ISqlWhereBuilder.WhereIsNotNull(string left) Method

.NET Standard 2.x

Creates a WHERE clause, and adds a search condition to the WHERE clause. Uses IS NOT NULL operator to search for values that are not null.

Namespace: SnapObjects.Data

Assembly: SnapObjects.Data.dll

Syntax

  ISqlWhereAndOr WhereIsNotNull(string left);

Parameters

left System.String

A SQL expression on the left of the IS NOT NULL operator.

Returns

SnapObjects.Data.ISqlWhereAndOr

Returns the ISqlWhereAndOr object which can be used to add more search conditions to the current WHERE clause.

Examples

The following code example uses the AndWhereIsNotNull method to specify that data retrieved from the "Course" table must have a not null value for Title.

using SnapObjects.Data;
using System;

namespace Appeon.ApiDoc.ISqlWhereBuilderExamples
{
    public class WhereIsNotNullExample
    {
        private readonly SchoolContext _context;

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

        public void Example()
        {

            // Declares SqlQueryBuilder.
            var sqlbuilder = new SqlQueryBuilder();

            // Defines a SQL statement, and sets the WhereIsNotNull condition: Title cannot be null.
            sqlbuilder.Select("*")
                .From("Course")
                .WhereIsNotNull("Title");

            string sql = sqlbuilder.ToSqlString(_context);

            Console.WriteLine(sql);

            /*This code produces the following output:

            SELECT
            *
            FROM [Course]
            WHERE ([Title] IS NOT NULL)
           */
        }
    }
}

Applies to

.NET Standard

2.x