Class: Spider::Model::Storage::Db::DbStorage
- Inherits:
-
BaseStorage
- Object
- BaseStorage
- Spider::Model::Storage::Db::DbStorage
- Defined in:
- lib/spiderfw/model/storage/db/db_storage.rb
Overview
Represents a DB connection, and provides methods to execute structured queries on it. This is the class that generates the actual SQL; vendor specific extensions may override the generic SQL methods.
Class Attribute Summary collapse
-
.reserved_keywords ⇒ Object
readonly
An Array of keywords that can not be used in schema names.
-
.safe_conversions ⇒ Object
readonly
Type conversions which do not lose data.
-
.type_synonyms ⇒ Object
readonly
An Hash of DB type equivalents.
Attributes inherited from BaseStorage
Class Method Summary collapse
Instance Method Summary collapse
-
#alter_table(alter) ⇒ Object
Executes an alter table structured description.
-
#column_attributes(type, attributes) ⇒ Object
Returns the attributes corresponding to element type and attributes.
-
#column_name(name) ⇒ Object
Fixes a string to be used as a column name.
-
#column_type(type, attributes) ⇒ Object
Returns the db type corresponding to an element type.
-
#create_table(create) ⇒ Object
Executes a create table structured description.
-
#describe_table(table) ⇒ Object
Returns a description of the table as currently present in the DB.
-
#drop_field(table_name, field_name) ⇒ Object
Drops a field from the DB.
-
#drop_table(table_name) ⇒ Object
Drops a table from the DB.
- #dump(stream, tables = nil, options = {}) ⇒ Object
- #foreign_key_name(name) ⇒ Object
-
#function(func) ⇒ Object
Returns the SQL for a QueryFuncs::Function.
-
#get_mapper(model) ⇒ Object
Returns the default mapper for the storage.
-
#initialize(url) ⇒ DbStorage
constructor
The constructor takes the connection URL, which will be parsed into connection params.
-
#list_tables ⇒ Object
Returns an array of the table names currently in the DB.
- #lock(table, mode = :exclusive) ⇒ Object
-
#parse_db_column(col) ⇒ Object
Post processes column information retrieved from current DB.
-
#prepare_value(type, value) ⇒ Object
Prepares a value that will be used on the DB.
-
#query(query) ⇒ Object
Executes a select query (given in struct form).
- #query_finished ⇒ Object
- #query_start ⇒ Object
- #reflect_column(table, column_name, column_attributes) ⇒ Object
-
#safe_schema_conversion?(current, field) ⇒ Boolean
Checks if the conversion from a current DB field to a schema field is safe, i.e.
-
#schema_field_equal?(current, field) ⇒ Boolean
Checks if a DB field is equal to a schema field.
-
#sequence_name(name) ⇒ Object
Fixes a string to be used as a sequence name.
-
#shorten_identifier(name, length) ⇒ Object
Shortens a DB name up to length.
-
#sql_add_field(table_name, name, type, attributes) ⇒ Object
Returns an array of SQL statements to add a field.
-
#sql_alter_field(table_name, name, type, attributes) ⇒ Object
Returns an array of SQL statements to alter a field.
-
#sql_alter_table(alter) ⇒ Object
Returns an array of SQL statements for an alter structured description.
-
#sql_condition(query) ⇒ Object
Returns SQL and bound variables for a condition.
-
#sql_condition_value(key, comp, value, bound_vars = true) ⇒ Object
Returns the SQL for a condition comparison.
- #sql_create_primary_key(table_name, fields) ⇒ Object
-
#sql_create_table(create) ⇒ Object
Returns an array of SQL statements for a create structured description.
-
#sql_delete(delete, force = false) ⇒ Object
Returns SQL and bound values for a DELETE statement.
-
#sql_drop_field(table_name, field_name) ⇒ Object
Returns an array of SQL statements to drop a field.
- #sql_drop_foreign_key(table_name, key_name) ⇒ Object
- #sql_drop_primary_key(table_name) ⇒ Object
-
#sql_drop_table(table_name) ⇒ Object
Returns an array of SQL statements needed to drop a table.
-
#sql_insert(insert) ⇒ Object
Returns SQL and values for an insert statement.
-
#sql_joins(joins) ⇒ Object
Returns SQL and values for DB joins.
-
#sql_keys(query) ⇒ Object
Returns the SQL for select keys.
-
#sql_limit(query) ⇒ Object
Returns the LIMIT and OFFSET SQL.
-
#sql_max(max) ⇒ Object
Aggregates #.
-
#sql_order(query, replacements = {}) ⇒ Object
Returns SQL for the ORDER part.
-
#sql_select(query) ⇒ Object
Returns a two element array, containing the SQL for given select query, and the variables to bind.
-
#sql_table_field(name, type, attributes) ⇒ Object
Returns the SQL for a field definition (used in create and alter table).
-
#sql_tables(query) ⇒ Object
Returns an array containing the ‘FROM’ part of an SQL query (including joins), and the bound variables, if any.
-
#sql_tables_join(query, table) ⇒ Object
Returns SQL and bound variables for joins.
- #sql_truncate(table) ⇒ Object
-
#sql_update(update) ⇒ Object
Returns SQL and values for an update statement.
-
#sql_update_values(update) ⇒ Object
Returns the COLUMN = val, …
-
#table_name(name) ⇒ Object
Fixes a string to be used as a table name.
- #total_rows ⇒ Object
-
#value_to_mapper(type, value) ⇒ Object
Converts a value loaded from the DB to return it to the mapper.
Methods inherited from BaseStorage
#==, base_types, #commit, #commit!, #commit_or_continue, #configure, #connect, #connected?, #connection, connection_alive?, #connection_attributes, connection_attributes, #connection_pool, connection_pools, #create_sequence, #curr, disconnect, #do_commit, #do_rollback, #do_start_transaction, #generate_uuid, get_connection, #in_transaction, #in_transaction?, max_connections, new_connection, #parse_url, #release, release_connection, remove_connection, #rollback, #rollback!, #rollback_savepoint, #savepoint, #sequence_exists?, #sequence_file_path, #sequence_next, sequence_sync, #start_transaction, #supports?, supports?, #supports_transactions?, #transactions_enabled?, #update_sequence, #value_for_condition, #value_for_save
Methods included from Logger
add, close, close_all, datetime_format, datetime_format=, #debug, debug, debug?, #debug?, enquire_loggers, #error, error, #error?, error?, #fatal, fatal, #fatal?, fatal?, info, #info, info?, #info?, method_missing, open, reopen, send_to_loggers, unknown, #unknown, #warn, warn, warn?, #warn?
Constructor Details
#initialize(url) ⇒ DbStorage
The constructor takes the connection URL, which will be parsed into connection params.
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# File 'lib/spiderfw/model/storage/db/db_storage.rb', line 62 def initialize(url) super end |
Class Attribute Details
.reserved_keywords ⇒ Object (readonly)
An Array of keywords that can not be used in schema names.
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# File 'lib/spiderfw/model/storage/db/db_storage.rb', line 28 def reserved_keywords @reserved_keywords end |
.safe_conversions ⇒ Object (readonly)
Type conversions which do not lose data. See also #safe_schema_conversion?
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# File 'lib/spiderfw/model/storage/db/db_storage.rb', line 32 def safe_conversions @safe_conversions end |
.type_synonyms ⇒ Object (readonly)
An Hash of DB type equivalents.
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# File 'lib/spiderfw/model/storage/db/db_storage.rb', line 30 def type_synonyms @type_synonyms end |
Class Method Details
.inherited(subclass) ⇒ Object
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# File 'lib/spiderfw/model/storage/db/db_storage.rb', line 39 def inherited(subclass) subclass.instance_variable_set("@reserved_keywords", @reserved_keywords) subclass.instance_variable_set("@type_synonyms", @type_synonyms) subclass.instance_variable_set("@safe_conversions", @safe_conversions) super end |
.storage_type ⇒ Object
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# File 'lib/spiderfw/model/storage/db/db_storage.rb', line 35 def storage_type :db end |
Instance Method Details
#alter_table(alter) ⇒ Object
Executes an alter table structured description.
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# File 'lib/spiderfw/model/storage/db/db_storage.rb', line 539 def alter_table(alter) sqls = sql_alter_table(alter) sqls.each do |sql| execute(sql) end end |
#column_attributes(type, attributes) ⇒ Object
Returns the attributes corresponding to element type and attributes
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# File 'lib/spiderfw/model/storage/db/db_storage.rb', line 139 def column_attributes(type, attributes) db_attributes = {} case type.name when 'Spider::DataTypes::PK' db_attributes[:autoincrement] = true if supports?(:autoincrement) db_attributes[:length] = 11 when 'String', 'Spider::DataTypes::Text' db_attributes[:length] = attributes[:length] if (attributes[:length]) when 'Float' db_attributes[:length] = attributes[:length] if (attributes[:length]) db_attributes[:precision] = attributes[:precision] if (attributes[:precision]) when 'BigDecimal' db_attributes[:precision] = attributes[:precision] || 65 db_attributes[:scale] = attributes[:scale] || 2 when 'Spider::DataTypes::Binary' db_attributes[:length] = attributes[:length] if (attributes[:length]) when 'Spider::DataTypes::Bool' db_attributes[:length] = 1 end db_attributes[:autoincrement] = attributes[:autoincrement] if supports?(:autoincrement) return db_attributes end |
#column_name(name) ⇒ Object
Fixes a string to be used as a column name.
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# File 'lib/spiderfw/model/storage/db/db_storage.rb', line 105 def column_name(name) name = name.to_s name += '_field' if (self.class.reserved_keywords.include?(name.downcase)) return name end |
#column_type(type, attributes) ⇒ Object
Returns the db type corresponding to an element type.
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# File 'lib/spiderfw/model/storage/db/db_storage.rb', line 117 def column_type(type, attributes) case type.name when 'String' 'TEXT' when 'Text' 'LONGTEXT' when 'Fixnum' 'INT' when 'Float' 'REAL' when 'BigDecimal', 'Spider::DataTypes::Decimal' 'DECIMAL' when 'Date', 'DateTime', 'Time' 'DATE' when 'Spider::DataTypes::Binary' 'BLOB' when 'Spider::DataTypes::Bool' 'INT' end end |
#create_table(create) ⇒ Object
Executes a create table structured description.
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# File 'lib/spiderfw/model/storage/db/db_storage.rb', line 531 def create_table(create) sqls = sql_create_table(create) sqls.each do |sql| execute(sql) end end |
#describe_table(table) ⇒ Object
Returns a description of the table as currently present in the DB.
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# File 'lib/spiderfw/model/storage/db/db_storage.rb', line 665 def describe_table(table) raise "Unimplemented" end |
#drop_field(table_name, field_name) ⇒ Object
Drops a field from the DB.
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# File 'lib/spiderfw/model/storage/db/db_storage.rb', line 547 def drop_field(table_name, field_name) sqls = sql_drop_field(table_name, field_name) sqls.each{ |sql| execute(sql) } end |
#drop_table(table_name) ⇒ Object
Drops a table from the DB.
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# File 'lib/spiderfw/model/storage/db/db_storage.rb', line 553 def drop_table(table_name) sqls = sql_drop_table(table_name) sqls.each{ |sql| execute(sql) } end |
#dump(stream, tables = nil, options = {}) ⇒ Object
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# File 'lib/spiderfw/model/storage/db/db_storage.rb', line 674 def dump(stream, tables=nil, ={}) tables ||= list_tables = ({ :include_create => true }).merge() tables.each do |t| Spider.logger.info("Dumping table #{t}") begin if [:include_create] create = get_table_create_sql(t) stream << create stream << "\n\n" end dump_table_data(t, stream) stream << "\n\n" rescue => exc Spider.logger.error("Failed to dump table #{t}") Spider.logger.error(exc.) end end end |
#foreign_key_name(name) ⇒ Object
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# File 'lib/spiderfw/model/storage/db/db_storage.rb', line 111 def foreign_key_name(name) name end |
#function(func) ⇒ Object
Returns the SQL for a QueryFuncs::Function
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# File 'lib/spiderfw/model/storage/db/db_storage.rb', line 163 def function(func) fields = func.elements.map{ |func_el| if (func_el.is_a?(Spider::QueryFuncs::Function)) function(func_el) else func.mapper_fields[func_el] end } case func.func_name when :length return "LENGTH(#{fields.join(', ')})" when :trim return "TRIM(#{fields.join(', ')})" when :concat return "CONCAT(#{fields.join(', ')})" when :substr arguments = "#{func.start}" arguments += ", #{func.length}" if func.length return "SUBSTR(#{fields.join(', ')}, #{arguments})" when :subtract return "(#{fields[0]} - #{fields[1]})" when :rownum return "ROWNUM()" end raise NotImplementedError, "#{self.class} does not support function #{func.func_name}" end |
#get_mapper(model) ⇒ Object
Returns the default mapper for the storage. If the storage subclass contains a MapperExtension module, it will be mixed-in with the mapper.
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# File 'lib/spiderfw/model/storage/db/db_storage.rb', line 69 def get_mapper(model) mapper = Spider::Model::Mappers::DbMapper.new(model, self) if (self.class.const_defined?(:MapperExtension)) mapper.extend(self.class.const_get(:MapperExtension)) end return mapper end |
#list_tables ⇒ Object
Returns an array of the table names currently in the DB.
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# File 'lib/spiderfw/model/storage/db/db_storage.rb', line 660 def list_tables raise "Unimplemented" end |
#lock(table, mode = :exclusive) ⇒ Object
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# File 'lib/spiderfw/model/storage/db/db_storage.rb', line 78 def lock(table, mode=:exclusive) lockmode = case(mode) when :shared 'SHARE' when :row_exclusive 'ROW EXCLUSIVE' else 'EXCLUSIVE' end execute("LOCK TABLE #{table} IN #{lockmode} MODE") end |
#parse_db_column(col) ⇒ Object
Post processes column information retrieved from current DB.
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# File 'lib/spiderfw/model/storage/db/db_storage.rb', line 670 def parse_db_column(col) col end |
#prepare_value(type, value) ⇒ Object
Prepares a value that will be used on the DB.
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# File 'lib/spiderfw/model/storage/db/db_storage.rb', line 211 def prepare_value(type, value) case type.name when 'String', 'Spider::DataTypes::Text' enc = @configuration['encoding'] if (enc && enc.downcase != 'utf-8') begin value = Iconv.conv(enc+'//IGNORE', 'utf-8', value.to_s+' ')[0..-2] rescue Iconv::InvalidCharacter value = '' end end when 'BigDecimal' value = value.to_f if value end return value end |
#query(query) ⇒ Object
Executes a select query (given in struct form).
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# File 'lib/spiderfw/model/storage/db/db_storage.rb', line 229 def query(query) curr[:last_query] = query case query[:query_type] when :select sql, bind_vars = sql_select(query) execute(sql, *bind_vars) when :count query[:keys] = ['COUNT(*) AS N'] sql, bind_vars = sql_select(query) return execute(sql, *bind_vars)[0]['N'].to_i end end |
#query_finished ⇒ Object
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# File 'lib/spiderfw/model/storage/db/db_storage.rb', line 52 def query_finished return unless curr[:query_start] # happens if there was no db connection now = Time.now diff = now - curr[:query_start] diff = 0 if diff < 0 # ??? diff = diff*1000 Spider.logger.info("Db query (#{@instance_name}) done in #{diff}ms") end |
#query_start ⇒ Object
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# File 'lib/spiderfw/model/storage/db/db_storage.rb', line 48 def query_start curr[:query_start] = Time.now end |
#reflect_column(table, column_name, column_attributes) ⇒ Object
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# File 'lib/spiderfw/model/storage/db/db_storage.rb', line 718 def reflect_column(table, column_name, column_attributes) column_type = column_attributes[:type] el_type = nil el_attributes = {} case column_type when 'TEXT' el_type = String when 'LONGTEXT' el_type = Text when 'INT' if (column_attributes[:length] == 1) el_type = Spider::DataTypes::Bool else el_type = Fixnum end when 'REAL' el_type = Float when 'DECIMAL' el_type = BigDecimal when 'DATE' el_type = DateTime when 'BLOB' el_type = Spider::DataTypes::Binary end return el_type, el_attributes end |
#safe_schema_conversion?(current, field) ⇒ Boolean
Checks if the conversion from a current DB field to a schema field is safe, i.e. can be done without loss of data.
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# File 'lib/spiderfw/model/storage/db/db_storage.rb', line 623 def safe_schema_conversion?(current, field) attributes = field[:attributes] safe = self.class.safe_conversions if (current[:type] != field[:type]) if safe[current[:type]] && safe[current[:type]].include?(field[:type]) return true else return false end end return true if ((!current[:length] || current[:length] == 0) \ || (attributes[:length] && current[:length] <= attributes[:length])) && \ ((!current[:precision] || current[:precision] == 0) \ || (attributes[:precision] && current[:precision] <= attributes[:precision])) return false end |
#schema_field_equal?(current, field) ⇒ Boolean
Checks if a DB field is equal to a schema field.
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# File 'lib/spiderfw/model/storage/db/db_storage.rb', line 608 def schema_field_equal?(current, field) attributes = field[:attributes] return false unless current[:type] == field[:type] || (self.class.type_synonyms && self.class.type_synonyms[current[:type]] && self.class.type_synonyms[current[:type]].include?(field[:type])) try_method = :"schema_field_#{field[:type].downcase}_equal?" return send(try_method, current, field) if (respond_to?(try_method)) current[:length] ||= 0; attributes[:length] ||= 0; current[:precision] ||= 0; attributes[:precision] ||= 0 return false unless current[:length] == attributes[:length] return false unless current[:precision] == attributes[:precision] return true end |
#sequence_name(name) ⇒ Object
Fixes a string to be used as a sequence name.
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# File 'lib/spiderfw/model/storage/db/db_storage.rb', line 100 def sequence_name(name) return name.to_s.gsub(':', '_') end |
#shorten_identifier(name, length) ⇒ Object
Shortens a DB name up to length.
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# File 'lib/spiderfw/model/storage/db/db_storage.rb', line 641 def shorten_identifier(name, length) while (name.length > length) parts = name.split('_') max = 0 max_i = nil parts.each_index do |i| if (parts[i].length > max) max = parts[i].length max_i = i end end parts[max_i] = parts[max_i][0..-2] name = parts.join('_') name.gsub!('_+', '_') end return name end |
#sql_add_field(table_name, name, type, attributes) ⇒ Object
Returns an array of SQL statements to add a field.
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# File 'lib/spiderfw/model/storage/db/db_storage.rb', line 588 def sql_add_field(table_name, name, type, attributes) ["ALTER TABLE #{table_name} ADD #{sql_table_field(name, type, attributes)}"] end |
#sql_alter_field(table_name, name, type, attributes) ⇒ Object
Returns an array of SQL statements to alter a field.
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# File 'lib/spiderfw/model/storage/db/db_storage.rb', line 593 def sql_alter_field(table_name, name, type, attributes) ["ALTER TABLE #{table_name} MODIFY #{sql_table_field(name, type, attributes)}"] end |
#sql_alter_table(alter) ⇒ Object
Returns an array of SQL statements for an alter structured description.
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# File 'lib/spiderfw/model/storage/db/db_storage.rb', line 491 def sql_alter_table(alter) current = alter[:current] table_name = alter[:table] add_fields = alter[:add_fields] alter_fields = alter[:alter_fields] alter_attributes = alter[:attributes] sqls = [] add_fields.each do |field| name, type, attributes = field sqls += sql_add_field(table_name, field[:name], field[:type], field[:attributes]) end alter_fields.each do |field| name, type, attributes = field sqls += sql_alter_field(table_name, field[:name], field[:type], field[:attributes]) end if (alter_attributes[:primary_keys] && !alter_attributes[:primary_keys].empty?) sqls << sql_drop_primary_key(table_name) if (current[:primary_keys] && !current[:primary_keys].empty? && current[:primary_keys] != alter_attributes[:primary_keys]) sqls << sql_create_primary_key(table_name, alter_attributes[:primary_keys]) end if (alter_attributes[:foreign_key_constraints]) cur_fkc = current && current[:foreign_key_constraints] ? current[:foreign_key_constraints] : [] cur_fkc.each do |fkc| next if alter_attributes[:foreign_key_constraints].include?(fkc) sqls << sql_drop_foreign_key(table_name, foreign_key_name(fkc.name)) end if (alter_attributes[:foreign_key_constraints]) alter_attributes[:foreign_key_constraints].each do |fkc| next if cur_fkc.include?(fkc) sql = "ALTER TABLE #{table_name} ADD CONSTRAINT #{foreign_key_name(fkc.name)} FOREIGN KEY (#{fkc.fields.keys.join(',')}) " sql += "REFERENCES #{fkc.table} (#{fkc.fields.values.join(',')})" sqls << sql end end end return sqls end |
#sql_condition(query) ⇒ Object
Returns SQL and bound variables for a condition.
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# File 'lib/spiderfw/model/storage/db/db_storage.rb', line 303 def sql_condition(query) condition = query[:condition] return ['', []] unless (condition && condition[:values]) bind_vars = [] condition[:values].reject!{ |v| v.is_a?(Hash) && v[:values].empty? } mapped = condition[:values].map do |v| if (v.is_a? Hash) # subconditions # FIXME: optimize removing recursion sql, vals = sql_condition({:condition => v}) bind_vars += vals sql = nil if sql.empty? sql = "(#{sql})" if sql && v[:values].length > 1 sql elsif (v[2].is_a? Spider::QueryFuncs::Expression) sql_condition_value(v[0], v[1], v[2].to_s, false) else v[1] = 'between' if (v[2].is_a?(Range)) v[2].upcase! if (v[1].to_s.downcase == 'ilike') if (v[1].to_s.downcase == 'between') bind_vars << v[2].first bind_vars << v[2].last else bind_vars << v[2] unless v[2].nil? end sql_condition_value(v[0], v[1], v[2]) end end return mapped.select{ |p| p != nil}.join(' '+condition[:conj]+' '), bind_vars end |
#sql_condition_value(key, comp, value, bound_vars = true) ⇒ Object
Returns the SQL for a condition comparison.
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# File 'lib/spiderfw/model/storage/db/db_storage.rb', line 335 def sql_condition_value(key, comp, value, bound_vars=true) if (comp.to_s.downcase == 'ilike') comp = 'like' key = "UPPER(#{key})" end if (value.nil?) comp = comp == '=' ? "IS" : "IS NOT" sql = "#{key} #{comp} NULL" else if comp.to_s.downcase == 'between' if bound_vars val0 = val1 = '?' else val0, val1 = value end sql = "#{key} #{comp} #{val0} AND #{val1}" else val = bound_vars ? '?' : value sql = "#{key} #{comp} #{val}" if comp == '<>' sql = "(#{sql} or #{key} IS NULL)" end end end return sql end |
#sql_create_primary_key(table_name, fields) ⇒ Object
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# File 'lib/spiderfw/model/storage/db/db_storage.rb', line 566 def sql_create_primary_key(table_name, fields) "ALTER TABLE #{table_name} ADD PRIMARY KEY ("+fields.join(', ')+")" end |
#sql_create_table(create) ⇒ Object
Returns an array of SQL statements for a create structured description.
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# File 'lib/spiderfw/model/storage/db/db_storage.rb', line 472 def sql_create_table(create) name = create[:table] fields = create[:fields] sql_fields = '' fields.each do |field| attributes = field[:attributes] attributes ||= {} length = attributes[:length] sql_fields += ', ' unless sql_fields.empty? sql_fields += sql_table_field(field[:name], field[:type], attributes) end if (create[:attributes][:primary_keys] && !create[:attributes][:primary_keys].empty?) primary_key_fields = create[:attributes][:primary_keys].join(', ') sql_fields += ", PRIMARY KEY (#{primary_key_fields})" end ["CREATE TABLE #{name} (#{sql_fields})"] end |
#sql_delete(delete, force = false) ⇒ Object
Returns SQL and bound values for a DELETE statement.
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# File 'lib/spiderfw/model/storage/db/db_storage.rb', line 458 def sql_delete(delete, force=false) curr[:last_query_type] = :delete where, bind_vars = sql_condition(delete) where = "1=0" if !force && (!where || where.empty?) sql = "DELETE FROM #{delete[:table]}" sql += " WHERE #{where}" if where && !where.empty? return [sql, bind_vars] end |
#sql_drop_field(table_name, field_name) ⇒ Object
Returns an array of SQL statements to drop a field.
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# File 'lib/spiderfw/model/storage/db/db_storage.rb', line 598 def sql_drop_field(table_name, field_name) ["ALTER TABLE #{table_name} DROP COLUMN #{field_name}"] end |
#sql_drop_foreign_key(table_name, key_name) ⇒ Object
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# File 'lib/spiderfw/model/storage/db/db_storage.rb', line 562 def sql_drop_foreign_key(table_name, key_name) "ALTER TABLE #{table_name} DROP FOREIGN KEY #{key_name}" end |
#sql_drop_primary_key(table_name) ⇒ Object
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# File 'lib/spiderfw/model/storage/db/db_storage.rb', line 558 def sql_drop_primary_key(table_name) "ALTER TABLE #{table_name} DROP PRIMARY KEY" end |
#sql_drop_table(table_name) ⇒ Object
Returns an array of SQL statements needed to drop a table.
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# File 'lib/spiderfw/model/storage/db/db_storage.rb', line 603 def sql_drop_table(table_name) ["DROP TABLE #{table_name}"] end |
#sql_insert(insert) ⇒ Object
Returns SQL and values for an insert statement.
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# File 'lib/spiderfw/model/storage/db/db_storage.rb', line 424 def sql_insert(insert) curr[:last_query_type] = :insert sql = "INSERT INTO #{insert[:table]} (#{insert[:values].keys.map{ |k| k.name }.join(', ')}) " + "VALUES (#{insert[:values].values.map{'?'}.join(', ')})" return [sql, insert[:values].values] end |
#sql_joins(joins) ⇒ Object
Returns SQL and values for DB joins.
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# File 'lib/spiderfw/model/storage/db/db_storage.rb', line 376 def sql_joins(joins) types = { :inner => 'INNER', :outer => 'OUTER', :left => 'LEFT OUTER', :right => 'RIGHT OUTER' } values = [] sql = joins.map{ |join| to_t = join[:as] || join[:to] sql_on = join[:keys].map{ |from_f, to_f| to_field = to_f.is_a?(FieldExpression) ? to_f.expression : "#{to_t}.#{to_f.name}" if from_f.is_a?(FieldExpression) "#{to_field} = #{from_f.expression}" else "#{from_f} = #{to_field}" end }.join(' AND ') if (join[:condition]) condition_sql, condition_values = sql_condition({:condition => join[:condition]}) sql_on += " and #{condition_sql}" values += condition_values end j = "#{types[join[:type]]} JOIN #{join[:to]}" j += " #{join[:as]}" if join[:as] j += " ON (#{sql_on})" j }.join(" ") return [sql, values] end |
#sql_keys(query) ⇒ Object
Returns the SQL for select keys.
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# File 'lib/spiderfw/model/storage/db/db_storage.rb', line 264 def sql_keys(query) query[:keys].join(',') end |
#sql_limit(query) ⇒ Object
Returns the LIMIT and OFFSET SQL.
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# File 'lib/spiderfw/model/storage/db/db_storage.rb', line 416 def sql_limit(query) sql = "" sql += "LIMIT #{query[:limit]} " if query[:limit] sql += "OFFSET #{query[:offset]} " if query[:offset] return sql end |
#sql_max(max) ⇒ Object
Aggregates #
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# File 'lib/spiderfw/model/storage/db/db_storage.rb', line 700 def sql_max(max) values = [] from_sql, from_values = sql_tables(max) values += from_values sql = "SELECT MAX(#{max[:field]}) AS M FROM #{from_sql}" if (max[:condition]) condition_sql, condition_values = sql_condition(max) sql += " WHERE #{condition_sql}" values += condition_values end return sql, values end |
#sql_order(query, replacements = {}) ⇒ Object
Returns SQL for the ORDER part.
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# File 'lib/spiderfw/model/storage/db/db_storage.rb', line 405 def sql_order(query, replacements={}) return '' unless query[:order] replacements ||= {} return query[:order].map{|o| repl = replacements[o[0].to_s] ofield = repl ? repl : o[0] "#{ofield} #{o[1]}" }.join(' ,') end |
#sql_select(query) ⇒ Object
Returns a two element array, containing the SQL for given select query, and the variables to bind.
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# File 'lib/spiderfw/model/storage/db/db_storage.rb', line 243 def sql_select(query) curr[:last_query_type] = :select bind_vars = query[:bind_vars] || [] tables_sql, tables_values = sql_tables(query) sql = "SELECT #{sql_keys(query)} FROM #{tables_sql} " bind_vars += tables_values where, vals = sql_condition(query) bind_vars += vals sql += "WHERE #{where} " if where && !where.empty? order = sql_order(query) sql += "ORDER BY #{order} " if order && !order.empty? limit = sql_limit(query) sql += limit if limit return sql, bind_vars end |
#sql_table_field(name, type, attributes) ⇒ Object
Returns the SQL for a field definition (used in create and alter table)
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# File 'lib/spiderfw/model/storage/db/db_storage.rb', line 571 def sql_table_field(name, type, attributes) f = "#{name} #{type}" if (type == 'DECIMAL') f += "(#{attributes[:precision]}, #{attributes[:scale]})" else if attributes[:length] && attributes[:length] != 0 f += "(#{attributes[:length]})" elsif attributes[:precision] f += "(#{attributes[:precision]}" f += "#{attributes[:scale]}" if attributes[:scale] f += ")" end end return f end |
#sql_tables(query) ⇒ Object
Returns an array containing the ‘FROM’ part of an SQL query (including joins), and the bound variables, if any.
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# File 'lib/spiderfw/model/storage/db/db_storage.rb', line 270 def sql_tables(query) values = [] sql = query[:tables].map{ |table| str = table.name if (query[:joins] && query[:joins][table]) join_str, join_values = sql_tables_join(query, table) str += " "+join_str values += join_values end str }.join(', ') return [sql, values] end |
#sql_tables_join(query, table) ⇒ Object
Returns SQL and bound variables for joins.
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# File 'lib/spiderfw/model/storage/db/db_storage.rb', line 285 def sql_tables_join(query, table) str = "" values = [] query[:joins][table].each_key do |to_table| join, join_values = sql_joins(query[:joins][table][to_table]) str += " "+join values += join_values if (query[:joins][to_table]) query[:joins][to_table].delete(table) # avoid endless loop sub_str, sub_values = sql_tables_join(query, to_table) str += " "+sub_str values += sub_values end end return str, values end |
#sql_truncate(table) ⇒ Object
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# File 'lib/spiderfw/model/storage/db/db_storage.rb', line 467 def sql_truncate(table) "TRUNCATE #{table}" end |
#sql_update(update) ⇒ Object
Returns SQL and values for an update statement.
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# File 'lib/spiderfw/model/storage/db/db_storage.rb', line 432 def sql_update(update) curr[:last_query_type] = :update values = [] tables = update[:table].to_s if (update[:joins] && update[:joins][update[:table]]) join_str, join_values = sql_tables_join(update, update[:table]) tables += " "+join_str values += join_values end values += update[:values].values.reject{ |v| v.is_a?(Spider::QueryFuncs::Expression) } sql = "UPDATE #{tables} SET " sql += sql_update_values(update) where, bind_vars = sql_condition(update) values += bind_vars sql += " WHERE #{where}" return [sql, values] end |
#sql_update_values(update) ⇒ Object
Returns the COLUMN = val, … part of an update statement.
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# File 'lib/spiderfw/model/storage/db/db_storage.rb', line 451 def sql_update_values(update) update[:values].map{ |k, v| v.is_a?(Spider::QueryFuncs::Expression) ? "#{k.name} = #{v}" : "#{k.name} = ?" }.join(', ') end |
#table_name(name) ⇒ Object
Fixes a string to be used as a table name.
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# File 'lib/spiderfw/model/storage/db/db_storage.rb', line 95 def table_name(name) return name.to_s.gsub(':', '_') end |
#total_rows ⇒ Object
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# File 'lib/spiderfw/model/storage/db/db_storage.rb', line 259 def total_rows curr[:total_rows] end |
#value_to_mapper(type, value) ⇒ Object
Converts a value loaded from the DB to return it to the mapper.
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# File 'lib/spiderfw/model/storage/db/db_storage.rb', line 196 def value_to_mapper(type, value) if (type.name == 'String' || type.name == 'Spider::DataTypes::Text') enc = @configuration['encoding'] if (enc && enc.downcase != 'utf-8') begin value = Iconv.conv('utf-8//IGNORE', enc, value.to_s+' ')[0..-2] if value rescue Iconv::InvalidCharacter value = '' end end end return value end |