Module | Sequel::SQL::DateAdd::DatasetMethods |
In: |
lib/sequel/extensions/date_arithmetic.rb
|
These methods are added to datasets using the date_arithmetic extension, for the purposes of correctly literalizing DateAdd expressions for the appropriate database type.
DURATION_UNITS | = | [:years, :months, :days, :hours, :minutes, :seconds].freeze |
DEF_DURATION_UNITS | = | DURATION_UNITS.zip(DURATION_UNITS.map{|s| s.to_s.freeze}).freeze |
MYSQL_DURATION_UNITS | = | DURATION_UNITS.zip(DURATION_UNITS.map{|s| Sequel.lit(s.to_s.upcase[0...-1]).freeze}).freeze |
MSSQL_DURATION_UNITS | = | DURATION_UNITS.zip(DURATION_UNITS.map{|s| Sequel.lit(s.to_s[0...-1]).freeze}).freeze |
H2_DURATION_UNITS | = | DURATION_UNITS.zip(DURATION_UNITS.map{|s| s.to_s[0...-1].freeze}).freeze |
DERBY_DURATION_UNITS | = | DURATION_UNITS.zip(DURATION_UNITS.map{|s| Sequel.lit("SQL_TSI_#{s.to_s.upcase[0...-1]}").freeze}).freeze |
ACCESS_DURATION_UNITS | = | DURATION_UNITS.zip(%w'yyyy m d h n s'.map{|s| s.freeze}).freeze |
DB2_DURATION_UNITS | = | DURATION_UNITS.zip(DURATION_UNITS.map{|s| Sequel.lit(s.to_s).freeze}).freeze |
Append the SQL fragment for the DateAdd expression to the SQL query.
# File lib/sequel/extensions/date_arithmetic.rb, line 66 66: def date_add_sql_append(sql, da) 67: h = da.interval 68: expr = da.expr 69: cast = case db_type = db.database_type 70: when :postgres 71: interval = "" 72: each_valid_interval_unit(h, DEF_DURATION_UNITS) do |value, sql_unit| 73: interval << "#{value} #{sql_unit} " 74: end 75: if interval.empty? 76: return literal_append(sql, Sequel.cast(expr, Time)) 77: else 78: return complex_expression_sql_append(sql, :+, [Sequel.cast(expr, Time), Sequel.cast(interval, :interval)]) 79: end 80: when :sqlite 81: args = [expr] 82: each_valid_interval_unit(h, DEF_DURATION_UNITS) do |value, sql_unit| 83: args << "#{value} #{sql_unit}" 84: end 85: return _function_sql_append(sql, :datetime, args) 86: when :mysql, :hsqldb, :cubrid 87: if db_type == :hsqldb 88: # HSQLDB requires 2.2.9+ for the DATE_ADD function 89: expr = Sequel.cast(expr, Time) 90: end 91: each_valid_interval_unit(h, MYSQL_DURATION_UNITS) do |value, sql_unit| 92: expr = Sequel.function(:DATE_ADD, expr, Sequel.lit(["INTERVAL ", " "], value, sql_unit)) 93: end 94: when :mssql, :h2, :access 95: units = case db_type 96: when :mssql 97: MSSQL_DURATION_UNITS 98: when :h2 99: H2_DURATION_UNITS 100: when :access 101: ACCESS_DURATION_UNITS 102: end 103: each_valid_interval_unit(h, units) do |value, sql_unit| 104: expr = Sequel.function(:DATEADD, sql_unit, value, expr) 105: end 106: when :derby 107: if expr.is_a?(Date) && !expr.is_a?(DateTime) 108: # Work around for https://issues.apache.org/jira/browse/DERBY-896 109: expr = Sequel.cast_string(expr) + ' 00:00:00' 110: end 111: each_valid_interval_unit(h, DERBY_DURATION_UNITS) do |value, sql_unit| 112: expr = Sequel.lit(["{fn timestampadd(#{sql_unit}, ", ", timestamp(", "))}"], value, expr) 113: end 114: when :oracle 115: each_valid_interval_unit(h, MYSQL_DURATION_UNITS) do |value, sql_unit| 116: expr = Sequel.+(expr, Sequel.lit(["INTERVAL ", " "], value.to_s, sql_unit)) 117: end 118: when :db2 119: expr = Sequel.cast(expr, Time) 120: each_valid_interval_unit(h, DB2_DURATION_UNITS) do |value, sql_unit| 121: expr = Sequel.+(expr, Sequel.lit(["", " "], value, sql_unit)) 122: end 123: false 124: else 125: raise Error, "date arithmetic is not implemented on #{db.database_type}" 126: end 127: 128: if cast 129: expr = Sequel.cast(expr, Time) 130: end 131: 132: literal_append(sql, expr) 133: end