ISqlHavingAndOr<TBuilder>.OrHaving(string left, ISqlBuilder sqlBuilder) Method

.NET Standard 2.x

Adds the OR logical operator and a search condition to the HAVING clause. Specifies a SQL expression on the left of the operator and a SQL subquery on the right of the operator. The operator is '='.

Namespace: SnapObjects.Data

Assembly: SnapObjects.Data.dll

Syntax

  TBuilder OrHaving(string left, ISqlBuilder sqlBuilder);

Parameters

left System.String

A SQL expression on the left of the operator.

sqlBuilder SnapObjects.Data.ISqlBuilder

An ISqlBuilder object which represents a SQL subquery on the right of the operator.

Returns

TBuilder

Returns the TBuilder 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 OrHaving method to add an OR condition to the HAVING clause.

using SnapObjects.Data;
using System;

namespace Appeon.ApiDoc.ISqlHavingAndOrExamples
{
    public class OrHavingExample
    {
        private readonly SchoolContext _context;

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

        public void Example5()
        {
            var sqlQueryBuilder = new SqlQueryBuilder();

            // Sets a query to get the smallest Course ID.
            var sqlBuilder = new SqlQueryBuilder();
            sqlBuilder.SelectRaw("min(CourseID)")
                      .From("Course");

            // Groups "StudentGrade" table by StudentID and CourseID, and gets the sum of Grade of each group.
            // Specifies the HAVING condition for group as "CourseID = 2030", or
            // CourseID equal to the return value of the subquery.
            sqlQueryBuilder
                .Select("StudentID")
                .Select("sum(Grade)")
                .From("StudentGrade")
                .GroupBy("StudentID, CourseID")
                .HavingRaw("CourseID = 2030")
                .OrHaving("CourseID", sqlBuilder);

            // 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 ([CourseID] = 2030
                OR [CourseID] = (SELECT
                                 MIN([CourseID])
                                 FROM [Course]))
           */
        }
    }
}

Applies to

.NET Standard

2.x