Module: ArJdbc::PostgreSQL
- Included in:
- ActiveRecord::ConnectionAdapters::PostgreSQLAdapter
- Defined in:
- lib/arjdbc/postgresql/adapter.rb,
lib/arjdbc/postgresql/column.rb,
lib/arjdbc/postgresql/oid_types.rb,
lib/arjdbc/postgresql/explain_support.rb,
lib/arjdbc/postgresql/schema_creation.rb
Overview
Strives to provide Rails built-in PostgreSQL adapter (API) compatibility.
Defined Under Namespace
Classes: SchemaCreation
Constant Summary collapse
- ADAPTER_NAME =
'PostgreSQL'.freeze
- NATIVE_DATABASE_TYPES =
{ :primary_key => "serial primary key", :string => { :name => "character varying", :limit => 255 }, :text => { :name => "text" }, :integer => { :name => "integer" }, :float => { :name => "float" }, :numeric => { :name => "numeric" }, :decimal => { :name => "decimal" }, # :limit => 1000 :datetime => { :name => "timestamp" }, :timestamp => { :name => "timestamp" }, :time => { :name => "time" }, :date => { :name => "date" }, :binary => { :name => "bytea" }, :boolean => { :name => "boolean" }, :xml => { :name => "xml" }, # AR-JDBC added : #:timestamptz => { :name => "timestamptz" }, #:timetz => { :name => "timetz" }, :money => { :name=>"money" }, :char => { :name => "char" }, :serial => { :name => "serial" }, # auto-inc integer, bigserial, smallserial }
Class Method Summary collapse
Instance Method Summary collapse
- #adapter_name ⇒ Object
-
#add_column(table_name, column_name, type, options = {}) ⇒ Object
Adds a new column to the named table.
-
#add_index(table_name, column_name, options = {}) ⇒ Object
unless const_defined? :SchemaCreation.
-
#add_order_by_for_association_limiting!(sql, options) ⇒ Object
ORDER BY clause for the passed order option.
- #all_schemas ⇒ Object
-
#change_column(table_name, column_name, type, options = {}) ⇒ Object
Changes the column of a table.
-
#change_column_default(table_name, column_name, default) ⇒ Object
Changes the default value of a table column.
-
#change_column_null(table_name, column_name, null, default = nil) ⇒ Object
unless const_defined? :SchemaCreation.
-
#client_min_messages ⇒ Object
Returns the current client message level.
-
#client_min_messages=(level) ⇒ Object
Set the client message level.
-
#collation ⇒ Object
Returns the current database collation.
-
#columns_for_distinct(columns, orders) ⇒ Object
PostgreSQL requires the ORDER BY columns in the select list for distinct queries, and requires that the ORDER BY include the distinct column.
-
#configure_connection ⇒ Object
Configures the encoding, verbosity, schema search path, and time zone of the connection.
-
#create_database(name, options = {}) ⇒ Object
Create a new PostgreSQL database.
- #create_savepoint(name = current_savepoint_name(true)) ⇒ Object
-
#create_schema(schema_name, pg_username = nil) ⇒ Object
Creates a schema for the given schema name.
-
#ctype ⇒ Object
Returns the current database ctype.
-
#current_database ⇒ Object
current database name.
-
#current_schema ⇒ Object
Returns the current schema name.
- #default_sequence_name(table_name, pk = nil) ⇒ Object
- #disable_extension(name) ⇒ Object
- #disable_referential_integrity ⇒ Object
- #distinct(columns, orders) ⇒ Object
- #drop_database(name) ⇒ Object
-
#drop_schema(schema_name) ⇒ Object
Drops the schema for the given schema name.
-
#enable_extension(name) ⇒ Object
NOTE: only since AR-4.0 but should not hurt on other versions.
-
#encoding ⇒ Object
Returns the current database encoding format.
- #escape_bytea(string) ⇒ Object
- #exec_insert(sql, name, binds, pk = nil, sequence_name = nil) ⇒ Object
- #extension_enabled?(name) ⇒ Boolean
- #extensions ⇒ Object
- #index_algorithms ⇒ Object
- #index_name_exists?(table_name, index_name, default) ⇒ Boolean
- #index_name_length ⇒ Object
-
#indexes(table_name, name = nil) ⇒ Object
Returns an array of indexes for the given table.
- #insert_sql(sql, name = nil, pk = nil, id_value = nil, sequence_name = nil, binds = []) ⇒ Object
- #jdbc_column_class ⇒ Object
- #last_insert_id(table, sequence_name = nil) ⇒ Object
- #last_insert_id_result(sequence_name) ⇒ Object
-
#last_inserted_id(result) ⇒ Integer, NilClass
Take an id from the result of an INSERT query.
-
#migration_keys ⇒ Object
Adds
:array
as a valid migration key. -
#multi_column_index_limit ⇒ Object
Gets the maximum number columns postgres has, default 32.
-
#multi_column_index_limit=(limit) ⇒ Object
Sets the maximum number columns postgres has, default 32.
- #native_database_types ⇒ Object
-
#pk_and_sequence_for(table) ⇒ Object
Find a table's primary key and sequence.
- #postgresql_version ⇒ Object
-
#prepare_column_options(column, types) ⇒ Object
Adds
:array
option to the default set provided by theAbstractAdapter
. - #primary_key(table) ⇒ Object
- #quote(value, column = nil) ⇒ String
- #quote_bit(value) ⇒ String
- #quote_column_name(name) ⇒ Object
-
#quote_string(string) ⇒ String
Quotes a string, escaping any ' (single quote) and \ (backslash) chars.
- #quote_table_name(name) ⇒ Object
- #quote_table_name_for_assignment(table, attr) ⇒ Object
-
#quoted_date(value) ⇒ Object
Quote date/time values for use in SQL input.
- #recreate_database(name, options = {}) ⇒ Object
- #release_savepoint(name = current_savepoint_name) ⇒ Object
- #remove_index!(table_name, index_name) ⇒ Object
-
#rename_column(table_name, column_name, new_column_name) ⇒ Object
unless const_defined? :SchemaCreation.
- #rename_index(table_name, old_name, new_name) ⇒ Object
- #rename_table(table_name, new_name) ⇒ Object
-
#reset_pk_sequence!(table, pk = nil, sequence = nil) ⇒ Object
Resets sequence to the max value of the table's primary key if present.
- #rollback_to_savepoint(name = current_savepoint_name) ⇒ Object
- #schema_creation ⇒ Object
-
#schema_exists?(name) ⇒ Boolean
Returns true if schema exists.
-
#schema_names ⇒ Object
Returns an array of schema names.
-
#schema_search_path ⇒ Object
Returns the active schema search path.
-
#schema_search_path=(schema_csv) ⇒ Object
Sets the schema search path to a string of comma-separated schema names.
-
#session_auth=(user) ⇒ Object
Set the authorized user for this session.
- #set_client_encoding(encoding) ⇒ Object
-
#set_standard_conforming_strings ⇒ Object
Enable standard-conforming strings if available.
- #sql_for_insert(sql, pk, id_value, sequence_name, binds) ⇒ Object
-
#standard_conforming_strings=(enable) ⇒ Object
Enable standard-conforming strings if available.
- #standard_conforming_strings? ⇒ Boolean
-
#structure_dump ⇒ Object
deprecated
Deprecated.
no longer used - handled with (AR built-in) Rake tasks
- #supports_ddl_transactions? ⇒ Boolean
- #supports_disable_referential_integrity? ⇒ Boolean
- #supports_extensions? ⇒ Boolean
- #supports_hex_escaped_bytea? ⇒ Boolean
- #supports_index_sort_order? ⇒ Boolean
- #supports_insert_with_returning? ⇒ Boolean
-
#supports_migrations? ⇒ Boolean
Does PostgreSQL support migrations?.
- #supports_partial_index? ⇒ Boolean
-
#supports_primary_key? ⇒ Boolean
Does PostgreSQL support finding primary key on non-Active Record tables?.
-
#supports_ranges? ⇒ Boolean
Range data-types weren't introduced until PostgreSQL 9.2.
- #supports_savepoints? ⇒ Boolean
-
#supports_standard_conforming_strings? ⇒ Boolean
Does PostgreSQL support standard conforming strings?.
- #supports_transaction_isolation?(level = nil) ⇒ Boolean
- #supports_views? ⇒ Boolean
-
#table_alias_length ⇒ Object
Returns the configured supported identifier length supported by PostgreSQL, or report the default of 63 on PostgreSQL 7.x.
-
#table_exists?(name) ⇒ Boolean
Returns true if table exists.
- #tables(name = nil) ⇒ Object
- #truncate(table_name, name = nil) ⇒ Object
- #type_cast(value, column, array_member = false) ⇒ Object
-
#type_to_sql(type, limit = nil, precision = nil, scale = nil) ⇒ Object
Maps logical Rails types to PostgreSQL-specific data types.
- #use_insert_returning? ⇒ Boolean
Class Method Details
.arel_visitor_type(config = nil) ⇒ Object
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# File 'lib/arjdbc/postgresql/adapter.rb', line 44 def self.arel_visitor_type(config = nil) ::Arel::Visitors::PostgreSQL end |
.column_selector ⇒ Object
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# File 'lib/arjdbc/postgresql/column.rb', line 5 def self.column_selector [ /postgre/i, lambda { |cfg, column| column.extend(Column) } ] end |
.jdbc_connection_class ⇒ Object
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# File 'lib/arjdbc/postgresql/adapter.rb', line 26 def self.jdbc_connection_class ::ActiveRecord::ConnectionAdapters::PostgreSQLJdbcConnection end |
Instance Method Details
#adapter_name ⇒ Object
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# File 'lib/arjdbc/postgresql/adapter.rb', line 56 def adapter_name ADAPTER_NAME end |
#add_column(table_name, column_name, type, options = {}) ⇒ Object
Adds a new column to the named table. See TableDefinition#column for details of the options you can use.
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# File 'lib/arjdbc/postgresql/adapter.rb', line 1061 def add_column(table_name, column_name, type, = {}) default = [:default] notnull = [:null] == false sql_type = type_to_sql(type, [:limit], [:precision], [:scale]) sql_type << "[]" if [:array] # Add the column. execute("ALTER TABLE #{quote_table_name(table_name)} ADD COLUMN #{quote_column_name(column_name)} #{sql_type}") change_column_default(table_name, column_name, default) if () change_column_null(table_name, column_name, false, default) if notnull end |
#add_index(table_name, column_name, options = {}) ⇒ Object
unless const_defined? :SchemaCreation
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# File 'lib/arjdbc/postgresql/adapter.rb', line 1129 def add_index(table_name, column_name, = {}) index_name, index_type, index_columns, , index_algorithm, index_using = (table_name, column_name, ) execute "CREATE #{index_type} INDEX #{index_algorithm} #{quote_column_name(index_name)} ON #{quote_table_name(table_name)} #{index_using} (#{index_columns})#{}" end |
#add_order_by_for_association_limiting!(sql, options) ⇒ Object
ORDER BY clause for the passed order option.
PostgreSQL does not allow arbitrary ordering when using DISTINCT ON, so we work around this by wrapping the SQL as a sub-select and ordering in that query.
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# File 'lib/arjdbc/postgresql/adapter.rb', line 840 def add_order_by_for_association_limiting!(sql, ) return sql if [:order].blank? order = [:order].split(',').collect { |s| s.strip }.reject(&:blank?) order.map! { |s| 'DESC' if s =~ /\bdesc$/i } order = order.zip((0...order.size).to_a).map { |s,i| "id_list.alias_#{i} #{s}" }.join(', ') sql.replace "SELECT * FROM (#{sql}) AS id_list ORDER BY #{order}" end |
#all_schemas ⇒ Object
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# File 'lib/arjdbc/postgresql/adapter.rb', line 753 def all_schemas select('SELECT nspname FROM pg_namespace').map { |row| row["nspname"] } end |
#change_column(table_name, column_name, type, options = {}) ⇒ Object
Changes the column of a table.
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# File 'lib/arjdbc/postgresql/adapter.rb', line 1076 def change_column(table_name, column_name, type, = {}) quoted_table_name = quote_table_name(table_name) sql_type = type_to_sql(type, [:limit], [:precision], [:scale]) sql_type << "[]" if [:array] begin execute "ALTER TABLE #{quoted_table_name} ALTER COLUMN #{quote_column_name(column_name)} TYPE #{sql_type}" rescue ActiveRecord::StatementInvalid => e raise e if postgresql_version > 80000 # This is PostgreSQL 7.x, so we have to use a more arcane way of doing it. begin begin_db_transaction tmp_column_name = "#{column_name}_ar_tmp" add_column(table_name, tmp_column_name, type, ) execute "UPDATE #{quoted_table_name} SET #{quote_column_name(tmp_column_name)} = CAST(#{quote_column_name(column_name)} AS #{sql_type})" remove_column(table_name, column_name) rename_column(table_name, tmp_column_name, column_name) commit_db_transaction rescue rollback_db_transaction end end change_column_default(table_name, column_name, [:default]) if () change_column_null(table_name, column_name, [:null], [:default]) if .key?(:null) end |
#change_column_default(table_name, column_name, default) ⇒ Object
Changes the default value of a table column.
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# File 'lib/arjdbc/postgresql/adapter.rb', line 1105 def change_column_default(table_name, column_name, default) if column = column_for(table_name, column_name) # (backwards) compatible with AR 3.x - 4.x execute "ALTER TABLE #{quote_table_name(table_name)} ALTER COLUMN #{quote_column_name(column_name)} SET DEFAULT #{quote_default_value(default, column)}" else execute "ALTER TABLE #{quote_table_name(table_name)} ALTER COLUMN #{quote_column_name(column_name)} SET DEFAULT #{quote(default)}" end end |
#change_column_null(table_name, column_name, null, default = nil) ⇒ Object
unless const_defined? :SchemaCreation
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# File 'lib/arjdbc/postgresql/adapter.rb', line 1113 def change_column_null(table_name, column_name, null, default = nil) unless null || default.nil? if column = column_for(table_name, column_name) # (backwards) compatible with AR 3.x - 4.x execute "UPDATE #{quote_table_name(table_name)} SET #{quote_column_name(column_name)}=#{quote_default_value(default, column)} WHERE #{quote_column_name(column_name)} IS NULL" else execute "UPDATE #{quote_table_name(table_name)} SET #{quote_column_name(column_name)}=#{quote(default)} WHERE #{quote_column_name(column_name)} IS NULL" end end execute("ALTER TABLE #{quote_table_name(table_name)} ALTER #{quote_column_name(column_name)} #{null ? 'DROP' : 'SET'} NOT NULL") end |
#client_min_messages ⇒ Object
Returns the current client message level.
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# File 'lib/arjdbc/postgresql/adapter.rb', line 786 def return nil if redshift? # not supported on Redshift select_value('SHOW client_min_messages', 'SCHEMA') end |
#client_min_messages=(level) ⇒ Object
Set the client message level.
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# File 'lib/arjdbc/postgresql/adapter.rb', line 792 def (level) # NOTE: for now simply ignore the writer (no warn on Redshift) so that # the AR copy-pasted PpstgreSQL parts stay the same as much as possible return nil if redshift? # not supported on Redshift execute("SET client_min_messages TO '#{level}'", 'SCHEMA') end |
#collation ⇒ Object
Returns the current database collation.
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# File 'lib/arjdbc/postgresql/adapter.rb', line 644 def collation select_value( "SELECT pg_database.datcollate" << " FROM pg_database" << " WHERE pg_database.datname LIKE '#{current_database}'", 'SCHEMA') end |
#columns_for_distinct(columns, orders) ⇒ Object
PostgreSQL requires the ORDER BY columns in the select list for distinct queries, and requires that the ORDER BY include the distinct column.
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# File 'lib/arjdbc/postgresql/adapter.rb', line 817 def columns_for_distinct(columns, orders) if orders.is_a?(String) orders = orders.split(','); orders.each(&:strip!) end order_columns = orders.reject(&:blank?).map! do |column| column = column.is_a?(String) ? column.dup : column.to_sql # AREL node column.gsub!(/\s+(?:ASC|DESC)\s*/i, '') # remove any ASC/DESC modifiers column.gsub!(/\s*NULLS\s+(?:FIRST|LAST)?\s*/i, '') column end order_columns.reject!(&:empty?) i = -1; order_columns.map! { |column| "#{column} AS alias_#{i += 1}" } columns = [ columns ]; columns.flatten! columns.push( *order_columns ).join(', ') end |
#configure_connection ⇒ Object
Configures the encoding, verbosity, schema search path, and time zone of the connection.
This is called on connection.connect
and should not be called manually.
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# File 'lib/arjdbc/postgresql/adapter.rb', line 101 def configure_connection #if encoding = config[:encoding] # The client_encoding setting is set by the driver and should not be altered. # If the driver detects a change it will abort the connection. # see http://jdbc.postgresql.org/documentation/91/connect.html # self.set_client_encoding(encoding) #end self. = config[:min_messages] || 'warning' self.schema_search_path = config[:schema_search_path] || config[:schema_order] # Use standard-conforming strings if available so we don't have to do the E'...' dance. set_standard_conforming_strings # If using Active Record's time zone support configure the connection to return # TIMESTAMP WITH ZONE types in UTC. # (SET TIME ZONE does not use an equals sign like other SET variables) if ActiveRecord::Base.default_timezone == :utc execute("SET time zone 'UTC'", 'SCHEMA') elsif tz = local_tz execute("SET time zone '#{tz}'", 'SCHEMA') end unless redshift? # SET statements from :variables config hash # http://www.postgresql.org/docs/8.3/static/sql-set.html (config[:variables] || {}).map do |k, v| if v == ':default' || v == :default # Sets the value to the global or compile default execute("SET SESSION #{k} TO DEFAULT", 'SCHEMA') elsif ! v.nil? execute("SET SESSION #{k} TO #{quote(v)}", 'SCHEMA') end end end |
#create_database(name, options = {}) ⇒ Object
Create a new PostgreSQL database. Options include :owner, :template, :encoding, :collation, :ctype, :tablespace, and :connection_limit (note that MySQL uses :charset while PostgreSQL uses :encoding).
Example: create_database config[:database], config create_database 'foo_development', encoding: 'unicode'
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# File 'lib/arjdbc/postgresql/adapter.rb', line 708 def create_database(name, = {}) = { :encoding => 'utf8' }.merge!(.symbolize_keys) option_string = .sum do |key, value| case key when :owner " OWNER = \"#{value}\"" when :template " TEMPLATE = \"#{value}\"" when :encoding " ENCODING = '#{value}'" when :collation " LC_COLLATE = '#{value}'" when :ctype " LC_CTYPE = '#{value}'" when :tablespace " TABLESPACE = \"#{value}\"" when :connection_limit " CONNECTION LIMIT = #{value}" else "" end end execute "CREATE DATABASE #{quote_table_name(name)}#{option_string}" end |
#create_savepoint(name = current_savepoint_name(true)) ⇒ Object
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# File 'lib/arjdbc/postgresql/adapter.rb', line 390 def create_savepoint(name = current_savepoint_name(true)) log("SAVEPOINT #{name}", 'Savepoint') { super } end |
#create_schema(schema_name, pg_username = nil) ⇒ Object
Creates a schema for the given schema name.
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# File 'lib/arjdbc/postgresql/adapter.rb', line 740 def create_schema(schema_name, pg_username = nil) if pg_username.nil? # AR 4.0 compatibility - accepts only single argument execute "CREATE SCHEMA #{schema_name}" else execute("CREATE SCHEMA \"#{schema_name}\" AUTHORIZATION \"#{pg_username}\"") end end |
#ctype ⇒ Object
Returns the current database ctype.
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# File 'lib/arjdbc/postgresql/adapter.rb', line 653 def ctype select_value( "SELECT pg_database.datctype FROM pg_database WHERE pg_database.datname LIKE '#{current_database}'", 'SCHEMA') end |
#current_database ⇒ Object
current database name
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# File 'lib/arjdbc/postgresql/adapter.rb', line 630 def current_database select_value('SELECT current_database()', 'SCHEMA') end |
#current_schema ⇒ Object
Returns the current schema name.
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# File 'lib/arjdbc/postgresql/adapter.rb', line 625 def current_schema select_value('SELECT current_schema', 'SCHEMA') end |
#default_sequence_name(table_name, pk = nil) ⇒ Object
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# File 'lib/arjdbc/postgresql/adapter.rb', line 452 def default_sequence_name(table_name, pk = nil) default_pk, default_seq = pk_and_sequence_for(table_name) default_seq || "#{table_name}_#{pk || default_pk || 'id'}_seq" end |
#disable_extension(name) ⇒ Object
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# File 'lib/arjdbc/postgresql/adapter.rb', line 412 def disable_extension(name) execute("DROP EXTENSION IF EXISTS \"#{name}\" CASCADE") end |
#disable_referential_integrity ⇒ Object
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# File 'lib/arjdbc/postgresql/adapter.rb', line 1027 def disable_referential_integrity if supports_disable_referential_integrity? begin execute(tables.collect { |name| "ALTER TABLE #{quote_table_name(name)} DISABLE TRIGGER ALL" }.join(";")) rescue execute(tables.collect { |name| "ALTER TABLE #{quote_table_name(name)} DISABLE TRIGGER USER" }.join(";")) end end yield ensure if supports_disable_referential_integrity? begin execute(tables.collect { |name| "ALTER TABLE #{quote_table_name(name)} ENABLE TRIGGER ALL" }.join(";")) rescue execute(tables.collect { |name| "ALTER TABLE #{quote_table_name(name)} ENABLE TRIGGER USER" }.join(";")) end end end |
#distinct(columns, orders) ⇒ Object
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# File 'lib/arjdbc/postgresql/adapter.rb', line 810 def distinct(columns, orders) "DISTINCT #{columns_for_distinct(columns, orders)}" end |
#drop_database(name) ⇒ Object
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# File 'lib/arjdbc/postgresql/adapter.rb', line 735 def drop_database(name) execute "DROP DATABASE IF EXISTS #{quote_table_name(name)}" end |
#drop_schema(schema_name) ⇒ Object
Drops the schema for the given schema name.
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# File 'lib/arjdbc/postgresql/adapter.rb', line 749 def drop_schema schema_name execute "DROP SCHEMA #{schema_name} CASCADE" end |
#enable_extension(name) ⇒ Object
NOTE: only since AR-4.0 but should not hurt on other versions
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# File 'lib/arjdbc/postgresql/adapter.rb', line 408 def enable_extension(name) execute("CREATE EXTENSION IF NOT EXISTS \"#{name}\"") end |
#encoding ⇒ Object
Returns the current database encoding format.
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# File 'lib/arjdbc/postgresql/adapter.rb', line 635 def encoding select_value( "SELECT pg_encoding_to_char(pg_database.encoding)" << " FROM pg_database" << " WHERE pg_database.datname LIKE '#{current_database}'", 'SCHEMA') end |
#escape_bytea(string) ⇒ Object
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# File 'lib/arjdbc/postgresql/adapter.rb', line 967 def escape_bytea(string) return unless string if supports_hex_escaped_bytea? "\\\\x#{string.unpack("H*")[0]}" else result = '' string.each_byte { |c| result << sprintf('\\\\%03o', c) } result end end |
#exec_insert(sql, name, binds, pk = nil, sequence_name = nil) ⇒ Object
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# File 'lib/arjdbc/postgresql/adapter.rb', line 574 def exec_insert(sql, name, binds, pk = nil, sequence_name = nil) # NOTE: 3.2 does not pass the PK on #insert (passed only into #sql_for_insert) : # sql, binds = sql_for_insert(to_sql(arel, binds), pk, id_value, sequence_name, binds) # 3.2 : # value = exec_insert(sql, name, binds) # 4.x : # value = exec_insert(sql, name, binds, pk, sequence_name) if use_insert_returning? && ( pk || (sql.is_a?(String) && sql =~ /RETURNING "?\S+"?$/) ) exec_query(sql, name, binds) # due RETURNING clause returns a result set else result = super if pk unless sequence_name table_ref = extract_table_ref_from_insert_sql(sql) sequence_name = default_sequence_name(table_ref, pk) return result unless sequence_name end last_insert_id_result(sequence_name) else result end end end |
#extension_enabled?(name) ⇒ Boolean
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# File 'lib/arjdbc/postgresql/adapter.rb', line 416 def extension_enabled?(name) if supports_extensions? rows = select_rows("SELECT EXISTS(SELECT * FROM pg_available_extensions WHERE name = '#{name}' AND installed_version IS NOT NULL)", 'SCHEMA') available = rows.first.first # true/false or 't'/'f' available == true || available == 't' end end |
#extensions ⇒ Object
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# File 'lib/arjdbc/postgresql/adapter.rb', line 424 def extensions if supports_extensions? rows = select_rows "SELECT extname from pg_extension", "SCHEMA" rows.map { |row| row.first } else [] end end |
#index_algorithms ⇒ Object
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# File 'lib/arjdbc/postgresql/adapter.rb', line 433 def index_algorithms { :concurrently => 'CONCURRENTLY' } end |
#index_name_exists?(table_name, index_name, default) ⇒ Boolean
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# File 'lib/arjdbc/postgresql/adapter.rb', line 1258 def index_name_exists?(table_name, index_name, default) exec_query(<<-SQL, 'SCHEMA').rows.first[0].to_i > 0 SELECT COUNT(*) FROM pg_class t INNER JOIN pg_index d ON t.oid = d.indrelid INNER JOIN pg_class i ON d.indexrelid = i.oid WHERE i.relkind = 'i' AND i.relname = '#{index_name}' AND t.relname = '#{table_name}' AND i.relnamespace IN (SELECT oid FROM pg_namespace WHERE nspname = ANY (current_schemas(false)) ) SQL end |
#index_name_length ⇒ Object
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# File 'lib/arjdbc/postgresql/adapter.rb', line 1142 def index_name_length 63 end |
#indexes(table_name, name = nil) ⇒ Object
Returns an array of indexes for the given table.
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# File 'lib/arjdbc/postgresql/adapter.rb', line 1272 def indexes(table_name, name = nil) # NOTE: maybe it's better to leave things of to the JDBC API ?! result = select_rows(<<-SQL, 'SCHEMA') SELECT distinct i.relname, d.indisunique, d.indkey, pg_get_indexdef(d.indexrelid), t.oid FROM pg_class t INNER JOIN pg_index d ON t.oid = d.indrelid INNER JOIN pg_class i ON d.indexrelid = i.oid WHERE i.relkind = 'i' AND d.indisprimary = 'f' AND t.relname = '#{table_name}' AND i.relnamespace IN (SELECT oid FROM pg_namespace WHERE nspname = ANY (current_schemas(false)) ) ORDER BY i.relname SQL result.map! do |row| index_name = row[0] unique = row[1].is_a?(String) ? row[1] == 't' : row[1] # JDBC gets us a boolean indkey = row[2].is_a?(Java::OrgPostgresqlUtil::PGobject) ? row[2].value : row[2] indkey = indkey.split(" ") inddef = row[3] oid = row[4] columns = select_rows(<<-SQL, "SCHEMA") SELECT a.attnum, a.attname FROM pg_attribute a WHERE a.attrelid = #{oid} AND a.attnum IN (#{indkey.join(",")}) SQL columns = Hash[ columns.each { |column| column[0] = column[0].to_s } ] column_names = columns.values_at(*indkey).compact unless column_names.empty? # add info on sort order for columns (only desc order is explicitly specified, asc is the default) desc_order_columns = inddef.scan(/(\w+) DESC/).flatten orders = desc_order_columns.any? ? Hash[ desc_order_columns.map { |column| [column, :desc] } ] : {} if ::ActiveRecord::VERSION::MAJOR > 3 # AR4 supports `where` and `using` index options where = inddef.scan(/WHERE (.+)$/).flatten[0] using = inddef.scan(/USING (.+?) /).flatten[0].to_sym IndexDefinition.new(table_name, index_name, unique, column_names, [], orders, where, nil, using) else new_index_definition(table_name, index_name, unique, column_names, [], orders) end end end result.compact! result end |
#insert_sql(sql, name = nil, pk = nil, id_value = nil, sequence_name = nil, binds = []) ⇒ Object
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# File 'lib/arjdbc/postgresql/adapter.rb', line 531 def insert_sql(sql, name = nil, pk = nil, id_value = nil, sequence_name = nil, binds = []) unless pk # Extract the table from the insert sql. Yuck. table_ref = extract_table_ref_from_insert_sql(sql) pk = primary_key(table_ref) if table_ref end if pk && use_insert_returning? # && id_value.nil? select_value("#{to_sql(sql, binds)} RETURNING #{quote_column_name(pk)}") else execute(sql, name, binds) # super unless id_value table_ref ||= extract_table_ref_from_insert_sql(sql) # If neither PK nor sequence name is given, look them up. if table_ref && ! ( pk ||= primary_key(table_ref) ) && ! sequence_name pk, sequence_name = pk_and_sequence_for(table_ref) end # If a PK is given, fallback to default sequence name. # Don't fetch last insert id for a table without a PK. if pk && sequence_name ||= default_sequence_name(table_ref, pk) id_value = last_insert_id(table_ref, sequence_name) end end id_value end end |
#jdbc_column_class ⇒ Object
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# File 'lib/arjdbc/postgresql/adapter.rb', line 31 def jdbc_column_class; ::ActiveRecord::ConnectionAdapters::PostgreSQLColumn end |
#last_insert_id(table, sequence_name = nil) ⇒ Object
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# File 'lib/arjdbc/postgresql/adapter.rb', line 686 def last_insert_id(table, sequence_name = nil) sequence_name = table if sequence_name.nil? # AR-4.0 1 argument last_insert_id_result(sequence_name) end |
#last_insert_id_result(sequence_name) ⇒ Object
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# File 'lib/arjdbc/postgresql/adapter.rb', line 691 def last_insert_id_result(sequence_name) select_value("SELECT currval('#{sequence_name}')", 'SQL') end |
#last_inserted_id(result) ⇒ Integer, NilClass
Take an id from the result of an INSERT query.
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# File 'lib/arjdbc/postgresql/adapter.rb', line 678 def last_inserted_id(result) return nil if result.nil? return result if result.is_a? Integer # <ActiveRecord::Result @hash_rows=nil, @columns=["id"], @rows=[[3]]> # but it will work with [{ 'id' => 1 }] Hash wrapped results as well result.first.first[1] # .first = { "id"=>1 } .first = [ "id", 1 ] end |
#migration_keys ⇒ Object
Adds :array
as a valid migration key.
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# File 'lib/arjdbc/postgresql/adapter.rb', line 300 def migration_keys super + [:array] end |
#multi_column_index_limit ⇒ Object
Gets the maximum number columns postgres has, default 32
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# File 'lib/arjdbc/postgresql/adapter.rb', line 800 def multi_column_index_limit defined?(@multi_column_index_limit) && @multi_column_index_limit || 32 end |
#multi_column_index_limit=(limit) ⇒ Object
Sets the maximum number columns postgres has, default 32
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# File 'lib/arjdbc/postgresql/adapter.rb', line 805 def multi_column_index_limit=(limit) @multi_column_index_limit = limit end |
#native_database_types ⇒ Object
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# File 'lib/arjdbc/postgresql/adapter.rb', line 285 def native_database_types NATIVE_DATABASE_TYPES end |
#pk_and_sequence_for(table) ⇒ Object
Find a table's primary key and sequence.
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# File 'lib/arjdbc/postgresql/adapter.rb', line 473 def pk_and_sequence_for(table) # try looking for a seq with a dependency on the table's primary key : result = select(<<-end_sql, 'PK and Serial Sequence')[0] SELECT attr.attname, seq.relname FROM pg_class seq, pg_attribute attr, pg_depend dep, pg_constraint cons WHERE seq.oid = dep.objid AND seq.relkind = 'S' AND attr.attrelid = dep.refobjid AND attr.attnum = dep.refobjsubid AND attr.attrelid = cons.conrelid AND attr.attnum = cons.conkey[1] AND cons.contype = 'p' AND dep.refobjid = '#{quote_table_name(table)}'::regclass end_sql if result.nil? || result.empty? # if that fails, try parsing the primary key's default value : result = select(<<-end_sql, 'PK and Custom Sequence')[0] SELECT attr.attname, CASE WHEN pg_get_expr(def.adbin, def.adrelid) !~* 'nextval' THEN NULL WHEN split_part(pg_get_expr(def.adbin, def.adrelid), '''', 2) ~ '.' THEN substr(split_part(pg_get_expr(def.adbin, def.adrelid), '''', 2), strpos(split_part(pg_get_expr(def.adbin, def.adrelid), '''', 2), '.')+1) ELSE split_part(pg_get_expr(def.adbin, def.adrelid), '''', 2) END as relname FROM pg_class t JOIN pg_attribute attr ON (t.oid = attrelid) JOIN pg_attrdef def ON (adrelid = attrelid AND adnum = attnum) JOIN pg_constraint cons ON (conrelid = adrelid AND adnum = conkey[1]) WHERE t.oid = '#{quote_table_name(table)}'::regclass AND cons.contype = 'p' AND pg_get_expr(def.adbin, def.adrelid) ~* 'nextval|uuid_generate' end_sql end [ result['attname'], result['relname'] ] rescue nil end |
#postgresql_version ⇒ Object
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# File 'lib/arjdbc/postgresql/adapter.rb', line 60 def postgresql_version @postgresql_version ||= begin version = select_version if version =~ /PostgreSQL (\d+)\.(\d+)\.(\d+)/ ($1.to_i * 10000) + ($2.to_i * 100) + $3.to_i else 0 end end end |
#prepare_column_options(column, types) ⇒ Object
Adds :array
option to the default set provided by the AbstractAdapter
.
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# File 'lib/arjdbc/postgresql/adapter.rb', line 291 def (column, types) spec = super spec[:array] = 'true' if column.respond_to?(:array) && column.array spec[:default] = "\"#{column.default_function}\"" if column.default_function spec end |
#primary_key(table) ⇒ Object
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# File 'lib/arjdbc/postgresql/adapter.rb', line 517 def primary_key(table) result = select(<<-end_sql, 'SCHEMA').first SELECT attr.attname FROM pg_attribute attr INNER JOIN pg_constraint cons ON attr.attrelid = cons.conrelid AND attr.attnum = cons.conkey[1] WHERE cons.contype = 'p' AND cons.conrelid = '#{quote_table_name(table)}'::regclass end_sql result && result['attname'] # pk_and_sequence = pk_and_sequence_for(table) # pk_and_sequence && pk_and_sequence.first end |
#quote(value, column = nil) ⇒ String
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# File 'lib/arjdbc/postgresql/adapter.rb', line 852 def quote(value, column = nil) return super unless column && column.type return value if sql_literal?(value) case value when Float if value.infinite? && ( column.type == :datetime || column.type == :timestamp ) "'#{value.to_s.downcase}'" elsif value.infinite? || value.nan? "'#{value.to_s}'" else super end when Numeric if column.respond_to?(:sql_type) && column.sql_type == 'money' "'#{value}'" elsif column.type == :string || column.type == :text "'#{value}'" else super end when String return "E'#{escape_bytea(value)}'::bytea" if column.type == :binary return "xml '#{quote_string(value)}'" if column.type == :xml sql_type = column.respond_to?(:sql_type) && column.sql_type sql_type && sql_type[0, 3] == 'bit' ? quote_bit(value) : super when Array if AR4_COMPAT && column.array? # will be always falsy in AR < 4.0 "'#{jdbc_column_class.array_to_string(value, column, self).gsub(/'/, "''")}'" elsif column.type == :json # only in AR-4.0 super(jdbc_column_class.json_to_string(value), column) elsif column.type == :jsonb # only in AR-4.0 super(jdbc_column_class.json_to_string(value), column) elsif column.type == :point # only in AR-4.0 super(jdbc_column_class.point_to_string(value), column) else super end when Hash if column.type == :hstore # only in AR-4.0 super(jdbc_column_class.hstore_to_string(value), column) elsif column.type == :json # only in AR-4.0 super(jdbc_column_class.json_to_string(value), column) elsif column.type == :jsonb # only in AR-4.0 super(jdbc_column_class.json_to_string(value), column) else super end when Range sql_type = column.respond_to?(:sql_type) && column.sql_type if sql_type && sql_type[-5, 5] == 'range' && AR4_COMPAT escaped = quote_string(jdbc_column_class.range_to_string(value)) "'#{escaped}'::#{sql_type}" else super end when IPAddr if column.type == :inet || column.type == :cidr # only in AR-4.0 super(jdbc_column_class.cidr_to_string(value), column) else super end else super end end |
#quote_bit(value) ⇒ String
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# File 'lib/arjdbc/postgresql/adapter.rb', line 950 def quote_bit(value) case value # NOTE: as reported with #60 this is not quite "right" : # "0103" will be treated as hexadecimal string # "0102" will be treated as hexadecimal string # "0101" will be treated as binary string # "0100" will be treated as binary string # ... but is kept due Rails compatibility when /\A[01]*\Z/ then "B'#{value}'" # Bit-string notation when /\A[0-9A-F]*\Z/i then "X'#{value}'" # Hexadecimal notation end end |
#quote_column_name(name) ⇒ Object
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# File 'lib/arjdbc/postgresql/adapter.rb', line 996 def quote_column_name(name) %("#{name.to_s.gsub("\"", "\"\"")}") end |
#quote_string(string) ⇒ String
Quotes a string, escaping any ' (single quote) and \ (backslash) chars.
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# File 'lib/arjdbc/postgresql/adapter.rb', line 941 def quote_string(string) quoted = string.gsub("'", "''") unless standard_conforming_strings? quoted.gsub!(/\\/, '\&\&') end quoted end |
#quote_table_name(name) ⇒ Object
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# File 'lib/arjdbc/postgresql/adapter.rb', line 979 def quote_table_name(name) schema, name_part = extract_pg_identifier_from_name(name.to_s) unless name_part quote_column_name(schema) else table_name, name_part = extract_pg_identifier_from_name(name_part) "#{quote_column_name(schema)}.#{quote_column_name(table_name)}" end end |
#quote_table_name_for_assignment(table, attr) ⇒ Object
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# File 'lib/arjdbc/postgresql/adapter.rb', line 991 def quote_table_name_for_assignment(table, attr) quote_column_name(attr) end |
#quoted_date(value) ⇒ Object
Quote date/time values for use in SQL input.
Includes microseconds if the value is a Time responding to usec
.
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# File 'lib/arjdbc/postgresql/adapter.rb', line 1013 def quoted_date(value) result = super if value.acts_like?(:time) && value.respond_to?(:usec) result = "#{result}.#{sprintf("%06d", value.usec)}" end result = "#{result.sub(/^-/, '')} BC" if value.year < 0 result end |
#recreate_database(name, options = {}) ⇒ Object
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# File 'lib/arjdbc/postgresql/adapter.rb', line 695 def recreate_database(name, = {}) drop_database(name) create_database(name, ) end |
#release_savepoint(name = current_savepoint_name) ⇒ Object
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# File 'lib/arjdbc/postgresql/adapter.rb', line 400 def release_savepoint(name = current_savepoint_name) log("RELEASE SAVEPOINT #{name}", 'Savepoint') { super } end |
#remove_index!(table_name, index_name) ⇒ Object
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# File 'lib/arjdbc/postgresql/adapter.rb', line 1134 def remove_index!(table_name, index_name) execute "DROP INDEX #{quote_table_name(index_name)}" end |
#rename_column(table_name, column_name, new_column_name) ⇒ Object
unless const_defined? :SchemaCreation
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# File 'lib/arjdbc/postgresql/adapter.rb', line 1124 def rename_column(table_name, column_name, new_column_name) execute "ALTER TABLE #{quote_table_name(table_name)} RENAME COLUMN #{quote_column_name(column_name)} TO #{quote_column_name(new_column_name)}" rename_column_indexes(table_name, column_name, new_column_name) if respond_to?(:rename_column_indexes) # AR-4.0 SchemaStatements end |
#rename_index(table_name, old_name, new_name) ⇒ Object
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# File 'lib/arjdbc/postgresql/adapter.rb', line 1138 def rename_index(table_name, old_name, new_name) execute "ALTER INDEX #{quote_column_name(old_name)} RENAME TO #{quote_table_name(new_name)}" end |
#rename_table(table_name, new_name) ⇒ Object
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# File 'lib/arjdbc/postgresql/adapter.rb', line 1046 def rename_table(table_name, new_name) execute "ALTER TABLE #{quote_table_name(table_name)} RENAME TO #{quote_table_name(new_name)}" pk, seq = pk_and_sequence_for(new_name) if seq == "#{table_name}_#{pk}_seq" new_seq = "#{new_name}_#{pk}_seq" idx = "#{table_name}_pkey" new_idx = "#{new_name}_pkey" execute "ALTER TABLE #{quote_table_name(seq)} RENAME TO #{quote_table_name(new_seq)}" execute "ALTER INDEX #{quote_table_name(idx)} RENAME TO #{quote_table_name(new_idx)}" end rename_table_indexes(table_name, new_name) if respond_to?(:rename_table_indexes) # AR-4.0 SchemaStatements end |
#reset_pk_sequence!(table, pk = nil, sequence = nil) ⇒ Object
Resets sequence to the max value of the table's primary key if present.
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# File 'lib/arjdbc/postgresql/adapter.rb', line 458 def reset_pk_sequence!(table, pk = nil, sequence = nil) if ! pk || ! sequence default_pk, default_sequence = pk_and_sequence_for(table) pk ||= default_pk; sequence ||= default_sequence end if pk && sequence quoted_sequence = quote_column_name(sequence) select_value <<-end_sql, 'Reset Sequence' SELECT setval('#{quoted_sequence}', (SELECT COALESCE(MAX(#{quote_column_name pk})+(SELECT increment_by FROM #{quoted_sequence}), (SELECT min_value FROM #{quoted_sequence})) FROM #{quote_table_name(table)}), false) end_sql end end |
#rollback_to_savepoint(name = current_savepoint_name) ⇒ Object
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# File 'lib/arjdbc/postgresql/adapter.rb', line 395 def rollback_to_savepoint(name = current_savepoint_name) log("ROLLBACK TO SAVEPOINT #{name}", 'Savepoint') { super } end |
#schema_creation ⇒ Object
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# File 'lib/arjdbc/postgresql/schema_creation.rb', line 37 def schema_creation SchemaCreation.new self end |
#schema_exists?(name) ⇒ Boolean
Returns true if schema exists.
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# File 'lib/arjdbc/postgresql/adapter.rb', line 620 def schema_exists?(name) select_value("SELECT COUNT(*) FROM pg_namespace WHERE nspname = '#{name}'", 'SCHEMA').to_i > 0 end |
#schema_names ⇒ Object
Returns an array of schema names.
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# File 'lib/arjdbc/postgresql/adapter.rb', line 611 def schema_names select_values( "SELECT nspname FROM pg_namespace" << " WHERE nspname !~ '^pg_.*' AND nspname NOT IN ('information_schema')" << " ORDER by nspname;", 'SCHEMA') end |
#schema_search_path ⇒ Object
Returns the active schema search path.
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# File 'lib/arjdbc/postgresql/adapter.rb', line 660 def schema_search_path @schema_search_path ||= select_value('SHOW search_path', 'SCHEMA') end |
#schema_search_path=(schema_csv) ⇒ Object
Sets the schema search path to a string of comma-separated schema names. Names beginning with $ have to be quoted (e.g. $user => '$user'). See: http://www.postgresql.org/docs/current/static/ddl-schemas.html
This should be not be called manually but set in database.yml.
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# File 'lib/arjdbc/postgresql/adapter.rb', line 669 def schema_search_path=(schema_csv) if schema_csv execute "SET search_path TO #{schema_csv}" @schema_search_path = schema_csv end end |
#session_auth=(user) ⇒ Object
Set the authorized user for this session.
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# File 'lib/arjdbc/postgresql/adapter.rb', line 438 def session_auth=(user) execute "SET SESSION AUTHORIZATION #{user}" end |
#set_client_encoding(encoding) ⇒ Object
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# File 'lib/arjdbc/postgresql/adapter.rb', line 94 def set_client_encoding(encoding) ActiveRecord::Base.logger.warn "client_encoding is set by the driver and should not be altered, ('#{encoding}' ignored)" ActiveRecord::Base.logger.debug "Set the 'allowEncodingChanges' driver property (e.g. using config[:properties]) if you need to override the client encoding when doing a copy." end |
#set_standard_conforming_strings ⇒ Object
Enable standard-conforming strings if available.
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# File 'lib/arjdbc/postgresql/adapter.rb', line 305 def set_standard_conforming_strings self.standard_conforming_strings=(true) end |
#sql_for_insert(sql, pk, id_value, sequence_name, binds) ⇒ Object
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# File 'lib/arjdbc/postgresql/adapter.rb', line 559 def sql_for_insert(sql, pk, id_value, sequence_name, binds) unless pk # Extract the table from the insert sql. Yuck. table_ref = extract_table_ref_from_insert_sql(sql) pk = primary_key(table_ref) if table_ref end if pk && use_insert_returning? sql = "#{sql} RETURNING #{quote_column_name(pk)}" end [ sql, binds ] end |
#standard_conforming_strings=(enable) ⇒ Object
Enable standard-conforming strings if available.
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# File 'lib/arjdbc/postgresql/adapter.rb', line 310 def standard_conforming_strings=(enable) = self. begin self. = 'panic' value = enable ? "on" : "off" execute("SET standard_conforming_strings = #{value}", 'SCHEMA') @standard_conforming_strings = ( value == "on" ) rescue @standard_conforming_strings = :unsupported ensure self. = end end |
#standard_conforming_strings? ⇒ Boolean
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# File 'lib/arjdbc/postgresql/adapter.rb', line 324 def standard_conforming_strings? if @standard_conforming_strings.nil? = self. begin self. = 'panic' value = select_one('SHOW standard_conforming_strings', 'SCHEMA')['standard_conforming_strings'] @standard_conforming_strings = ( value == "on" ) rescue @standard_conforming_strings = :unsupported ensure self. = end end @standard_conforming_strings == true # return false if :unsupported end |
#structure_dump ⇒ Object
no longer used - handled with (AR built-in) Rake tasks
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# File 'lib/arjdbc/postgresql/adapter.rb', line 758 def structure_dump database = @config[:database] if database.nil? if @config[:url] =~ /\/([^\/]*)$/ database = $1 else raise "Could not figure out what database this url is for #{@config["url"]}" end end ENV['PGHOST'] = @config[:host] if @config[:host] ENV['PGPORT'] = @config[:port].to_s if @config[:port] ENV['PGPASSWORD'] = @config[:password].to_s if @config[:password] search_path = "--schema=#{@config[:schema_search_path]}" if @config[:schema_search_path] @connection.connection.close begin definition = `pg_dump -i -U "#{@config[:username]}" -s -x -O #{search_path} #{database}` raise "Error dumping database" if $?.exitstatus == 1 # need to patch away any references to SQL_ASCII as it breaks the JDBC driver definition.gsub(/SQL_ASCII/, 'UNICODE') ensure reconnect! end end |
#supports_ddl_transactions? ⇒ Boolean
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# File 'lib/arjdbc/postgresql/adapter.rb', line 364 def supports_ddl_transactions?; true end |
#supports_disable_referential_integrity? ⇒ Boolean
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# File 'lib/arjdbc/postgresql/adapter.rb', line 1023 def supports_disable_referential_integrity? true end |
#supports_extensions? ⇒ Boolean
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# File 'lib/arjdbc/postgresql/adapter.rb', line 404 def supports_extensions? postgresql_version >= 90200 end |
#supports_hex_escaped_bytea? ⇒ Boolean
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# File 'lib/arjdbc/postgresql/adapter.rb', line 356 def supports_hex_escaped_bytea? postgresql_version >= 90000 end |
#supports_index_sort_order? ⇒ Boolean
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# File 'lib/arjdbc/postgresql/adapter.rb', line 368 def supports_index_sort_order?; true end |
#supports_insert_with_returning? ⇒ Boolean
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# File 'lib/arjdbc/postgresql/adapter.rb', line 360 def supports_insert_with_returning? postgresql_version >= 80200 end |
#supports_migrations? ⇒ Boolean
Does PostgreSQL support migrations?
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# File 'lib/arjdbc/postgresql/adapter.rb', line 341 def supports_migrations? true end |
#supports_partial_index? ⇒ Boolean
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# File 'lib/arjdbc/postgresql/adapter.rb', line 370 def supports_partial_index?; true end |
#supports_primary_key? ⇒ Boolean
Does PostgreSQL support finding primary key on non-Active Record tables?
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# File 'lib/arjdbc/postgresql/adapter.rb', line 346 def supports_primary_key? true end |
#supports_ranges? ⇒ Boolean
Range data-types weren't introduced until PostgreSQL 9.2.
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# File 'lib/arjdbc/postgresql/adapter.rb', line 373 def supports_ranges? postgresql_version >= 90200 end |
#supports_savepoints? ⇒ Boolean
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# File 'lib/arjdbc/postgresql/adapter.rb', line 387 def supports_savepoints?; true end |
#supports_standard_conforming_strings? ⇒ Boolean
Does PostgreSQL support standard conforming strings?
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# File 'lib/arjdbc/postgresql/adapter.rb', line 351 def supports_standard_conforming_strings? standard_conforming_strings? @standard_conforming_strings != :unsupported end |
#supports_transaction_isolation?(level = nil) ⇒ Boolean
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# File 'lib/arjdbc/postgresql/adapter.rb', line 366 def supports_transaction_isolation?; true end |
#supports_views? ⇒ Boolean
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# File 'lib/arjdbc/postgresql/adapter.rb', line 382 def supports_views?; true end |
#table_alias_length ⇒ Object
Returns the configured supported identifier length supported by PostgreSQL, or report the default of 63 on PostgreSQL 7.x.
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# File 'lib/arjdbc/postgresql/adapter.rb', line 444 def table_alias_length @table_alias_length ||= ( postgresql_version >= 80000 ? select_one('SHOW max_identifier_length')['max_identifier_length'].to_i : 63 ) end |
#table_exists?(name) ⇒ Boolean
Returns true if table exists. If the schema is not specified as part of +name+ then it will only find tables within the current schema search path (regardless of permissions to access tables in other schemas)
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# File 'lib/arjdbc/postgresql/adapter.rb', line 1240 def table_exists?(name) schema, table = extract_schema_and_table(name.to_s) return false unless table binds = [[nil, table]] binds << [nil, schema] if schema sql = "#{TABLE_EXISTS_SQL_PREFIX} AND n.nspname = #{schema ? "?" : 'ANY (current_schemas(false))'}" log(sql, 'SCHEMA', binds) do @connection.execute_query_raw(sql, binds).first['table_count'] > 0 end end |
#tables(name = nil) ⇒ Object
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# File 'lib/arjdbc/postgresql/adapter.rb', line 1223 def tables(name = nil) select_values(TABLES_SQL, 'SCHEMA') end |
#truncate(table_name, name = nil) ⇒ Object
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# File 'lib/arjdbc/postgresql/adapter.rb', line 1254 def truncate(table_name, name = nil) execute "TRUNCATE TABLE #{quote_table_name(table_name)}", name end |
#type_cast(value, column, array_member = false) ⇒ Object
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# File 'lib/arjdbc/postgresql/adapter.rb', line 176 def type_cast(value, column, array_member = false) return super(value, nil) unless column case value when String return super(value, column) unless 'bytea' == column.sql_type value # { :value => value, :format => 1 } when Array case column.sql_type when 'point' jdbc_column_class.point_to_string(value) when 'json', 'jsonb' jdbc_column_class.json_to_string(value) else return super(value, column) unless column.array? jdbc_column_class.array_to_string(value, column, self) end when NilClass if column.array? && array_member 'NULL' elsif column.array? value else super(value, column) end when Hash case column.sql_type when 'hstore' jdbc_column_class.hstore_to_string(value) when 'json', 'jsonb' jdbc_column_class.json_to_string(value) else super(value, column) end when IPAddr return super unless column.sql_type == 'inet' || column.sql_type == 'cidr' jdbc_column_class.cidr_to_string(value) when Range return super(value, column) unless /range$/ =~ column.sql_type jdbc_column_class.range_to_string(value) else super(value, column) end end |
#type_to_sql(type, limit = nil, precision = nil, scale = nil) ⇒ Object
Maps logical Rails types to PostgreSQL-specific data types.
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# File 'lib/arjdbc/postgresql/adapter.rb', line 139 def type_to_sql(type, limit = nil, precision = nil, scale = nil) case type.to_sym when :'binary' # PostgreSQL doesn't support limits on binary (bytea) columns. # The hard limit is 1Gb, because of a 32-bit size field, and TOAST. case limit when nil, 0..0x3fffffff; super(type, nil, nil, nil) else raise(ActiveRecordError, "No binary type has byte size #{limit}.") end when :'text' # PostgreSQL doesn't support limits on text columns. # The hard limit is 1Gb, according to section 8.3 in the manual. case limit when nil, 0..0x3fffffff; super(type, nil, nil, nil) else raise(ActiveRecordError, "The limit on text can be at most 1GB - 1byte.") end when :'integer' return 'integer' unless limit case limit when 1, 2; 'smallint' when 3, 4; 'integer' when 5..8; 'bigint' else raise(ActiveRecordError, "No integer type has byte size #{limit}. Use a numeric with precision 0 instead.") end when :'datetime' return super unless precision case precision when 0..6; "timestamp(#{precision})" else raise(ActiveRecordError, "No timestamp type has precision of #{precision}. The allowed range of precision is from 0 to 6") end else super end end |
#use_insert_returning? ⇒ Boolean
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# File 'lib/arjdbc/postgresql/adapter.rb', line 87 def use_insert_returning? if @use_insert_returning.nil? @use_insert_returning = supports_insert_with_returning? end @use_insert_returning end |