Class: NativeQuery::Query

Inherits:
Object
  • Object
show all
Defined in:
lib/native-query/query.rb

Overview

Represents ORM query.

Instance Method Summary collapse

Constructor Details

#initialize(connection, table, &block) ⇒ Query

Constructor.



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# File 'lib/native-query/query.rb', line 81

def initialize(connection, table, &block)
    @connection = connection
    @table = table
    @fields = [ ]
    @where = [ ]
    @having = [ ]
    @joins = [ ]
    @order = [ ]
    @group = [ ]
end

Dynamic Method Handling

This class handles dynamic methods through the method_missing method

#method_missing(sym, *args, &block) ⇒ Object

Calls mapping to joins specification. Call name is name of the target table.

Block works by the same way as query, but for join. But intra-join calls doesn’t work because it returns Query too.



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# File 'lib/native-query/query.rb', line 100

def method_missing(sym, *args, &block)
    join = Join::new(@table, sym)

    if args and not args.empty?
        join.fields(*args)
    end
    
    if not block.nil?
        join.instance_eval(&block)
    end
    
    @joins << join
    return self
end

Instance Method Details

#build ⇒ Object Also known as: build!

Builds itself to string.



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# File 'lib/native-query/query.rb', line 256

def build
    self.get.query.build
end

#fields(*args) ⇒ Object

Selects fields which to load.



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# File 'lib/native-query/query.rb', line 119

def fields(*args)
    @fields += args
    return self
end

#get ⇒ Object

Returns result object.



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# File 'lib/native-query/query.rb', line 185

def get
    
    # Builds query
    
        # Process joins
        join_fields, wheres, append_joins = self._process_joins
        
        # Checkouts regular fields
        if @joins.empty?
            fields = @fields
            hashes = [ ]
            group = @group
        else
            fields = @fields.map { |i| __fix_field(i) } 
            hashes = fields.reject { |i| not i.hash? }
            fields -= hashes
        end
        
        
        query = @connection.query
        
        if not fields.empty?
            query.select(fields)
        end
        
        if not join_fields.empty?
            query.select(join_fields)
        end
        
        if not hashes.empty?
            hashes.each do |hash|
                query.select(hash)
            end
        end


        query.from(@table)

        # Appends joins
        append_joins.call(query)
        
        # Where conditions
        wheres += self._fix_where
        wheres.each { |i| query.where(*i) }
        
        # Where conditions
        havings = self._fix_having
        havings.each { |i| query.having(*i) }
          
        # Grouping, ordering and having settings
        self._process_grouping(query)
        self._process_ordering(query)
        
        # Limit and offset
        if not @limit.nil?
            query.limit(@limit)
        end
        
        if not @offset.nil?
            query.offset(@offset)
        end

    # Returns
    return Result::new(query)
    
end

#group(*fields) ⇒ Object

Sets group by to load.



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# File 'lib/native-query/query.rb', line 176

def group(*fields)
    @group = fields
    return self
end

#having(*args) ⇒ Object

Selects having conditions to load.



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# File 'lib/native-query/query.rb', line 137

def having(*args)
    @having << args
    return self
end

#limit(limit) ⇒ Object

Sets limit to load.



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# File 'lib/native-query/query.rb', line 158

def limit(limit)
    @limit = limit
    return self
end

#offset(offset) ⇒ Object

Sets offset to load.



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# File 'lib/native-query/query.rb', line 167

def offset(offset)
    @offset = offset
    return self
end

#order(*args) ⇒ Object

Selects fields for ordering according them. Default order is :asc.

Expects [:<field>, [:asc|:desc]]+ arguments.



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# File 'lib/native-query/query.rb', line 149

def order(*args)
    @order += args
    return self
end

#where(*args) ⇒ Object

Selects where conditions to load.



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# File 'lib/native-query/query.rb', line 128

def where(*args)
    @where << args
    return self
end