Class: ActiveRecord::ConnectionAdapters::IBM_DBAdapter
- Inherits:
-
AbstractAdapter
- Object
- AbstractAdapter
- ActiveRecord::ConnectionAdapters::IBM_DBAdapter
- Defined in:
- lib/active_record/connection_adapters/ibm_db_adapter.rb
Overview
The IBM_DB Adapter requires the native Ruby driver (ibm_db) for IBM data servers (ibm_db.so). config
the hash passed as an initializer argument content:
mandatory parameters
adapter: 'ibm_db' // IBM_DB Adapter name
username: 'db2user' // data server (database) user
password: 'secret' // data server (database) password
database: 'ARUNIT' // remote database name (or catalog entry alias)
optional (highly recommended for data server auditing and monitoring purposes)
schema: 'rails123' // name space qualifier
account: 'tester' // OS account (client workstation)
app_user: 'test11' // authenticated application user
application: 'rtests' // application name
workstation: 'plato' // client workstation name
remote TCP/IP connection (required when no local database catalog entry available)
host: 'socrates' // fully qualified hostname or IP address
port: '50000' // data server TCP/IP port number
security: 'SSL' // optional parameter enabling SSL encryption -
// - Available only from CLI version V95fp2 and above
authentication: 'SERVER' // AUTHENTICATION type which the client uses -
// - to connect to the database server. By default value is SERVER
timeout: 10 // Specifies the time in seconds (0 - 32767) to wait for a reply from server -
//- when trying to establish a connection before generating a timeout
When schema is not specified, the username value is used instead.
Instance Attribute Summary collapse
-
#account ⇒ Object
Returns the value of attribute account.
-
#app_user ⇒ Object
Returns the value of attribute app_user.
-
#application ⇒ Object
Returns the value of attribute application.
-
#connection ⇒ Object
readonly
Returns the value of attribute connection.
-
#handle_lobs_triggered ⇒ Object
Returns the value of attribute handle_lobs_triggered.
-
#schema ⇒ Object
Returns the value of attribute schema.
-
#servertype ⇒ Object
readonly
Returns the value of attribute servertype.
-
#sql ⇒ Object
Returns the value of attribute sql.
-
#workstation ⇒ Object
Returns the value of attribute workstation.
Instance Method Summary collapse
-
#active? ⇒ Boolean
Tests the connection status.
-
#adapter_name ⇒ Object
Name of the adapter.
-
#add_limit_offset!(sql, options) ⇒ Object
Modifies a sql statement in order to implement a LIMIT and an OFFSET.
-
#begin_db_transaction ⇒ Object
Begins the transaction (and turns off auto-committing).
-
#change_column(table_name, column_name, type, options = {}) ⇒ Object
Changes the column’s definition according to the new options.
-
#change_column_default(table_name, column_name, default) ⇒ Object
Sets a new default value for a column.
-
#change_column_null(table_name, column_name, null, default = nil) ⇒ Object
Changes the nullability value of a column.
-
#columns(table_name, name = nil) ⇒ Object
Returns an array of Column objects for the table specified by
table_name
. -
#commit_db_transaction ⇒ Object
Commits the transaction and turns on auto-committing.
-
#create_table(name, options = {}) ⇒ Object
DATABASE STATEMENTS ==============================================.
-
#default_sequence_name(table, column) ⇒ Object
method add_limit_offset!.
-
#disconnect! ⇒ Object
Closes the current connection.
-
#execute(sql, name = nil) ⇒ Object
Executes and logs
sql
commands and returns aIBM_DB.Statement
object. -
#indexes(table_name, name = nil) ⇒ Object
Returns an array of non-primary key indexes for a specified table name.
-
#initialize(connection, logger, config, conn_options) ⇒ IBM_DBAdapter
constructor
A new instance of IBM_DBAdapter.
-
#insert(sql, name = nil, pk = nil, id_value = nil, sequence_name = nil) ⇒ Object
Perform an insert and returns the last ID generated.
-
#insert_fixture(fixture, table_name) ⇒ Object
inserts values from fixtures overridden to handle LOB’s fixture insertion, as, in normal inserts callbacks are triggered but during fixture insertion callbacks are not triggered hence only markers like @@@IBMBINARY@@@ will be inserted and are not updated to actual data.
-
#log_query(sql, name) ⇒ Object
:nodoc:.
-
#native_database_types ⇒ Object
Returns a Hash of mappings from the abstract data types to the native database types.
-
#quote(value, column = nil) ⇒ Object
Properly quotes the various data types.
- #quote_column_name(name) ⇒ Object
-
#quote_string(string) ⇒ Object
Quotes a given string, escaping single quote (‘) characters.
- #quoted_false ⇒ Object
-
#quoted_true ⇒ Object
true is represented by a smallint 1, false by 0, as no native boolean type exists in DB2.
-
#reconnect! ⇒ Object
Closes the current connection and opens a new one.
-
#remove_column(table_name, column_name) ⇒ Object
Removes the column from the table definition.
-
#remove_index(table_name, options = {}) ⇒ Object
Remove the given index from the table.
-
#rename_column(table_name, column_name, new_column_name) ⇒ Object
Renames a column.
-
#rename_table(name, new_name) ⇒ Object
Renames a table.
-
#rollback_db_transaction ⇒ Object
Rolls back the transaction and turns on auto-committing.
-
#select(sql, name = nil) ⇒ Object
Returns an array of hashes with the column names as keys and column values as values.
-
#select_one(sql, name = nil) ⇒ Object
Returns a record hash with the column names as keys and column values as values.
-
#select_rows(sql, name = nil) ⇒ Object
Returns an array of arrays containing the field values.
-
#supports_ddl_transactions? ⇒ Boolean
This Adapter supports DDL transactions.
-
#supports_migrations? ⇒ Boolean
This adapter supports migrations.
-
#table_alias_length ⇒ Object
Returns the maximum length a table alias identifier can be.
-
#tables(name = nil) ⇒ Object
Retrieves table’s metadata for a specified shema name.
-
#type_to_sql(type, limit = nil, precision = nil, scale = nil) ⇒ Object
IBM data servers do not support limits on certain data types (unlike MySQL) Limit is supported for the decimal, numeric, varchar, clob, blob data types.
-
#update(sql, name = nil) ⇒ Object
(also: #delete)
Executes an “UPDATE” SQL statement.
Constructor Details
#initialize(connection, logger, config, conn_options) ⇒ IBM_DBAdapter
Returns a new instance of IBM_DBAdapter.
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# File 'lib/active_record/connection_adapters/ibm_db_adapter.rb', line 412 def initialize(connection, logger, config, ) # Caching database connection configuration (+connect+ or +reconnect+ support) @connection = connection @conn_options = @database = config[:database] @username = config[:username] @password = config[:password] if config.has_key?(:host) @host = config[:host] @port = config[:port] || 50000 # default port end @schema = config[:schema] @security = config[:security] || nil @authentication = config[:authentication] || nil @timeout = config[:timeout] || 0 # default timeout value is 0 # Caching database connection options (auditing and billing support) @app_user = [:app_user] if .has_key?(:app_user) @account = [:account] if .has_key?(:account) @application = [:application] if .has_key?(:application) @workstation = [:workstation] if .has_key?(:workstation) @sql = [] @handle_lobs_triggered = false # Calls the parent class +ConnectionAdapters+' initializer # which sets @connection, @logger, @runtime and @last_verification super(@connection, logger) if @connection server_info = IBM_DB.server_info( @connection ) case server_info.DBMS_NAME when /DB2\//i # DB2 for Linux, Unix and Windows (LUW) case server_info.DBMS_VER when /09.07/i # DB2 Version 9.7 (Cobra) @servertype = IBM_DB2_LUW_COBRA.new(self) else # DB2 Version 9.5 or below @servertype = IBM_DB2_LUW.new(self) end when /DB2/i # DB2 for zOS case server_info.DBMS_VER when /09/ # DB2 for zOS version 9 @servertype = IBM_DB2_ZOS.new(self) when /08/ # DB2 for zOS version 8 @servertype = IBM_DB2_ZOS_8.new(self) else # DB2 for zOS version 7 raise "Only DB2 z/OS version 8 and above are currently supported" end when /AS/i # DB2 for i5 (iSeries) @servertype = IBM_DB2_I5.new(self) when /IDS/i # Informix Dynamic Server @servertype = IBM_IDS.new(self) end end # Executes the +set schema+ statement using the schema identifier provided @servertype.set_schema(@schema) if @schema && @schema != @username end |
Instance Attribute Details
#account ⇒ Object
Returns the value of attribute account.
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# File 'lib/active_record/connection_adapters/ibm_db_adapter.rb', line 405 def account @account end |
#app_user ⇒ Object
Returns the value of attribute app_user.
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# File 'lib/active_record/connection_adapters/ibm_db_adapter.rb', line 405 def app_user @app_user end |
#application ⇒ Object
Returns the value of attribute application.
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# File 'lib/active_record/connection_adapters/ibm_db_adapter.rb', line 405 def application @application end |
#connection ⇒ Object (readonly)
Returns the value of attribute connection.
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# File 'lib/active_record/connection_adapters/ibm_db_adapter.rb', line 403 def connection @connection end |
#handle_lobs_triggered ⇒ Object
Returns the value of attribute handle_lobs_triggered.
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# File 'lib/active_record/connection_adapters/ibm_db_adapter.rb', line 404 def handle_lobs_triggered @handle_lobs_triggered end |
#schema ⇒ Object
Returns the value of attribute schema.
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# File 'lib/active_record/connection_adapters/ibm_db_adapter.rb', line 405 def schema @schema end |
#servertype ⇒ Object (readonly)
Returns the value of attribute servertype.
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# File 'lib/active_record/connection_adapters/ibm_db_adapter.rb', line 403 def servertype @servertype end |
#sql ⇒ Object
Returns the value of attribute sql.
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# File 'lib/active_record/connection_adapters/ibm_db_adapter.rb', line 404 def sql @sql end |
#workstation ⇒ Object
Returns the value of attribute workstation.
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# File 'lib/active_record/connection_adapters/ibm_db_adapter.rb', line 405 def workstation @workstation end |
Instance Method Details
#active? ⇒ Boolean
Tests the connection status
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# File 'lib/active_record/connection_adapters/ibm_db_adapter.rb', line 545 def active? IBM_DB.active @connection rescue false end |
#adapter_name ⇒ Object
Name of the adapter
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# File 'lib/active_record/connection_adapters/ibm_db_adapter.rb', line 408 def adapter_name 'IBM_DB' end |
#add_limit_offset!(sql, options) ⇒ Object
Modifies a sql statement in order to implement a LIMIT and an OFFSET. A LIMIT defines the number of rows that should be fetched, while an OFFSET defines from what row the records must be fetched. IBM data servers implement a LIMIT in SQL statements through: FETCH FIRST n ROWS ONLY, where n is the number of rows required. The implementation of OFFSET is more elaborate, and requires the usage of subqueries and the ROW_NUMBER() command in order to add row numbering as an additional column to a copy of the existing table.
Examples
add_limit_offset!(‘SELECT * FROM staff’, => 10) generates: “SELECT * FROM staff FETCH FIRST 10 ROWS ONLY”
add_limit_offset!(‘SELECT * FROM staff’, => 10, :offset => 30) generates “SELECT O.* FROM (SELECT I.*, ROW_NUMBER() OVER () sys_rownum FROM (SELECT * FROM staff) AS I) AS O WHERE sys_row_num BETWEEN 31 AND 40”
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# File 'lib/active_record/connection_adapters/ibm_db_adapter.rb', line 859 def add_limit_offset!(sql, ) # If there is a limit if limit = [:limit] # if the limit is zero if limit == 0 # Returns a query that will always generate zero records # (e.g. WHERE sys_row_num BETWEEN 1 and 0) sql = @servertype.query_offset_limit(sql, 0, limit) # If there is a non-zero limit else offset = [:offset] # If an offset is specified builds the query with offset and limit, # otherwise retrieves only the first +limit+ rows sql = @servertype.query_offset_limit(sql, offset, limit) end end # Returns the sql query in any case sql end |
#begin_db_transaction ⇒ Object
Begins the transaction (and turns off auto-committing)
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# File 'lib/active_record/connection_adapters/ibm_db_adapter.rb', line 821 def begin_db_transaction # Turns off the auto-commit IBM_DB.autocommit(@connection, IBM_DB::SQL_AUTOCOMMIT_OFF) end |
#change_column(table_name, column_name, type, options = {}) ⇒ Object
Changes the column’s definition according to the new options. See TableDefinition#column for details of the options you can use.
Examples
change_column(:suppliers, :name, :string, :limit => 80)
change_column(:accounts, :description, :text)
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# File 'lib/active_record/connection_adapters/ibm_db_adapter.rb', line 1297 def change_column(table_name, column_name, type, = {}) @servertype.change_column(table_name, column_name, type, ) end |
#change_column_default(table_name, column_name, default) ⇒ Object
Sets a new default value for a column. This does not set the default value to NULL
, instead, it needs DatabaseStatements#execute which can execute the appropriate SQL statement for setting the value.
Examples
change_column_default(:suppliers, :qualification, 'new')
change_column_default(:accounts, :authorized, 1)
Method overriden to satisfy IBM data servers syntax.
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# File 'lib/active_record/connection_adapters/ibm_db_adapter.rb', line 1334 def change_column_default(table_name, column_name, default) @servertype.change_column_default(table_name, column_name, default) end |
#change_column_null(table_name, column_name, null, default = nil) ⇒ Object
Changes the nullability value of a column
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# File 'lib/active_record/connection_adapters/ibm_db_adapter.rb', line 1339 def change_column_null(table_name, column_name, null, default = nil) @servertype.change_column_null(table_name, column_name, null, default) end |
#columns(table_name, name = nil) ⇒ Object
Returns an array of Column objects for the table specified by table_name
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# File 'lib/active_record/connection_adapters/ibm_db_adapter.rb', line 1188 def columns(table_name, name = nil) # to_s required because it may be a symbol. table_name = @servertype.set_case(table_name.to_s) # Checks if a blank table name has been given. # If so it returns an empty array return [] if table_name.strip.empty? # +columns+ will contain the resulting array columns = [] # Statement required to access all the columns information if stmt = IBM_DB.columns( @connection, nil, @servertype.set_case(@schema), @servertype.set_case(table_name) ) begin # Fetches all the columns and assigns them to col. # +col+ is an hash with keys/value pairs for a column while col = IBM_DB.fetch_assoc(stmt) column_name = col["column_name"].downcase # Assigns the column default value. column_default_value = col["column_def"] # If there is no default value, it assigns NIL column_default_value = nil if (column_default_value && column_default_value.upcase == 'NULL') # Removes single quotes from the default value column_default_value.gsub!(/^'(.*)'$/, '\1') unless column_default_value.nil? # Assigns the column type column_type = col["type_name"].downcase # Assigns the field length (size) for the column column_length = col["column_size"] column_scale = col["decimal_digits"] # The initializer of the class Column, requires the +column_length+ to be declared # between brackets after the datatype(e.g VARCHAR(50)) for :string and :text types. # If it's a "for bit data" field it does a subsitution in place, if not # it appends the (column_length) string on the supported data types unless column_length.nil? || column_length == '' || column_type.sub!(/ \(\) for bit data/i,"(#{column_length}) FOR BIT DATA") || !column_type =~ /char|lob|graphic/i if column_type =~ /decimal/i column_type << "(#{column_length},#{column_scale})" elsif column_type =~ /smallint|integer|double|date|time|timestamp|xml/i column_type << "" # override native limits incompatible with table create else column_type << "(#{column_length})" end end # col["NULLABLE"] is 1 if the field is nullable, 0 if not. column_nullable = (col["nullable"] == 1) ? true : false # Make sure the hidden column (db2_generated_rowid_for_lobs) in DB2 z/OS isn't added to the list if !(column_name =~ /db2_generated_rowid_for_lobs/i) # Pushes into the array the *IBM_DBColumn* object, created by passing to the initializer # +column_name+, +default_value+, +column_type+ and +column_nullable+. columns << IBM_DBColumn.new(column_name, column_default_value, column_type, column_nullable) end end rescue StandardError # Handle driver fetch errors error_msg = IBM_DB.conn_errormsg error_msg = IBM_DB.stmt_errormsg if error_msg.empty? if error_msg && !error_msg.empty? raise "Failed to retrieve column metadata during fetch: #{error_msg}" else raise "An unexpected error occurred during retrieval of metadata" end ensure # Free resources associated with the statement IBM_DB.free_result(stmt) end else # Handle driver execution errors error_msg = IBM_DB.conn_errormsg error_msg = IBM_DB.stmt_errormsg if error_msg.empty? if error_msg && !error_msg.empty? raise "Failed to retrieve column metadata due to error: #{error_msg}" else raise StandardError.new('An unexpected error occurred during retrieval of columns metadata') end end # Returns the columns array return columns end |
#commit_db_transaction ⇒ Object
Commits the transaction and turns on auto-committing
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# File 'lib/active_record/connection_adapters/ibm_db_adapter.rb', line 827 def commit_db_transaction # Commits the transaction IBM_DB.commit @connection rescue nil # Turns on auto-committing IBM_DB.autocommit @connection, IBM_DB::SQL_AUTOCOMMIT_ON end |
#create_table(name, options = {}) ⇒ Object
DATABASE STATEMENTS
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# File 'lib/active_record/connection_adapters/ibm_db_adapter.rb', line 599 def create_table(name, = {}) @servertype.setup_for_lob_table super #Table definition is complete only when a unique index is created on the primarykey column for DB2 V8 on zOS #create index on id column if options[:id] is nil or id ==true #else check if options[:primary_key]is not nil then create an unique index on that column if ![:id].nil? || ![:primary_key].nil? if (![:id].nil? && [:id] == true) @servertype.create_index_after_table(name,"id") elsif ![:primary_key].nil? @servertype.create_index_after_table(name,[:primary_key].to_s) end else @servertype.create_index_after_table(name,"id") end end |
#default_sequence_name(table, column) ⇒ Object
method add_limit_offset!
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# File 'lib/active_record/connection_adapters/ibm_db_adapter.rb', line 879 def default_sequence_name(table, column) # :nodoc: "#{table}_#{column}_seq" end |
#disconnect! ⇒ Object
Closes the current connection
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# File 'lib/active_record/connection_adapters/ibm_db_adapter.rb', line 587 def disconnect! # Attempts to close the connection. The methods will return: # * true if succesfull # * false if the connection is already closed # * nil if an error is raised IBM_DB.close(@connection) rescue nil end |
#execute(sql, name = nil) ⇒ Object
Executes and logs sql
commands and returns a IBM_DB.Statement
object.
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# File 'lib/active_record/connection_adapters/ibm_db_adapter.rb', line 770 def execute(sql, name = nil) # Logs and execute the sql instructions. # The +log+ method is defined in the parent class +AbstractAdapter+ log(sql, name) do @servertype.execute(sql, name) end end |
#indexes(table_name, name = nil) ⇒ Object
Returns an array of non-primary key indexes for a specified table name
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# File 'lib/active_record/connection_adapters/ibm_db_adapter.rb', line 1068 def indexes(table_name, name = nil) # to_s required because +table_name+ may be a symbol. table_name = table_name.to_s # Checks if a blank table name has been given. # If so it returns an empty array of columns. return [] if table_name.strip.empty? indexes = [] pk_index = nil index_schema = [] #fetch the primary keys of the table using function primary_keys #TABLE_SCHEM:: pk_index[1] #TABLE_NAME:: pk_index[2] #COLUMN_NAME:: pk_index[3] #PK_NAME:: pk_index[5] if stmt = IBM_DB.primary_keys( @connection, nil, @servertype.set_case(@schema), @servertype.set_case(table_name)) begin while ( pk_index_row = IBM_DB.fetch_array(stmt) ) if pk_index_row[5] pk_index_name = pk_index_row[5].downcase pk_index_columns = [pk_index_row[3].downcase] # COLUMN_NAME if pk_index pk_index.columns = pk_index.columns + pk_index_columns else pk_index = IndexDefinition.new(table_name, pk_index_name, true, pk_index_columns) end end end rescue StandardError # Handle driver fetch errors error_msg = IBM_DB.conn_errormsg error_msg = IBM_DB.stmt_errormsg if error_msg.empty? if error_msg && !error_msg.empty? raise "Failed to retrieve primarykey metadata during fetch: #{error_msg}" else raise "An unexpected error occurred during retrieval of primary metadata" end ensure # Free resources associated with the statement IBM_DB.free_result(stmt) if stmt end else # Handle driver execution errors error_msg = IBM_DB.conn_errormsg error_msg = IBM_DB.stmt_errormsg if error_msg.empty? if error_msg && !error_msg.empty? raise "Failed to retrieve primary key metadata due to error: #{error_msg}" else raise StandardError.new('An unexpected error occurred during primary key retrieval') end end # Query table statistics for all indexes on the table # "TABLE_NAME: #{index_stats[2]}" # "NON_UNIQUE: #{index_stats[3]}" # "INDEX_NAME: #{index_stats[5]}" # "COLUMN_NAME: #{index_stats[8]}" if stmt = IBM_DB.statistics( @connection, nil, @servertype.set_case(@schema), @servertype.set_case(table_name), 1 ) begin while ( index_stats = IBM_DB.fetch_array(stmt) ) is_composite = false if index_stats[5] # INDEX_NAME index_name = index_stats[5].downcase index_unique = (index_stats[3] == 0) index_columns = [index_stats[8].downcase] # COLUMN_NAME index_qualifier = index_stats[4].downcase #Index_Qualifier # Create an IndexDefinition object and add to the indexes array i = 0; indexes.each do |index| if index.name == index_name && index_schema[i] == index_qualifier index.columns = index.columns + index_columns is_composite = true end i = i+1 end unless is_composite indexes << IndexDefinition.new(table_name, index_name, index_unique, index_columns) index_schema << index_qualifier end end end rescue StandardError # Handle driver fetch errors error_msg = IBM_DB.conn_errormsg error_msg = IBM_DB.stmt_errormsg if error_msg.empty? if error_msg && !error_msg.empty? raise "Failed to retrieve index metadata during fetch: #{error_msg}" else raise "An unexpected error occurred during retrieval of index metadata" end ensure # Free resources associated with the statement IBM_DB.free_result(stmt) if stmt end else # Handle driver execution errors error_msg = IBM_DB.conn_errormsg error_msg = IBM_DB.stmt_errormsg if error_msg.empty? if error_msg && !error_msg.empty? raise "Failed to retrieve index metadata due to error: #{error_msg}" else raise StandardError.new('An unexpected error occurred during index retrieval') end end # remove the primary key index entry.... should not be dumped by the dumper i = 0 indexes.each do |index| if pk_index && index.columns == pk_index.columns indexes.delete_at(i) end i = i+1 end # Returns the indexes array return indexes end |
#insert(sql, name = nil, pk = nil, id_value = nil, sequence_name = nil) ⇒ Object
Perform an insert and returns the last ID generated. This can be the ID passed to the method or the one auto-generated by the database, and retrieved by the last_generated_id
method.
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# File 'lib/active_record/connection_adapters/ibm_db_adapter.rb', line 749 def insert(sql, name = nil, pk = nil, id_value = nil, sequence_name = nil) if @handle_lobs_triggered #Ensure the array of sql is cleared if they have been handled in the callback @sql = [] @handle_lobs_triggered = false end clear_query_cache if defined? clear_query_cache if stmt = execute(sql, name) begin @sql << sql return id_value || @servertype.last_generated_id(stmt) # Ensures to free the resources associated with the statement ensure IBM_DB.free_result(stmt) end end end |
#insert_fixture(fixture, table_name) ⇒ Object
inserts values from fixtures overridden to handle LOB’s fixture insertion, as, in normal inserts callbacks are triggered but during fixture insertion callbacks are not triggered hence only markers like @@@IBMBINARY@@@ will be inserted and are not updated to actual data
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# File 'lib/active_record/connection_adapters/ibm_db_adapter.rb', line 689 def insert_fixture(fixture, table_name) insert_query = "INSERT INTO #{quote_table_name(table_name)} ( #{fixture.key_list})" insert_values = [] params = [] if @servertype.instance_of? IBM_IDS super return end column_list = columns(table_name) fixture.each do |item| col = nil column_list.each do |column| if column.name.downcase == item.at(0).downcase col= column break end end if item.at(1).nil? || item.at(1) == {} || (item.at(1) == '' && !(col.type.to_sym == :text)) params << 'NULL' elsif col.type.to_sym == :xml || col.type.to_sym == :text || col.type.to_sym == :binary # Add a '?' for the parameter or a NULL if the value is nil or empty # (except for a CLOB field where '' can be a value) insert_values << item.at(1) params << '?' else insert_values << quote(item.at(1),col) params << '?' end end insert_query << " VALUES ("+ params.join(',') + ")" unless stmt = IBM_DB.prepare(@connection, insert_query) error_msg = IBM_DB.conn_errormsg error_msg = IBM_DB.stmt_errormsg if error_msg.empty? if error_msg && !error_msg.empty? raise "Failed to prepare statement due to : #{error_msg}" else raise StandardError.new('An unexpected error occurred during insert') end end #log_query(insert_query,'fixture insert') log(insert_query,'fixture insert') do unless IBM_DB.execute(stmt, insert_values) raise "Failed to insert due to: #{IBM_DB.stmt_errormsg(stmt)}" else IBM_DB.free_result stmt end end end |
#log_query(sql, name) ⇒ Object
:nodoc:
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# File 'lib/active_record/connection_adapters/ibm_db_adapter.rb', line 535 def log_query(sql, name) #:nodoc: # Used by handle_lobs log(sql,name){} end |
#native_database_types ⇒ Object
Returns a Hash of mappings from the abstract data types to the native database types
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# File 'lib/active_record/connection_adapters/ibm_db_adapter.rb', line 974 def native_database_types { :primary_key => { :name => @servertype.primary_key}, :string => { :name => "varchar", :limit => 255 }, :text => { :name => "clob" }, :integer => { :name => "integer" }, :float => { :name => "float" }, :datetime => { :name => @servertype.get_datetime_mapping }, :timestamp => { :name => @servertype.get_datetime_mapping }, :time => { :name => @servertype.get_time_mapping }, :date => { :name => "date" }, :binary => { :name => "blob" }, # IBM data servers don't have a native boolean type. # A boolean can be represented by a smallint, # adopting the convention that False is 0 and True is 1 :boolean => { :name => "smallint"}, :xml => { :name => "xml"}, :decimal => { :name => "decimal" }, :rowid => { :name => "rowid" }, # rowid is a supported datatype on z/OS and i/5 :serial => { :name => "serial" }, # rowid is a supported datatype on Informix Dynamic Server :char => { :name => "char" }, :double => { :name => @servertype.get_double_mapping }, :decfloat => { :name => "decfloat"} } end |
#quote(value, column = nil) ⇒ Object
Properly quotes the various data types. value
contains the data, column
is optional and contains info on the field
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# File 'lib/active_record/connection_adapters/ibm_db_adapter.rb', line 890 def quote(value, column = nil) case value # If it's a numeric value and the column type is not a string, it shouldn't be quoted # (IBM_DB doesn't accept quotes on numeric types) when Numeric # If the column type is text or string, return the quote value if column && column.type.to_sym == :text || column && column.type.to_sym == :string unless caller[0] =~ /insert_fixture/i "'#{value}'" else "#{value}" end else # value is Numeric, column.type is not a string, # therefore it converts the number to string without quoting it value.to_s end when String, ActiveSupport::Multibyte::Chars if column && column.type.to_sym == :binary # If quoting is required for the insert/update of a BLOB unless caller[0] =~ /add_column_options/i # Invokes a convertion from string to binary @servertype.set_binary_value else # Quoting required for the default value of a column @servertype.set_binary_default(value) end elsif column && column.type.to_sym == :text unless caller[0] =~ /add_column_options/i "'@@@IBMTEXT@@@'" else @servertype.set_text_default(quote_string(value)) end elsif column && column.type.to_sym == :xml unless caller[0] =~ /add_column_options/i "'<ibm>@@@IBMXML@@@</ibm>'" else "#{value}" end else unless caller[0] =~ /insert_fixture/i "'#{quote_string(value)}'" else "#{value}" end end when TrueClass then quoted_true # return '1' for true when FalseClass then quoted_false # return '0' for false when NilClass if column && column.instance_of?(IBM_DBColumn) && !column.primary && !column.null "''" # allow empty inserts if not nullable or identity else # in order to support default ActiveRecord constructors "NULL" end else super # rely on superclass handling end end |
#quote_column_name(name) ⇒ Object
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# File 'lib/active_record/connection_adapters/ibm_db_adapter.rb', line 964 def quote_column_name(name) @servertype.check_reserved_words(name) end |
#quote_string(string) ⇒ Object
Quotes a given string, escaping single quote (‘) characters.
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# File 'lib/active_record/connection_adapters/ibm_db_adapter.rb', line 949 def quote_string(string) string.gsub(/'/, "''") end |
#quoted_false ⇒ Object
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# File 'lib/active_record/connection_adapters/ibm_db_adapter.rb', line 960 def quoted_false "0" end |
#quoted_true ⇒ Object
true is represented by a smallint 1, false by 0, as no native boolean type exists in DB2. Numerics are not quoted in DB2.
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# File 'lib/active_record/connection_adapters/ibm_db_adapter.rb', line 956 def quoted_true "1" end |
#reconnect! ⇒ Object
Closes the current connection and opens a new one
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# File 'lib/active_record/connection_adapters/ibm_db_adapter.rb', line 581 def reconnect! disconnect! connect end |
#remove_column(table_name, column_name) ⇒ Object
Removes the column from the table definition.
Examples
remove_column(:suppliers, :qualification)
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# File 'lib/active_record/connection_adapters/ibm_db_adapter.rb', line 1288 def remove_column(table_name, column_name) @servertype.remove_column(table_name, column_name) end |
#remove_index(table_name, options = {}) ⇒ Object
Remove the given index from the table.
Remove the suppliers_name_index in the suppliers table (legacy support, use the second or third forms).
remove_index :suppliers, :name
Remove the index named accounts_branch_id in the accounts table.
remove_index :accounts, :column => :branch_id
Remove the index named by_branch_party in the accounts table.
remove_index :accounts, :name => :by_branch_party
You can remove an index on multiple columns by specifying the first column.
add_index :accounts, [:username, :password]
remove_index :accounts, :username
Overriden to use the IBM data servers SQL syntax.
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# File 'lib/active_record/connection_adapters/ibm_db_adapter.rb', line 1356 def remove_index(table_name, = {}) execute("DROP INDEX #{index_name(table_name, )}") end |
#rename_column(table_name, column_name, new_column_name) ⇒ Object
Renames a column.
Example
rename_column(:suppliers, :description, :name)
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# File 'lib/active_record/connection_adapters/ibm_db_adapter.rb', line 1281 def rename_column(table_name, column_name, new_column_name) @servertype.rename_column(table_name, column_name, new_column_name) end |
#rename_table(name, new_name) ⇒ Object
Renames a table.
Example
rename_table(‘octopuses’, ‘octopi’) Overriden to satisfy IBM data servers syntax
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# File 'lib/active_record/connection_adapters/ibm_db_adapter.rb', line 1269 def rename_table(name, new_name) # SQL rename table statement rename_table_sql = "RENAME TABLE #{name} TO #{new_name}" stmt = execute(rename_table_sql) # Ensures to free the resources associated with the statement ensure IBM_DB.free_result stmt if stmt end |
#rollback_db_transaction ⇒ Object
Rolls back the transaction and turns on auto-committing. Must be done if the transaction block raises an exception or returns false
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# File 'lib/active_record/connection_adapters/ibm_db_adapter.rb', line 836 def rollback_db_transaction # ROLLBACK the transaction IBM_DB.rollback(@connection) rescue nil # Turns on auto-committing IBM_DB.autocommit @connection, IBM_DB::SQL_AUTOCOMMIT_ON end |
#select(sql, name = nil) ⇒ Object
Returns an array of hashes with the column names as keys and column values as values. sql
is the select query, and name
is an optional description for logging
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# File 'lib/active_record/connection_adapters/ibm_db_adapter.rb', line 621 def select(sql, name = nil) # Replaces {"= NULL" with " IS NULL"} OR {"IN (NULL)" with " IS NULL"} sql.gsub!( /(=\s*NULL|IN\s*\(NULL\))/i, " IS NULL" ) results = [] # Invokes the method +execute+ in order to log and execute the SQL # IBM_DB.Statement is returned from which results can be fetched if stmt = execute(sql, name) begin @servertype.select(sql, name, stmt, results) rescue StandardError # Handle driver fetch errors error_msg = IBM_DB.conn_errormsg error_msg = IBM_DB.stmt_errormsg if error_msg.empty? if error_msg && !error_msg.empty? raise StatementInvalid,"Failed to retrieve data: #{error_msg}" else raise "An unexpected error occurred during data retrieval" end ensure # Ensures to free the resources associated with the statement IBM_DB.free_result stmt end end # The array of record hashes is returned results end |
#select_one(sql, name = nil) ⇒ Object
Returns a record hash with the column names as keys and column values as values.
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# File 'lib/active_record/connection_adapters/ibm_db_adapter.rb', line 680 def select_one(sql, name = nil) # Gets the first hash from the array of hashes returned by # select_all select_all(sql,name).first end |
#select_rows(sql, name = nil) ⇒ Object
Returns an array of arrays containing the field values. This is an implementation for the abstract method sql
is the select query and name
is an optional description for logging
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# File 'lib/active_record/connection_adapters/ibm_db_adapter.rb', line 651 def select_rows(sql, name = nil) # Replaces {"= NULL" with " IS NULL"} OR {"IN (NULL)" with " IS NULL"} sql.gsub!( /(=\s*NULL|IN\s*\(NULL\))/i, " IS NULL" ) results = [] # Invokes the method +execute+ in order to log and execute the SQL # IBM_DB.Statement is returned from which results can be fetched if stmt = execute(sql, name) begin @servertype.select_rows(sql, name, stmt, results) rescue StandardError # Handle driver fetch errors error_msg = IBM_DB.conn_errormsg error_msg = IBM_DB.stmt_errormsg if error_msg.empty? if error_msg && !error_msg.empty? raise StatementInvalid,"Failed to retrieve data: #{error_msg}" else raise "An unexpected error occurred during data retrieval" end ensure # Ensures to free the resources associated with the statement IBM_DB.free_result stmt end end # The array of record hashes is returned results end |
#supports_ddl_transactions? ⇒ Boolean
This Adapter supports DDL transactions. This means CREATE TABLE and other DDL statements can be carried out as a transaction. That is the statements executed can be ROLLED BACK in case of any error during the process.
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# File 'lib/active_record/connection_adapters/ibm_db_adapter.rb', line 531 def supports_ddl_transactions? true end |
#supports_migrations? ⇒ Boolean
This adapter supports migrations. Current limitations: rename_column
is not currently supported by the IBM data servers remove_column
is not currently supported by the DB2 for zOS data server Tables containing columns of XML data type do not support remove_column
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# File 'lib/active_record/connection_adapters/ibm_db_adapter.rb', line 524 def supports_migrations? true end |
#table_alias_length ⇒ Object
Returns the maximum length a table alias identifier can be. IBM data servers (cross-platform) table limit is 128 characters
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# File 'lib/active_record/connection_adapters/ibm_db_adapter.rb', line 1024 def table_alias_length 128 end |
#tables(name = nil) ⇒ Object
Retrieves table’s metadata for a specified shema name
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# File 'lib/active_record/connection_adapters/ibm_db_adapter.rb', line 1029 def tables(name = nil) # Initializes the tables array tables = [] # Retrieve table's metadata through IBM_DB driver if stmt = IBM_DB.tables(@connection, nil, @servertype.set_case(@schema)) begin # Fetches all the records available while tab = IBM_DB.fetch_assoc(stmt) # Adds the lowercase table name to the array if(tab["table_type"]== 'TABLE') #check, so that only tables are dumped,IBM_DB.tables also returns views,alias etc in the schema tables << tab["table_name"].downcase end end rescue StandardError # Handle driver fetch errors error_msg = IBM_DB.conn_errormsg error_msg = IBM_DB.stmt_errormsg if error_msg.empty? if error_msg && !error_msg.empty? raise "Failed to retrieve table metadata during fetch: #{error_msg}" else raise "An unexpected error occurred during retrieval of table metadata" end ensure IBM_DB.free_result(stmt) # Free resources associated with the statement end else # Handle driver execution errors error_msg = IBM_DB.conn_errormsg error_msg = IBM_DB.stmt_errormsg if error_msg.empty? if error_msg && !error_msg.empty? raise "Failed to retrieve tables metadata due to error: #{error_msg}" else raise StandardError.new('An unexpected error occurred during retrieval of table metadata') end end # Returns the tables array return tables end |
#type_to_sql(type, limit = nil, precision = nil, scale = nil) ⇒ Object
IBM data servers do not support limits on certain data types (unlike MySQL) Limit is supported for the decimal, numeric, varchar, clob, blob data types.
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# File 'lib/active_record/connection_adapters/ibm_db_adapter.rb', line 1003 def type_to_sql(type, limit = nil, precision = nil, scale = nil) if type.to_sym == :decfloat sql_segment = native_database_types[type.to_sym][:name].to_s sql_segment << "(#{precision})" if !precision.nil? return sql_segment end return super if limit.nil? # strip off limits on data types not supporting them if @servertype.limit_not_supported_types.include? type.to_sym return native_database_types[type.to_sym][:name].to_s elsif type.to_sym == :boolean return "smallint" else return super end end |
#update(sql, name = nil) ⇒ Object Also known as: delete
Executes an “UPDATE” SQL statement
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# File 'lib/active_record/connection_adapters/ibm_db_adapter.rb', line 779 def update(sql, name = nil) if @handle_lobs_triggered #Ensure the array of sql is cleared if they have been handled in the callback @sql = [] @handle_lobs_triggered = false end clear_query_cache if defined? clear_query_cache # Make sure the WHERE clause handles NULL's correctly sqlarray = sql.split(/\s*WHERE\s*/) size = sqlarray.size if size > 1 sql = sqlarray[0] + " WHERE " if size > 2 1.upto size-2 do |index| sqlarray[index].gsub!( /(=\s*NULL|IN\s*\(NULL\))/i, " IS NULL" ) unless sqlarray[index].nil? sql = sql + sqlarray[index] + " WHERE " end end sqlarray[size-1].gsub!( /(=\s*NULL|IN\s*\(NULL\))/i, " IS NULL" ) unless sqlarray[size-1].nil? sql = sql + sqlarray[size-1] end # Logs and execute the given sql query. if stmt = execute(sql, name) begin @sql << sql # Retrieves the number of affected rows IBM_DB.num_rows(stmt) # Ensures to free the resources associated with the statement ensure IBM_DB.free_result(stmt) end end end |