SqlBuilder.Having(string left, string right) Method

.NET Standard 2.x

Creates an ISqlHavingCondition object which represents a search condition that can be used when building the HAVING clause. Specifies SQL expressions on both the left and right of the operator. The operator is '='.

Namespace: SnapObjects.Data

Assembly: SnapObjects.Data.dll

Syntax

 public static ISqlHavingCondition Having(string left, string right);

Parameters

left System.String

A SQL expression on the left of the operator.

right System.String

A SQL expression on the right of the operator.

Returns

SnapObjects.Data.ISqlHavingCondition

Returns the ISqlHavingCondition object which can be used to add more search conditions to the 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.SqlBuilderExamples
{
    public class HavingExample
    {
        private SchoolContext _context;

        public HavingExample(SchoolContext dataContext)
        {
            // Sets Data Context.
            _context = dataContext;
        }

        public void Example1()
        {
            var sqlQueryBuilder = new SqlQueryBuilder();

            // Defines a HAVING condition.
            var having = SqlBuilder
                .Having("StudentID", "6");

            // Builds a SQL statement to retrieve StudentID and sum(Grade) from the "StudentGrade" table, and
            // group records by StudentID and CourseID which meet the condition: StudentID = 6. 
            var  query = 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 = query.ToSqlString(_context);

            Console.WriteLine(sql);
            
            /*This code produces the following output:
            
            SELECT
            [StudentID],
            sum(Grade)
            FROM [StudentGrade]
            GROUP BY
            [StudentID],
            [CourseID]
            HAVING ([StudentID] = 6)  
            */
        }
    }
}

Applies to

.NET Standard

2.x