Class: KBEngine

Inherits:
Object show all
Includes:
DRb::DRbUndumped, KBEncryptionMixin, KBTypeConversionsMixin
Defined in:
lib/kirbybase.rb

Overview

KBEngine

Constant Summary

Constants included from KBEncryptionMixin

KBEncryptionMixin::EN_KEY, KBEncryptionMixin::EN_KEY1, KBEncryptionMixin::EN_KEY_LEN, KBEncryptionMixin::EN_STR, KBEncryptionMixin::EN_STR_LEN

Constants included from KBTypeConversionsMixin

KBTypeConversionsMixin::ENCODE_RE, KBTypeConversionsMixin::KB_NIL, KBTypeConversionsMixin::UNENCODE_RE

Class Method Summary collapse

Instance Method Summary collapse

Methods included from KBEncryptionMixin

#encrypt_str, #unencrypt_str

Methods included from KBTypeConversionsMixin

#convert_to_encoded_string, #convert_to_native_type

Constructor Details

#initialize(db) ⇒ KBEngine

initialize



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# File 'lib/kirbybase.rb', line 768

def initialize(db)
    @db = db
    @recno_indexes = {}
    @indexes = {}

    # This hash will hold the table locks if in client/server mode.
    @mutex_hash = {} if @db.server?
end

Class Method Details

.create_called_from_database_instance(db) ⇒ Object

KBEngine.create_called_from_database_instance



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# File 'lib/kirbybase.rb', line 761

def KBEngine.create_called_from_database_instance(db)
    return new(db)
end

Instance Method Details

#add_column(table, field_def, after) ⇒ Object

add_column



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# File 'lib/kirbybase.rb', line 1296

def add_column(table, field_def, after)
    # Find the index position of where to insert the column, either at
    # the end (-1) or after the field specified.
    if after.nil? or table.field_names.last == after
        insert_after = -1
    else
        insert_after = table.field_names.index(after)+1
    end

    with_write_lock(table.name) do
        fptr = open(table.filename, 'r')
        new_fptr = open(table.filename+'temp', 'w')

        line = fptr.readline.chomp

        if line[0..0] == 'Z'
            header_rec = unencrypt_str(line[1..-1]).split('|')
        else
            header_rec = line.split('|')
        end

        if insert_after == -1
            header_rec.insert(insert_after, field_def)
        else
            # Need to account for recno ctr, delete ctr, record class.
            header_rec.insert(insert_after+3, field_def)
        end

        if line[0..0] == 'Z'
            new_fptr.write('Z' + encrypt_str(header_rec.join('|')) +
             "\n")
        else
            new_fptr.write(header_rec.join('|') + "\n")
        end

        begin
            while true
                line = fptr.readline.chomp

                if table.encrypted?
                    temp_line = unencrypt_str(line)
                else
                    temp_line = line
                end

                rec = temp_line.split('|', -1)
                rec.insert(insert_after, '')

                if table.encrypted?
                    new_fptr.write(encrypt_str(rec.join('|')) + "\n")
                else
                    new_fptr.write(rec.join('|') + "\n")
                end
            end
        # Here's how we break out of the loop...
        rescue EOFError
        end

        # Close the table and release the write lock.
        fptr.close
        new_fptr.close
        File.delete(table.filename)
        FileUtils.mv(table.filename+'temp', table.filename)
    end
end

#add_index(table, col_names, index_no) ⇒ Object

add_index



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# File 'lib/kirbybase.rb', line 1427

def add_index(table, col_names, index_no)
    with_write_lock(table.name) do
        fptr = open(table.filename, 'r')
        new_fptr = open(table.filename+'temp', 'w')

        line = fptr.readline.chomp

        if line[0..0] == 'Z'
            header_rec = unencrypt_str(line[1..-1]).split('|')
        else
            header_rec = line.split('|')
        end
        
        col_names.each do |c|
            header_rec[table.field_names.index(c)+3] += \
             ':Index->%d' % index_no
        end

        if line[0..0] == 'Z'
            new_fptr.write('Z' + encrypt_str(header_rec.join('|')) +
             "\n")
        else
            new_fptr.write(header_rec.join('|') + "\n")
        end

        begin
            while true
                new_fptr.write(fptr.readline)
            end
        # Here's how we break out of the loop...
        rescue EOFError
        end

        # Close the table and release the write lock.
        fptr.close
        new_fptr.close
        File.delete(table.filename)
        FileUtils.mv(table.filename+'temp', table.filename)
    end
end

#add_to_indexes(table, rec, fpos) ⇒ Object

add_to_indexes



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# File 'lib/kirbybase.rb', line 861

def add_to_indexes(table, rec, fpos)
    @recno_indexes[table.name].add_index_rec(rec.first, fpos)

    re_table_name = Regexp.new(table.name.to_s)
    @indexes.each_pair do |key, index|
        index.add_index_rec(rec) if key.to_s =~ re_table_name
    end
end

#change_column_default_value(table, col_name, value) ⇒ Object

change_column_default_value



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# File 'lib/kirbybase.rb', line 1520

def change_column_default_value(table, col_name, value)
    with_write_lock(table.name) do
        fptr = open(table.filename, 'r')
        new_fptr = open(table.filename+'temp', 'w')

        line = fptr.readline.chomp

        if line[0..0] == 'Z'
            header_rec = unencrypt_str(line[1..-1]).split('|')
        else
            header_rec = line.split('|')
        end
        
        if header_rec[table.field_names.index(col_name)+3] =~ \
         /Default->/
            hr_chunks = \
             header_rec[table.field_names.index(col_name)+3].split(':')

            if value.nil?
                hr_chunks = hr_chunks.delete_if { |x| x =~ /Default->/ }
                header_rec[table.field_names.index(col_name)+3] = \
                 hr_chunks.join(':')
            else
                hr_chunks.collect! do |x|
                    if x =~ /Default->/
                        'Default->%s' % value
                    else
                        x
                    end
                end
                header_rec[table.field_names.index(col_name)+3] = \
                 hr_chunks.join(':')
            end              
        else
            if value.nil?
            else
                header_rec[table.field_names.index(col_name)+3] += \
                 ':Default->%s' % value
            end    
        end

        if line[0..0] == 'Z'
            new_fptr.write('Z' + encrypt_str(header_rec.join('|')) +
             "\n")
        else
            new_fptr.write(header_rec.join('|') + "\n")
        end

        begin
            while true
                new_fptr.write(fptr.readline)
            end
        # Here's how we break out of the loop...
        rescue EOFError
        end

        # Close the table and release the write lock.
        fptr.close
        new_fptr.close
        File.delete(table.filename)
        FileUtils.mv(table.filename+'temp', table.filename)
    end
end

#change_column_required(table, col_name, required) ⇒ Object

change_column_required



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# File 'lib/kirbybase.rb', line 1587

def change_column_required(table, col_name, required)
    with_write_lock(table.name) do
        fptr = open(table.filename, 'r')
        new_fptr = open(table.filename+'temp', 'w')

        line = fptr.readline.chomp

        if line[0..0] == 'Z'
            header_rec = unencrypt_str(line[1..-1]).split('|')
        else
            header_rec = line.split('|')
        end
        
        if header_rec[table.field_names.index(col_name)+3
         ] =~ /Required->/
            hr_chunks = \
             header_rec[table.field_names.index(col_name)+3].split(':')
            if not required
                hr_chunks = hr_chunks.delete_if {|x| x =~ /Required->/}
                header_rec[table.field_names.index(col_name)+3] = \
                 hr_chunks.join(':')
            else
                hr_chunks.collect! do |x|
                    if x =~ /Required->/
                        'Default->%s' % required
                    else
                        x
                    end
                end
                header_rec[table.field_names.index(col_name)+3] = \
                 hr_chunks.join(':')
            end    
        else
            if not required
            else
                header_rec[table.field_names.index(col_name)+3] += \
                 ':Required->%s' % required
            end    
        end

        if line[0..0] == 'Z'
            new_fptr.write('Z' + encrypt_str(header_rec.join('|')) +
             "\n")
        else
            new_fptr.write(header_rec.join('|') + "\n")
        end

        begin
            while true
                new_fptr.write(fptr.readline)
            end
        # Here's how we break out of the loop...
        rescue EOFError
        end

        # Close the table and release the write lock.
        fptr.close
        new_fptr.close
        File.delete(table.filename)
        FileUtils.mv(table.filename+'temp', table.filename)
    end
end

#change_column_type(table, col_name, col_type) ⇒ Object

change_column_type



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# File 'lib/kirbybase.rb', line 1208

def change_column_type(table, col_name, col_type)
    col_index = table.field_names.index(col_name)
    with_write_lock(table.name) do
        fptr = open(table.filename, 'r')
        new_fptr = open(table.filename+'temp', 'w')

        line = fptr.readline.chomp

        if line[0..0] == 'Z'
            header_rec = unencrypt_str(line[1..-1]).split('|')
        else
            header_rec = line.split('|')
        end
        
        temp_fields = header_rec[col_index+3].split(':')
        temp_fields[1] = col_type.to_s
        header_rec[col_index+3] = temp_fields.join(':')

        if line[0..0] == 'Z'
            new_fptr.write('Z' + encrypt_str(header_rec.join('|')) +
             "\n")
        else
            new_fptr.write(header_rec.join('|') + "\n")
        end

        begin
            while true
                new_fptr.write(fptr.readline)
            end
        # Here's how we break out of the loop...
        rescue EOFError
        end

        # Close the table and release the write lock.
        fptr.close
        new_fptr.close
        File.delete(table.filename)
        FileUtils.mv(table.filename+'temp', table.filename)
    end
end

#delete_from_indexes(table, rec, fpos) ⇒ Object

delete_from_indexes



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# File 'lib/kirbybase.rb', line 873

def delete_from_indexes(table, rec, fpos)
    @recno_indexes[table.name].delete_index_rec(rec.recno)

    re_table_name = Regexp.new(table.name.to_s)
    @indexes.each_pair do |key, index|
        index.delete_index_rec(rec.recno) if key.to_s =~ re_table_name
    end
end

#delete_records(table, recs) ⇒ Object

delete_records



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# File 'lib/kirbybase.rb', line 1189

def delete_records(table, recs)
    with_write_locked_table(table) do |fptr|
        recs.each do |rec|
            # Go to offset within the file where the record is and
            # replace it with all spaces.
            write_record(table, fptr, rec.fpos, ' ' * rec.line_length)
            incr_del_ctr(table, fptr)

            delete_from_indexes(table, rec, rec.fpos)
        end

        # Return the number of records deleted.
        return recs.size
    end
end

#delete_table(tablename) ⇒ Object

delete_table



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# File 'lib/kirbybase.rb', line 959

def delete_table(tablename)
    with_write_lock(tablename) do
        File.delete(File.join(@db.path, tablename.to_s + @db.ext))
        remove_indexes(tablename)
        remove_recno_index(tablename)
        return true
    end
end

#drop_column(table, col_name) ⇒ Object

drop_column



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# File 'lib/kirbybase.rb', line 1365

def drop_column(table, col_name)
    col_index = table.field_names.index(col_name)
    with_write_lock(table.name) do
        fptr = open(table.filename, 'r')
        new_fptr = open(table.filename+'temp', 'w')

        line = fptr.readline.chomp

        if line[0..0] == 'Z'
            header_rec = unencrypt_str(line[1..-1]).split('|')
            header_rec.delete_at(col_index+3)
            new_fptr.write('Z' + encrypt_str(header_rec.join('|')) +
             "\n")
        else
            header_rec = line.split('|')
            header_rec.delete_at(col_index+3)
            new_fptr.write(header_rec.join('|') + "\n")
        end

        begin
            while true
                line = fptr.readline.chomp

                if table.encrypted?
                    temp_line = unencrypt_str(line)
                else
                    temp_line = line
                end

                rec = temp_line.split('|', -1)
                rec.delete_at(col_index)

                if table.encrypted?
                    new_fptr.write(encrypt_str(rec.join('|')) + "\n")
                else
                    new_fptr.write(rec.join('|') + "\n")
                end
            end
        # Here's how we break out of the loop...
        rescue EOFError
        end

        # Close the table and release the write lock.
        fptr.close
        new_fptr.close
        File.delete(table.filename)
        FileUtils.mv(table.filename+'temp', table.filename)
    end
end

#drop_index(table, col_names) ⇒ Object

drop_index



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# File 'lib/kirbybase.rb', line 1471

def drop_index(table, col_names)
    with_write_lock(table.name) do
        fptr = open(table.filename, 'r')
        new_fptr = open(table.filename+'temp', 'w')

        line = fptr.readline.chomp

        if line[0..0] == 'Z'
            header_rec = unencrypt_str(line[1..-1]).split('|')
        else
            header_rec = line.split('|')
        end
        
        col_names.each do |c|
            temp_field_def = \
             header_rec[table.field_names.index(c)+3].split(':')
            temp_field_def = temp_field_def.delete_if {|x|
                x =~ /Index->/
            }    
            header_rec[table.field_names.index(c)+3] = \
             temp_field_def.join(':')
        end

        if line[0..0] == 'Z'
            new_fptr.write('Z' + encrypt_str(header_rec.join('|')) +
             "\n")
        else
            new_fptr.write(header_rec.join('|') + "\n")
        end

        begin
            while true
                new_fptr.write(fptr.readline)
            end
        # Here's how we break out of the loop...
        rescue EOFError
        end

        # Close the table and release the write lock.
        fptr.close
        new_fptr.close
        File.delete(table.filename)
        FileUtils.mv(table.filename+'temp', table.filename)
    end
end

#get_header_vars(table) ⇒ Object

get_header_vars



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# File 'lib/kirbybase.rb', line 991

def get_header_vars(table)
    with_table(table) do |fptr|
        encrypted, line = get_header_record(table, fptr)

        last_rec_no, del_ctr, record_class, *flds = line.split('|')
        field_names = flds.collect { |x| x.split(':')[0].to_sym }
        field_types = flds.collect { |x| x.split(':')[1].to_sym }
        field_indexes = [nil] * field_names.size
        field_defaults = [nil] * field_names.size
        field_requireds = [false] * field_names.size
        field_extras = [nil] * field_names.size

        flds.each_with_index do |x,i|
            field_extras[i] = {}
            if x.split(':').size > 2
                x.split(':')[2..-1].each do |y|
                    if y =~ /Index/
                        field_indexes[i] = y
                    elsif y =~ /Default/
                        field_defaults[i] = \
                         convert_to_native_type(field_types[i],
                          y.split('->')[1])
                    elsif y =~ /Required/
                        field_requireds[i] = \
                         convert_to_native_type(:Boolean,
                          y.split('->')[1])
                    else
                        field_extras[i][y.split('->')[0]] = \
                         y.split('->')[1]
                    end
                end
            end
        end
        return [encrypted, last_rec_no.to_i, del_ctr.to_i,
         record_class, field_names, field_types, field_indexes,
         field_defaults, field_requireds, field_extras]
    end
end

#get_index(table, index_name) ⇒ Object

get_index



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# File 'lib/kirbybase.rb', line 902

def get_index(table, index_name)
    return @indexes["#{table.name}_#{index_name}".to_sym].get_idx
end

#get_index_timestamp(table, index_name) ⇒ Object

get_index_timestamp



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# File 'lib/kirbybase.rb', line 909

def get_index_timestamp(table, index_name)
    return @indexes["#{table.name}_#{index_name}".to_sym].get_timestamp
end

#get_rec_by_recno(table, recno) ⇒ Object

get_rec_by_recno



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# File 'lib/kirbybase.rb', line 1093

def get_rec_by_recno(table, recno)
    encrypted = table.encrypted?
    recno_idx = get_recno_index(table)

    return nil unless recno_idx.has_key?(recno)

    with_table(table) do |fptr|
        fptr.seek(recno_idx[recno])
        rec, line_length = line_to_rec(fptr.readline, encrypted)

        raise "Recno Index Corrupt for table %s!" % table.name if \
         rec.empty?

        raise "Recno Index Corrupt for table %s!" % table.name unless \
         rec[0].to_i == recno

        rec << recno_idx[recno] << line_length
        return rec
    end
end

#get_recno_index(table) ⇒ Object

get_recno_index



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# File 'lib/kirbybase.rb', line 822

def get_recno_index(table)
    return @recno_indexes[table.name].get_idx
end

#get_recs(table) ⇒ Object

get_recs



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# File 'lib/kirbybase.rb', line 1033

def get_recs(table)
    encrypted = table.encrypted?
    recs = []

    with_table(table) do |fptr|
        begin
            # Skip header rec.
            fptr.readline

            # Loop through table.
            while true
                # Record current position in table.
                fpos = fptr.tell
                rec, line_length = line_to_rec(fptr.readline, encrypted)

                next if rec.empty?

                rec << fpos << line_length
                recs << rec
            end
        # Here's how we break out of the loop...
        rescue EOFError
        end
        return recs
    end
end

#get_recs_by_recno(table, recnos) ⇒ Object

get_recs_by_recno



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# File 'lib/kirbybase.rb', line 1063

def get_recs_by_recno(table, recnos)
    encrypted = table.encrypted?
    recs = []
    recno_idx = get_recno_index(table)

    with_table(table) do |fptr|
        # Skip header rec.
        fptr.readline

        # Take all the recnos you want to get, add the file positions
        # to them, and sort by file position, so that when we seek 
        # through the physical file we are going in ascending file
        # position order, which should be fastest.
        recnos.collect { |r| [recno_idx[r], r] }.sort.each do |r|
            fptr.seek(r[0])
            rec, line_length = line_to_rec(fptr.readline, encrypted)

            next if rec.empty?

            raise "Index Corrupt!" unless rec[0].to_i == r[1]
            rec << r[0] << line_length
            recs << rec
        end
        return recs
    end
end

#get_total_recs(table) ⇒ Object

get_total_recs



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# File 'lib/kirbybase.rb', line 971

def get_total_recs(table)
    return get_recs(table).size
end

#index_exists?(table, index_fields) ⇒ Boolean

index_exists?



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# File 'lib/kirbybase.rb', line 895

def index_exists?(table, index_fields)
    @indexes.include?("#{table.name}_#{index_fields.join('_')}".to_sym)
end

#init_index(table, index_fields) ⇒ Object

init_index



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# File 'lib/kirbybase.rb', line 829

def init_index(table, index_fields)
    return if index_exists?(table, index_fields)

    with_write_locked_table(table) do |fptr|
        @indexes["#{table.name}_#{index_fields.join('_')}".to_sym] = \
         KBIndex.new(table, index_fields)
        @indexes["#{table.name}_#{index_fields.join('_')}".to_sym
         ].rebuild(fptr)
    end
end

#init_recno_index(table) ⇒ Object

init_recno_index



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# File 'lib/kirbybase.rb', line 780

def init_recno_index(table)
    return if recno_index_exists?(table)

    with_write_locked_table(table) do |fptr|
        @recno_indexes[table.name] = KBRecnoIndex.new(table)
        @recno_indexes[table.name].rebuild(fptr)
    end
end

#insert_record(table, rec) ⇒ Object

insert_record



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# File 'lib/kirbybase.rb', line 1130

def insert_record(table, rec)
    with_write_locked_table(table) do |fptr|
        # Auto-increment the record number field.
        rec_no = incr_rec_no_ctr(table, fptr)

        # Insert the newly created record number value at the beginning
        # of the field values.
        rec[0] = rec_no

        fptr.seek(0, IO::SEEK_END)
        fpos = fptr.tell

        write_record(table, fptr, 'end', rec.join('|'))

        add_to_indexes(table, rec, fpos)

        # Return the record number of the newly created record.
        return rec_no
    end
end

#line_to_rec(line, encrypted) ⇒ Object

line_to_rec



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# File 'lib/kirbybase.rb', line 1117

def line_to_rec(line, encrypted)
    line.chomp!
    line_length = line.length
    line = unencrypt_str(line) if encrypted
    line.strip!

    # Convert line to rec and return rec and line length.
    return line.split('|', -1), line_length
end

#new_table(name, field_defs, encrypt, record_class) ⇒ Object

new_table

++ Create physical file holding table. This table should not be directly called in your application, but only called by #create_table.



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# File 'lib/kirbybase.rb', line 939

def new_table(name, field_defs, encrypt, record_class)
    # Header rec consists of last record no. used, delete count, and
    # all field names/types.  Here, I am inserting the 'recno' field
    # at the beginning of the fields.
    header_rec = ['000000', '000000', record_class, 'recno:Integer',
     field_defs].join('|')

    header_rec = 'Z' + encrypt_str(header_rec) if encrypt

    begin
        fptr = open(File.join(@db.path, name.to_s + @db.ext), 'w')
        fptr.write(header_rec + "\n")
    ensure
        fptr.close
    end
end

#pack_table(table) ⇒ Object

pack_table



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# File 'lib/kirbybase.rb', line 1653

def pack_table(table)
    with_write_lock(table.name) do
        fptr = open(table.filename, 'r')
        new_fptr = open(table.filename+'temp', 'w')

        line = fptr.readline.chomp
        # Reset the delete counter in the header rec to 0.
        if line[0..0] == 'Z'
            header_rec = unencrypt_str(line[1..-1]).split('|')
            header_rec[1] = '000000'
            new_fptr.write('Z' + encrypt_str(header_rec.join('|')) +
             "\n")
        else
            header_rec = line.split('|')
            header_rec[1] = '000000'
            new_fptr.write(header_rec.join('|') + "\n")
        end

        lines_deleted = 0

        begin
            while true
                line = fptr.readline

                if table.encrypted?
                    temp_line = unencrypt_str(line)
                else
                    temp_line = line
                end

                if temp_line.strip == ''
                    lines_deleted += 1
                else
                    new_fptr.write(line)
                end
            end
        # Here's how we break out of the loop...
        rescue EOFError
        end

        # Close the table and release the write lock.
        fptr.close
        new_fptr.close
        File.delete(table.filename)
        FileUtils.mv(table.filename+'temp', table.filename)

        # Return the number of deleted records that were removed.
        return lines_deleted
    end
end

#read_blob_file(filepath) ⇒ Object

read_blob_file



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# File 'lib/kirbybase.rb', line 1731

def read_blob_file(filepath)
    begin
        f = File.new(File.join(@db.memo_blob_path, filepath), 'rb')
        return f.read
    ensure
        f.close
    end
end

#read_memo_file(filepath) ⇒ Object

read_memo_file



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# File 'lib/kirbybase.rb', line 1707

def read_memo_file(filepath)
    begin
        f = File.new(File.join(@db.memo_blob_path, filepath))
        return f.read
    ensure
        f.close
    end
end

#rebuild_index(table, index_fields) ⇒ Object

rebuild_index



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# File 'lib/kirbybase.rb', line 843

def rebuild_index(table, index_fields)
    with_write_locked_table(table) do |fptr|
        @indexes["#{table.name}_#{index_fields.join('_')}".to_sym
         ].rebuild(fptr)
    end
end

#rebuild_recno_index(table) ⇒ Object

rebuild_recno_index



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# File 'lib/kirbybase.rb', line 792

def rebuild_recno_index(table)
    with_write_locked_table(table) do |fptr|
        @recno_indexes[table.name].rebuild(fptr)
    end
end

#recno_index_exists?(table) ⇒ Boolean

recno_index_exists?



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# File 'lib/kirbybase.rb', line 815

def recno_index_exists?(table)
    @recno_indexes.include?(table.name)
end

#remove_indexes(tablename) ⇒ Object

remove_indexes



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# File 'lib/kirbybase.rb', line 853

def remove_indexes(tablename)
    re_table_name = Regexp.new(tablename.to_s)
    @indexes.delete_if { |k,v| k.to_s =~ re_table_name }
end

#remove_recno_index(tablename) ⇒ Object

remove_recno_index



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# File 'lib/kirbybase.rb', line 801

def remove_recno_index(tablename)
    @recno_indexes.delete(tablename)
end

#rename_column(table, old_col_name, new_col_name) ⇒ Object

rename_column



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# File 'lib/kirbybase.rb', line 1252

def rename_column(table, old_col_name, new_col_name)
    col_index = table.field_names.index(old_col_name)
    with_write_lock(table.name) do
        fptr = open(table.filename, 'r')
        new_fptr = open(table.filename+'temp', 'w')

        line = fptr.readline.chomp

        if line[0..0] == 'Z'
            header_rec = unencrypt_str(line[1..-1]).split('|')
        else
            header_rec = line.split('|')
        end
        
        temp_fields = header_rec[col_index+3].split(':')
        temp_fields[0] = new_col_name.to_s
        header_rec[col_index+3] = temp_fields.join(':')

        if line[0..0] == 'Z'
            new_fptr.write('Z' + encrypt_str(header_rec.join('|')) +
             "\n")
        else
            new_fptr.write(header_rec.join('|') + "\n")
        end

        begin
            while true
                new_fptr.write(fptr.readline)
            end
        # Here's how we break out of the loop...
        rescue EOFError
        end

        # Close the table and release the write lock.
        fptr.close
        new_fptr.close
        File.delete(table.filename)
        FileUtils.mv(table.filename+'temp', table.filename)
    end
end

#rename_table(old_tablename, new_tablename) ⇒ Object

rename_table



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# File 'lib/kirbybase.rb', line 1418

def rename_table(old_tablename, new_tablename)
    old_full_path = File.join(@db.path, old_tablename.to_s + @db.ext)
    new_full_path = File.join(@db.path, new_tablename.to_s + @db.ext)
    File.rename(old_full_path, new_full_path)    
end

#reset_recno_ctr(table) ⇒ Object

reset_recno_ctr



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# File 'lib/kirbybase.rb', line 978

def reset_recno_ctr(table)
    with_write_locked_table(table) do |fptr|
        encrypted, header_line = get_header_record(table, fptr)
        last_rec_no, rest_of_line = header_line.split('|', 2)
        write_header_record(table, fptr, 
         ['%06d' % 0, rest_of_line].join('|'))
        return true
    end
end

#table_exists?(tablename) ⇒ Boolean

table_exists?



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# File 'lib/kirbybase.rb', line 916

def table_exists?(tablename)
    return File.exists?(File.join(@db.path, tablename.to_s + @db.ext))
end

#tables ⇒ Object

tables



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# File 'lib/kirbybase.rb', line 923

def tables
    list = []
    Dir.foreach(@db.path) { |filename|
        list << File.basename(filename, '.*').to_sym if \
         File.extname(filename) == @db.ext
    }
    return list
end

#update_recno_index(table, recno, fpos) ⇒ Object

update_recno_index



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# File 'lib/kirbybase.rb', line 808

def update_recno_index(table, recno, fpos)
    @recno_indexes[table.name].update_index_rec(recno, fpos)
end

#update_records(table, recs) ⇒ Object

update_records



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# File 'lib/kirbybase.rb', line 1154

def update_records(table, recs)
    with_write_locked_table(table) do |fptr|
        recs.each do |rec|
            line = rec[:rec].join('|')

            # This doesn't actually 'delete' the line, it just
            # makes it all spaces.  That way, if the updated
            # record is the same or less length than the old
            # record, we can write the record back into the
            # same spot.  If the updated record is greater than
            # the old record, we will leave the now spaced-out
            # line and write the updated record at the end of
            # the file.
            write_record(table, fptr, rec[:fpos],
             ' ' * rec[:line_length])
            if line.length > rec[:line_length]
                fptr.seek(0, IO::SEEK_END)
                new_fpos = fptr.tell
                write_record(table, fptr, 'end', line)
                incr_del_ctr(table, fptr)

                update_recno_index(table, rec[:rec].first, new_fpos)
            else
                write_record(table, fptr, rec[:fpos], line)
            end
            update_to_indexes(table, rec[:rec])
        end
        # Return the number of records updated.
        return recs.size
    end
end

#update_to_indexes(table, rec) ⇒ Object

update_to_indexes



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# File 'lib/kirbybase.rb', line 885

def update_to_indexes(table, rec)
    re_table_name = Regexp.new(table.name.to_s)
    @indexes.each_pair do |key, index|
        index.update_index_rec(rec) if key.to_s =~ re_table_name
    end
end

#write_blob_file(filepath, contents) ⇒ Object

write_blob_file



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# File 'lib/kirbybase.rb', line 1743

def write_blob_file(filepath, contents)
    begin
        f = File.new(File.join(@db.memo_blob_path, filepath), 'wb')
        f.write(contents)
    ensure
        f.close
    end
end

#write_memo_file(filepath, contents) ⇒ Object

write_memo_file



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# File 'lib/kirbybase.rb', line 1719

def write_memo_file(filepath, contents)
    begin
        f = File.new(File.join(@db.memo_blob_path, filepath), 'w')
        f.write(contents)
    ensure
        f.close
    end
end