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 |
FDBSQL_DURATION_UNITS | = | DURATION_UNITS.zip(DURATION_UNITS.map{|s| Sequel.lit(s.to_s.chop).freeze}).freeze |
Append the SQL fragment for the DateAdd expression to the SQL query.
# File lib/sequel/extensions/date_arithmetic.rb, line 72 72: def date_add_sql_append(sql, da) 73: if defined?(super) 74: return super 75: end 76: h = da.interval 77: expr = da.expr 78: cast = case db_type = db.database_type 79: when :postgres 80: interval = String.new 81: each_valid_interval_unit(h, DEF_DURATION_UNITS) do |value, sql_unit| 82: interval << "#{value} #{sql_unit} " 83: end 84: if interval.empty? 85: return literal_append(sql, Sequel.cast(expr, Time)) 86: else 87: return complex_expression_sql_append(sql, :+, [Sequel.cast(expr, Time), Sequel.cast(interval, :interval)]) 88: end 89: when :sqlite 90: args = [expr] 91: each_valid_interval_unit(h, DEF_DURATION_UNITS) do |value, sql_unit| 92: args << "#{value} #{sql_unit}" 93: end 94: return function_sql_append(sql, Sequel.function(:datetime, *args)) 95: when :mysql, :hsqldb, :cubrid 96: if db_type == :hsqldb 97: # HSQLDB requires 2.2.9+ for the DATE_ADD function 98: expr = Sequel.cast(expr, Time) 99: end 100: each_valid_interval_unit(h, MYSQL_DURATION_UNITS) do |value, sql_unit| 101: expr = Sequel.function(:DATE_ADD, expr, Sequel.lit(["INTERVAL ", " "], value, sql_unit)) 102: end 103: when :mssql, :h2, :access, :sqlanywhere 104: units = case db_type 105: when :mssql, :sqlanywhere 106: MSSQL_DURATION_UNITS 107: when :h2 108: H2_DURATION_UNITS 109: when :access 110: ACCESS_DURATION_UNITS 111: end 112: each_valid_interval_unit(h, units) do |value, sql_unit| 113: expr = Sequel.function(:DATEADD, sql_unit, value, expr) 114: end 115: when :derby 116: if expr.is_a?(Date) && !expr.is_a?(DateTime) 117: # Work around for https://issues.apache.org/jira/browse/DERBY-896 118: expr = Sequel.cast_string(expr) + ' 00:00:00' 119: end 120: each_valid_interval_unit(h, DERBY_DURATION_UNITS) do |value, sql_unit| 121: expr = Sequel.lit(["{fn timestampadd(#{sql_unit}, ", ", timestamp(", "))}"], value, expr) 122: end 123: when :oracle 124: each_valid_interval_unit(h, MYSQL_DURATION_UNITS) do |value, sql_unit| 125: expr = Sequel.+(expr, Sequel.lit(["INTERVAL ", " "], value.to_s, sql_unit)) 126: end 127: when :db2 128: expr = Sequel.cast(expr, Time) 129: each_valid_interval_unit(h, DB2_DURATION_UNITS) do |value, sql_unit| 130: expr = Sequel.+(expr, Sequel.lit(["", " "], value, sql_unit)) 131: end 132: false 133: else 134: raise Error, "date arithmetic is not implemented on #{db.database_type}" 135: end 136: 137: if cast 138: expr = Sequel.cast(expr, Time) 139: end 140: 141: literal_append(sql, expr) 142: end