Class: Sequel::ODBC::Dataset

Inherits:
Dataset show all
Defined in:
lib/sequel_core/adapters/odbc.rb

Direct Known Subclasses

MSSQL::Dataset

Constant Summary collapse

BOOL_TRUE = 
'1'.freeze
BOOL_FALSE = 
'0'.freeze
ODBC_TIMESTAMP_FORMAT = 
"{ts '%Y-%m-%d %H:%M:%S'}".freeze
ODBC_TIMESTAMP_AFTER_SECONDS = 
ODBC_TIMESTAMP_FORMAT.index( '%S' ).succ - ODBC_TIMESTAMP_FORMAT.length
ODBC_DATE_FORMAT = 
"{d '%Y-%m-%d'}".freeze
UNTITLED_COLUMN = 
'untitled_%d'.freeze

Constants inherited from Dataset

Dataset::AND_SEPARATOR, Dataset::COLUMN_CHANGE_OPTS, Dataset::COLUMN_REF_RE1, Dataset::COLUMN_REF_RE2, Dataset::COLUMN_REF_RE3, Dataset::COMMA_SEPARATOR, Dataset::COUNT_OF_ALL_AS_COUNT, Dataset::DATASET_CLASSES, Dataset::DATE_FORMAT, Dataset::JOIN_TYPES, Dataset::MUTATION_METHODS, Dataset::NOTIMPL_MSG, Dataset::NULL, Dataset::N_ARITY_OPERATORS, Dataset::QUESTION_MARK, Dataset::STOCK_COUNT_OPTS, Dataset::STOCK_TRANSFORMS, Dataset::TIMESTAMP_FORMAT, Dataset::TWO_ARITY_OPERATORS, Dataset::WILDCARD

Instance Attribute Summary

Attributes inherited from Dataset

#db, #opts, #quote_identifiers, #row_proc

Instance Method Summary collapse

Methods inherited from Dataset

#<<, #[], #[]=, #all, #and, #as, #avg, #clone, #column_all_sql, #column_expr_sql, #columns, #columns!, #complex_expression_sql, #count, #create_or_replace_view, #create_view, dataset_classes, #def_mutation_method, def_mutation_method, #delete_sql, #each, #each_page, #empty?, #except, #exclude, #exists, #filter, #first, #first_source, #from, #from_self, #function_sql, #get, #graph, #grep, #group, #group_and_count, #having, inherited, #initialize, #insert_multiple, #insert_sql, #inspect, #intersect, #interval, #invert, #join_table, #last, #limit, #map, #max, #min, #model_classes, #multi_insert, #multi_insert_sql, #naked, #or, #order, #order_more, #paginate, #polymorphic_key, #print, #qualified_column_ref_sql, #query, #quote_identifier, #quote_identifiers?, #quoted_identifier, #range, #reverse_order, #select, #select_all, #select_more, #select_sql, #set, #set_graph_aliases, #set_model, #single_record, #single_value, #subscript_sql, #sum, #symbol_to_column_ref, #table_exists?, #to_csv, #to_hash, #transform, #transform_load, #transform_save, #unfiltered, #union, #uniq, #unordered, #update_sql

Methods included from Enumerable

#send_each

Constructor Details

This class inherits a constructor from Sequel::Dataset

Instance Method Details

#convert_odbc_value(v) ⇒ Object 



133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
 
# File 'lib/sequel_core/adapters/odbc.rb', line 133

def convert_odbc_value(v)
  # When fetching a result set, the Ruby ODBC driver converts all ODBC 
  # SQL types to an equivalent Ruby type; with the exception of
  # SQL_TYPE_DATE, SQL_TYPE_TIME and SQL_TYPE_TIMESTAMP.
  #
  # The conversions below are consistent with the mappings in
  # ODBCColumn#mapSqlTypeToGenericType and Column#klass.
  case v
  when ::ODBC::TimeStamp
    DateTime.new(v.year, v.month, v.day, v.hour, v.minute, v.second)
  when ::ODBC::Time
    DateTime.now
    Time.gm(now.year, now.month, now.day, v.hour, v.minute, v.second)
  when ::ODBC::Date
    Date.new(v.year, v.month, v.day)
  else
    v
  end
end

#delete(opts = nil) ⇒ Object 



162
163
164
 
# File 'lib/sequel_core/adapters/odbc.rb', line 162

def delete(opts = nil)
  @db.do delete_sql(opts)
end

#fetch_rows(sql, &block) ⇒ Object 



91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
 
# File 'lib/sequel_core/adapters/odbc.rb', line 91

def fetch_rows(sql, &block)
  @db.synchronize do
    s = @db.execute sql
    begin
      untitled_count = 0
      @columns = s.columns(true).map do |c|
        if (n = c.name).empty?
          n = UNTITLED_COLUMN % (untitled_count += 1)
        end
        n.to_sym
      end
      rows = s.fetch_all
      rows.each {|row| yield hash_row(row)} if rows
    ensure
      s.drop unless s.nil? rescue nil
    end
  end
  self
end

#hash_row(row) ⇒ Object

def fetch_rows(sql, &block) @db.synchronize do s = @db.execute sql begin @columns = s.columns(true).map {|c| c.name.to_sym} rows = s.fetch_all rows.each {|row| yield hash_row(row)} ensure s.drop unless s.nil? rescue nil end end self end



125
126
127
128
129
130
131
 
# File 'lib/sequel_core/adapters/odbc.rb', line 125

def hash_row(row)
  hash = {}
  row.each_with_index do |v, idx|
    hash[@columns[idx]] = convert_odbc_value(v)
  end
  hash
end

#insert(*values) ⇒ Object 



153
154
155
 
# File 'lib/sequel_core/adapters/odbc.rb', line 153

def insert(*values)
  @db.do insert_sql(*values)
end

#literal(v) ⇒ Object 



71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
 
# File 'lib/sequel_core/adapters/odbc.rb', line 71

def literal(v)
  case v
  when true
    BOOL_TRUE
  when false
    BOOL_FALSE
  when Time, DateTime
    formatted = v.strftime(ODBC_TIMESTAMP_FORMAT)
    usec = (Time === v ? v.usec : (v.sec_fraction * 86400000000))
    formatted.insert(ODBC_TIMESTAMP_AFTER_SECONDS, ".#{(usec.to_f/1000).round}") if usec >= 1000
    formatted
  when Date
    v.strftime(ODBC_DATE_FORMAT)
  else
    super
  end
end

#update(*args, &block) ⇒ Object 



157
158
159
160
 
# File 'lib/sequel_core/adapters/odbc.rb', line 157

def update(*args, &block)
  @db.do update_sql(*args, &block)
  self
end