IQueryAndOrBuilder<TModel>.AndWhere(string left, SqlBinaryOperator sqlOperator, ISqlBuilder sqlBuilder) Method

.NET Standard 2.x

Adds the AND logical operator and a search condition to the WHERE clause; and specifies a SQL expression on the left of the operator and a SQL subquery on the right.

Namespace: SnapObjects.Data

Assembly: SnapObjects.Data.dll

Syntax

  IQueryAndOrBuilder<TModel> AndWhere(string left, SqlBinaryOperator sqlOperator, ISqlBuilder sqlBuilder);

Parameters

left System.String

A SQL expression on the left of the operator.

SqlBinaryOperator SnapObjects.Data.SqlBinaryOperator

An enumeration value of SqlBinaryOperator, which is the operator to test the two expressions on the left and right.

sqlBuilder SnapObjects.Data.ISqlBuilder

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

Returns

IQueryAndOrBuilder<TModel>

Returns anIQueryAndOrBuilder<TModel> 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 AndWhere method to add an AND condition to the WHERE clause. In this example, the AND condition uses the result set of a subquery and the greater than operator ">".

using System;
using System.Collections.Generic;
using System.Linq;
using System.Threading.Tasks;
using Appeon.ApiDoc.Models.School;
using SnapObjects.Data;

namespace Appeon.ApiDoc.IQueryAndOrBuilderExamples
{
    public class AndWhereExample
    {
        private SchoolContext _context;
        
        public AndWhereExample(SchoolContext dataContext)
        {
            // Sets Data Context
            _context = dataContext;
        }

        public async Task<int> Example6()
        {
            // Get a QueryBuilder.
            var Builder = _context.SqlModelMapper.GetQueryBuilder<Person>();
            
            // Defines a subquery. The query result is DepartmentID = 4.
            var subsqlbuilder = new SqlQueryBuilder();
            subsqlbuilder.Select("DepartmentID")
                .From("Department")
                .WhereValue("Name", "Economics");
                
            Builder.Where("PersonID", SqlBinaryOperator.LessThan,
                            SqlBuilder.Parameter<int>("id"))
                   .AndWhere("PersonID", SqlBinaryOperator.GreaterThan, subsqlbuilder);
                   
            var result = (await Builder.LoadAsync(6)).ToList();
            
            foreach (var person in result)
            {
                Console.WriteLine("PersonID:    {0}", person.PersonID);
                Console.WriteLine("FirstName:   {0}", person.FirstName);
                Console.WriteLine("LastName:    {0}", person.LastName);
                Console.WriteLine("HireDate:    {0}", person.HireDate);
                Console.WriteLine("Discriminator:   {0}", person.Discriminator);
            }
            
            return result.Count;
            
            /*This code produces the following output:
            
                PersonID:    5
                FirstName:   Roger
                LastName:    Harui
                HireDate:    7/1/1998 12:00:00 AM
                Discriminator:   Instructor
            */
        }
    }
}

Example Refer To

Model Class: Person

Applies to

.NET Standard

2.x