Module: Sequel::MSSQL::DatasetMethods

Defined in:
lib/sequel_core/adapters/shared/mssql.rb

Instance Method Summary collapse

Instance Method Details

#complex_expression_sql(op, args) ⇒ Object 



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# File 'lib/sequel_core/adapters/shared/mssql.rb', line 38

def complex_expression_sql(op, args)
  case op
  when :'||'
    super(:+, args)
  else
    super(op, args)
  end
end

#full_text_search(cols, terms, opts = {}) ⇒ Object 



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# File 'lib/sequel_core/adapters/shared/mssql.rb', line 47

def full_text_search(cols, terms, opts = {})
  filter("CONTAINS (#{literal(cols)}, #{literal(terms)})")
end

#nolock ⇒ Object

Allows you to do .nolock on a query



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# File 'lib/sequel_core/adapters/shared/mssql.rb', line 52

def nolock
  clone(:with => "(NOLOCK)")
end

#select_sql(opts = nil) ⇒ Object Also known as: sql

Formats a SELECT statement using the given options and the dataset options.

Raises:



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# File 'lib/sequel_core/adapters/shared/mssql.rb', line 58

def select_sql(opts = nil)
  opts = opts ? @opts.merge(opts) : @opts

  if sql = opts[:sql]
    return sql
  end

  # ADD TOP to SELECT string for LIMITS
  if limit = opts[:limit]
    top = "TOP #{limit} "
    raise Error, "Offset not supported" if opts[:offset]
  end

  columns = opts[:select]
  # We had to reference const WILDCARD with its full path, because
  # the Ruby constant scope rules played against us (it was resolving it
  # as Sequel::Dataset::DatasetMethods::WILDCARD).
  select_columns = columns ? column_list(columns) : Sequel::Dataset::WILDCARD

  if distinct = opts[:distinct]
    distinct_clause = distinct.empty? ? "DISTINCT" : "DISTINCT ON (#{expression_list(distinct)})"
    sql = "SELECT #{top}#{distinct_clause} #{select_columns}"
  else
    sql = "SELECT #{top}#{select_columns}"
  end

  if opts[:from]
    sql << " FROM #{source_list(opts[:from])}"
  end

  # ADD WITH to SELECT string for NOLOCK
  if with = opts[:with]
    sql << " WITH #{with}"
  end

  if join = opts[:join]
    join.each{|j| sql << literal(j)}
  end

  if where = opts[:where]
    sql << " WHERE #{literal(where)}"
  end

  if group = opts[:group]
    sql << " GROUP BY #{expression_list(group)}"
  end

  if order = opts[:order]
    sql << " ORDER BY #{expression_list(order)}"
  end

  if having = opts[:having]
    sql << " HAVING #{literal(having)}"
  end

  if union = opts[:union]
    sql << (opts[:union_all] ? \
      " UNION ALL #{union.sql}" : " UNION #{union.sql}")
  end
  
  raise Error, "Intersect not supported" if opts[:intersect]
  raise Error, "Except not supported" if opts[:except]
  
  sql
end