Class: Spider::Model::Storage::Db::Oracle

Inherits:
DbStorage show all
Defined in:
lib/spiderfw/model/storage/db/adapters/oracle.rb

Defined Under Namespace

Classes: OracleNilValue

Class Attribute Summary collapse

Attributes inherited from BaseStorage

#instance_name, #url

Class Method Summary collapse

Instance Method Summary collapse

Methods inherited from DbStorage

#alter_table, #change_field, #collect_having_fields, #create_table, #drop_field, #drop_table, #function, #get_mapper, inherited, #initialize, #lock, #parse_db_column, #prepare_value, #query, #query_finished, #query_start, #reflect_column, #safe_schema_conversion?, #schema_field_equal?, #shorten_identifier, #sql_add_field, #sql_alter_table, #sql_change_field, #sql_condition, #sql_create_primary_key, #sql_create_table, #sql_drop_field, #sql_drop_table, #sql_joins, #sql_keys, #sql_max, #sql_order, #sql_table_field, #sql_tables, #sql_tables_join, #sql_truncate, storage_type

Methods inherited from BaseStorage

#==, #commit, #commit!, #commit_or_continue, #configure, #connect, #connected?, #connection, connection_alive?, #connection_attributes, connection_attributes, #connection_pool, connection_pools, #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, #prepare_value, #release, release_connection, remove_connection, #rollback, #rollback!, #rollback_savepoint, #savepoint, #sequence_file_path, sequence_sync, #start_transaction, storage_type, #supports?, supports?, #supports_transactions?, #transactions_enabled?, #value_for_save

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?

Constructor Details

This class inherits a constructor from Spider::Model::Storage::Db::DbStorage

Class Attribute Details

.reserved_kewords ⇒ Object (readonly)

Returns the value of attribute reserved_kewords.



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# File 'lib/spiderfw/model/storage/db/adapters/oracle.rb', line 18

def reserved_kewords
  @reserved_kewords
end

.safe_conversions ⇒ Object (readonly)

Returns the value of attribute safe_conversions.



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# File 'lib/spiderfw/model/storage/db/adapters/oracle.rb', line 18

def safe_conversions
  @safe_conversions
end

Class Method Details

.base_types ⇒ Object 



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# File 'lib/spiderfw/model/storage/db/adapters/oracle.rb', line 20

def self.base_types
    super << Spider::DataTypes::Binary
end

Instance Method Details

#column_attributes(type, attributes) ⇒ Object 



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# File 'lib/spiderfw/model/storage/db/adapters/oracle.rb', line 441

def column_attributes(type, attributes)
    db_attributes = super(type, attributes)
    case type.name
    when 'String'
        db_attributes[:length] = attributes[:length] || 255
    when 'Fixnum'
        db_attributes[:precision] = attributes[:precision] || 38
        db_attributes[:length] = nil
    when 'Float'
        # FIXME
        db_attributes[:precision] = attributes[:precision] if (attributes[:precision])
    when 'Spider::DataTypes::Bool'
        db_attributes[:precision] = 1
        db_attributes[:length] = nil
    end
    return db_attributes
end

#column_name(name) ⇒ Object 



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# File 'lib/spiderfw/model/storage/db/adapters/oracle.rb', line 464

def column_name(name)
    shorten_identifier(super, 30).upcase
end

#column_type(type, attributes) ⇒ Object

Schema methods



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# File 'lib/spiderfw/model/storage/db/adapters/oracle.rb', line 422

def column_type(type, attributes)
    case type.name
    when 'String'
        'VARCHAR2'
    when 'Spider::DataTypes::Text'
        'CLOB'
    when 'Fixnum'
        'NUMBER'
    when 'Float'
        'FLOAT'
    when 'Date', 'DateTime'
        'DATE'
    when 'Spider::DataTypes::Binary'
        'BLOB'
    when 'Spider::DataTypes::Bool'
        'NUMBER'
    end
end

#create_sequence(sequence_name, start = 1, increment = 1) ⇒ Object 



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# File 'lib/spiderfw/model/storage/db/adapters/oracle.rb', line 280

def create_sequence(sequence_name, start=1, increment=1)
    execute("create sequence #{sequence_name} start with #{start} increment by #{increment}")
end

#describe_table(table) ⇒ Object 



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# File 'lib/spiderfw/model/storage/db/adapters/oracle.rb', line 373

def describe_table(table)
    primary_keys = []
    o_foreign_keys = {}
    columns = {}
    order = []
    connection do |conn|
        cols = do_describe_table(conn, table)
        cols.each do |col|
            columns[col[:name]] = col
            order << col[:name]
        end
        res = execute("SELECT cols.table_name, cols.COLUMN_NAME, cols.position, cons.status, cons.owner
        FROM user_constraints cons, user_cons_columns cols
        WHERE cons.constraint_type = 'P'
        AND cons.constraint_name = cols.constraint_name
        AND cols.table_name = '#{table}'".split("\n").join(' '))
        res.each do |h|
            primary_keys << h['COLUMN_NAME']
        end
        res = execute("SELECT cons.constraint_name as CONSTRAINT_NAME, cols.column_name as REFERENCED_COLUMN,
        cols.table_name as REFERENCED_TABLE, cons.column_name as COLUMN_NAME
        FROM user_tab_columns col
            join user_cons_columns cons
              on col.table_name = cons.table_name 
             and col.column_name = cons.column_name
            join user_constraints cc 
              on cons.constraint_name = cc.constraint_name
            join user_cons_columns cols 
              on cc.r_constraint_name = cols.constraint_name 
             and cons.position = cols.position
        WHERE cc.constraint_type = 'R'
        AND cons.table_name = '#{table}'".split("\n").join(' '))
        res.each do |h|
            fk_name = h['CONSTRAINT_NAME']
            o_foreign_keys[fk_name] ||= {:table => h['REFERENCED_TABLE'], :columns => {}}
            o_foreign_keys[fk_name][:columns][h['COLUMN_NAME']] = h['REFERENCED_COLUMN']
        end
    end
    foreign_keys = []
    o_foreign_keys.each do |fk_name, fk_hash|
        foreign_keys << ForeignKeyConstraint.new(fk_name, fk_hash[:table], fk_hash[:columns])
    end
    return {:columns => columns, :order => order, :primary_keys => primary_keys, :foreign_key_constraints => foreign_keys}

end

#dump(stream, tables = nil) ⇒ Object 



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# File 'lib/spiderfw/model/storage/db/adapters/oracle.rb', line 320

def dump(stream, tables=nil)
    stream << "ALTER SESSION SET NLS_DATE_FORMAT = 'YYYY-MM-DD HH24:MI:SS';\n\n"
    super(stream, tables)
end

#dump_table_data(table, stream) ⇒ Object 



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# File 'lib/spiderfw/model/storage/db/adapters/oracle.rb', line 325

def dump_table_data(table, stream)
    connection do |c|
        cursor = c.parse("SELECT COUNT(*) AS N FROM #{table}")
        cursor.exec
        num = cursor.fetch[0]
        cursor.close
        cursor = c.parse("select * from #{table}")
        cursor.exec
        if num > 0
            info = describe_table(table)
            fields = info[:columns]
            stream << "INSERT INTO #{table} (#{info[:order].map{ |f| "#{f}"}.join(', ')})\n"
            stream << "VALUES\n"
            cnt = 0
            while row = cursor.fetch
                cnt += 1
                stream << "("
                info[:order].each_with_index do |f, i|
                    stream << dump_value(row[i], fields[f])
                    stream << ", " if i < fields.length - 1
                end
                stream << ")"
                if cnt < num
                    stream << ",\n"
                else
                    stream << ";\n"
                end
            end
            stream << "\n\n"
        end
        cursor.close
    end
end

#dump_value(val, field) ⇒ Object 



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# File 'lib/spiderfw/model/storage/db/adapters/oracle.rb', line 359

def dump_value(val, field)
    return 'NULL' if val.nil?
    type =  field[:type]
    if ['CHAR', 'VARCHAR', 'VARCHAR2', 'BLOB', 'CLOB'].include?(type)
        val = val.gsub("'", "''").gsub("\n", '\n').gsub("\r", '\r')
        return "'#{val}'"
    elsif ['DATE', 'TIME', 'DATETIME'].include?(type)
        val = val.strftime("%Y-%m-%d %H:%M:%S")
        return "'#{val}'"
    else
        return val.to_s
    end
end

#foreign_key_name(name) ⇒ Object 



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# File 'lib/spiderfw/model/storage/db/adapters/oracle.rb', line 472

def foreign_key_name(name)
    shorten_identifier(super, 30)
end

#get_table_create_sql(table) ⇒ Object 



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# File 'lib/spiderfw/model/storage/db/adapters/oracle.rb', line 303

def get_table_create_sql(table)
    sql = nil
    connection do |c|
        out = nil
        cursor = c.parse('BEGIN :out1 := DBMS_METADATA.GET_DDL(object_type=>:in1, name=>:in2); END;')
        cursor.bind_param(1, out, OCI8::CLOB)
        cursor.bind_param(2, 'TABLE', String)
        cursor.bind_param(3, table, String)
        res = cursor.exec
        sql = cursor[1].read
        cursor.close
        # cursor = c.parse('BEGIN DBMS_METADATA_UTIL.LOAD_STYLESHEETS(); END;')
        # cursor.exec
    end
    sql
end

#list_tables ⇒ Object 



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# File 'lib/spiderfw/model/storage/db/adapters/oracle.rb', line 297

def list_tables
    tables = execute("SELECT TABLE_NAME FROM user_tables ORDER BY table_name").map{ |r| r['TABLE_NAME'] }
    mv = execute("SELECT OBJECT_NAME FROM user_objects WHERE OBJECT_TYPE = 'MATERIALIZED VIEW'").map{ |r| r['OBJECT_NAME'] }
    tables - mv
end

#parse_url(url) ⇒ Object 



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# File 'lib/spiderfw/model/storage/db/adapters/oracle.rb', line 26

def parse_url(url)
    # db:oracle://<username:password>:connect_role@<database>
    # where database is
    # the net8 connect descriptor (TNS) or
    # for Oracle client 10g or later, hostname_or_ip:port_no/oracle_sid
    if (url =~ /.+:\/\/(?:(.+):(.+)(?::(.+))?@)?(.+)/)
        @user = $1
        @pass = $2
        @role = $3
        @dbname = $4
    else
        raise ArgumentError, "Oracle url '#{url}' is invalid"
    end
    @connection_params = [@user, @pass, @dbname, @role]
end

#post_execute ⇒ Object

Methods to get information from the db #



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# File 'lib/spiderfw/model/storage/db/adapters/oracle.rb', line 293

def post_execute
    curr[:bind_cnt] = 0
end

#schema_field_number_equal?(current, field) ⇒ Boolean

Returns:

  • (Boolean) 


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# File 'lib/spiderfw/model/storage/db/adapters/oracle.rb', line 481

def schema_field_number_equal?(current, field)
    # FIXME: where is the precision?
    return true
end

#schema_field_varchar2_equal?(current, field) ⇒ Boolean

Returns:

  • (Boolean) 


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# File 'lib/spiderfw/model/storage/db/adapters/oracle.rb', line 476

def schema_field_varchar2_equal?(current, field)
    # FIXME: can't find the length
    return true
end

#sequence_exists?(sequence_name) ⇒ Boolean

Returns:

  • (Boolean) 


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# File 'lib/spiderfw/model/storage/db/adapters/oracle.rb', line 274

def sequence_exists?(sequence_name)
    check = "select SEQUENCE_NAME from user_sequences where sequence_name = :1"
    res = execute(check, sequence_name)
    return res[0] ? true : false
end

#sequence_name(name) ⇒ Object 



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# File 'lib/spiderfw/model/storage/db/adapters/oracle.rb', line 468

def sequence_name(name)
    shorten_identifier(name, 30).upcase
end

#sequence_next(sequence_name) ⇒ Object 



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# File 'lib/spiderfw/model/storage/db/adapters/oracle.rb', line 80

def sequence_next(sequence_name)
    res = execute("SELECT #{sequence_name}.NEXTVAL AS NEXT FROM DUAL")
    return res[0]['NEXT'].to_i
end

#sql_alter_field(table_name, name, type, attributes) ⇒ Object 



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# File 'lib/spiderfw/model/storage/db/adapters/oracle.rb', line 270

def sql_alter_field(table_name, name, type, attributes)
    ["ALTER TABLE #{table_name} MODIFY #{sql_table_field(name, type, attributes)}"]
end

#sql_condition_value(key, comp, value, bound_vars = true) ⇒ Object 



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# File 'lib/spiderfw/model/storage/db/adapters/oracle.rb', line 210

def sql_condition_value(key, comp, value, bound_vars=true)
    curr[:bind_cnt] ||= 0
    key = key.expression if key.is_a?(FieldExpression)
    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 = ":#{(curr[:bind_cnt] += 1)}"; val1 = ":#{(curr[:bind_cnt] += 1)}"
            else
                val0, val1 = value
            end
            sql = "#{key} #{comp} #{val0} AND #{val1}"
        else
            val = bound_vars ? ":#{(curr[:bind_cnt] += 1)}" : value
            sql = "#{key} #{comp} #{val}"
            if comp == '<>'
                sql = "(#{sql} or #{key} IS NULL)"
            end
        end
    end
    return sql
end

#sql_delete(del, force = false) ⇒ Object 



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# File 'lib/spiderfw/model/storage/db/adapters/oracle.rb', line 265

def sql_delete(del, force=false)
    curr[:bind_cnt] = 0
    super
end

#sql_drop_foreign_key(table_name, key_name) ⇒ Object 



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# File 'lib/spiderfw/model/storage/db/adapters/oracle.rb', line 104

def sql_drop_foreign_key(table_name, key_name)
    "ALTER TABLE #{table_name} DROP CONSTRAINT #{key_name}"
end

#sql_drop_primary_key(table_name) ⇒ Object

SQL methods #



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# File 'lib/spiderfw/model/storage/db/adapters/oracle.rb', line 90

def sql_drop_primary_key(table_name)
    constraint_name = nil
    connection do |conn|
        res = conn.exec("SELECT cons.CONSTRAINT_NAME FROM USER_CONSTRAINTS cons, user_cons_columns cols 
                           WHERE cons.constraint_type = 'P'
                           AND cons.constraint_name = cols.constraint_name
                           AND cols.table_name = '#{table_name}'")
        if h = res.fetch_hash
            constraint_name = h['CONSTRAINT_NAME']
        end
    end
    "ALTER TABLE #{table_name} DROP CONSTRAINT #{constraint_name}"
end

#sql_insert(insert) ⇒ Object 



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# File 'lib/spiderfw/model/storage/db/adapters/oracle.rb', line 239

def sql_insert(insert)
    curr[:bind_cnt] = 0
    keys = insert[:values].keys.join(', ')
    vals = insert[:values].values.map{":#{(curr[:bind_cnt] += 1)}"}
    vals = vals.join(', ')
    sql = "INSERT INTO #{insert[:table]} (#{keys}) " +
          "VALUES (#{vals})"
    return [sql, insert[:values].values]
end

#sql_insert_values(insert) ⇒ Object 



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# File 'lib/spiderfw/model/storage/db/adapters/oracle.rb', line 249

def sql_insert_values(insert)
    insert[:values].values.map{":#{(curr[:bind_cnt] += 1)}"}.join(', ')
end

#sql_limit(query) ⇒ Object 



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# File 'lib/spiderfw/model/storage/db/adapters/oracle.rb', line 206

def sql_limit(query)
    # already done in sql_condition
end

#sql_select(query) ⇒ Object 



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# File 'lib/spiderfw/model/storage/db/adapters/oracle.rb', line 109

def sql_select(query)
    curr[:bind_cnt] = 0
    # Spider::Logger.debug("SQL SELECT:")
    # Spider::Logger.debug(query)
    bind_vars = query[:bind_vars] || []
    query[:order_replacements] ||= {}
    if query[:limit] # Oracle is so braindead
        replace_cnt = 0
        # add first field to order if none is found; order is needed for limit
        query[:order] << [query[:keys][0], 'desc'] if query[:order].length < 1
        query[:order].each do |o|
            field, direction = o
            
            if field.is_a?(Spider::Model::Storage::Db::Field) && !query[:tables].include?(field.table)
                query[:order_on_different_table] = true 
            end
            if field.is_a?(FieldFunction)
                query[:order_on_different_table] = true if field.joins.length > 0
            end
            if field.is_a?(Spider::Model::Storage::Db::Field) && field.type == 'CLOB'
                field = "CAST(#{field} as varchar2(100))"
            end
            field_expr = field.is_a?(FieldExpression) ? field.expression : field.to_s
            
            unless query[:keys].include?(field) || field.is_a?(FieldExpression)
               transformed = "O#{replace_cnt += 1}"
               query[:order_replacements][field.to_s] = transformed

               query[:keys] << Db::FieldExpression.new(field.table, transformed, field.type, :expression => field_expr)
           end
        end
    end
    keys = sql_keys(query)
    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 if vals
    sql += "WHERE #{where} " if where && !where.empty?

    having, having_vals = sql_condition(query, true)
    unless having.blank?
       unless (query[:limit] || query[:query_type] == :count) && !query[:joins].empty?

           group_fields = (
               query[:keys].select{ |k| !k.is_a?(FieldExpression)
           } + collect_having_fields(query[:condition])).flatten.uniq
           group_keys = sql_keys(group_fields)
           sql += "GROUP BY #{group_keys} "
           sql += "HAVING #{having} "
       end
       bind_vars += having_vals
    end

    order = sql_order(query, query[:order_replacements])
    if (query[:limit] || query[:query_type] == :count)
        limit = nil
        if (query[:offset])
            limit = "oci8_row_num between :#{curr[:bind_cnt]+=1} and :#{curr[:bind_cnt]+=1}"
            bind_vars << query[:offset] + 1
            bind_vars << query[:offset] + query[:limit]
        elsif query[:limit]
            limit = "oci8_row_num < :#{curr[:bind_cnt]+=1}"
            bind_vars << query[:limit] + 1
        end
        if (!query[:joins].empty?)
            data_tables_sql = query[:order_on_different_table] ? tables_sql : query[:tables].join(', ')
            pks = query[:primary_keys].reject{ |pk| pk.is_a?(Db::FieldExpression) }
            pk_sql = pks.join(', ')
            distinct_sql = "SELECT DISTINCT #{pk_sql} FROM #{tables_sql}"
            distinct_sql += " WHERE #{where}" unless where.blank?
            unless having.blank?

               group_keys = sql_keys((pks + collect_having_fields(query[:condition])).flatten.uniq)
               distinct_sql += " GROUP BY #{group_keys} "
               distinct_sql += " HAVING #{having}"
            end
            data_sql = "SELECT #{keys} FROM #{data_tables_sql} WHERE (#{pk_sql}) IN (#{distinct_sql})"
            data_sql += " order by #{order}" unless order.blank?
        else
            data_sql = sql
            data_sql += " order by #{order}" unless order.blank?
        end
        count_sql = "SELECT /*+ FIRST_ROWS(n) */ a.*, ROWNUM oci8_row_num FROM (#{data_sql}) a"
        if limit
            sql = "SELECT * FROM (#{count_sql}) WHERE #{limit}"
        else
            sql = count_sql
        end
    else
        sql += "ORDER BY #{order} " if order && !order.empty?
    end
    return sql, bind_vars
end

#sql_update(query) ⇒ Object 



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# File 'lib/spiderfw/model/storage/db/adapters/oracle.rb', line 253

def sql_update(query)
    curr[:bind_cnt] = 0
    super
end

#sql_update_values(update) ⇒ Object 



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# File 'lib/spiderfw/model/storage/db/adapters/oracle.rb', line 258

def sql_update_values(update)
    update[:values].map{ |k, v| 
        val = v.is_a?(Spider::QueryFuncs::Expression) ? v : ":#{(curr[:bind_cnt] += 1)}"
        "#{k} = #{val}"
    }.join(', ')
end

#table_name(name) ⇒ Object 



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# File 'lib/spiderfw/model/storage/db/adapters/oracle.rb', line 459

def table_name(name)
    table_name = name.to_s.gsub('::', '_')
    return shorten_identifier(table_name, 30).upcase
end

#total_rows ⇒ Object 



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# File 'lib/spiderfw/model/storage/db/adapters/oracle.rb', line 66

def total_rows
    return nil unless curr[:last_executed]
    q = curr[:last_query].clone
    unless (q[:offset] || q[:limit])
        return curr[:last_result_length] ? curr[:last_result_length] : nil
    end
    q.delete(:offset); q.delete(:limit)
    q[:query_type] = :count
    sql, vars = sql_select(q)
    res = execute("SELECT COUNT(*) AS N FROM (#{sql})", *vars)
    return nil unless res && res[0]
    return res[0]['N'].to_i
end

#update_sequence(name, val) ⇒ Object 



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# File 'lib/spiderfw/model/storage/db/adapters/oracle.rb', line 284

def update_sequence(name, val)
    execute("drop sequence #{name}")
    create_sequence(name, val)
end

#value_for_condition(type, value) ⇒ Object 



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# File 'lib/spiderfw/model/storage/db/adapters/oracle.rb', line 44

def value_for_condition(type, value)
    return value if value.nil?
    super
end

#value_to_mapper(type, value) ⇒ Object 



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# File 'lib/spiderfw/model/storage/db/adapters/oracle.rb', line 49

def value_to_mapper(type, value)
    case type.name
    when 'Date', 'DateTime'
        return nil unless value
        return value if value.class == type
        return value.to_datetime if type == DateTime
        return value.to_date # FIXME: check what is returned, here we espect an OCI8::Date
    when 'Spider::DataTypes::Text'
        value = value.read if value.respond_to?(:read)
    when 'Spider::DataTypes::Decimal', 'BigDecimal'
        value = value.to_s
    end
    return super(type, value)
end