ISqlJoinOnAndOr<TBuilder>.OrOn(string left, SqlBinaryOperator sqlOperator, ISqlBuilder sqlBuilder) Method

.NET Standard 2.x

Adds the OR logical operator and a search condition to the ON 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

  TBuilder OrOn(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

TBuilder

Returns the TBuilder object which can be used to add more search conditions to the current ON clause.

Examples

The following code example joins one table with another based on multiple OR conditions. It uses the OrOn method to add the OR condition.

using SnapObjects.Data;
using System;

namespace Appeon.ApiDoc.ISqlJoinOnAndOrExamples
{
    public class OrOnExample
    {
        private readonly SchoolContext _context;

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

        public void Example6()
        {
            var sqlQueryBuilder = new SqlQueryBuilder();

            // Sets a query to get the largest DepartmentID.
            var sqlBuilder = new SqlQueryBuilder();
            sqlBuilder.SelectRaw("max(DepartmentID)")
                .From("Department");

            // Gets DepartmentID values and Name values from the "Department" table, and Titles from the "Course" table.
            // Sets the condition to join the "Department" table and the "Course" table: 
            // Department.DepartmentID = Course.DepartmentID, or Department.DepartmentID less than the largest DepartmentID returned by the query.               
            sqlQueryBuilder
                .Select("Department.DepartmentID")
                .Select("Department.Name")
                .Select("Course.Title")
                .From("Department")
                .Join("Course")
                .OnRaw("Department.DepartmentID = Course.DepartmentID")
                .OrOn("Department.DepartmentID",
                    SqlBinaryOperator.LessThan, sqlBuilder);

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

            Console.WriteLine(sql);
            
            /*This code example produces the following output:           
              SELECT
                [Department].[DepartmentID],
                [Department].[Name],
                [Course].[Title]
              FROM [Department] JOIN [Course]
              ON [Department].[DepartmentID] = [Course].[DepartmentID]
              OR [Department].[DepartmentID] < (SELECT
                                                   MAX([DepartmentID])
                                                FROM [Department])
            */
        }
    }
}

Applies to

.NET Standard

2.x