Class: KnjDB_sqlite3::Tables::Table

Inherits:
Object
  • Object
show all
Defined in:
lib/knj/knjdb/drivers/sqlite3/knjdb_sqlite3_tables.rb

Instance Method Summary collapse

Constructor Details

#initialize(args) ⇒ Table

Returns a new instance of Table.



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# File 'lib/knj/knjdb/drivers/sqlite3/knjdb_sqlite3_tables.rb', line 53

def initialize(args)
  @db = args[:db]
  @driver = args[:driver]
  @data = args[:data]
end

Instance Method Details

#clone(newname) ⇒ Object 



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# File 'lib/knj/knjdb/drivers/sqlite3/knjdb_sqlite3_tables.rb', line 144

def clone(newname)
  raise "Invalid name." if newname.to_s.strip.length <= 0
  cols_cur = self.columns
  
  sql = "CREATE TABLE `#{newname}` ("
  first = true
  cols_cur.each do |name, col|
    sql << ", " if !first
    first = false if first
    sql << @db.cols.data_sql(col.data)
  end
  
  sql << ");"
  @db.query(sql)
  
  sql = "INSERT INTO `#{newname}` SELECT * FROM `#{self.name}`"
  @db.query(sql)
  return @db.tables[newname]
end

#column(name) ⇒ Object

Raises:



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# File 'lib/knj/knjdb/drivers/sqlite3/knjdb_sqlite3_tables.rb', line 72

def column(name)
  list = self.columns
  return list[name] if list[name]
  raise Knj::Errors::NotFound.new("Column not found: #{name}.")
end

#columns ⇒ Object 



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# File 'lib/knj/knjdb/drivers/sqlite3/knjdb_sqlite3_tables.rb', line 78

def columns
  if !@list
    @db.cols
    @list = {}
    
    q_cols = @db.query("PRAGMA table_info(`#{@driver.esc_table(self.name)}`)")
    while d_cols = q_cols.fetch
      @list[d_cols[:name]] = KnjDB_sqlite3::Columns::Column.new(
        :table => self,
        :db => @db,
        :driver => @driver,
        :data => d_cols
      )
    end
  end
  
  return @list
end

#copy(args = {}) ⇒ Object 



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# File 'lib/knj/knjdb/drivers/sqlite3/knjdb_sqlite3_tables.rb', line 164

def copy(args = {})
  temp_name = "temptable_#{Time.now.to_f.to_s.hash}"
  cloned_tabled = self.clone(temp_name)
  cols_cur = self.columns
  @db.query("DROP TABLE `#{self.name}`")
  
  sql = "CREATE TABLE `#{self.name}` ("
  first = true
  cols_cur.each do |name, col|
    next if args["drops"] and args["drops"].index(name) != nil
    
    sql << ", " if !first
    first = false if first
    
    if args.key?("alter_columns") and args["alter_columns"][name.to_s]
      sql << @db.cols.data_sql(args["alter_columns"][name.to_s])
    else
      sql << @db.cols.data_sql(col.data)
    end
    
    if args["new"]
      args["new"].each do |col_data|
        if col_data["after"] and col_data["after"] == name
          sql << ", #{@db.cols.data_sql(col_data)}"
        end
      end
    end
  end
  sql << ");"
  @db.query(sql)
  
  sql = "INSERT INTO `#{self.name}` SELECT "
  first = true
  cols_cur.each do |name, col|
    next if args["drops"] and args["drops"].index(name) != nil
    
    sql << ", " if !first
    first = false if first
    
    sql << "`#{name}`"
    
    if args["news"]
      args["news"].each do |col_data|
        if col_data["after"] and col_data["after"] == name
          sql << ", ''"
        end
      end
    end
  end
  
  sql << " FROM `#{temp_name}`"
  @db.query(sql)
  @db.query("DROP TABLE `#{temp_name}`")
end

#create_column_programmatic(col_data) ⇒ Object 



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# File 'lib/knj/knjdb/drivers/sqlite3/knjdb_sqlite3_tables.rb', line 107

def create_column_programmatic(col_data)
  temp_name = "temptable_#{Time.now.to_f.to_s.hash}"
  cloned_tabled = self.clone(temp_name)
  cols_cur = self.columns
  @db.query("DROP TABLE `#{self.name}`")
  
  sql = "CREATE TABLE `#{self.name}` ("
  first = true
  cols_cur.each do |name, col|
    sql << ", " if !first
    first = false if first
    sql << @db.cols.data_sql(col.data)
    
    if col_data["after"] and col_data["after"] == name
      sql << ", #{@db.cols.data_sql(col_data)}"
    end
  end
  sql << ");"
  @db.query(sql)
  
  sql = "INSERT INTO `#{self.name}` SELECT "
  first = true
  cols_cur.each do |name, col|
    sql << ", " if !first
    first = false if first
    
    sql << "`#{name}`"
    
    if col_data["after"] and col_data["after"] == name
      sql << ", ''"
    end
  end
  sql << " FROM `#{temp_name}`"
  @db.query(sql)
  @db.query("DROP TABLE `#{temp_name}`")
end

#create_columns(col_arr) ⇒ Object 



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# File 'lib/knj/knjdb/drivers/sqlite3/knjdb_sqlite3_tables.rb', line 97

def create_columns(col_arr)
  col_arr.each do |col_data|
    #if col_data.key?("after")
    #  self.create_column_programmatic(col_data)
    #else
      @db.query("ALTER TABLE `#{self.name}` ADD COLUMN #{@db.cols.data_sql(col_data)};")
    #end
  end
end

#create_indexes(index_arr) ⇒ Object 



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# File 'lib/knj/knjdb/drivers/sqlite3/knjdb_sqlite3_tables.rb', line 258

def create_indexes(index_arr)
  index_arr.each do |index_data|
    raise "No name was given." if !index_data.key?("name") or index_data["name"].strip.length <= 0
    raise "No columns was given on index #{index_data["name"]}." if index_data["columns"].empty?
    
    name = index_data["name"]
    name = "#{self.name}__#{name}" if @db.opts[:index_append_table_name]
    
    sql = "CREATE INDEX #{@db.escape_col}#{@db.esc_col(name)}#{@db.escape_col} ON #{@db.escape_table}#{@db.esc_table(self.name)}#{@db.escape_table} ("
    
    first = true
    index_data["columns"].each do |col_name|
      sql << ", " if !first
      first = false if first
      
      sql << "#{@db.escape_col}#{@db.esc_col(col_name)}#{@db.escape_col}"
    end
    
    sql << ")"
    
    @db.query(sql)
    @indexes_list = nil
  end
end

#data ⇒ Object 



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# File 'lib/knj/knjdb/drivers/sqlite3/knjdb_sqlite3_tables.rb', line 283

def data
  ret = {
    "name" => name,
    "columns" => [],
    "indexes" => []
  }
  
  columns.each do |name, column|
    ret["columns"] << column.data
  end
  
  indexes.each do |name, index|
    ret["indexes"] << index.data if name != "PRIMARY"
  end
  
  return ret
end

#drop ⇒ Object 



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# File 'lib/knj/knjdb/drivers/sqlite3/knjdb_sqlite3_tables.rb', line 63

def drop
  sql = "DROP TABLE `#{self.name}`"
  @db.query(sql)
end

#index(name) ⇒ Object

Raises:



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# File 'lib/knj/knjdb/drivers/sqlite3/knjdb_sqlite3_tables.rb', line 219

def index(name)
  list = self.indexes
  return list[name] if list[name]
  raise Knj::Errors::NotFound.new("Index not found: #{name}.")
end

#indexes ⇒ Object 



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# File 'lib/knj/knjdb/drivers/sqlite3/knjdb_sqlite3_tables.rb', line 225

def indexes
  if !@indexes_list
    @db.indexes
    @indexes_list = {}
    
    q_indexes = @db.query("PRAGMA index_list(`#{@driver.esc_table(self.name)}`)")
    while d_indexes = q_indexes.fetch
      if @db.opts[:index_append_table_name]
        match_name = d_indexes[:name].match(/__(.+)$/)
        
        if match_name
          name = match_name[1]
        else
          name = d_indexes[:name]
        end
      else
        name = d_indexes[:name]
      end
      
      @indexes_list[name] = KnjDB_sqlite3::Indexes::Index.new(
        :table => self,
        :db => @db,
        :driver => @driver,
        :data => d_indexes
      )
      
      @indexes_list[name].columns << name
    end
  end
  
  return @indexes_list
end

#name ⇒ Object 



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# File 'lib/knj/knjdb/drivers/sqlite3/knjdb_sqlite3_tables.rb', line 59

def name
  return @data[:name]
end

#optimize ⇒ Object 



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# File 'lib/knj/knjdb/drivers/sqlite3/knjdb_sqlite3_tables.rb', line 68

def optimize
  raise "stub!"
end