ISqlHavingBuilder.Having(ISqlHavingCondition condition) Method

.NET Standard 2.x

Creates a HAVING clause, and adds a search condition to the HAVING clause by an ISqlHavingCondition object.

Namespace: SnapObjects.Data

Assembly: SnapObjects.Data.dll

Syntax

  ISqlHavingAndOr Having(ISqlHavingCondition condition);

Parameters

condition SnapObjects.Data.ISqlParameter

An ISqlHavingCondition object which represents a search condition in the HAVING clause.

This object can be created by using the SqlBuilder.Having method and so on.

Returns

SnapObjects.Data.ISqlHavingAndOr

Returns the ISqlHavingAndOr object which can be used to add more search conditions to the current HAVING clause.

Examples

The following code example demonstrates how to use the Having method to specify the HAVING condition for groups.

using SnapObjects.Data;
using System;

namespace Appeon.ApiDoc.ISqlHavingBuilderExamples
{
    public class HavingExample
    {
        private readonly SchoolContext _context;

        public HavingExample(SchoolContext dataContext)
        {
            // Sets the data context.
            _context = dataContext;
        }

        public void Example7()
        {
            var sqlQueryBuilder = new SqlQueryBuilder();

            // Defines a HAVING condition.
            var having = SqlBuilder.HavingRaw("StudentID < 10");

            // Groups "StudentGrade" table by StudentID and CourseID, and gets the sum of Grade of each group. 
            // The HAVING condition for group is the condition defined above: StudentID < 10.               
            sqlQueryBuilder
                .Select("StudentID")
                .Select("sum(Grade)")
                .From("StudentGrade")
                .GroupBy("StudentID, CourseID")
                .Having(having);

            // Converts to raw SQL for the database corresponding to the data context.               
            string sql = sqlQueryBuilder.ToSqlString(_context);

            Console.WriteLine(sql);

            /*This code example produces the following output:           
              SELECT
                [StudentID],
                sum(Grade)
              FROM [StudentGrade]
              GROUP BY
                [StudentID],
                [CourseID]
                HAVING ([StudentID] < 10)
           */
        }
    }
}

Applies to

.NET Standard

2.x