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    IQueryWhereBuilder.Where(string left, SqlBinaryOperator sqlOperator, ISqlBuilder sqlBuilder) Method

    .NET Standard 2.x

    Creates a WHERE clause, and adds a search condition to the WHERE clause. 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> Where(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 an IQueryAndOrBuilder<TModel> object which can be used to add more search conditions to the current WHERE clause.

    Examples

    The following code example uses the Where method to specify that the column value must be within the result set of a SQL subquery.

    using Appeon.ApiDoc.Models.School;
    using SnapObjects.Data;
    using System;
    using System.Threading.Tasks;
    
    namespace Appeon.ApiDoc.IQueryWhereBuilderExamples
    {
        public class WhereExample
        {
            private SchoolContext _context;
            
            public WhereExample(SchoolContext dataContext)
            {
                // Sets Data Context
                _context = dataContext;
            }
    
            public async Task<int> Example6()
            {
                // Get a QueryBuilder.
                var Builder = _context.SqlModelMapper.GetQueryBuilder<Person>();
                
                // Defines a subquery.
                var sqlbuilder = new SqlQueryBuilder();
                sqlbuilder.Select("DepartmentID")
                    .From("Department")
                    .WhereValue("Name", "Economics");
                    
                // Creates a WHERE clause, and adds a search condition to the WHERE clause.
                // Specifies a SQL expression on the left of the operator and a SQL 
                // subquery on the right.
                Builder.Where("PersonID", SqlBinaryOperator.Equals, sqlbuilder);
                
                var result = (await Builder.LoadAsync()).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:    4
                    FirstName:   Fadi
                    LastName:    Fakhouri
                    HireDate:    8/6/2002 12:00:00 AM
                    Discriminator:   Instructor
                */
            }
        }
    }
    

    Example Refer To

    Model Class: Person

    Applies to

    .NET Standard

    2.x

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