SqlBuilder.WhereIsNotNull(string left) Method

.NET Standard 2.x

Creates an ISqlWhereCondition object which represents a search condition that can be used when building the WHERE clause. Uses IS NOT NULL operator to search for values that are not null.

Namespace: SnapObjects.Data

Assembly: SnapObjects.Data.dll

Syntax

 public static ISqlWhereCondition WhereIsNotNull(string left);

Parameters

left System.String

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

Returns

SnapObjects.Data.ISqlWhereCondition

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

Examples

The following code example demonstrates how to use the WhereIsNotNull method to determine whether the specified field in the current table is null, and returns the data which is not null to a model.

using SnapObjects.Data;
using System;

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

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

        public void Example()
        {
            var sqlquerybuilder = new SqlQueryBuilder();
            
            // Defines a WHERE condition.
            var where = SqlBuilder.WhereIsNotNull("Title");

            // Creates a SQL statement.
            var query = sqlquerybuilder
                .Select("*")
                .From("Course")
                .Where(where);

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

            Console.WriteLine(sql);
            
            /*This code example produces the following output:   
             
            SELECT
            *
            FROM [Course]
            WHERE ([Title] IS NOT NULL)
            */
        }
    }
}

Applies to

.NET Standard

2.x