Module: ArJdbc::Derby
Defined Under Namespace
Modules: Column
Constant Summary
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- COLUMN_INFO_STMT =
"SELECT C.COLUMNNAME, C.REFERENCEID, C.COLUMNNUMBER FROM SYS.SYSCOLUMNS C, SYS.SYSTABLES T WHERE T.TABLEID = '%s' AND T.TABLEID = C.REFERENCEID ORDER BY C.COLUMNNUMBER"
- COLUMN_TYPE_STMT =
"SELECT COLUMNDATATYPE, COLUMNDEFAULT FROM SYS.SYSCOLUMNS WHERE REFERENCEID = '%s' AND COLUMNNAME = '%s'"
- AUTO_INC_STMT =
"SELECT AUTOINCREMENTSTART, AUTOINCREMENTINC, COLUMNNAME, REFERENCEID, COLUMNDEFAULT FROM SYS.SYSCOLUMNS WHERE REFERENCEID = '%s' AND COLUMNNAME = '%s'"
- AUTO_INC_STMT2 =
"SELECT AUTOINCREMENTSTART, AUTOINCREMENTINC, COLUMNNAME, REFERENCEID, COLUMNDEFAULT FROM SYS.SYSCOLUMNS WHERE REFERENCEID = (SELECT T.TABLEID FROM SYS.SYSTABLES T WHERE T.TABLENAME = '%s') AND COLUMNNAME = '%s'"
- SIZEABLE =
%w(VARCHAR CLOB BLOB)
Class Method Summary
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Instance Method Summary
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#adapter_name ⇒ Object
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#add_column(table_name, column_name, type, options = {}) ⇒ Object
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#add_column_options!(sql, options) ⇒ Object
Override default – fix case where ActiveRecord passes :default => nil, :null => true.
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#add_limit_offset!(sql, options) ⇒ Object
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#add_quotes(name) ⇒ Object
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#auto_increment_stmt(tname, cname) ⇒ Object
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#change_column(table_name, column_name, type, options = {}) ⇒ Object
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#classes_for_table_name(table) ⇒ Object
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#columns(table_name, name = nil) ⇒ Object
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#create_column(name, refid, colno) ⇒ Object
I don’t think this method is ever called ??? (stepheneb).
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#distinct(columns, order_by) ⇒ Object
SELECT DISTINCT clause for a given set of columns and a given ORDER BY clause.
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#execute(sql, name = nil) ⇒ Object
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#expand_double_quotes(name) ⇒ Object
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#index_name_length ⇒ Object
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#modify_types(tp) ⇒ Object
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#primary_keys(table_name) ⇒ Object
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#quote_column_name(name) ⇒ Object
For DDL it appears you can quote “” column names, but in queries (like insert it errors out?).
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#quoted_false ⇒ Object
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#quoted_true ⇒ Object
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#recreate_database(db_name) ⇒ Object
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#reinstate_auto_increment(name, refid, coldef) ⇒ Object
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#remove_column(table_name, column_name) ⇒ Object
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#remove_index(table_name, options) ⇒ Object
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#rename_column(table_name, column_name, new_column_name) ⇒ Object
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#rename_table(name, new_name) ⇒ Object
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#reset_pk_sequence!(table, pk = nil, sequence = nil) ⇒ Object
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#reset_sequence!(table, column, sequence = nil) ⇒ Object
Set the sequence to the max value of the table’s column.
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#strip_quotes(str) ⇒ Object
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#structure_dump ⇒ Object
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#tables ⇒ Object
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#type_to_sql(type, limit = nil, precision = nil, scale = nil) ⇒ Object
Convert the speficied column type to a SQL string.
#alter_table, #copy_table, #copy_table_contents, #copy_table_indexes, #move_table
Class Method Details
.column_selector ⇒ Object
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# File 'lib/arjdbc/derby/adapter.rb', line 5
def self.column_selector
[/derby/i, lambda {|cfg,col| col.extend(::ArJdbc::Derby::Column)}]
end
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.extended(*args) ⇒ Object
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# File 'lib/arjdbc/derby/adapter.rb', line 30
def self.extended(*args)
monkey_rails
end
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.included(*args) ⇒ Object
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# File 'lib/arjdbc/derby/adapter.rb', line 34
def self.included(*args)
monkey_rails
end
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.monkey_rails ⇒ Object
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# File 'lib/arjdbc/derby/adapter.rb', line 9
def self.monkey_rails
unless @already_monkeyd
::ActiveRecord::Associations::ClassMethods.module_eval do
private
def select_limited_ids_list(options, join_dependency)
connection.select_all(
construct_finder_sql_for_association_limiting(options, join_dependency),
"#{name} Load IDs For Limited Eager Loading"
).collect { |row| connection.quote(row[primary_key], columns_hash[primary_key]) }.join(", ")
end
end
@already_monkeyd = true
end
end
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Instance Method Details
#adapter_name ⇒ Object
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# File 'lib/arjdbc/derby/adapter.rb', line 54
def adapter_name 'Derby'
end
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#add_column(table_name, column_name, type, options = {}) ⇒ Object
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# File 'lib/arjdbc/derby/adapter.rb', line 194
def add_column(table_name, column_name, type, options = {})
if option_not_null = options[:null] == false
option_not_null = options.delete(:null)
end
add_column_sql = "ALTER TABLE #{quote_table_name(table_name)} ADD #{quote_column_name(column_name)} #{type_to_sql(type, options[:limit], options[:precision], options[:scale])}"
add_column_options!(add_column_sql, options)
execute(add_column_sql)
if option_not_null
alter_column_sql = "ALTER TABLE #{quote_table_name(table_name)} ALTER #{quote_column_name(column_name)} NOT NULL"
end
end
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#add_column_options!(sql, options) ⇒ Object
Override default – fix case where ActiveRecord passes :default => nil, :null => true
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# File 'lib/arjdbc/derby/adapter.rb', line 82
def add_column_options!(sql, options)
options.delete(:default) if options.has_key?(:default) && options[:default].nil?
options.delete(:null) if options.has_key?(:null) && (options[:null].nil? || options[:null] == true)
super
end
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#add_limit_offset!(sql, options) ⇒ Object
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# File 'lib/arjdbc/derby/adapter.rb', line 413
def add_limit_offset!(sql, options) if options[:offset]
sql << " OFFSET #{options[:offset]} ROWS"
end
if options[:limit]
sql << " FETCH FIRST #{options[:limit]} ROWS ONLY"
end
end
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#add_quotes(name) ⇒ Object
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# File 'lib/arjdbc/derby/adapter.rb', line 122
def add_quotes(name)
return name unless name
%Q{"#{name}"}
end
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#auto_increment_stmt(tname, cname) ⇒ Object
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# File 'lib/arjdbc/derby/adapter.rb', line 174
def auto_increment_stmt(tname, cname)
stmt = AUTO_INC_STMT2 % [tname, strip_quotes(cname)]
data = execute(stmt).first
if data
start = data['autoincrementstart']
if start
coldef = ""
coldef << " GENERATED " << (data['columndefault'].nil? ? "ALWAYS" : "BY DEFAULT ")
coldef << "AS IDENTITY (START WITH "
coldef << start
coldef << ", INCREMENT BY "
coldef << data['autoincrementinc']
coldef << ")"
return coldef
end
end
""
end
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#change_column(table_name, column_name, type, options = {}) ⇒ Object
Notes about changing in Derby:
http://db.apache.org/derby/docs/10.2/ref/rrefsqlj81859.html
We support changing columns using the strategy outlined in:
https://issues.apache.org/jira/browse/DERBY-1515
This feature has not made it into a formal release and is not in Java 6. We will need to conditionally support this somehow (supposed to arrive for 10.3.0.0)
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# File 'lib/arjdbc/derby/adapter.rb', line 326
def change_column(table_name, column_name, type, options = {})
if options.include?(:null)
if options.delete(:null) == false
execute "ALTER TABLE #{table_name} ALTER COLUMN #{column_name} NOT NULL"
else
execute "ALTER TABLE #{table_name} ALTER COLUMN #{column_name} NULL"
end
end
unless options.empty?
begin
execute "ALTER TABLE #{table_name} ALTER COLUMN #{column_name} SET DATA TYPE #{type_to_sql(type, options[:limit])}"
rescue
transaction do
temp_new_column_name = "#{column_name}_newtype"
add_column table_name, temp_new_column_name, type, options
execute "UPDATE #{table_name} SET #{temp_new_column_name} = CAST(#{column_name} AS #{type_to_sql(type, options[:limit])})"
remove_column table_name, column_name
rename_column table_name, temp_new_column_name, column_name
end
end
end
end
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#classes_for_table_name(table) ⇒ Object
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# File 'lib/arjdbc/derby/adapter.rb', line 88
def classes_for_table_name(table)
ActiveRecord::Base.send(:subclasses).select {|klass| klass.table_name == table}
end
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#columns(table_name, name = nil) ⇒ Object
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# File 'lib/arjdbc/derby/adapter.rb', line 375
def columns(table_name, name=nil)
@connection.columns_internal(table_name.to_s, name, derby_schema)
end
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#create_column(name, refid, colno) ⇒ Object
I don’t think this method is ever called ??? (stepheneb)
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# File 'lib/arjdbc/derby/adapter.rb', line 242
def create_column(name, refid, colno)
stmt = COLUMN_TYPE_STMT % [refid, strip_quotes(name)]
coldef = ""
data = execute(stmt).first
if data
coldef << add_quotes(expand_double_quotes(strip_quotes(name)))
coldef << " "
coldef << data['columndatatype']
if !reinstate_auto_increment(name, refid, coldef) && data['columndefault']
coldef << " DEFAULT " << data['columndefault']
end
end
coldef
end
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#distinct(columns, order_by) ⇒ Object
SELECT DISTINCT clause for a given set of columns and a given ORDER BY clause.
Derby requires the ORDER BY columns in the select list for distinct queries, and requires that the ORDER BY include the distinct column.
distinct("posts.id", "posts.created_at desc")
Based on distinct method for PostgreSQL Adapter
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# File 'lib/arjdbc/derby/adapter.rb', line 226
def distinct(columns, order_by)
return "DISTINCT #{columns}" if order_by.blank?
order_columns = order_by.split(',').collect { |s| s.split.first }
order_columns.delete_if(&:blank?)
order_columns = order_columns.zip((0...order_columns.size).to_a).map { |s,i| "#{s} AS alias_#{i}" }
sql = "DISTINCT #{columns}, #{order_columns * ', '}"
sql
end
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#execute(sql, name = nil) ⇒ Object
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# File 'lib/arjdbc/derby/adapter.rb', line 206
def execute(sql, name = nil)
if sql =~ /^\s*(UPDATE|INSERT)/i
i = sql =~ /\swhere\s/im
if i
sql[i..-1] = sql[i..-1].gsub(/!=\s*NULL/, 'IS NOT NULL').gsub(/=\sNULL/i, 'IS NULL')
end
else
sql.gsub!(/= NULL/i, 'IS NULL')
end
super
end
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#expand_double_quotes(name) ⇒ Object
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# File 'lib/arjdbc/derby/adapter.rb', line 133
def expand_double_quotes(name)
return name unless name && name['"']
name.gsub(/"/,'""')
end
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#index_name_length ⇒ Object
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# File 'lib/arjdbc/derby/adapter.rb', line 60
def index_name_length
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end
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#modify_types(tp) ⇒ Object
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# File 'lib/arjdbc/derby/adapter.rb', line 73
def modify_types(tp)
tp[:primary_key] = "int generated by default as identity NOT NULL PRIMARY KEY"
tp[:integer][:limit] = nil
tp[:string][:limit] = 256
tp[:boolean] = {:name => "smallint"}
tp
end
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#primary_keys(table_name) ⇒ Object
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# File 'lib/arjdbc/derby/adapter.rb', line 371
def primary_keys(table_name)
@connection.primary_keys table_name.to_s.upcase
end
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#quote_column_name(name) ⇒ Object
For DDL it appears you can quote “” column names, but in queries (like insert it errors out?)
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# File 'lib/arjdbc/derby/adapter.rb', line 390
def quote_column_name(name) name = name.to_s
if /^(references|integer|key|group|year)$/i =~ name
%Q{"#{name.upcase}"}
elsif /[A-Z]/ =~ name && /[a-z]/ =~ name
%Q{"#{name}"}
elsif name =~ /[\s-]/
%Q{"#{name.upcase}"}
elsif name =~ /^[_\d]/
%Q{"#{name.upcase}"}
else
name
end
end
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#quoted_false ⇒ Object
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# File 'lib/arjdbc/derby/adapter.rb', line 409
def quoted_false
'0'
end
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#quoted_true ⇒ Object
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# File 'lib/arjdbc/derby/adapter.rb', line 405
def quoted_true
'1'
end
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#recreate_database(db_name) ⇒ Object
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# File 'lib/arjdbc/derby/adapter.rb', line 383
def recreate_database(db_name)
tables.each do |t|
drop_table t
end
end
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#reinstate_auto_increment(name, refid, coldef) ⇒ Object
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# File 'lib/arjdbc/derby/adapter.rb', line 138
def reinstate_auto_increment(name, refid, coldef)
stmt = AUTO_INC_STMT % [refid, strip_quotes(name)]
data = execute(stmt).first
if data
start = data['autoincrementstart']
if start
coldef << " GENERATED " << (data['columndefault'].nil? ? "ALWAYS" : "BY DEFAULT ")
coldef << "AS IDENTITY (START WITH "
coldef << start
coldef << ", INCREMENT BY "
coldef << data['autoincrementinc']
coldef << ")"
return true
end
end
false
end
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#remove_column(table_name, column_name) ⇒ Object
Support for removing columns added via derby bug issue: issues.apache.org/jira/browse/DERBY-1489
This feature has not made it into a formal release and is not in Java 6. If the normal strategy fails we fall back on a strategy by creating a new table without the new column and there after moving the data to the new
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# File 'lib/arjdbc/derby/adapter.rb', line 308
def remove_column(table_name, column_name)
begin
execute "ALTER TABLE #{table_name} DROP COLUMN #{column_name} RESTRICT"
rescue
alter_table(table_name) do |definition|
definition.columns.delete(definition[column_name])
end
end
end
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#remove_index(table_name, options) ⇒ Object
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# File 'lib/arjdbc/derby/adapter.rb', line 107
def remove_index(table_name, options) execute "DROP INDEX #{index_name(table_name, options)}"
end
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#rename_column(table_name, column_name, new_column_name) ⇒ Object
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# File 'lib/arjdbc/derby/adapter.rb', line 363
def rename_column(table_name, column_name, new_column_name) begin
execute "ALTER TABLE #{table_name} ALTER RENAME COLUMN #{column_name} TO #{new_column_name}"
rescue
alter_table(table_name, :rename => {column_name => new_column_name})
end
end
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#rename_table(name, new_name) ⇒ Object
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# File 'lib/arjdbc/derby/adapter.rb', line 111
def rename_table(name, new_name)
execute "RENAME TABLE #{name} TO #{new_name}"
end
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#reset_pk_sequence!(table, pk = nil, sequence = nil) ⇒ Object
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# File 'lib/arjdbc/derby/adapter.rb', line 98
def reset_pk_sequence!(table, pk = nil, sequence = nil)
klasses = classes_for_table_name(table)
klass = klasses.nil? ? nil : klasses.first
pk = klass.primary_key unless klass.nil?
if pk && klass.columns_hash[pk].type == :integer
reset_sequence!(klass.table_name, pk)
end
end
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#reset_sequence!(table, column, sequence = nil) ⇒ Object
Set the sequence to the max value of the table’s column.
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# File 'lib/arjdbc/derby/adapter.rb', line 93
def reset_sequence!(table, column, sequence = nil)
mpk = select_value("SELECT MAX(#{quote_column_name(column)}) FROM #{quote_table_name(table)}")
execute("ALTER TABLE #{quote_table_name(table)} ALTER COLUMN #{quote_column_name(column)} RESTART WITH #{mpk.to_i + 1}")
end
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#strip_quotes(str) ⇒ Object
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# File 'lib/arjdbc/derby/adapter.rb', line 127
def strip_quotes(str)
return str unless str
return str unless /^(["']).*\1$/ =~ str
str[1..-2]
end
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#structure_dump ⇒ Object
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# File 'lib/arjdbc/derby/adapter.rb', line 259
def structure_dump definition=""
rs = @connection.connection.meta_data.getTables(nil,nil,nil,["TABLE"].to_java(:string))
while rs.next
tname = rs.getString(3)
definition << "CREATE TABLE #{tname} (\n"
rs2 = @connection.connection.meta_data.getColumns(nil,nil,tname,nil)
first_col = true
while rs2.next
col_name = add_quotes(rs2.getString(4));
default = ""
d1 = rs2.getString(13)
if d1 =~ /^GENERATED_/
default = auto_increment_stmt(tname, col_name)
elsif d1
default = " DEFAULT #{d1}"
end
type = rs2.getString(6)
col_size = rs2.getString(7)
nulling = (rs2.getString(18) == 'NO' ? " NOT NULL" : "")
create_col_string = add_quotes(expand_double_quotes(strip_quotes(col_name))) +
" " +
type +
(SIZEABLE.include?(type) ? "(#{col_size})" : "") +
nulling +
default
if !first_col
create_col_string = ",\n #{create_col_string}"
else
create_col_string = " #{create_col_string}"
end
definition << create_col_string
first_col = false
end
definition << ");\n\n"
end
definition
end
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#tables ⇒ Object
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# File 'lib/arjdbc/derby/adapter.rb', line 379
def tables
@connection.tables(nil, derby_schema)
end
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#type_to_sql(type, limit = nil, precision = nil, scale = nil) ⇒ Object
Convert the speficied column type to a SQL string. In Derby, :integers cannot specify a limit.
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# File 'lib/arjdbc/derby/adapter.rb', line 66
def type_to_sql(type, limit = nil, precision = nil, scale = nil) return super unless type == :integer
native = native_database_types[type.to_s.downcase.to_sym]
native.is_a?(Hash) ? native[:name] : native
end
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