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    ISqlJoinOnBuilder.On(string left, ISqlBuilder sqlBuilder) Method

    .NET Standard 2.x

    Creates an ON clause and adds a search condition to it. Specifies the SQL expression on the left of the operator and the SQL subquery on the right. The operator is '='.

    Namespace: SnapObjects.Data

    Assembly: SnapObjects.Data.dll

    Syntax

      ISqlJoinOnAndOr On(string left, ISqlBuilder sqlBuilder);
    

    Parameters

    left System.String

    A SQL expression on the left of the operator.

    sqlBuilder SnapObjects.Data.ISqlBuilder

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

    Returns

    SnapObjects.Data.ISqlJoinOnAndOr

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

    Examples

    The following code example uses the On method to set Sets the condition to join one table with another.

    using SnapObjects.Data;
    using System;
    
    namespace Appeon.ApiDoc.ISqlJoinOnBuilderExamples
    {
        public class OnExample
        {
            private readonly SchoolContext _context;
    
            public OnExample(SchoolContext dataContext)
            {
                // Sets data context.
                _context = dataContext;
            }
    
            public void Example5()
            {
                ISqlQueryBuilder sqlQueryBuilder = new SqlQueryBuilder();
    
                // Sets a query to get the largest DepartmentID.
                ISqlQueryBuilder sqlBuilder = new SqlQueryBuilder();
                sqlBuilder.SelectRaw("max(DepartmentID)")
                    .From("Department");
    
                // Gets DepartmentID values and Name values from the "Department" table, 
                // and the Title values from the "Course" table.
                // Sets the condition to join the "Department" and "Course" tables: 
                // Department.DepartmentID equal to the largest DepartmentID returned from the query.                  
                sqlQueryBuilder
                    .Select("Department.DepartmentID")
                    .Select("Department.Name")
                    .Select("Course.Title")
                    .From("Department")
                    .Join("Course")
                    .On("Department.DepartmentID", 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] = (SELECT
                                                        MAX([DepartmentID])
                                                    FROM [Department])
                */
            }
        }
    }
    

    Applies to

    .NET Standard

    2.x

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