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(&: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 80 80: def date_add_sql_append(sql, da) 81: if defined?(super) 82: return super 83: end 84: 85: h = da.interval 86: expr = da.expr 87: cast_type = da.cast_type || Time 88: 89: cast = case db_type = db.database_type 90: when :postgres 91: interval = String.new 92: each_valid_interval_unit(h, DEF_DURATION_UNITS) do |value, sql_unit| 93: interval << "#{value} #{sql_unit} " 94: end 95: if interval.empty? 96: return literal_append(sql, Sequel.cast(expr, cast_type)) 97: else 98: return complex_expression_sql_append(sql, :+, [Sequel.cast(expr, cast_type), Sequel.cast(interval, :interval)]) 99: end 100: when :sqlite 101: args = [expr] 102: each_valid_interval_unit(h, DEF_DURATION_UNITS) do |value, sql_unit| 103: args << "#{value} #{sql_unit}" 104: end 105: return function_sql_append(sql, Sequel.function(:datetime, *args)) 106: when :mysql, :hsqldb 107: if db_type == :hsqldb 108: # HSQLDB requires 2.2.9+ for the DATE_ADD function 109: expr = Sequel.cast(expr, cast_type) 110: end 111: each_valid_interval_unit(h, MYSQL_DURATION_UNITS) do |value, sql_unit| 112: expr = Sequel.function(:DATE_ADD, expr, Sequel.lit(["INTERVAL ", " "], value, sql_unit)) 113: end 114: when :mssql, :h2, :access, :sqlanywhere 115: units = case db_type 116: when :mssql, :sqlanywhere 117: MSSQL_DURATION_UNITS 118: when :h2 119: H2_DURATION_UNITS 120: when :access 121: ACCESS_DURATION_UNITS 122: end 123: each_valid_interval_unit(h, units) do |value, sql_unit| 124: expr = Sequel.function(:DATEADD, sql_unit, value, expr) 125: end 126: when :derby 127: if expr.is_a?(Date) && !expr.is_a?(DateTime) 128: # Work around for https://issues.apache.org/jira/browse/DERBY-896 129: expr = Sequel.cast_string(expr) + ' 00:00:00' 130: end 131: each_valid_interval_unit(h, DERBY_DURATION_UNITS) do |value, sql_unit| 132: expr = Sequel.lit(["{fn timestampadd(#{sql_unit}, ", ", timestamp(", "))}"], value, expr) 133: end 134: when :oracle 135: each_valid_interval_unit(h, MYSQL_DURATION_UNITS) do |value, sql_unit| 136: expr = Sequel.+(expr, Sequel.lit(["INTERVAL ", " "], value.to_s, sql_unit)) 137: end 138: when :db2 139: expr = Sequel.cast(expr, cast_type) 140: each_valid_interval_unit(h, DB2_DURATION_UNITS) do |value, sql_unit| 141: expr = Sequel.+(expr, Sequel.lit(["", " "], value, sql_unit)) 142: end 143: false 144: else 145: raise Error, "date arithmetic is not implemented on #{db.database_type}" 146: end 147: 148: if cast 149: expr = Sequel.cast(expr, cast_type) 150: end 151: 152: literal_append(sql, expr) 153: end