Module: Sequel::SqlAnywhere::DatasetMethods

Included in:
JDBC::SqlAnywhere::Dataset, Dataset
Defined in:
lib/sequel/adapters/shared/sqlanywhere.rb

Constant Summary collapse

BOOL_TRUE = 
'1'.freeze
BOOL_FALSE = 
'0'.freeze
WILDCARD = 
LiteralString.new('%').freeze
TOP = 
" TOP ".freeze
START_AT = 
" START AT ".freeze
SQL_WITH_RECURSIVE = 
"WITH RECURSIVE ".freeze
DATE_FUNCTION = 
'today()'.freeze
NOW_FUNCTION = 
'now()'.freeze
DATEPART = 
'datepart'.freeze
REGEXP = 
'REGEXP'.freeze
NOT_REGEXP = 
'NOT REGEXP'.freeze
APOS = 
Dataset::APOS
APOS_RE = 
Dataset::APOS_RE
DOUBLE_APOS = 
Dataset::DOUBLE_APOS
BACKSLASH_RE = 
/\\/.freeze
QUAD_BACKSLASH = 
"\\\\\\\\".freeze
BLOB_START = 
"0x".freeze
HSTAR = 
"H*".freeze
CROSS_APPLY = 
'CROSS APPLY'.freeze
OUTER_APPLY = 
'OUTER APPLY'.freeze
ONLY_OFFSET = 
" TOP 2147483647".freeze

Instance Attribute Summary collapse

Instance Method Summary collapse

Instance Attribute Details

#convert_smallint_to_bool ⇒ Object

Whether to convert smallint to boolean arguments for this dataset. Defaults to the SqlAnywhere module setting.



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# File 'lib/sequel/adapters/shared/sqlanywhere.rb', line 275

def convert_smallint_to_bool
  defined?(@convert_smallint_to_bool) ? @convert_smallint_to_bool : (@convert_smallint_to_bool = @db.convert_smallint_to_bool)
end

Instance Method Details

#complex_expression_sql_append(sql, op, args) ⇒ Object

SQLAnywhere uses + for string concatenation, and LIKE is case insensitive by default.



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# File 'lib/sequel/adapters/shared/sqlanywhere.rb', line 317

def complex_expression_sql_append(sql, op, args)
  case op
  when :'||'
    super(sql, :+, args)
  when :<<, :>>
    complex_expression_emulate_append(sql, op, args)
  when :LIKE, :"NOT LIKE"
    sql << Sequel::Dataset::PAREN_OPEN
    literal_append(sql, args.at(0))
    sql << Sequel::Dataset::SPACE << (op == :LIKE ? REGEXP : NOT_REGEXP) << Sequel::Dataset::SPACE
    pattern = ''
    last_c = ''
    args.at(1).each_char do |c|
      if  c == '_' and not pattern.end_with?('\\') and last_c != '\\'
        pattern << '.'
      elsif c == '%' and not pattern.end_with?('\\') and last_c != '\\'
        pattern << '.*'
      elsif c == '[' and not pattern.end_with?('\\') and last_c != '\\'
        pattern << '\['
      elsif c == ']' and not pattern.end_with?('\\') and last_c != '\\'
        pattern << '\]'
      elsif c == '*' and not pattern.end_with?('\\') and last_c != '\\'
        pattern << '\*'
      elsif c == '?' and not pattern.end_with?('\\') and last_c != '\\'
        pattern << '\?'
      else
        pattern << c
      end
      if c == '\\' and last_c == '\\'
        last_c = ''
      else
        last_c = c
      end
    end
    literal_append(sql, pattern)
    sql << Sequel::Dataset::ESCAPE
    literal_append(sql, Sequel::Dataset::BACKSLASH)
    sql << Sequel::Dataset::PAREN_CLOSE
  when :ILIKE, :"NOT ILIKE"
    super(sql, (op == :ILIKE ? :LIKE : :"NOT LIKE"), args)
  when :extract
    sql << DATEPART + Sequel::Dataset::PAREN_OPEN
    literal_append(sql, args.at(0))
    sql << ','
    literal_append(sql, args.at(1))
    sql << Sequel::Dataset::PAREN_CLOSE
  else
    super
  end
end

#constant_sql_append(sql, constant) ⇒ Object

Use Date() and Now() for CURRENT_DATE and CURRENT_TIMESTAMP



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# File 'lib/sequel/adapters/shared/sqlanywhere.rb', line 374

def constant_sql_append(sql, constant)
  case constant
  when :CURRENT_DATE
    sql << DATE_FUNCTION
  when :CURRENT_TIMESTAMP, :CURRENT_TIME
    sql << NOW_FUNCTION
  else
    super
  end
end

#cross_apply(table) ⇒ Object

Uses CROSS APPLY to join the given table into the current dataset.



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# File 'lib/sequel/adapters/shared/sqlanywhere.rb', line 307

def cross_apply(table)
  join_table(:cross_apply, table)
end

#escape_like(string) ⇒ Object

SqlAnywhere uses \ to escape metacharacters, but a ‘]’ should not be escaped



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# File 'lib/sequel/adapters/shared/sqlanywhere.rb', line 369

def escape_like(string)
  string.gsub(/[\\%_\[]/){|m| "\\#{m}"}
end

#into(table) ⇒ Object

Specify a table for a SELECT … INTO query.



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# File 'lib/sequel/adapters/shared/sqlanywhere.rb', line 386

def into(table)
  clone(:into => table)
end

#recursive_cte_requires_column_aliases? ⇒ Boolean

SqlAnywhere requires recursive CTEs to have column aliases.

Returns:

  • (Boolean) 


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# File 'lib/sequel/adapters/shared/sqlanywhere.rb', line 312

def recursive_cte_requires_column_aliases?
  true
end

#supports_cte?(type = :select) ⇒ Boolean

Returns:

  • (Boolean) 


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# File 'lib/sequel/adapters/shared/sqlanywhere.rb', line 282

def supports_cte?(type=:select)
  type == :select || type == :insert
end

#supports_is_true? ⇒ Boolean

Returns:

  • (Boolean) 


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# File 'lib/sequel/adapters/shared/sqlanywhere.rb', line 294

def supports_is_true?
  false
end

#supports_join_using? ⇒ Boolean

Returns:

  • (Boolean) 


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# File 'lib/sequel/adapters/shared/sqlanywhere.rb', line 298

def supports_join_using?
  false
end

#supports_multiple_column_in? ⇒ Boolean

Returns:

  • (Boolean) 


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# File 'lib/sequel/adapters/shared/sqlanywhere.rb', line 286

def supports_multiple_column_in?
  false
end

#supports_timestamp_usecs? ⇒ Boolean

Returns:

  • (Boolean) 


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# File 'lib/sequel/adapters/shared/sqlanywhere.rb', line 302

def supports_timestamp_usecs?
  false
end

#supports_where_true? ⇒ Boolean

Returns:

  • (Boolean) 


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# File 'lib/sequel/adapters/shared/sqlanywhere.rb', line 290

def supports_where_true?
  false
end