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 71 71: def date_add_sql_append(sql, da) 72: if defined?(super) 73: return super 74: end 75: h = da.interval 76: expr = da.expr 77: cast = case db_type = db.database_type 78: when :postgres 79: interval = String.new 80: each_valid_interval_unit(h, DEF_DURATION_UNITS) do |value, sql_unit| 81: interval << "#{value} #{sql_unit} " 82: end 83: if interval.empty? 84: return literal_append(sql, Sequel.cast(expr, Time)) 85: else 86: return complex_expression_sql_append(sql, :+, [Sequel.cast(expr, Time), Sequel.cast(interval, :interval)]) 87: end 88: when :sqlite 89: args = [expr] 90: each_valid_interval_unit(h, DEF_DURATION_UNITS) do |value, sql_unit| 91: args << "#{value} #{sql_unit}" 92: end 93: return function_sql_append(sql, Sequel.function(:datetime, *args)) 94: when :mysql, :hsqldb 95: if db_type == :hsqldb 96: # HSQLDB requires 2.2.9+ for the DATE_ADD function 97: expr = Sequel.cast(expr, Time) 98: end 99: each_valid_interval_unit(h, MYSQL_DURATION_UNITS) do |value, sql_unit| 100: expr = Sequel.function(:DATE_ADD, expr, Sequel.lit(["INTERVAL ", " "], value, sql_unit)) 101: end 102: when :mssql, :h2, :access, :sqlanywhere 103: units = case db_type 104: when :mssql, :sqlanywhere 105: MSSQL_DURATION_UNITS 106: when :h2 107: H2_DURATION_UNITS 108: when :access 109: ACCESS_DURATION_UNITS 110: end 111: each_valid_interval_unit(h, units) do |value, sql_unit| 112: expr = Sequel.function(:DATEADD, sql_unit, value, expr) 113: end 114: when :derby 115: if expr.is_a?(Date) && !expr.is_a?(DateTime) 116: # Work around for https://issues.apache.org/jira/browse/DERBY-896 117: expr = Sequel.cast_string(expr) + ' 00:00:00' 118: end 119: each_valid_interval_unit(h, DERBY_DURATION_UNITS) do |value, sql_unit| 120: expr = Sequel.lit(["{fn timestampadd(#{sql_unit}, ", ", timestamp(", "))}"], value, expr) 121: end 122: when :oracle 123: each_valid_interval_unit(h, MYSQL_DURATION_UNITS) do |value, sql_unit| 124: expr = Sequel.+(expr, Sequel.lit(["INTERVAL ", " "], value.to_s, sql_unit)) 125: end 126: when :db2 127: expr = Sequel.cast(expr, Time) 128: each_valid_interval_unit(h, DB2_DURATION_UNITS) do |value, sql_unit| 129: expr = Sequel.+(expr, Sequel.lit(["", " "], value, sql_unit)) 130: end 131: false 132: else 133: raise Error, "date arithmetic is not implemented on #{db.database_type}" 134: end 135: 136: if cast 137: expr = Sequel.cast(expr, Time) 138: end 139: 140: literal_append(sql, expr) 141: end