ISqlWhereAndOr<TBuilder>.AndWhereIsNotNull(string left) Method

.NET Standard 2.x

Adds the AND logical operator and a search condition to the WHERE clause; and uses IS NOT NULL operator to search for values that are not null.

Namespace: SnapObjects.Data

Assembly: SnapObjects.Data.dll

Syntax

  TBuilder AndWhereIsNotNull(string left);

Parameters

left System.String

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

Returns

TBuilder

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

Examples

The following code example demonstrates how to use the AndWhereIsNotNull method to add an AND IS NOT NULL condition to the WHERE clause. In this example, the IS NOT NULL condition specifies that the Title value cannot be null.

using SnapObjects.Data;
using System;

namespace Appeon.ApiDoc.ISqlWhereAndOrExamples
{
    public class AndWhereIsNotNullExample
    {
        private readonly SchoolContext _context;

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

        public void Example()
        {

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

            // Defines a SQL statement, and adds an AND IS NOT NULL condition: Title cannot be null.
            sqlbuilder.Select("*")
                .From("Course")
                .Where("CourseID", SqlBinaryOperator.GreaterThan,
                        SqlBuilder.Parameter<int>("courid"))
                .AndWhereIsNotNull("Title");

            string sql = sqlbuilder.ToSqlString(_context);

            Console.WriteLine(sql);

            /*This code produces the following output:

            SELECT
            *
            FROM [Course]
            WHERE ([CourseID] > @courid
            AND [Title] IS NOT NULL)
           */
        }
    }
}

Applies to

.NET Standard

2.x