87 lines
2.3 KiB
Ruby
87 lines
2.3 KiB
Ruby
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# SPDX-License-Identifier: Apache-2.0
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# Copyright (C) 2021 OKTET Labs Ltd. All rights reserved.
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#
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# SQL class for Diary Management Application
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#
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class SQL_Cache < Hash
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def initialize(sql, table, string_expr)
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@sql = sql
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@name = table
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@string_expr = string_expr
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@lists = Hash.new
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@fields = @sql.columns(@name).collect { |col| col["name"] }
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super(0)
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end
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attr_reader :sql, :name
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attr_accessor :string_expr
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def search(where)
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list = Array.new
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@sql.select_all("select * from #{@name} where #{where} order by id") do |row|
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self[row["id"]] = row.to_h
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list.push(self[row["id"]])
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end
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list
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end
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private :search
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def list(where)
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if not @lists[where]
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@lists[where] = search(where).collect do |entry|
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string = @string_expr.dup
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entry.each do |field, value|
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string.gsub!(/#\{#{field}\}/, value.to_s) if value
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end
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[entry["id"].to_s, string]
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end
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end
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@lists[where]
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end
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def [](id)
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id = id.to_i
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if super(id) == 0
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if search("id = #{id}").length != 1
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self[id] = nil
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end
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end
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super(id)
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end
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def create(data)
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fields = data.keys & @fields
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@sql.do("insert into #{@name} (" +
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fields.join(", ") +
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") values (" + fields.collect do "?" end.join(", ") +
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")",
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*(fields.collect do |field| data[field] end))
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@sql.select_one("select last_insert_id()")[0]
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end
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def modify(id, data)
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fields = (@fields & self[id].keys) - ["id"]
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changes = fields.inject([]) do |ch, field|
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if data.has_key?(field) and data[field] != self[id][field]
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ch.push(field)
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else
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ch
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end
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end
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@sql.do("update #{@name} set " +
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changes.collect do |field|
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field + " = ?"
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end.join(", ") + " where id = #{id}",
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*(changes.collect do |field| data[field] end)
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) if changes.length > 0
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end
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def delete(id)
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@sql.do("delete from #{@name} where id = #{id}")
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super(id)
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end
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end
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