require 'active_record/connection_adapters/abstract_adapter'
module ActiveRecord
class Base
# Establishes a connection to the database that's used by all Active Record objects
def self.openbase_connection(config) # :nodoc:
require_library_or_gem 'openbase' unless self.class.const_defined?(:OpenBase)
config = config.symbolize_keys
host = config[:host]
username = config[:username].to_s
password = config[:password].to_s
if config.has_key?(:database)
database = config[:database]
else
raise ArgumentError, "No database specified. Missing argument: database."
end
oba = ConnectionAdapters::OpenBaseAdapter.new(
OpenBase.new(database, host, username, password), logger
)
oba
end
end
module ConnectionAdapters
class OpenBaseColumn < Column #:nodoc:
private
def simplified_type(field_type)
return :integer if field_type.downcase =~ /long/
return :float if field_type.downcase == "money"
return :binary if field_type.downcase == "object"
super
end
end
# The OpenBase adapter works with the Ruby/Openbase driver by Tetsuya Suzuki.
# http://www.spice-of-life.net/ruby-openbase/ (needs version 0.7.3+)
#
# Options:
#
# * <tt>:host</tt> -- Defaults to localhost
# * <tt>:username</tt> -- Defaults to nothing
# * <tt>:password</tt> -- Defaults to nothing
# * <tt>:database</tt> -- The name of the database. No default, must be provided.
#
# The OpenBase adapter will make use of OpenBase's ability to generate unique ids
# for any column with an unique index applied. Thus, if the value of a primary
# key is not specified at the time an INSERT is performed, the adapter will prefetch
# a unique id for the primary key. This prefetching is also necessary in order
# to return the id after an insert.
#
# Caveat: Operations involving LIMIT and OFFSET do not yet work!
#
# Maintainer: derrickspell@cdmplus.com
class OpenBaseAdapter < AbstractAdapter
def adapter_name
'OpenBase'
end
def native_database_types
{
:primary_key => "integer UNIQUE INDEX DEFAULT _rowid",
:string => { :name => "char", :limit => 4096 },
:text => { :name => "text" },
:integer => { :name => "integer" },
:float => { :name => "float" },
:datetime => { :name => "datetime" },
:timestamp => { :name => "timestamp" },
:time => { :name => "time" },
:date => { :name => "date" },
:binary => { :name => "object" },
:boolean => { :name => "boolean" }
}
end
def supports_migrations?
false
end
def prefetch_primary_key?(table_name = nil)
true
end
def default_sequence_name(table_name, primary_key) # :nodoc:
"#{table_name} #{primary_key}"
end
def next_sequence_value(sequence_name)
ary = sequence_name.split(' ')
if (!ary[1]) then
ary[0] =~ /(\w+)_nonstd_seq/
ary[0] = $1
end
@connection.unique_row_id(ary[0], ary[1])
end
# QUOTING ==================================================
def quote(value, column = nil)
if value.kind_of?(String) && column && column.type == :binary
"'#{@connection.insert_binary(value)}'"
else
super
end
end
def quoted_true
"1"
end
def quoted_false
"0"
end
# DATABASE STATEMENTS ======================================
def add_limit_offset!(sql, options) #:nodoc
if limit = options[:limit]
unless offset = options[:offset]
sql << " RETURN RESULTS #{limit}"
else
limit = limit + offset
sql << " RETURN RESULTS #{offset} TO #{limit}"
end
end
end
def select_all(sql, name = nil) #:nodoc:
select(sql, name)
end
def select_one(sql, name = nil) #:nodoc:
add_limit_offset!(sql,{:limit => 1})
results = select(sql, name)
results.first if results
end
def insert(sql, name = nil, pk = nil, id_value = nil, sequence_name = nil) #:nodoc:
execute(sql, name)
update_nulls_after_insert(sql, name, pk, id_value, sequence_name)
id_value
end
def execute(sql, name = nil) #:nodoc:
log(sql, name) { @connection.execute(sql) }
end
def update(sql, name = nil) #:nodoc:
execute(sql, name).rows_affected
end
alias_method :delete, :update #:nodoc:
#=begin
def begin_db_transaction #:nodoc:
execute "START TRANSACTION"
rescue Exception
# Transactions aren't supported
end
def commit_db_transaction #:nodoc:
execute "COMMIT"
rescue Exception
# Transactions aren't supported
end
def rollback_db_transaction #:nodoc:
execute "ROLLBACK"
rescue Exception
# Transactions aren't supported
end
#=end
# SCHEMA STATEMENTS ========================================
# Return the list of all tables in the schema search path.
def tables(name = nil) #:nodoc:
tables = @connection.tables
tables.reject! { |t| /\A_SYS_/ === t }
tables
end
def columns(table_name, name = nil) #:nodoc:
sql = "SELECT * FROM _sys_tables "
sql << "WHERE tablename='#{table_name}' AND INDEXOF(fieldname,'_')<>0 "
sql << "ORDER BY columnNumber"
columns = []
select_all(sql, name).each do |row|
columns << OpenBaseColumn.new(row["fieldname"],
default_value(row["defaultvalue"]),
sql_type_name(row["typename"],row["length"]),
row["notnull"]
)
# breakpoint() if row["fieldname"] == "content"
end
columns
end
def indexes(table_name, name = nil)#:nodoc:
sql = "SELECT fieldname, notnull, searchindex, uniqueindex, clusteredindex FROM _sys_tables "
sql << "WHERE tablename='#{table_name}' AND INDEXOF(fieldname,'_')<>0 "
sql << "AND primarykey=0 "
sql << "AND (searchindex=1 OR uniqueindex=1 OR clusteredindex=1) "
sql << "ORDER BY columnNumber"
indexes = []
execute(sql, name).each do |row|
indexes << IndexDefinition.new(table_name,index_name(row),row[3]==1,[row[0]])
end
indexes
end
private
def select(sql, name = nil)
sql = translate_sql(sql)
results = execute(sql, name)
date_cols = []
col_names = []
results.column_infos.each do |info|
col_names << info.name
date_cols << info.name if info.type == "date"
end
rows = []
if ( results.rows_affected )
results.each do |row| # loop through result rows
hashed_row = {}
row.each_index do |index|
hashed_row["#{col_names[index]}"] = row[index] unless col_names[index] == "_rowid"
end
date_cols.each do |name|
unless hashed_row["#{name}"].nil? or hashed_row["#{name}"].empty?
hashed_row["#{name}"] = Date.parse(hashed_row["#{name}"],false).to_s
end
end
rows << hashed_row
end
end
rows
end
def default_value(value)
# Boolean type values
return true if value =~ /true/
return false if value =~ /false/
# Date / Time magic values
return Time.now.to_s if value =~ /^now\(\)/i
# Empty strings should be set to null
return nil if value.empty?
# Otherwise return what we got from OpenBase
# and hope for the best...
return value
end
def sql_type_name(type_name, length)
return "#{type_name}(#{length})" if ( type_name =~ /char/ )
type_name
end
def index_name(row = [])
name = ""
name << "UNIQUE " if row[3]
name << "CLUSTERED " if row[4]
name << "INDEX"
name
end
def translate_sql(sql)
# Change table.* to list of columns in table
while (sql =~ /SELECT.*\s(\w+)\.\*/)
table = $1
cols = columns(table)
if ( cols.size == 0 ) then
# Maybe this is a table alias
sql =~ /FROM(.+?)(?:LEFT|OUTER|JOIN|WHERE|GROUP|HAVING|ORDER|RETURN|$)/
$1 =~ /[\s|,](\w+)\s+#{table}[\s|,]/ # get the tablename for this alias
cols = columns($1)
end
select_columns = []
cols.each do |col|
select_columns << table + '.' + col.name
end
sql.gsub!(table + '.*',select_columns.join(", ")) if select_columns
end
# Change JOIN clause to table list and WHERE condition
while (sql =~ /JOIN/)
sql =~ /((LEFT )?(OUTER )?JOIN (\w+) ON )(.+?)(?:LEFT|OUTER|JOIN|WHERE|GROUP|HAVING|ORDER|RETURN|$)/
join_clause = $1 + $5
is_outer_join = $3
join_table = $4
join_condition = $5
join_condition.gsub!(/=/,"*") if is_outer_join
if (sql =~ /WHERE/)
sql.gsub!(/WHERE/,"WHERE (#{join_condition}) AND")
else
sql.gsub!(join_clause,"#{join_clause} WHERE #{join_condition}")
end
sql =~ /(FROM .+?)(?:LEFT|OUTER|JOIN|WHERE|$)/
from_clause = $1
sql.gsub!(from_clause,"#{from_clause}, #{join_table} ")
sql.gsub!(join_clause,"")
end
# ORDER BY _rowid if no explicit ORDER BY
# This will ensure that find(:first) returns the first inserted row
if (sql !~ /(ORDER BY)|(GROUP BY)/)
if (sql =~ /RETURN RESULTS/)
sql.sub!(/RETURN RESULTS/,"ORDER BY _rowid RETURN RESULTS")
else
sql << " ORDER BY _rowid"
end
end
sql
end
def update_nulls_after_insert(sql, name = nil, pk = nil, id_value = nil, sequence_name = nil)
sql =~ /INSERT INTO (\w+) \((.*)\) VALUES\s*\((.*)\)/m
table = $1
cols = $2
values = $3
cols = cols.split(',')
values.gsub!(/'[^']*'/,"''")
values.gsub!(/"[^"]*"/,"\"\"")
values = values.split(',')
update_cols = []
values.each_index { |index| update_cols << cols[index] if values[index] =~ /\s*NULL\s*/ }
update_sql = "UPDATE #{table} SET"
update_cols.each { |col| update_sql << " #{col}=NULL," unless col.empty? }
update_sql.chop!()
update_sql << " WHERE #{pk}=#{quote(id_value)}"
execute(update_sql, name + " NULL Correction") if update_cols.size > 0
end
end
end
end
