Module: ThinkingSphinx::Source::SQL

Included in:
ThinkingSphinx::Source
Defined in:
lib/thinking_sphinx/source/sql.rb

Instance Method Summary collapse

Instance Method Details

#crc_column ⇒ Object 



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# File 'lib/thinking_sphinx/source/sql.rb', line 118

def crc_column
  if @model.table_exists? &&
    @model.column_names.include?(@model.inheritance_column)
    
    types = types_to_crcs
    return @model.to_crc32.to_s if types.empty?
    
    adapter.case(adapter.convert_nulls(
      adapter.quote_with_table(@model.inheritance_column)),
      types_to_crcs, @model.to_crc32)
  else
    @model.to_crc32.to_s
  end
end

#quote_column(column) ⇒ Object 



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# File 'lib/thinking_sphinx/source/sql.rb', line 114

def quote_column(column)
  @model.connection.quote_column_name(column)
end

#sql_group_clause ⇒ Object 



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# File 'lib/thinking_sphinx/source/sql.rb', line 88

def sql_group_clause
  internal_groupings = []
  if @model.column_names.include?(@model.inheritance_column)
     internal_groupings << "#{@model.quoted_table_name}.#{quote_column(@model.inheritance_column)}"
  end

  (
    ["#{@model.quoted_table_name}.#{quote_column(@model.primary_key_for_sphinx)}"] + 
    @fields.collect     { |field|     field.to_group_sql     }.compact +
    @attributes.collect { |attribute| attribute.to_group_sql }.compact +
    @groupings + internal_groupings
  ).join(", ")
end

#sql_query_pre_for_core ⇒ Object 



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# File 'lib/thinking_sphinx/source/sql.rb', line 102

def sql_query_pre_for_core
  if self.delta? && !@index.delta_object.reset_query(@model).blank?
    [@index.delta_object.reset_query(@model)]
  else
    []
  end
end

#sql_query_pre_for_delta ⇒ Object 



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# File 'lib/thinking_sphinx/source/sql.rb', line 110

def sql_query_pre_for_delta
  [""]
end

#sql_select_clause(offset) ⇒ Object 



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# File 'lib/thinking_sphinx/source/sql.rb', line 63

def sql_select_clause(offset)
  unique_id_expr = ThinkingSphinx.unique_id_expression(offset)

  (
    ["#{@model.quoted_table_name}.#{quote_column(@model.primary_key_for_sphinx)} #{unique_id_expr} AS #{quote_column(@model.primary_key_for_sphinx)} "] + 
    @fields.collect     { |field|     field.to_select_sql     } +
    @attributes.collect { |attribute| attribute.to_select_sql }
  ).compact.join(", ")
end

#sql_where_clause(options) ⇒ Object 



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# File 'lib/thinking_sphinx/source/sql.rb', line 73

def sql_where_clause(options)
  logic = []
  logic += [
    "#{@model.quoted_table_name}.#{quote_column(@model.primary_key_for_sphinx)} >= $start",
    "#{@model.quoted_table_name}.#{quote_column(@model.primary_key_for_sphinx)} <= $end"
  ] unless @index.options[:disable_range]

  if self.delta? && !@index.delta_object.clause(@model, options[:delta]).blank?
    logic << "#{@index.delta_object.clause(@model, options[:delta])}"
  end

  logic += (@conditions || [])
  logic.join(' AND ')
end

#to_sql(options = {}) ⇒ Object

Generates the big SQL statement to get the data back for all the fields and attributes, using all the relevant association joins. If you want the version filtered for delta values, send through :delta => true in the options. Won’t do much though if the index isn’t set up to support a delta sibling.

Examples:

source.to_sql
source.to_sql(:delta => true)



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# File 'lib/thinking_sphinx/source/sql.rb', line 15

def to_sql(options={})
  relation    = @model.unscoped
  pre_select  = 'SQL_NO_CACHE ' if adapter.sphinx_identifier == "mysql"
  relation    = relation.select(
    pre_select.to_s + sql_select_clause(options[:offset])
  )

  all_associations.each do |assoc|
    relation = relation.joins(assoc.arel_join)
  end

  relation = relation.where(sql_where_clause(options))
  relation = relation.group(sql_group_clause)
  relation = relation.order('NULL') if adapter.sphinx_identifier == "mysql"
  relation.to_sql
end

#to_sql_query_info(offset) ⇒ Object

Simple helper method for the query info SQL - which is a statement that returns the single row for a corresponding id.



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# File 'lib/thinking_sphinx/source/sql.rb', line 58

def to_sql_query_info(offset)
  "SELECT * FROM #{@model.quoted_table_name} WHERE " +
  "#{quote_column(@model.primary_key_for_sphinx)} = (($id - #{offset}) / #{ThinkingSphinx.context.indexed_models.size})"
end

#to_sql_query_range(options = {}) ⇒ Object

Simple helper method for the query range SQL - which is a statement that returns minimum and maximum id values. These can be filtered by delta - so pass in :delta => true to get the delta version of the SQL.



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# File 'lib/thinking_sphinx/source/sql.rb', line 36

def to_sql_query_range(options={})
  return nil if @index.options[:disable_range]
  
  min_statement = adapter.convert_nulls(
    "MIN(#{quote_column(@model.primary_key_for_sphinx)})", 1
  )
  max_statement = adapter.convert_nulls(
    "MAX(#{quote_column(@model.primary_key_for_sphinx)})", 1
  )

  sql = "SELECT #{min_statement}, #{max_statement} " +
        "FROM #{@model.quoted_table_name} "
  if self.delta? && !@index.delta_object.clause(@model, options[:delta]).blank?
    sql << "WHERE #{@index.delta_object.clause(@model, options[:delta])}"
  end

  sql
end

#type_values ⇒ Object 



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# File 'lib/thinking_sphinx/source/sql.rb', line 133

def type_values
  @model.connection.select_values <<-SQL
SELECT DISTINCT #{@model.inheritance_column}
FROM #{@model.table_name}
  SQL
end

#types_to_crcs ⇒ Object 



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# File 'lib/thinking_sphinx/source/sql.rb', line 140

def types_to_crcs
  type_values.compact.inject({}) { |hash, type|
    hash[type] = type.to_crc32
    hash
  }
end