SqlBuilder.EmbeddedOn(string left, SqlBinaryOperator sqlOperator, ISqlParameter parameter) Method

.NET Standard 2.x

Creates an ISqlJoinCondition object which represents a search condition that can be used (enclosed in parentheses) when building the ON clause. Specifies SQL expressions on both the left and right of the operator.

Namespace: SnapObjects.Data

Assembly: SnapObjects.Data.dll

Syntax

 public static ISqlJoinCondition EmbeddedOn(string left, SqlBinaryOperator sqlOperator, ISqlParameter parameter);

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.

parameter SnapObjects.Data.ISqlParameter

A SQL expression on the right of the operator.

Returns

SnapObjects.Data.ISqlJoinCondition

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

Remarks

The newly created search condition is enclosed in parentheses. If the returned ISqlJoinCondition object is used to add another search condition, both of these search conditions will be enclosed in the same pair of parentheses.

Examples

The following code example demonstrates how to use the EmbeddedOn(string left, SqlOperator sqlOperator, ISqlParam parameter) method to set the condition to join one table with another.

using SnapObjects.Data;
using System;

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

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

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

            // Defines an embedded JOIN condition.
            var join = SqlBuilder.EmbeddedOn("Department.DepartmentID",
                    SqlBinaryOperator.GreaterThan,
                    SqlBuilder.Parameter<int>("departmentid"));

            // Creates a SQL statement.       
            var query = sqlQueryBuilder
                .Select("Department.DepartmentID")
                .Select("Department.Name")
                .Select("Course.Title")
                .From("Department")
                .Join("Course")
                .On(join);

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

            Console.WriteLine(sql);
            
            /*This code produces the following output:
            
            SELECT
            [Department].[DepartmentID],
            [Department].[Name],
            [Course].[Title]
            FROM [Department] JOIN [Course]
            ON [Department].[DepartmentID] > @departmentid
            */
        }
    }
}

Applies to

.NET Standard

2.x