ISqlJoinBuilder.FullJoin(ISqlBuilder sqlBuilder, string alias) Method

.NET Standard 2.x

Uses the FULL OUTER JOIN operator to join the original table source and the new table source (specified by a subquery generated by an ISqlBuilder object) to create a joined table. You need to specify an alias for the new table source.

Namespace: SnapObjects.Data

Assembly: SnapObjects.Data.dll

Syntax

  ISqlJoinOnBuilder FullJoin(ISqlBuilder sqlBuilder, string alias);

Parameters

sqlBuilder SnapObjects.Data.ISqlBuilder

An ISqlBuilder object which represents a subquery.

alias System.String

The alias of the new table source specified by the sqlBuilder parameter.

Returns

SnapObjects.Data.ISqlJoinOnBuilder

Returns an ISqlJoinOnBuilder object which can be used to create the condition on which the join is based.

Examples

The following code example demonstrates how to join a table with another using the FullJoin method.

using SnapObjects.Data;
using System;

namespace Appeon.ApiDoc.ISqlJoinBuilderExamples
{
    public class FullJoinExample
    {
        private readonly SchoolContext _context;

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

        public void Example4()
        {
            var sqlQueryBuilder = new SqlQueryBuilder();

            // Defines a query and gets DepartmentID and Title from the "Course" table.
            var sqlBuilder = new SqlQueryBuilder();
            sqlBuilder.Select("DepartmentID")
                      .Select("Title")
                      .From("Course");

            // Gets DepartmentID and Name from the "Department" table, and Title from the "Course" table.
            // Sets to join "Department" table and "Course" table by: Department.DepartmentID = Course.DepartmentID.
            // Specifies "Course" as the alias for the derived table.                      
            sqlQueryBuilder
                .Select("Department.DepartmentID")
                .Select("Department.Name")
                .Select("Course.Title")
                .From("Department")
                .FullJoin(sqlBuilder, "Course")
                .OnRaw("Department.DepartmentID = Course.DepartmentID");

            // 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]
              FULL JOIN (SELECT
                            [DepartmentID],
                            [Title]
                         FROM [Course]) AS [Course]
                   ON [Department].[DepartmentID] = [Course].[DepartmentID]
            */
        }
    }
}

Applies to

.NET Standard

2.x