (studentName == -1)
{
studentName = null;
}
}
int totalRecords = CourseEnrollment.GetRecordCountDynamicWhere(enrollmentId, courseName, studentName, comments);
int startRowIndex = ((_page * rows) - rows);
List <CourseEnrollment> objCourseEnrollmentCol = CourseEnrollment.SelectSkipAndTakeDynamicWhere(enrollmentId, courseName, studentName, comments, rows, startRowIndex, sidx + " " + sord);
int totalPages = (int)Math.Ceiling((float)totalRecords / (float)rows);
if (objCourseEnrollmentCol is null)
{
return(new JsonResult("{ total = 0, page = 0, records = 0, rows = null }"));
}
var jsonData = new
{
total = totalPages,
_page,
records = totalRecords,
rows = (
from objCourseEnrollment in objCourseEnrollmentCol
select new
{
id = objCourseEnrollment.EnrollmentId,
cell = new string[] {
objCourseEnrollment.EnrollmentId.ToString(),
objCourseEnrollment.CourseName.ToString(),
objCourseEnrollment.StudentName.ToString(),
objCourseEnrollment.Comments
}
}).ToArray()
};
return(new JsonResult(jsonData));
}