Class: Spider::Model::Storage::Db::MSSQL
Instance Attribute Summary
Attributes inherited from BaseStorage
#instance_name, #url
Class Method Summary
collapse
Instance Method Summary
collapse
#total_rows
Methods inherited from DbStorage
#alter_table, #change_field, #collect_having_fields, #column_attributes, #column_name, #create_index, #create_table, #describe_table, #drop_field, #drop_index, #drop_table, #dump, #foreign_key_name, #function, #get_mapper, inherited, #initialize, #list_tables, #lock, #prepare_value, #query_finished, #query_start, #safe_schema_conversion?, #schema_field_equal?, #sequence_name, #shorten_identifier, #sql_add_field, #sql_add_index, #sql_alter_field, #sql_alter_table, #sql_change_field, #sql_condition, #sql_condition_value, #sql_create_primary_key, #sql_create_table, #sql_delete, #sql_drop_field, #sql_drop_foreign_key, #sql_drop_index, #sql_drop_primary_key, #sql_drop_table, #sql_insert, #sql_joins, #sql_keys, #sql_limit, #sql_max, #sql_order, #sql_table_field, #sql_tables, #sql_tables_join, #sql_truncate, #sql_update, #sql_update_values, storage_type, #table_name, #total_rows, #value_to_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, #get_mapper, #in_transaction, #in_transaction?, inherited, #initialize, max_connections, new_connection, #parse_url, #prepare_value, #release, release_connection, remove_connection, #rollback, #rollback!, #rollback_or_continue, #rollback_savepoint, #savepoint, #sequence_exists?, #sequence_file_path, #sequence_next, sequence_sync, #start_transaction, storage_type, #supports?, supports?, #supports_transactions?, #transactions_enabled?, #update_sequence, #value_for_condition, #value_for_save, #value_to_mapper
Methods included from Logger
add, check_request_level, 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?, #log, log, method_missing, open, reopen, request_level, send_to_loggers, set_request_level, unknown, #unknown, warn, #warn, warn?, #warn?
Class Method Details
.capabilities ⇒ Object
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# File 'lib/spiderfw/model/storage/db/adapters/mssql.rb', line 10
def self.capabilities
{
:autoincrement => true,
:sequences => false,
:transactions => true,
:foreign_keys => false }
end
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Instance Method Details
#column_type(type, attributes) ⇒ Object
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# File 'lib/spiderfw/model/storage/db/adapters/mssql.rb', line 19
def column_type(type, attributes)
case type.name
when 'String'
'nvarchar'
when 'Text'
'ntext'
when 'Fixnum'
'int'
when 'Float'
'real'
when 'BigDecimal', 'Spider::DataTypes::Decimal'
'decimal'
when 'Date', 'DateTime'
'datetime'
when 'Spider::DataTypes::Binary'
'varbinary'
when 'Spider::DataTypes::Bool'
'bit'
end
end
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#parse_db_column(col) ⇒ Object
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# File 'lib/spiderfw/model/storage/db/adapters/mssql.rb', line 94
def parse_db_column(col)
type, attributes = col[:type].split(' ', 2)
attributes = attributes.split(' ') if attributes
col[:type] = type
return col
end
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#query(query) ⇒ Object
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# File 'lib/spiderfw/model/storage/db/adapters/mssql.rb', line 40
def query(query)
return super unless query[:query_type] == :count
@last_query = query
query[:keys] = ['COUNT(*) AS N']
query[:order] = []
sql, bind_vars = sql_select(query)
return execute("#{sql} AS CountResult", *bind_vars)[0]['N'].to_i
end
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#reflect_column(table, column_name, column_attributes) ⇒ Object
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# File 'lib/spiderfw/model/storage/db/adapters/mssql.rb', line 101
def reflect_column(table, column_name, column_attributes)
column_type = column_attributes[:type]
el_type = nil
el_attributes = {}
case column_type
when 'varchar', 'nvarchar', 'char', 'nchar'
el_type = String
when 'text', 'ntext'
el_type = Spider::DataTypes::Text
when 'int', 'smallint'
el_type = Fixnum
when 'bit'
el_type = Spider::DataTypes::Bool
when 'real'
el_type = Float
when 'decimal'
el_type = BigDecimal
when 'datetime'
el_type = DateTime
when 'varbinary'
el_type = Spider::DataTypes::Binary
end
return el_type, el_attributes
end
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#sql_select(query) ⇒ Object
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# File 'lib/spiderfw/model/storage/db/adapters/mssql.rb', line 49
def sql_select(query)
bind_vars = query[:bind_vars] || []
if query[:limit] replaced_fields = {}
replace_cnt = 0
query[:order] << [query[:keys][0], 'desc'] if query[:order].length < 1
query[:order].each do |o|
field, direction = o
transformed = "O#{replace_cnt += 1}"
replaced_fields[field] = transformed
query[:keys] << "#{field} AS #{transformed}"
end
end
keys = sql_keys(query)
order = sql_order(query)
if (query[:limit])
keys += ", row_number() over (order by #{order}) mssql_row_num"
end
tables_sql, tables_values = sql_tables(query)
sql = "SELECT #{keys} 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)
if (query[:limit])
if (query[:offset])
limit = "mssql_row_num between ? and ?"
bind_vars << query[:offset] + 1
bind_vars << query[:offset] + query[:limit]
else
limit = "mssql_row_num < ?"
bind_vars << query[:limit] + 1
end
replaced_fields.each do |f, repl|
order = order.gsub(f.to_s, repl)
end
sql = "SELECT * FROM (#{sql}) as RowConstrainedResult WHERE #{limit} order by #{order}"
else
sql += "ORDER BY #{order} " if order && !order.empty?
end
return sql, bind_vars
end
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